diff --git a/litellm/anthropic_beta_headers_manager.py b/litellm/anthropic_beta_headers_manager.py
index 96c38b69104..d57cbd6d8f5 100644
--- a/litellm/anthropic_beta_headers_manager.py
+++ b/litellm/anthropic_beta_headers_manager.py
@@ -354,6 +354,7 @@ def get_provider_beta_header(
 def update_headers_with_filtered_beta(
     headers: dict,
     provider: str,
+    keep: frozenset[str] = frozenset(),
 ) -> dict:
     """
     Update headers dict by filtering and transforming anthropic-beta header values.
@@ -362,6 +363,7 @@ def update_headers_with_filtered_beta(
     Args:
         headers: Request headers dict (will be modified in place)
         provider: Provider name
+        keep: Betas the routed model accepts, forwarded as sent whatever the row says
 
     Returns:
         Updated headers dict
@@ -371,12 +373,19 @@ def update_headers_with_filtered_beta(
         return headers
 
     # Parse existing beta headers
-    beta_values: Final = [b.strip() for b in existing_beta.split(",") if b.strip()]
+    beta_values: Final[tuple[str, ...]] = tuple(b.strip() for b in existing_beta.split(",") if b.strip())
 
     # Filter and transform based on provider
-    filtered_beta_values: Final = filter_and_transform_beta_headers(
-        beta_headers=beta_values,
-        provider=provider,
+    filtered_beta_values: Final = tuple(
+        dict.fromkeys(
+            [
+                *filter_and_transform_beta_headers(
+                    beta_headers=[b for b in beta_values if b not in keep],
+                    provider=provider,
+                ),
+                *(b for b in beta_values if b in keep),
+            ]
+        )
     )
 
     # Update or remove the header
diff --git a/litellm/completion_extras/litellm_responses_transformation/transformation.py b/litellm/completion_extras/litellm_responses_transformation/transformation.py
index 8d23526b41a..822ef1ea0be 100644
--- a/litellm/completion_extras/litellm_responses_transformation/transformation.py
+++ b/litellm/completion_extras/litellm_responses_transformation/transformation.py
@@ -1066,11 +1066,12 @@ class LiteLLMResponsesTransformationHandler(CompletionTransformationBridge):
             replay_tool_search=_requests_tool_search(cast(object, optional_params)),  # cast-ok: upcast
             include_namespace=True,
         )
-        # OpenAI's Responses API rejects an empty input. For a system-only
-        # request, carry the system message as a system-role input item instead
-        # of instructions, mirroring how non-string system content is already
-        # handled in convert_chat_completion_messages_to_responses_api.
-        is_system_only_request: Final = not converted_input_items and converted_instructions is not None
+        # Keep the system text in input instead of instructions when the Responses API needs it there.
+        # It rejects an empty input, and json_object requires the word "json" in input, ignoring instructions.
+        typed_optional_params: Final = cast("Mapping[str, object]", optional_params)  # cast-ok: untyped dict
+        system_goes_in_input: Final = converted_instructions is not None and (
+            not converted_input_items or _payload_type(typed_optional_params.get("response_format")) == "json_object"
+        )
         target_input_items: Final = (
             _without_audio_input_parts(converted_input_items)
             if _drops_audio_input(model, litellm_params)
@@ -1082,12 +1083,13 @@ class LiteLLMResponsesTransformationHandler(CompletionTransformationBridge):
                     "type": "message",
                     "role": "system",
                     "content": [{"type": "input_text", "text": converted_instructions}],
-                }
+                },
+                *target_input_items,
             ]
-            if is_system_only_request
+            if system_goes_in_input
             else target_input_items
         )
-        instructions: Final = None if is_system_only_request else converted_instructions
+        instructions: Final = None if system_goes_in_input else converted_instructions
 
         # Build responses API request using the reverse transformation logic
         responses_api_request: Final = ResponsesAPIOptionalRequestParams()
diff --git a/litellm/integrations/custom_logger.py b/litellm/integrations/custom_logger.py
index 5addc994df2..9332137e3b1 100644
--- a/litellm/integrations/custom_logger.py
+++ b/litellm/integrations/custom_logger.py
@@ -898,6 +898,11 @@ class CustomLogger:  # https://docs.litellm.ai/docs/observability/custom_callbac
     def redacts_messages_itself(self) -> bool:
         return False
 
+    def exempt_from_message_redaction(self) -> bool:
+        """Router pre-call checks that key routing off the request and never log it return True, so
+        `turn_off_message_logging` leaves the success event they receive unredacted."""
+        return False
+
     def redact_standard_logging_payload_from_model_call_details(self, model_call_details: dict) -> dict:
         """
         Redacts or excludes fields from StandardLoggingPayload before callbacks receive it.
diff --git a/litellm/litellm_core_utils/core_helpers.py b/litellm/litellm_core_utils/core_helpers.py
index e706bcadef8..eae9f476863 100644
--- a/litellm/litellm_core_utils/core_helpers.py
+++ b/litellm/litellm_core_utils/core_helpers.py
@@ -10,6 +10,7 @@ from typing import TYPE_CHECKING, Any, Final, Literal, Protocol, cast, runtime_c
 import httpx
 from pydantic import TypeAdapter, ValidationError
 
+import litellm
 from litellm._logging import verbose_logger
 from litellm.litellm_core_utils.llm_response_utils.get_headers import get_provider_request_id
 from litellm.types.llms.openai import AllMessageValues, OpenAIChatCompletionFinishReason
@@ -92,6 +93,10 @@ def normalize_drop_params(value: object) -> bool | None:
         return None
 
 
+def drops_unsupported_params(drop_params: object) -> bool:
+    return litellm.drop_params is True or normalize_drop_params(drop_params) is True
+
+
 def drop_params_flag(value: object, source: str, logger: logging.Logger) -> bool:
     normalized: Final = normalize_drop_params(value)
     if normalized is None and value is not None:
diff --git a/litellm/litellm_core_utils/litellm_logging.py b/litellm/litellm_core_utils/litellm_logging.py
index 1d6250fc528..95323c2ef5e 100644
--- a/litellm/litellm_core_utils/litellm_logging.py
+++ b/litellm/litellm_core_utils/litellm_logging.py
@@ -3751,7 +3751,11 @@ class Logging(LiteLLMLoggingBaseClass):
                 if isinstance(callback, CustomLogger):  # custom logger class
                     from litellm.integrations.shadow_eval_logger import ShadowEvalLogger
 
-                    model_call_details: dict = self.model_call_details
+                    model_call_details: dict = (
+                        self._model_call_details_with_request_messages()
+                        if callback.exempt_from_message_redaction()
+                        else self.model_call_details
+                    )
                     ##################################
                     # call redaction hook for custom logger
                     model_call_details = callback.redact_standard_logging_payload_from_model_call_details(
@@ -4289,6 +4293,21 @@ class Logging(LiteLLMLoggingBaseClass):
     ) -> None:
         executor.submit(self.success_handler, result, start_time, end_time, cache_hit)
 
+    def _model_call_details_with_request_messages(self) -> dict[str, object]:  # mutable-ok: loggers take a dict
+        """The success-event payload with the request messages put back where `turn_off_message_logging`
+        redacted them in place, for a callback that routes on the request and never logs it."""
+        request_messages: Final = cast(object, self.messages)  # cast-ok: the request messages are only put back as-is
+        standard_logging_object: Final = self.model_call_details.get("standard_logging_object")
+        return {
+            **self.model_call_details,
+            "messages": request_messages,
+            **(
+                {"standard_logging_object": {**standard_logging_object, "messages": request_messages}}
+                if isinstance(standard_logging_object, dict)
+                else {}
+            ),
+        }
+
     def _should_run_sync_callbacks_for_async_calls(self) -> bool:
         """
         Returns:
diff --git a/litellm/litellm_core_utils/llm_response_utils/convert_dict_to_response.py b/litellm/litellm_core_utils/llm_response_utils/convert_dict_to_response.py
index 8b94c34942c..3d2b5c65dff 100644
--- a/litellm/litellm_core_utils/llm_response_utils/convert_dict_to_response.py
+++ b/litellm/litellm_core_utils/llm_response_utils/convert_dict_to_response.py
@@ -995,9 +995,10 @@ def convert_to_model_response_object(
         if isinstance(e, APIError):
             raise
 
+        hide_reply: Final = response_type == "audio_transcription"
         received_args: Final = dict(
-            response_object=response_object,
-            model_response_object=model_response_object,
+            response_object="<hidden>" if hide_reply else response_object,
+            model_response_object="<hidden>" if hide_reply else model_response_object,
             response_type=response_type,
             stream=stream,
             start_time=start_time,
diff --git a/litellm/litellm_core_utils/prompt_templates/factory.py b/litellm/litellm_core_utils/prompt_templates/factory.py
index 6e9dd277558..7b3885eac6e 100644
--- a/litellm/litellm_core_utils/prompt_templates/factory.py
+++ b/litellm/litellm_core_utils/prompt_templates/factory.py
@@ -29,6 +29,7 @@ from litellm.litellm_core_utils.prompt_templates.mid_conversation_system import
     place_mid_conversation_system,
     split_leading_system_run,
 )
+from litellm.litellm_core_utils.tool_fields import tools_without_hosted_mcp
 from litellm.litellm_core_utils.url_utils import async_safe_get, safe_get
 from litellm.llms.custom_httpx.http_handler import HTTPHandler, get_async_httpx_client, header_value
 from litellm.types.files import get_file_extension_from_mime_type
@@ -5538,8 +5539,13 @@ def function_call_prompt(
     llm_provider: str,
     drop_params: bool,
 ) -> list[dict[str, object]]:
+    prompt_functions: Final = tools_without_hosted_mcp(
+        functions, model=model, route=llm_provider, drop_params=drop_params
+    )
+    if not prompt_functions:
+        return messages
     header: Final = """To call a function, reply with JSON ONLY in this format {"name": "function_name", "arguments":{"argument_name": "argument_value"}}. Once a function result answers the request, reply to the user in plain text instead of calling a function again. The following functions are available to you:"""
-    function_prompt: Final = header + "".join(f"\n{function}\n" for function in functions)
+    function_prompt: Final = header + "".join(f"\n{function}\n" for function in prompt_functions)
     if not any(_is_system_message(message) for message in messages):
         return [*messages, {"role": "system", "content": function_prompt}]
     return [
diff --git a/litellm/litellm_core_utils/tool_fields.py b/litellm/litellm_core_utils/tool_fields.py
index f90c8f5d174..5ee96ea9133 100644
--- a/litellm/litellm_core_utils/tool_fields.py
+++ b/litellm/litellm_core_utils/tool_fields.py
@@ -1,13 +1,16 @@
-from collections.abc import Callable, Mapping
+from collections.abc import Callable, Mapping, Sequence
+from copy import copy
 from dataclasses import dataclass
 from functools import reduce
-from typing import Annotated, Final, TypeAlias
+from typing import Annotated, Final, TypeAlias, TypeVar
 
 from pydantic import BeforeValidator, ConfigDict, Json, TypeAdapter, ValidationError
 from typing_extensions import ReadOnly, TypedDict
 
 import litellm
-from litellm.litellm_core_utils.core_helpers import normalize_drop_params
+from litellm._logging import verbose_logger
+from litellm.exceptions import UnsupportedParamsError
+from litellm.litellm_core_utils.core_helpers import drops_unsupported_params, normalize_drop_params
 
 ROUTES_WITH_TOOLS: Final = frozenset(
     {
@@ -162,3 +165,145 @@ def resolve_deployment_tool_fields(
     if "proxy_server_request" not in kwargs or route not in ROUTES_WITH_TOOLS:
         return kwargs
     return resolve_tool_fields(kwargs, lambda: (drop_policy(kwargs),))
+
+
+_ToolT: Final = TypeVar("_ToolT")
+
+HOSTED_MCP_DROP_WARNING: Final = (
+    "Dropping the hosted MCP tool(s) %s for model=%s on %s (drop_params=True) because this route cannot run a "
+    "hosted MCP tool."
+)
+
+
+def _hosted_mcp_server_label(tool: object) -> str | None:
+    match tool:
+        case {"type": "mcp", "server_label": str() as server_label}:
+            return server_label
+        case {"type": "mcp"}:
+            return "unlabeled"
+        case _:
+            return None
+
+
+def _drop_params_hint(dropped: str) -> str:
+    return (
+        f"To drop {dropped} instead, set `litellm.drop_params=True` or for proxy:\n\n"
+        "`litellm_settings:\n drop_params: true`\n"
+    )
+
+
+def _one_log_line(text: str) -> str:
+    return text.replace("\r", "").replace("\n", "")
+
+
+def _unrunnable_mcp_error(message: str, model: str, route: str) -> UnsupportedParamsError:
+    return UnsupportedParamsError(message=message, model=model, llm_provider=route, status_code=400)
+
+
+def tools_without_hosted_mcp(tools: Sequence[_ToolT], model: str, route: str, drop_params: bool) -> Sequence[_ToolT]:
+    server_labels: Final = tuple(label for label in map(_hosted_mcp_server_label, tools) if label is not None)
+    if not server_labels:
+        return tools
+    named_servers: Final = ", ".join(f"`{label}`" for label in server_labels)
+    if not drops_unsupported_params(drop_params):
+        raise _unrunnable_mcp_error(
+            f'{model} on {route} cannot run the hosted MCP tool {named_servers} (`type: "mcp"`). To have LiteLLM '
+            "run the MCP server for this model, register it on the LiteLLM MCP gateway and send "
+            '`server_url: "litellm_proxy/mcp/<server name>"`. ' + _drop_params_hint("hosted MCP tools"),
+            model=model,
+            route=route,
+        )
+    verbose_logger.warning(
+        HOSTED_MCP_DROP_WARNING, _one_log_line(named_servers), _one_log_line(model), _one_log_line(route)
+    )
+    return [tool for tool in tools if _hosted_mcp_server_label(tool) is None]
+
+
+MCP_SERVERS_DROP_WARNING: Final = (
+    "Dropping mcp_servers %s and their mcp_toolset tools for model=%s on %s (drop_params=True) because LiteLLM "
+    "cannot pass mcp_servers to this route."
+)
+
+ROUTES_WITHOUT_MCP_SERVERS: Final = frozenset(
+    {"bedrock", "databricks", "deepseek", "gemini", "gigachat", "ollama", "ollama_chat", "vertex_ai", "vertex_ai_beta"}
+)
+
+
+def _mcp_server_name(server: object) -> str:
+    match server:
+        case {"name": str() as name}:
+            return name
+        case _:
+            return "unnamed"
+
+
+def _mcp_server_names(mcp_servers: object) -> tuple[str, ...]:
+    if not mcp_servers:
+        return ()
+    if not isinstance(mcp_servers, list):
+        return ("unnamed",)
+    return tuple(map(_mcp_server_name, _TOOLS.validate_python(mcp_servers)))
+
+
+def _is_mcp_toolset(tool: object) -> bool:
+    match tool:
+        case {"type": "mcp_toolset"}:
+            return True
+        case _:
+            return False
+
+
+def drops_mcp_servers(request_kwargs: Mapping[str, object]) -> bool:
+    additional_drop_params: Final = request_kwargs.get("additional_drop_params")
+    return drops_unsupported_params(request_kwargs.get("drop_params")) or (
+        isinstance(additional_drop_params, list) and "mcp_servers" in additional_drop_params
+    )
+
+
+def tools_without_mcp_servers(
+    mcp_servers: object, tools: Sequence[_ToolT], model: str, route: str, drop_params: bool
+) -> Sequence[_ToolT]:
+    server_names: Final = _mcp_server_names(mcp_servers)
+    if not server_names:
+        return tools
+    named_servers: Final = ", ".join(f"`{name}`" for name in server_names)
+    if not drops_unsupported_params(drop_params):
+        raise _unrunnable_mcp_error(
+            f"LiteLLM cannot pass `mcp_servers` to {model} on {route}, so the MCP server {named_servers} would not "
+            'run. To have LiteLLM run it for this model, register it on the LiteLLM MCP gateway and send a `type: "mcp"` '
+            'tool with `server_url: "litellm_proxy/mcp/<server name>"`. ' + _drop_params_hint("`mcp_servers`"),
+            model=model,
+            route=route,
+        )
+    verbose_logger.warning(
+        MCP_SERVERS_DROP_WARNING, _one_log_line(named_servers), _one_log_line(model), _one_log_line(route)
+    )
+    return [tool for tool in tools if not _is_mcp_toolset(tool)]
+
+
+_TOOL_SELECTION_PARAMS: Final = frozenset({"tools", "tool_choice", "parallel_tool_calls"})
+_ParamsT: Final = TypeVar("_ParamsT", bound=dict[str, object])
+
+
+def tool_params_without_hosted_mcp(
+    params: _ParamsT, model: str, route: str, drop_params: bool, runs_hosted_mcp: Callable[[], bool] | None = None
+) -> _ParamsT:
+    tools: Final = params.get("tools")
+    if not isinstance(tools, list) or not tools:
+        return params
+    sent_tools: Final = _TOOLS.validate_python(tools)
+    if all(_hosted_mcp_server_label(tool) is None for tool in sent_tools) or (
+        runs_hosted_mcp is not None and runs_hosted_mcp()
+    ):
+        return params
+    kept_tools: Final = tools_without_hosted_mcp(tools=sent_tools, model=model, route=route, drop_params=drop_params)
+    if len(kept_tools) == len(sent_tools):
+        return params
+    kept_params: Final = copy(params)
+    if kept_tools:
+        kept_params["tools"] = list(kept_tools)
+        return kept_params
+    dropped_keys: Final = ("tools",) if params.get("functions") else _TOOL_SELECTION_PARAMS
+    for key in dropped_keys:
+        _ = kept_params.pop(key, None)
+    return kept_params
diff --git a/litellm/llms/anthropic/chat/transformation.py b/litellm/llms/anthropic/chat/transformation.py
index 85951566869..ab23a8b6877 100644
--- a/litellm/llms/anthropic/chat/transformation.py
+++ b/litellm/llms/anthropic/chat/transformation.py
@@ -11,6 +11,7 @@ from pydantic import BaseModel, ConfigDict, TypeAdapter, ValidationError
 from typing_extensions import ReadOnly, TypedDict
 
 import litellm
+from litellm.anthropic_beta_headers_manager import get_unsupported_headers
 from litellm.constants import (
     ANTHROPIC_MIN_THINKING_BUDGET_TOKENS,
     ANTHROPIC_WEB_SEARCH_TOOL_MAX_USES,
@@ -47,6 +48,7 @@ from litellm.litellm_core_utils.prompt_templates.mid_conversation_system import
     place_mid_conversation_system,
     split_leading_system_run,
 )
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.llms.base_llm.base_utils import (
     ResponseFormatSchema,
     as_json_object,
@@ -1229,6 +1231,11 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
             *(tool for tool in tools[first_search_tool_index + 1 :] if not _is_openai_tool_search_tool(tool)),
         ]
 
+    def runs_hosted_mcp(self) -> bool:
+        return ANTHROPIC_BETA_HEADER_VALUES.MCP_CLIENT_2025_04_04.value not in get_unsupported_headers(
+            self._resolved_provider
+        )
+
     def _tools_param_with_openai_tool_search_mapped(
         self, non_default_params: Mapping[str, object], model: str, drop_params: bool
     ) -> Mapping[str, object]:
@@ -1813,7 +1820,14 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
         model: str,
         drop_params: bool,
     ) -> dict:
-        is_thinking_enabled: Final = self.is_thinking_enabled(non_default_params=non_default_params)
+        request_params: Final = tool_params_without_hosted_mcp(
+            non_default_params,
+            model=model,
+            route=self._resolved_provider,
+            drop_params=drop_params,
+            runs_hosted_mcp=self.runs_hosted_mcp,
+        )
+        is_thinking_enabled: Final = self.is_thinking_enabled(non_default_params=request_params)
 
         # NB: ``map_openai_params`` deliberately does NOT sanitize tool names
         # here. Names are the *original* OpenAI names at this stage, and must
@@ -1826,7 +1840,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
         #      via ``data = {**optional_params}`` and would 400 with
         #      ``Extra inputs are not permitted``).
 
-        for param, value in non_default_params.items():
+        for param, value in request_params.items():
             if param == "max_tokens" or param == "max_completion_tokens":
                 optional_params["max_tokens"] = value if isinstance(value, int) else max(1, int(round(value)))
             elif param == "tools":
@@ -1840,8 +1854,8 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                     optional_params["mcp_servers"] = mcp_servers
             elif param == "tool_choice" or param == "parallel_tool_calls":
                 _tool_choice: AnthropicMessagesToolChoice | None = self._map_tool_choice(
-                    tool_choice=non_default_params.get("tool_choice"),
-                    parallel_tool_use=non_default_params.get("parallel_tool_calls"),
+                    tool_choice=request_params.get("tool_choice"),
+                    parallel_tool_use=request_params.get("parallel_tool_calls"),
                 )
 
                 if _tool_choice is not None:
@@ -1903,7 +1917,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                     # `thinking={type: enabled, budget_tokens}` interface a
                     # pre-4.6 model actually supports instead of forwarding a
                     # shape the model will reject.
-                    max_tokens = non_default_params.get("max_completion_tokens") or non_default_params.get("max_tokens")
+                    max_tokens = request_params.get("max_completion_tokens") or request_params.get("max_tokens")
                     legacy_thinking = AnthropicConfig._map_reasoning_effort(
                         reasoning_effort="medium",
                         model=model,
@@ -1996,7 +2010,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
 
         ## handle thinking tokens
         self.update_optional_params_with_thinking_tokens(
-            non_default_params=non_default_params, optional_params=optional_params
+            non_default_params=request_params, optional_params=optional_params
         )
 
         return optional_params
diff --git a/litellm/llms/anthropic/pass_through/adapters/handler.py b/litellm/llms/anthropic/pass_through/adapters/handler.py
index 7b8c2550838..8c0c065c457 100644
--- a/litellm/llms/anthropic/pass_through/adapters/handler.py
+++ b/litellm/llms/anthropic/pass_through/adapters/handler.py
@@ -14,6 +14,11 @@ import litellm
 from litellm._logging import verbose_logger
 from litellm.litellm_core_utils.asyncify import run_async_function
 from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLoggingObject
+from litellm.litellm_core_utils.tool_fields import (
+    ROUTES_WITHOUT_MCP_SERVERS,
+    drops_mcp_servers,
+    tools_without_mcp_servers,
+)
 from litellm.llms.anthropic.pass_through.adapters.transformation import (
     AnthropicAdapter,
 )
@@ -588,6 +593,22 @@ class LiteLLMMessagesToCompletionTransformationHandler:
             Logging as LiteLLMLoggingObject,
         )
 
+        provider_kwargs: Final = extra_kwargs or {}
+        custom_llm_provider: Final = provider_kwargs.get("custom_llm_provider")
+        target_provider: Final = custom_llm_provider if isinstance(custom_llm_provider, str) else None
+        strips_mcp_servers: Final = target_provider in ROUTES_WITHOUT_MCP_SERVERS
+        request_tools: Final = (
+            tools_without_mcp_servers(
+                provider_kwargs.get("mcp_servers"),
+                tools or (),
+                model=model,
+                route=target_provider,
+                drop_params=drops_mcp_servers(provider_kwargs),
+            )
+            if strips_mcp_servers
+            else tools
+        )
+
         request_data: Final[dict[str, object]] = {
             "model": model,
             "messages": messages,
@@ -604,10 +625,10 @@ class LiteLLMMessagesToCompletionTransformationHandler:
             request_data["temperature"] = temperature
         if thinking:
             request_data["thinking"] = thinking
-        if tool_choice:
+        if tool_choice and (request_tools or not tools):
             request_data["tool_choice"] = tool_choice
-        if tools:
-            request_data["tools"] = tools
+        if request_tools:
+            request_data["tools"] = request_tools
         if top_k is not None:
             request_data["top_k"] = top_k
         if top_p is not None:
@@ -625,13 +646,12 @@ class LiteLLMMessagesToCompletionTransformationHandler:
         if "output_config" in extra_kwargs:
             request_data["output_config"] = extra_kwargs["output_config"]
 
-        custom_llm_provider: Final = extra_kwargs.get("custom_llm_provider")
         (
             openai_request,
             tool_name_mapping,
         ) = ANTHROPIC_ADAPTER.translate_completion_input_params_with_tool_mapping(
             request_data,
-            custom_llm_provider=custom_llm_provider if isinstance(custom_llm_provider, str) else None,
+            custom_llm_provider=target_provider,
         )
 
         if openai_request is None:
@@ -659,7 +679,11 @@ class LiteLLMMessagesToCompletionTransformationHandler:
         # Maintainability: when adding a new Anthropic-only request param to
         # ``AnthropicMessagesRequestOptionalParams``, also extend
         # ``ANTHROPIC_ONLY_REQUEST_KEYS`` here so it doesn't silently leak.
-        excluded_keys: Final = ANTHROPIC_ONLY_REQUEST_KEYS | CONVERTED_STREAM_KEYS | {"anthropic_messages"}
+        excluded_keys: Final = (
+            ANTHROPIC_ONLY_REQUEST_KEYS
+            | CONVERTED_STREAM_KEYS
+            | ({"anthropic_messages", "mcp_servers"} if strips_mcp_servers else {"anthropic_messages"})
+        )
         # NOTE: extra_kwargs was already coerced from None to {} at the top of
         # this method (line ~220). It is guaranteed to be a dict here.
         for key, value in extra_kwargs.items():
diff --git a/litellm/llms/anthropic/pass_through/responses_adapters/handler.py b/litellm/llms/anthropic/pass_through/responses_adapters/handler.py
index 692e5d4c175..3eeaee8ad43 100644
--- a/litellm/llms/anthropic/pass_through/responses_adapters/handler.py
+++ b/litellm/llms/anthropic/pass_through/responses_adapters/handler.py
@@ -16,6 +16,7 @@ from litellm.integrations.anthropic_cache_control_hook import (
 )
 from litellm.litellm_core_utils.core_helpers import normalize_drop_params
 from litellm.litellm_core_utils.prompt_templates.common_utils import cache_control_as_prompt_cache_breakpoint
+from litellm.litellm_core_utils.tool_fields import drops_mcp_servers, tools_without_mcp_servers
 from litellm.types.integrations.custom_logger import CONVERTED_STREAM_KEYS
 from litellm.types.llms.anthropic import (
     AllAnthropicMessageValues,
@@ -141,6 +142,14 @@ def _build_responses_kwargs(
     Build the kwargs dict to pass directly to litellm.responses() / litellm.aresponses().
     """
     forwarded_kwargs: Final = _forwarded_kwargs(extra_kwargs)
+    target_provider: Final = forwarded_kwargs.get("custom_llm_provider")
+    request_tools: Final = tools_without_mcp_servers(
+        forwarded_kwargs.get("mcp_servers"),
+        tools or (),
+        model=model,
+        route=target_provider if isinstance(target_provider, str) else "this route",
+        drop_params=drops_mcp_servers(forwarded_kwargs),
+    )
     block_rewrite: Final = _prompt_cache_block_rewrite(model, forwarded_kwargs)
     request_messages: Final[AnthropicRequestMessages] = (
         [
@@ -173,10 +182,10 @@ def _build_responses_kwargs(
         request_data["temperature"] = temperature
     if thinking:
         request_data["thinking"] = thinking
-    if tool_choice:
+    if tool_choice and (request_tools or not tools):
         request_data["tool_choice"] = tool_choice
-    if tools:
-        request_data["tools"] = tools
+    if request_tools:
+        request_data["tools"] = list(request_tools)
     if top_p is not None:
         request_data["top_p"] = top_p
     if output_format:
@@ -213,7 +222,7 @@ def _build_responses_kwargs(
         responses_kwargs["stream"] = True
 
     # Forward litellm-specific kwargs (api_key, api_base, logging obj, etc.)
-    excluded: Final = CONVERTED_STREAM_KEYS | {"anthropic_messages"}
+    excluded: Final = CONVERTED_STREAM_KEYS | {"anthropic_messages", "mcp_servers"}
     for key, value in forwarded_kwargs.items():
         if key == "litellm_logging_obj" and value is not None:
             from litellm.litellm_core_utils.litellm_logging import (
diff --git a/litellm/llms/base_llm/anthropic_messages/transformation.py b/litellm/llms/base_llm/anthropic_messages/transformation.py
index 06717207dc0..db39e135aca 100644
--- a/litellm/llms/base_llm/anthropic_messages/transformation.py
+++ b/litellm/llms/base_llm/anthropic_messages/transformation.py
@@ -138,6 +138,9 @@ class BaseAnthropicMessagesConfig(ABC):
         """
         return True
 
+    def model_specific_anthropic_betas(self, model: str, litellm_params: GenericLiteLLMParams) -> frozenset[str]:
+        return frozenset()
+
     def handles_web_search_natively(self) -> bool:
         """
         Whether the upstream this config routes to executes ``web_search`` tools
diff --git a/litellm/llms/bedrock/chat/converse_transformation.py b/litellm/llms/bedrock/chat/converse_transformation.py
index 606975723d4..68e786101fe 100644
--- a/litellm/llms/bedrock/chat/converse_transformation.py
+++ b/litellm/llms/bedrock/chat/converse_transformation.py
@@ -46,6 +46,7 @@ from litellm.litellm_core_utils.prompt_templates.mid_conversation_system import
     message_field,
     parts_of,
 )
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.llms.anthropic.chat.transformation import (
     DROP_UNSUPPORTED_ADAPTIVE_THINKING_WARNING,
     DROP_UNSUPPORTED_OUTPUT_CONFIG_WARNING,
@@ -170,6 +171,10 @@ def _tools_the_model_accepts(
     return [tool_with_sanitized_parameters(tool, drop_lookaround_regex_patterns) for tool in tools]
 
 
+BEDROCK_SERVICE_TIERS: Final = ("default", "flex", "priority", "reserved")
+_BEDROCK_SERVICE_TIER_ALIASES: Final = types.MappingProxyType({"standard_only": "default"})
+
+
 _OUTPUT_CONFIG_BLOCK: Final = TypeAdapter(OutputConfigBlock)
 
 
@@ -1107,20 +1112,23 @@ class AmazonConverseConfig(BaseConfig):
         drop_params: bool,
         model_info: Mapping[str, object] | None = None,
     ) -> dict:
-        is_thinking_enabled: Final = self.is_thinking_enabled(non_default_params)
+        request_params: Final = tool_params_without_hosted_mcp(
+            non_default_params, model=model, route="bedrock", drop_params=drop_params
+        )
+        is_thinking_enabled: Final = self.is_thinking_enabled(request_params)
         base_model: Final = BedrockModelInfo.get_base_model(model)
         drop_thinking_param: Final = self._is_deepseek_model(model=model, base_model=base_model)
         drop_reasoning_effort_param: Final = self._model_rejects_reasoning_effort_param(
             model=model, base_model=base_model
         )
 
-        for param, value in non_default_params.items():
+        for param, value in request_params.items():
             if param == "response_format" and isinstance(value, dict):
                 optional_params = self._translate_response_format_param(
                     value=value,
                     model=model,
                     optional_params=optional_params,
-                    non_default_params=non_default_params,
+                    non_default_params=request_params,
                     is_thinking_enabled=is_thinking_enabled,
                     model_info=model_info,
                 )
@@ -1174,7 +1182,7 @@ class AmazonConverseConfig(BaseConfig):
                         ),
                     ),
                     model=model,
-                    non_default_params=non_default_params,
+                    non_default_params=request_params,
                     optional_params=optional_params,
                 )
             if param == "tool_choice":
@@ -1200,7 +1208,7 @@ class AmazonConverseConfig(BaseConfig):
                     and value.get("type") == "adaptive"
                     and not AnthropicConfig.is_adaptive_thinking_model(model, "bedrock")
                 ):
-                    max_tokens = non_default_params.get("max_completion_tokens") or non_default_params.get("max_tokens")
+                    max_tokens = request_params.get("max_completion_tokens") or request_params.get("max_tokens")
                     legacy_thinking = AnthropicConfig.map_reasoning_effort(
                         reasoning_effort="medium",
                         model=model,
@@ -1261,8 +1269,8 @@ class AmazonConverseConfig(BaseConfig):
                 self._map_context_management_param(value, optional_params)
             if param == "requestMetadata":
                 self._map_request_metadata_param(value, optional_params)
-            if param == "service_tier" and isinstance(value, str):
-                self._map_service_tier_param(value, optional_params)
+            if param == "service_tier":
+                self._map_service_tier_param(_JSON_VALUE.validate_python(value), optional_params, model, drop_params)
 
             if param == "web_search_options" and isinstance(value, dict):
                 # Note: we use `isinstance(value, dict)` instead of `value and isinstance(value, dict)`
@@ -1277,7 +1285,7 @@ class AmazonConverseConfig(BaseConfig):
         # Nova 2 handles token budgeting differently through reasoningConfig
         if "gpt-oss" not in model and not self._is_nova_2_model(model):
             self.update_optional_params_with_thinking_tokens(
-                non_default_params=non_default_params, optional_params=optional_params
+                non_default_params=request_params, optional_params=optional_params
             )
 
         final_is_thinking_enabled: Final = self.is_thinking_enabled(optional_params)
@@ -1315,17 +1323,22 @@ class AmazonConverseConfig(BaseConfig):
         if mapped is not None:
             optional_params["context_management"] = mapped
 
-    def _map_service_tier_param(self, value: str, optional_params: dict) -> None:
-        """Map OpenAI service_tier (string) to Bedrock serviceTier (object).
-
-        OpenAI values: "auto", "default", "flex", "priority"
-        Bedrock values: "default", "flex", "priority" (no "auto")
-        """
-        bedrock_tier = value
-        if value == "auto":
-            bedrock_tier = "default"  # Bedrock doesn't support "auto"
-        if bedrock_tier in ("default", "flex", "priority"):
+    def _map_service_tier_param(self, value: object, optional_params: dict, model: str, drop_params: bool) -> None:
+        if value is None or value == "auto":
+            return
+        bedrock_tier: Final = _BEDROCK_SERVICE_TIER_ALIASES.get(value, value) if isinstance(value, str) else None
+        if bedrock_tier in BEDROCK_SERVICE_TIERS:
             optional_params["serviceTier"] = {"type": bedrock_tier}
+            return
+        if not (litellm.drop_params or drop_params):
+            raise litellm.utils.UnsupportedParamsError(
+                message=(
+                    f"{model} does not support service_tier={value!r} on Bedrock. "
+                    "To drop unsupported params, set `litellm.drop_params = True`."
+                ),
+                status_code=400,
+            )
+        verbose_logger.warning("Dropping service_tier=%r for %s, since Bedrock does not serve it.", value, model)
 
     def _translate_response_format_param(
         self,
diff --git a/litellm/llms/bedrock/claude_platform/transformation.py b/litellm/llms/bedrock/claude_platform/transformation.py
index cea1140bf65..047f9d342e6 100644
--- a/litellm/llms/bedrock/claude_platform/transformation.py
+++ b/litellm/llms/bedrock/claude_platform/transformation.py
@@ -29,6 +29,9 @@ class BedrockClaudePlatformConfig(BedrockClaudePlatformMixin, AnthropicConfig):
     def should_strip_billing_metadata(self) -> bool:
         return True
 
+    def runs_hosted_mcp(self) -> bool:
+        return True
+
     def validate_environment(
         self,
         headers: dict,
diff --git a/litellm/llms/bedrock/common_utils.py b/litellm/llms/bedrock/common_utils.py
index e7647a3f58e..30a7ddb2224 100644
--- a/litellm/llms/bedrock/common_utils.py
+++ b/litellm/llms/bedrock/common_utils.py
@@ -1423,6 +1423,15 @@ def bedrock_supports_tool_search(model: str) -> bool:
     return AnthropicModelInfo.supports_model_capability(model, "supports_tool_search", "bedrock")
 
 
+def bedrock_supports_per_turn_control(model: str, model_info: Mapping[str, object] | None) -> bool:
+    from litellm.llms.anthropic.common_utils import AnthropicModelInfo
+
+    deployment_flag: Final = (model_info or {}).get("supports_per_turn_control")
+    if isinstance(deployment_flag, bool):
+        return deployment_flag
+    return AnthropicModelInfo.supports_model_capability(model, "supports_per_turn_control", "bedrock")
+
+
 def supports_bedrock_prompt_cache_ttl(model: str) -> bool:
     """
     Whether Bedrock accepts a ``ttl`` ("5m"/"1h") on prompt ``cache_control``
diff --git a/litellm/llms/bedrock/files/transformation.py b/litellm/llms/bedrock/files/transformation.py
index f14c72dff2c..1b3a1b206f5 100644
--- a/litellm/llms/bedrock/files/transformation.py
+++ b/litellm/llms/bedrock/files/transformation.py
@@ -944,7 +944,11 @@ class BedrockFilesConfig(BaseAWSLLM, BaseFilesConfig):
         model), so `input`, `instructions`, `max_output_tokens` and the tool
         params translate identically in batch and real time.
         """
-        return responses_batch_body_to_chat_body(openai_request_body)
+        chat_body: Final = responses_batch_body_to_chat_body(openai_request_body)
+        drop_params: Final = openai_request_body.get("drop_params")
+        if drop_params is None:
+            return chat_body
+        return _frozen_mapping(chain(chat_body.items(), (("drop_params", drop_params),)))
 
     @staticmethod
     def _transform_batch_body_to_chat_body(
@@ -1028,7 +1032,7 @@ class BedrockFilesConfig(BaseAWSLLM, BaseFilesConfig):
                 non_default_params=optional_params,
                 optional_params={},
                 model=model,
-                drop_params=False,
+                drop_params=optional_params.get("drop_params") is True,
             )
             return converse_config.transform_request(
                 model=model,
@@ -1042,7 +1046,7 @@ class BedrockFilesConfig(BaseAWSLLM, BaseFilesConfig):
         #     like openai.gpt-oss-*, qwen, deepseek, etc.) ---
         return {
             "messages": messages,
-            **optional_params,
+            **{k: v for k, v in optional_params.items() if k != "drop_params"},
         }
 
     def _resolve_batch_record_model_and_provider(
diff --git a/litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py b/litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py
index 984479ab4e4..d428b83451c 100644
--- a/litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py
+++ b/litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py
@@ -38,6 +38,7 @@ from litellm.llms.bedrock.chat.invoke_transformations.base_invoke_transformation
 from litellm.llms.bedrock.common_utils import (
     BedrockError,
     apply_bedrock_invoke_structured_output,
+    bedrock_supports_per_turn_control,
     bedrock_supports_tool_search,
     ensure_bedrock_anthropic_messages_tool_names,
     get_anthropic_beta_from_headers,
@@ -99,6 +100,13 @@ class AmazonAnthropicClaudeMessagesConfig(
     def beta_headers_provider(self) -> str:
         return self.custom_llm_provider or "bedrock"
 
+    def model_specific_anthropic_betas(self, model: str, litellm_params: GenericLiteLLMParams) -> frozenset[str]:
+        if bedrock_supports_per_turn_control(
+            model, _MODEL_INFO.validate_python(getattr(litellm_params, "model_info", None))
+        ):
+            return frozenset({ANTHROPIC_BETA_HEADER_VALUES.PER_TURN_CONTROL_2026_07_01.value})
+        return frozenset()
+
     BEDROCK_INVOKE_ALLOWED_TOP_LEVEL_FIELDS = frozenset(BedrockInvokeAnthropicMessagesRequest.__annotations__.keys())
 
     def get_error_class(
@@ -548,6 +556,7 @@ class AmazonAnthropicClaudeMessagesConfig(
         headers: dict,
         anthropic_messages_request: dict,
         injected_thinking_for_clear_thinking: bool,
+        litellm_params: GenericLiteLLMParams,
     ) -> list[str]:
         anthropic_model_info: Final = AnthropicModelInfo()
         tools: Final = anthropic_messages_optional_request_params.get("tools")
@@ -609,16 +618,22 @@ class AmazonAnthropicClaudeMessagesConfig(
         if "tool-search-tool-2025-10-19" in beta_set:
             beta_set.add("tool-examples-2025-10-29")
 
+        model_supported_betas: Final = self.model_specific_anthropic_betas(model, litellm_params) & user_beta_set
         beta_provider: Final = self.beta_headers_provider
         filtered_betas: Final = sorted(
-            filter_and_transform_beta_headers(
-                beta_headers=list(beta_set),
-                provider=beta_provider,
-            )
+            {
+                *filter_and_transform_beta_headers(
+                    beta_headers=list(beta_set),
+                    provider=beta_provider,
+                ),
+                *model_supported_betas,
+            }
         )
 
         dropped_user_betas: Final = sorted(
-            b for b in user_beta_set if not filter_and_transform_beta_headers([b], provider=beta_provider)
+            b
+            for b in user_beta_set - model_supported_betas
+            if not filter_and_transform_beta_headers([b], provider=beta_provider)
         )
         if dropped_user_betas:
             verbose_logger.warning(
@@ -802,6 +817,7 @@ class AmazonAnthropicClaudeMessagesConfig(
             headers=headers,
             anthropic_messages_request=anthropic_messages_request,
             injected_thinking_for_clear_thinking=injected_thinking_for_clear_thinking,
+            litellm_params=litellm_params,
         )
 
         if filtered_betas:
diff --git a/litellm/llms/custom_httpx/llm_http_handler.py b/litellm/llms/custom_httpx/llm_http_handler.py
index 141c78c97af..c042264c034 100644
--- a/litellm/llms/custom_httpx/llm_http_handler.py
+++ b/litellm/llms/custom_httpx/llm_http_handler.py
@@ -2289,7 +2289,11 @@ class BaseLLMHTTPHandler:
         )
 
         if anthropic_messages_provider_config.should_filter_anthropic_beta_headers():
-            headers = update_headers_with_filtered_beta(headers=headers, provider=custom_llm_provider)
+            headers = update_headers_with_filtered_beta(
+                headers=headers,
+                provider=custom_llm_provider,
+                keep=anthropic_messages_provider_config.model_specific_anthropic_betas(model, litellm_params),
+            )
 
         from litellm.llms.vertex_ai.vertex_llm_base import VertexBase
 
diff --git a/litellm/llms/databricks/chat/transformation.py b/litellm/llms/databricks/chat/transformation.py
index 2145c19a71a..8c96cc4f185 100644
--- a/litellm/llms/databricks/chat/transformation.py
+++ b/litellm/llms/databricks/chat/transformation.py
@@ -21,6 +21,7 @@ from litellm.litellm_core_utils.prompt_templates.common_utils import (
     strip_litellm_internal_message_fields,
     strip_name_from_message,
 )
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.llms.base_llm.base_model_iterator import BaseModelResponseIterator
 from litellm.llms.base_llm.base_utils import (
     type_to_response_format_param,  # pyright: ignore[reportUnknownVariableType]  # base_utils helper returns an untyped dict
@@ -283,7 +284,7 @@ class DatabricksConfig(DatabricksBase, OpenAILikeChatConfig, AnthropicConfig):
         complete_url: Final = f"{url_base}/chat/completions"
         return complete_url
 
-    def get_supported_openai_params(self, model: str | None = None) -> list:
+    def get_supported_openai_params(self, model: str | None = None) -> list[str]:
         return [
             "stream",
             "stop",
@@ -389,8 +390,13 @@ class DatabricksConfig(DatabricksBase, OpenAILikeChatConfig, AnthropicConfig):
         drop_params: bool,
         replace_max_completion_tokens_with_max_tokens: bool = True,
     ) -> dict:
-        is_thinking_enabled: Final = self.is_thinking_enabled(non_default_params)
-        mapped_params: Final = super().map_openai_params(non_default_params, optional_params, model, drop_params)
+        request_params: Final = (
+            tool_params_without_hosted_mcp(non_default_params, model=model, route="databricks", drop_params=drop_params)
+            if "claude" in model
+            else non_default_params
+        )
+        is_thinking_enabled: Final = self.is_thinking_enabled(request_params)
+        mapped_params: Final = super().map_openai_params(request_params, optional_params, model, drop_params)
         if "claude" in model:
             AnthropicConfig.translate_legacy_thinking_for_adaptive_model(
                 model=model, optional_params=mapped_params, custom_llm_provider="databricks", drop_params=drop_params
@@ -399,16 +405,16 @@ class DatabricksConfig(DatabricksBase, OpenAILikeChatConfig, AnthropicConfig):
             mapped_params["tools"] = self._map_openai_to_dbrx_tool(
                 model=model, tools=mapped_params["tools"], drop_params=drop_params
             )
-        if "max_completion_tokens" in non_default_params and replace_max_completion_tokens_with_max_tokens:
-            mapped_params["max_tokens"] = non_default_params[
+        if "max_completion_tokens" in request_params and replace_max_completion_tokens_with_max_tokens:
+            mapped_params["max_tokens"] = request_params[
                 "max_completion_tokens"
             ]  # most openai-compatible providers support 'max_tokens' not 'max_completion_tokens'
             mapped_params.pop("max_completion_tokens", None)
 
-        if "response_format" in non_default_params and "claude" in model:
+        if "response_format" in request_params and "claude" in model:
             _tool: Final = self.map_response_format_to_databricks_tool(
                 model,
-                non_default_params["response_format"],
+                request_params["response_format"],
                 mapped_params,
                 is_thinking_enabled,
             )
@@ -426,8 +432,8 @@ class DatabricksConfig(DatabricksBase, OpenAILikeChatConfig, AnthropicConfig):
                 "response_format", None
             )  # unsupported for claude models - if json_schema -> convert to tool call
 
-        if "reasoning_effort" in non_default_params and self._uses_anthropic_thinking_param(model):
-            reasoning_effort_value: Final = non_default_params.get("reasoning_effort")
+        if "reasoning_effort" in request_params and self._uses_anthropic_thinking_param(model):
+            reasoning_effort_value: Final = request_params.get("reasoning_effort")
             mapped_thinking: Final = AnthropicConfig._map_reasoning_effort(
                 reasoning_effort=reasoning_effort_value,
                 model=model,
@@ -453,7 +459,7 @@ class DatabricksConfig(DatabricksBase, OpenAILikeChatConfig, AnthropicConfig):
             optional_params.pop("reasoning_effort", None)
         ## handle thinking tokens
         self.update_optional_params_with_thinking_tokens(
-            non_default_params=non_default_params, optional_params=mapped_params
+            non_default_params=request_params, optional_params=mapped_params
         )
 
         return mapped_params
diff --git a/litellm/llms/deepgram/audio_transcription/transformation.py b/litellm/llms/deepgram/audio_transcription/transformation.py
index a3812dac8ef..c2ac3d0d5fb 100644
--- a/litellm/llms/deepgram/audio_transcription/transformation.py
+++ b/litellm/llms/deepgram/audio_transcription/transformation.py
@@ -128,7 +128,7 @@ class DeepgramAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
             return response
 
         except Exception as e:
-            raise ValueError(f"Error transforming Deepgram response: {e}\nResponse: {raw_response.text}")
+            raise ValueError(f"Error transforming Deepgram response: {e}") from None
 
     def _reconstruct_diarized_transcript(self, words: list) -> str:
         """
diff --git a/litellm/llms/deepseek/chat/transformation.py b/litellm/llms/deepseek/chat/transformation.py
index d3319856d29..a742cc6c4de 100644
--- a/litellm/llms/deepseek/chat/transformation.py
+++ b/litellm/llms/deepseek/chat/transformation.py
@@ -10,6 +10,7 @@ from litellm.litellm_core_utils.prompt_templates.common_utils import (
     convert_content_list_to_str,
     extract_search_results_text,
 )
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.secret_managers.main import get_secret_str
 from litellm.types.llms.openai import AllMessageValues
 from litellm.utils import supports_reasoning, supports_vision
@@ -18,17 +19,15 @@ from ...openai.chat.gpt_transformation import OpenAIGPTConfig
 
 
 class DeepSeekChatConfig(OpenAIGPTConfig):
-    def get_supported_openai_params(self, model: str) -> list:
+    def get_supported_openai_params(self, model: str) -> list[str]:
         """
         DeepSeek reasoner models support thinking parameter.
         """
-        params: Final = super().get_supported_openai_params(model)
-        params.extend(["thinking", "reasoning_effort"])
-        return params
+        return [*super().get_supported_openai_params(model), "thinking", "reasoning_effort"]
 
     def map_openai_params(
         self,
-        non_default_params: dict,
+        non_default_params: dict[str, object],
         optional_params: dict,
         model: str,
         drop_params: bool,
@@ -43,8 +42,18 @@ class DeepSeekChatConfig(OpenAIGPTConfig):
 
         Reference: https://api-docs.deepseek.com/guides/thinking_mode
         """
+        params_without_hosted_mcp: Final = tool_params_without_hosted_mcp(
+            non_default_params, model=model, route="deepseek", drop_params=drop_params
+        )
         # Let parent handle standard params first
-        optional_params = super().map_openai_params(non_default_params, optional_params, model, drop_params)
+        optional_params = super().map_openai_params(
+            params_without_hosted_mcp
+            if params_without_hosted_mcp is non_default_params
+            else self._drop_unsupported_tools(non_default_params),
+            optional_params,
+            model,
+            drop_params,
+        )
 
         # Pop thinking/reasoning_effort from optional_params first (parent may have added them)
         # Then re-add only if valid for DeepSeek
@@ -242,6 +251,7 @@ class DeepSeekChatConfig(OpenAIGPTConfig):
         tools: Final = optional_params.get("tools")
         if not isinstance(tools, list) or not tools:
             return optional_params
+        sent_tools: Final[tuple[object, ...]] = tuple(tools)
 
         def _is_function_tool(tool: object) -> bool:
             return isinstance(tool, dict) and tool.get("type") == "function"
@@ -266,14 +276,14 @@ class DeepSeekChatConfig(OpenAIGPTConfig):
             name: Final = function.get("name")
             return isinstance(name, str) and name in function_tool_names
 
-        function_tools: Final = [tool for tool in tools if _is_function_tool(tool)]
-        if len(function_tools) == len(tools):
+        function_tools: Final = [tool for tool in sent_tools if _is_function_tool(tool)]
+        if len(function_tools) == len(sent_tools):
             return optional_params
 
         dropped_types: Final = sorted(
             {
                 str(tool.get("type")) if isinstance(tool, dict) else type(tool).__name__
-                for tool in tools
+                for tool in sent_tools
                 if not _is_function_tool(tool)
             }
         )
diff --git a/litellm/llms/elevenlabs/audio_transcription/transformation.py b/litellm/llms/elevenlabs/audio_transcription/transformation.py
index 04d2717d64f..100d2c2fb02 100644
--- a/litellm/llms/elevenlabs/audio_transcription/transformation.py
+++ b/litellm/llms/elevenlabs/audio_transcription/transformation.py
@@ -152,7 +152,7 @@ class ElevenLabsAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
             return response
 
         except Exception as e:
-            raise ValueError(f"Error transforming ElevenLabs response: {e}\nResponse: {raw_response.text}")
+            raise ValueError(f"Error transforming ElevenLabs response: {e}") from None
 
     def get_complete_url(
         self,
diff --git a/litellm/llms/gemini/audio_transcription/transformation.py b/litellm/llms/gemini/audio_transcription/transformation.py
index 48a345a4940..5d3b5e96e0b 100644
--- a/litellm/llms/gemini/audio_transcription/transformation.py
+++ b/litellm/llms/gemini/audio_transcription/transformation.py
@@ -136,13 +136,13 @@ class GeminiAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
         except ValueError:
             raise GeminiError(
                 status_code=raw_response.status_code,
-                message=f"Received non-JSON response from Gemini Interactions API: {raw_response.text}",
+                message="Received non-JSON response from Gemini Interactions API",
             )
         parsed: Final = GeminiTranscriptionInteractionResponse.model_validate(response_json)
         if parsed.status != "completed":
             raise GeminiError(
                 status_code=raw_response.status_code,
-                message=f"Gemini transcription interaction did not complete (status={parsed.status}): {raw_response.text}",
+                message=f"Gemini transcription interaction did not complete (status={parsed.status})",
             )
         text_contents: Final = tuple(
             content
diff --git a/litellm/llms/gemini/chat/transformation.py b/litellm/llms/gemini/chat/transformation.py
index 143652ee77c..79842017c34 100644
--- a/litellm/llms/gemini/chat/transformation.py
+++ b/litellm/llms/gemini/chat/transformation.py
@@ -1,5 +1,5 @@
 from collections.abc import Mapping
-from typing import Final, cast
+from typing import ClassVar, Final, cast
 
 import litellm
 from litellm.litellm_core_utils.prompt_templates.factory import (
@@ -49,6 +49,8 @@ class GoogleAIStudioGeminiConfig(VertexGeminiConfig):
     Note: Please make sure to modify the default parameters as required for your use case.
     """
 
+    _route: ClassVar[str] = "gemini"
+
     temperature: float | None = None
     max_output_tokens: int | None = None
     top_p: float | None = None
diff --git a/litellm/llms/gigachat/chat/transformation.py b/litellm/llms/gigachat/chat/transformation.py
index 1fe7de0ba85..3ec46cb7e88 100644
--- a/litellm/llms/gigachat/chat/transformation.py
+++ b/litellm/llms/gigachat/chat/transformation.py
@@ -17,6 +17,7 @@ import httpx
 from pydantic import TypeAdapter
 
 from litellm._logging import verbose_logger
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.llms.base_llm.chat.transformation import BaseConfig, BaseLLMException
 from litellm.llms.gigachat.utils import convert_usage, get_api_base
 from litellm.secret_managers.main import get_secret_str
@@ -160,7 +161,10 @@ class GigaChatConfig(BaseConfig):
         drop_params: bool,
     ) -> dict:  # mutable-ok: base class contract returns dict
         """Map OpenAI parameters to GigaChat parameters."""
-        for param, value in non_default_params.items():
+        request_params: Final = tool_params_without_hosted_mcp(
+            dict(non_default_params), model=model, route="gigachat", drop_params=drop_params
+        )
+        for param, value in request_params.items():
             if param == "stream":
                 optional_params["stream"] = value
             elif param == "temperature":
diff --git a/litellm/llms/mistral/audio_transcription/transformation.py b/litellm/llms/mistral/audio_transcription/transformation.py
index 4fce7a95350..a17a572854c 100644
--- a/litellm/llms/mistral/audio_transcription/transformation.py
+++ b/litellm/llms/mistral/audio_transcription/transformation.py
@@ -133,7 +133,7 @@ class MistralAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
             response_json: Final = raw_response.json()
         except Exception:
             raise MistralAudioTranscriptionException(
-                message=raw_response.text,
+                message="Received non-JSON response from Mistral audio transcription",
                 status_code=raw_response.status_code,
                 headers=raw_response.headers,
             )
diff --git a/litellm/llms/ollama/chat/transformation.py b/litellm/llms/ollama/chat/transformation.py
index 644ab187f15..46b4caad43f 100644
--- a/litellm/llms/ollama/chat/transformation.py
+++ b/litellm/llms/ollama/chat/transformation.py
@@ -4,7 +4,7 @@ from collections.abc import AsyncIterator, Iterator, Mapping
 from typing import TYPE_CHECKING, Any, Final, cast
 
 from httpx._models import Headers, Response
-from pydantic import BaseModel
+from pydantic import BaseModel, TypeAdapter
 
 import litellm
 from litellm._uuid import uuid
@@ -14,6 +14,7 @@ from litellm.litellm_core_utils.prompt_templates.common_utils import (
     extract_images_from_message,
     extract_reasoning_content,
 )
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.llms.base_llm.base_model_iterator import BaseModelResponseIterator
 from litellm.llms.base_llm.chat.transformation import BaseConfig, BaseLLMException
 from litellm.types.llms.ollama import (
@@ -38,6 +39,8 @@ if TYPE_CHECKING:
 else:
     LiteLLMLoggingObj = Any
 
+_REQUEST_PARAMS: Final = TypeAdapter(dict[str, object])
+
 
 class OllamaChatConfig(BaseConfig):
     """
@@ -150,7 +153,13 @@ class OllamaChatConfig(BaseConfig):
         model: str,
         drop_params: bool,
     ) -> dict:
-        for param, value in non_default_params.items():
+        request_params: Final = tool_params_without_hosted_mcp(
+            _REQUEST_PARAMS.validate_python(non_default_params),
+            model=model,
+            route="ollama_chat",
+            drop_params=drop_params,
+        )
+        for param, value in request_params.items():
             if param == "max_tokens" or param == "max_completion_tokens":
                 optional_params["num_predict"] = value
             if param == "stream":
diff --git a/litellm/llms/openai/openai.py b/litellm/llms/openai/openai.py
index bf33070faa6..b4df0624e68 100644
--- a/litellm/llms/openai/openai.py
+++ b/litellm/llms/openai/openai.py
@@ -1,3 +1,4 @@
+import inspect
 import time
 import types
 from collections.abc import AsyncIterator, Callable, Coroutine, Iterable, Iterator, Mapping
@@ -351,6 +352,11 @@ _EXTRA_HEADERS_ADAPTER: Final = TypeAdapter(dict[str, str] | None)
 _EXTRA_QUERY_ADAPTER: Final = TypeAdapter(dict[str, object] | None)
 _NO_EXTRA_HEADERS: Final[Mapping[str, str]] = types.MappingProxyType({})
 _SDK_OPTION_KEYS: Final = frozenset(("extra_headers", "extra_query", "extra_body"))
+_CLIENT_API_KEY_ONLY_AUTH: Final[Mapping[str, Mapping[str, bool]]] = (
+    types.MappingProxyType({"security": types.MappingProxyType({"bearer_auth": True})})
+    if "security" in inspect.signature(make_request_options).parameters
+    else types.MappingProxyType({})
+)
 
 
 def _raw_chat_response(
@@ -370,6 +376,7 @@ def _request_without_sdk_transform(
         extra_query=_EXTRA_QUERY_ADAPTER.validate_python(data.get("extra_query")),
         extra_body=data.get("extra_body"),
         timeout=timeout,
+        **_CLIENT_API_KEY_ONLY_AUTH,  # pyright: ignore[reportArgumentType]  # openai<3 make_request_options has no security kwarg
     )
     return body, options
 
diff --git a/litellm/llms/openai/transcriptions/whisper_transformation.py b/litellm/llms/openai/transcriptions/whisper_transformation.py
index 8f96f688189..50da4e57dad 100644
--- a/litellm/llms/openai/transcriptions/whisper_transformation.py
+++ b/litellm/llms/openai/transcriptions/whisper_transformation.py
@@ -140,7 +140,4 @@ class OpenAIWhisperAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
         if any(key in raw_response_json for key in TranscriptionResponse.model_fields):
             return TranscriptionResponse(**raw_response_json)
         else:
-            raise ValueError(
-                "Invalid response format. Received response does not match the expected format. Got: ",
-                raw_response_json,
-            )
+            raise ValueError("Invalid response format. Received response does not match the expected format.")
diff --git a/litellm/llms/ovhcloud/audio_transcription/transformation.py b/litellm/llms/ovhcloud/audio_transcription/transformation.py
index 3ae5f6fa69c..4cc05753eed 100644
--- a/litellm/llms/ovhcloud/audio_transcription/transformation.py
+++ b/litellm/llms/ovhcloud/audio_transcription/transformation.py
@@ -144,7 +144,7 @@ class OVHCloudAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
             response_json: Final = raw_response.json()
         except Exception:
             raise OVHCloudException(
-                message=raw_response.text,
+                message="Received non-JSON response from OVHCloud audio transcription",
                 status_code=raw_response.status_code,
                 headers=raw_response.headers,
             )
diff --git a/litellm/llms/scaleway/audio_transcription/transformation.py b/litellm/llms/scaleway/audio_transcription/transformation.py
index 7ebf4475355..ce63452a45a 100644
--- a/litellm/llms/scaleway/audio_transcription/transformation.py
+++ b/litellm/llms/scaleway/audio_transcription/transformation.py
@@ -134,7 +134,7 @@ class ScalewayAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
             response_json: Final = raw_response.json()
         except Exception:
             raise ScalewayAudioTranscriptionException(
-                message=raw_response.text,
+                message="Received non-JSON response from Scaleway audio transcription",
                 status_code=raw_response.status_code,
                 headers=raw_response.headers,
             )
diff --git a/litellm/llms/vertex_ai/audio_transcription/gemini_transcribe_transformation.py b/litellm/llms/vertex_ai/audio_transcription/gemini_transcribe_transformation.py
index f4db5eb110c..23476e0e52e 100644
--- a/litellm/llms/vertex_ai/audio_transcription/gemini_transcribe_transformation.py
+++ b/litellm/llms/vertex_ai/audio_transcription/gemini_transcribe_transformation.py
@@ -180,7 +180,7 @@ class VertexGeminiAudioTranscriptionConfig(BaseAudioTranscriptionConfig, VertexB
         except ValueError:
             raise VertexAIError(
                 status_code=raw_response.status_code,
-                message=f"Received non-JSON response from Vertex AI Gemini transcription: {raw_response.text}",
+                message="Received non-JSON response from Vertex AI Gemini transcription",
             )
         parsed: Final = VertexGeminiTranscriptionResponse.model_validate(response_json)
         texts: Final = tuple(
diff --git a/litellm/llms/vertex_ai/audio_transcription/transformation.py b/litellm/llms/vertex_ai/audio_transcription/transformation.py
index 5603be81095..cf909787e2e 100644
--- a/litellm/llms/vertex_ai/audio_transcription/transformation.py
+++ b/litellm/llms/vertex_ai/audio_transcription/transformation.py
@@ -171,7 +171,7 @@ class VertexAIAudioTranscriptionConfig(BaseAudioTranscriptionConfig, VertexBase)
         except ValueError:
             raise VertexAIError(
                 status_code=raw_response.status_code,
-                message=f"Received non-JSON response from Google Speech-to-Text: {raw_response.text}",
+                message="Received non-JSON response from Google Speech-to-Text",
             )
         parsed: Final = VertexSpeechToTextRecognizeResponse.model_validate(response_json)
         transcripts: Final = tuple(
diff --git a/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py b/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py
index 5faf24ac92b..311d23f363d 100644
--- a/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py
+++ b/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py
@@ -8,7 +8,7 @@ from collections.abc import Awaitable, Callable, Mapping, Sequence
 from copy import deepcopy
 from functools import partial
 from types import MappingProxyType
-from typing import TYPE_CHECKING, Any, Final, Literal, Optional, Protocol, Union, cast, get_args
+from typing import TYPE_CHECKING, Any, ClassVar, Final, Literal, Optional, Protocol, Union, cast, get_args
 
 import httpx
 from pydantic import JsonValue
@@ -32,6 +32,7 @@ from litellm.litellm_core_utils.json_fragment_accumulator import JSONFragmentAcc
 from litellm.litellm_core_utils.prompt_templates.factory import (
     encode_tool_call_id_with_signature,
 )
+from litellm.litellm_core_utils.tool_fields import tool_params_without_hosted_mcp
 from litellm.llms.base_llm.chat.transformation import BaseConfig, BaseLLMException
 from litellm.llms.custom_httpx.http_handler import (
     AsyncHTTPHandler,
@@ -279,6 +280,8 @@ class VertexGeminiConfig(VertexAIBaseConfig, BaseConfig):
     Note: Please make sure to modify the default parameters as required for your use case.
     """
 
+    _route: ClassVar[str] = "vertex_ai"
+
     temperature: float | None = None
     max_output_tokens: int | None = None
     top_p: float | None = None
@@ -1245,9 +1248,12 @@ class VertexGeminiConfig(VertexAIBaseConfig, BaseConfig):
         model: str,
         drop_params: bool,
     ) -> dict:
-        self._apply_include_server_side_tool_invocations(non_default_params, optional_params)
+        request_params: Final = tool_params_without_hosted_mcp(
+            non_default_params, model=model, route=self._route, drop_params=drop_params
+        )
+        self._apply_include_server_side_tool_invocations(request_params, optional_params)
         gemini_sampling_params_warned: bool = False
-        for param, value in non_default_params.items():
+        for param, value in request_params.items():
             if param == "temperature":
                 if VertexGeminiConfig._is_gemini_3_or_newer(model):
                     if value is not None and value < 1.0:
@@ -1317,7 +1323,7 @@ class VertexGeminiConfig(VertexAIBaseConfig, BaseConfig):
                 if _tool_choice_value is not None:
                     optional_params["tool_choice"] = _tool_choice_value
             elif param == "parallel_tool_calls":
-                tools_list = non_default_params.get("tools", non_default_params.get("functions"))
+                tools_list = request_params.get("tools", request_params.get("functions"))
                 num_tools = len(tools_list) if isinstance(tools_list, list) else 0
                 # Gemini does not support parallel_tool_calls=False with multiple
                 # tools. Drop the param instead of failing — Responses API clients
diff --git a/litellm/llms/vertex_ai/text_to_speech/transformation.py b/litellm/llms/vertex_ai/text_to_speech/transformation.py
index 2fae2a9de1c..eaaa600b870 100644
--- a/litellm/llms/vertex_ai/text_to_speech/transformation.py
+++ b/litellm/llms/vertex_ai/text_to_speech/transformation.py
@@ -49,6 +49,43 @@ _LyriaVoice: TypeAlias = str | dict | None
 _JSON_OBJECT: Final = TypeAdapter(Mapping[str, object], config=ConfigDict(hide_input_in_errors=True))
 _JSON_ARRAY: Final = TypeAdapter(tuple[object, ...], config=ConfigDict(hide_input_in_errors=True))
 _STR: Final = TypeAdapter(str, config=ConfigDict(hide_input_in_errors=True))
+_CLOUD_TTS_LOCATIONS: Final = MappingProxyType(
+    {
+        **dict.fromkeys(
+            (
+                "us",
+                "us-central1",
+                "us-east1",
+                "us-east4",
+                "us-east5",
+                "us-south1",
+                "us-west1",
+                "us-west2",
+                "us-west3",
+                "us-west4",
+                "us-west5",
+            ),
+            "us",
+        ),
+        **dict.fromkeys(
+            (
+                "eu",
+                "europe-central2",
+                "europe-north1",
+                "europe-north2",
+                "europe-southwest1",
+                "europe-west1",
+                "europe-west3",
+                "europe-west4",
+                "europe-west8",
+                "europe-west9",
+                "europe-west10",
+                "europe-west12",
+            ),
+            "eu",
+        ),
+    }
+)
 
 
 class VertexAITextToSpeechConfig(BaseTextToSpeechConfig, VertexBase):
@@ -173,7 +210,7 @@ class VertexAITextToSpeechConfig(BaseTextToSpeechConfig, VertexBase):
         # Resolve Vertex AI credentials using VertexBase helpers
         vertex_credentials: Final = self.safe_get_vertex_ai_credentials(litellm_params_dict)
         vertex_project: Final = self.safe_get_vertex_ai_project(litellm_params_dict)
-        vertex_location: Final = self.safe_get_vertex_ai_location(litellm_params_dict)
+        vertex_location: Final = self.explicit_vertex_ai_location(litellm_params_dict)
 
         # Convert voice to string if it's a dict (extract name)
         # Actual voice mapping happens in map_openai_params
@@ -314,7 +351,11 @@ class VertexAITextToSpeechConfig(BaseTextToSpeechConfig, VertexBase):
         if api_base:
             return api_base
 
-        return self.TTS_API_URL
+        location: Final = _JSON_OBJECT.validate_python(litellm_params).get("vertex_location")
+        cloud_tts_location: Final = _CLOUD_TTS_LOCATIONS.get(location) if isinstance(location, str) else None
+        if cloud_tts_location is None:
+            return self.TTS_API_URL
+        return f"https://{cloud_tts_location}-texttospeech.googleapis.com/v1/text:synthesize"
 
     def _validate_vertex_input(
         self,
diff --git a/litellm/llms/watsonx/audio_transcription/transformation.py b/litellm/llms/watsonx/audio_transcription/transformation.py
index 77ef03b8e10..4ec112c42a8 100644
--- a/litellm/llms/watsonx/audio_transcription/transformation.py
+++ b/litellm/llms/watsonx/audio_transcription/transformation.py
@@ -174,7 +174,7 @@ class IBMWatsonXAudioTranscriptionConfig(IBMWatsonXMixin, OpenAIWhisperAudioTran
         try:
             raw_response_json: Final = raw_response.json()
         except Exception as e:
-            raise ValueError(f"Error transforming response to json: {e}\nResponse: {raw_response.text}")
+            raise ValueError(f"Error transforming response to json: {e}")
 
         # Extract only valid fields for TranscriptionResponse.__init__()
         # TranscriptionResponse only accepts 'text' and 'usage' in __init__()
@@ -190,10 +190,7 @@ class IBMWatsonXAudioTranscriptionConfig(IBMWatsonXMixin, OpenAIWhisperAudioTran
             response_kwargs["usage"] = usage
 
         if not response_kwargs:
-            raise ValueError(
-                "Invalid response format. Received response does not match the expected format. Got: ",
-                response_object,
-            )
+            raise ValueError("Invalid response format. Received response does not match the expected format.")
 
         response: Final = TranscriptionResponse(**response_kwargs)
 
diff --git a/litellm/llms/xai/audio_transcription/transformation.py b/litellm/llms/xai/audio_transcription/transformation.py
index e34034b5ae9..ca8b6837b94 100644
--- a/litellm/llms/xai/audio_transcription/transformation.py
+++ b/litellm/llms/xai/audio_transcription/transformation.py
@@ -38,7 +38,7 @@ class _XAISttWord(LiteLLMBaseModel):
 
 
 class _XAISttResponse(LiteLLMBaseModel):
-    model_config = ConfigDict(extra="allow")
+    model_config = ConfigDict(extra="allow", hide_input_in_errors=True)
     text: str = ""
     language: str = "unknown"
     duration: float | None = None
diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index 2c183527ce8..891e247747e 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -64002,6 +64002,15 @@
                     "supports_tool_search": true
                 }
             },
+            {
+                "name": "claude-per-turn-control",
+                "pattern": "claude-[a-z]+-(?:4[-._](?:[5-9]|[1-9]\\d)(?!\\d)|[5-9](?!\\d)(?:[-._]\\d{1,2}(?!\\d))?)",
+                "fill_missing_for_providers": ["bedrock", "bedrock_converse"],
+                "description": "Claude at version 4.5 or higher, with the same id shapes and version boundaries as claude-tool-search. On 2026-11-05 Bedrock InvokeModel answered 200 with the per-turn-control-2026-07-01 beta on every Claude 4.5 and newer model a QA account reached across 13 regions, and 400 invalid beta flag on Claude 3 Haiku in ca-central-1. The jp., au. and in. profiles answered 200 too, AWS lists no apac. profile for Claude 4.5 or newer, and GovCloud was not tested. Claude 3.5, 3.7, Sonnet 4, Opus 4 and Opus 4.1 were unreachable, so they keep the beta dropped as before. The flag means Bedrock accepts the beta name on the model, as supports_tool_search does for the tool search beta, and Bedrock Invoke forwards the beta only where it is set. It does not promise per-turn output_config works, since on 2026-11-05 Opus 4.8, Opus 5, Sonnet 5 and Fable 5 rejected it with or without the beta. A deployment turns the forward off with model_info supports_per_turn_control false.",
+                "model_info": {
+                    "supports_per_turn_control": true
+                }
+            },
             {
                 "name": "wandb-reasoning-baseline",
                 "pattern": "^wandb/",
diff --git a/litellm/proxy/db/db_transaction_queue/redis_update_buffer.py b/litellm/proxy/db/db_transaction_queue/redis_update_buffer.py
index 22f55ea9153..8fbaa7e3a9a 100644
--- a/litellm/proxy/db/db_transaction_queue/redis_update_buffer.py
+++ b/litellm/proxy/db/db_transaction_queue/redis_update_buffer.py
@@ -13,7 +13,6 @@ from itertools import chain
 from typing import TYPE_CHECKING, Any, Final, Literal, TypeAlias, TypeVar, cast
 
 from pydantic import TypeAdapter
-
 from redis.exceptions import RedisError
 
 from litellm._internal_context import with_service_target
diff --git a/litellm/proxy/db/db_transaction_queue/tool_discovery_queue.py b/litellm/proxy/db/db_transaction_queue/tool_discovery_queue.py
index e9ec040023c..abbeab7f89d 100644
--- a/litellm/proxy/db/db_transaction_queue/tool_discovery_queue.py
+++ b/litellm/proxy/db/db_transaction_queue/tool_discovery_queue.py
@@ -55,3 +55,10 @@ class ToolDiscoveryQueue:
         """Return and clear all pending rows."""
         items, self._pending = list(self._pending.values()), {}
         return items
+
+    def requeue(self, items: Iterable[ToolDiscoveryQueueItem]) -> None:
+        """Put rows from a failed write back, ahead of and merged with anything queued since the flush."""
+        since_flush: Final = self._pending
+        self._pending = {}
+        for item in (*items, *since_flush.values()):
+            self.add_update(item)
diff --git a/litellm/proxy/db/exception_handler.py b/litellm/proxy/db/exception_handler.py
index 669df7454e3..23d83829d8c 100644
--- a/litellm/proxy/db/exception_handler.py
+++ b/litellm/proxy/db/exception_handler.py
@@ -31,6 +31,24 @@ _CONNECTION_CAPACITY_PHRASES: Final = (
     "too many connections for database",
     "remaining connection slots are reserved",
 )
+_NOT_ACCEPTING_CONNECTIONS_SQLSTATE: Final = "57P03"
+_NOT_ACCEPTING_CONNECTIONS_PHRASES: Final = (
+    "the database system is starting up",
+    "the database system is shutting down",
+    "the database system is not yet accepting connections",
+    "the database system is not accepting connections",
+    "the database system is in recovery mode",
+)
+_SERVER_TERMINATED_SQLSTATES: Final = frozenset({"57P01", "57P02", "57P05"})
+_SERVER_TERMINATED_PHRASES: Final = (
+    "terminating connection due to administrator command",
+    "terminating connection due to immediate shutdown command",
+    "terminating connection because of unexpected sigquit signal",
+    "terminating connection because of crash of another server process",
+    "terminating connection due to idle-session timeout",
+)
+_UNREACHABLE_PRISMA_CODE: Final = "P1001"
+_UNREACHABLE_PHRASES: Final = ("can't reach database server", "cannot reach database server")
 _PRISMA_POOL_TIMEOUT_CODE: Final = "P2024"
 _LOCK_TIMEOUT_SQLSTATE: Final = "55P03"
 _LOCK_TIMEOUT_PHRASE: Final = "canceling statement due to lock timeout"
@@ -74,6 +92,22 @@ def _exception_types(*candidates: object) -> tuple[type[BaseException], ...]:
     return tuple(c for c in candidates if isinstance(c, type) and issubclass(c, BaseException))
 
 
+def _prisma_error_code(e: Exception) -> str | None:
+    import prisma.engine.errors
+
+    if isinstance(e, _exception_types(prisma.errors.DataError)):
+        code: Final[object] = getattr(e, "code", None)
+        return code if isinstance(code, str) else None
+    if not isinstance(e, _exception_types(prisma.engine.errors.EngineRequestError)):
+        return None
+    try:
+        body: Final = _DATABASE_ERROR_META.validate_json(str(e).partition(": ")[2])
+    except ValidationError:
+        return None
+    engine_code: Final = body.get("error_code")
+    return engine_code if isinstance(engine_code, str) else None
+
+
 class PrismaDBExceptionHandler:
     """
     Class to handle DB Exceptions or Connection Errors
@@ -123,6 +157,8 @@ class PrismaDBExceptionHandler:
             return True
         if PrismaDBExceptionHandler.is_database_capacity_error(e):
             return True
+        if PrismaDBExceptionHandler.is_database_not_accepting_connections_error(e):
+            return True
         return isinstance(e, ProxyException) and e.type == ProxyErrorTypes.no_db_connection
 
     @staticmethod
@@ -271,6 +307,39 @@ class PrismaDBExceptionHandler:
         error_message: Final = str(e).lower()
         return any(phrase in error_message for phrase in _CONNECTION_CAPACITY_PHRASES)
 
+    @staticmethod
+    def is_database_not_accepting_connections_error(e: Exception) -> bool:
+        """True iff Postgres refused the connection because it is starting up, shutting
+        down or in crash recovery (SQLSTATE 57P03). The refusal comes before any statement
+        runs, so nothing the write carried was applied."""
+        import prisma
+
+        if not isinstance(e, _exception_types(prisma.errors.PrismaError)):
+            return False
+        if PrismaDBExceptionHandler.postgres_sqlstate(e) == _NOT_ACCEPTING_CONNECTIONS_SQLSTATE:
+            return True
+        error_message: Final = str(e).lower()
+        return any(phrase in error_message for phrase in _NOT_ACCEPTING_CONNECTIONS_PHRASES)
+
+    @staticmethod
+    def is_database_lifecycle_error(e: Exception) -> bool:
+        """True iff Postgres failed the statement because of a server lifecycle event:
+        a refused connection during startup, shutdown or recovery (57P03), or a session
+        the server terminated (57P01, 57P02, 57P05). The server comes back on its own,
+        so the rows are not at fault. A terminated session may have committed before it
+        was cut, so only ``is_database_not_accepting_connections_error`` proves a
+        non-idempotent write never applied."""
+        import prisma
+
+        if PrismaDBExceptionHandler.is_database_not_accepting_connections_error(e):
+            return True
+        if not isinstance(e, _exception_types(prisma.errors.PrismaError)):
+            return False
+        if PrismaDBExceptionHandler.postgres_sqlstate(e) in _SERVER_TERMINATED_SQLSTATES:
+            return True
+        error_message: Final = str(e).lower()
+        return any(phrase in error_message for phrase in _SERVER_TERMINATED_PHRASES)
+
     @staticmethod
     def is_lock_timeout_error(e: Exception) -> bool:
         """True iff Postgres cancelled a statement for exceeding ``lock_timeout``
@@ -388,6 +457,8 @@ class PrismaDBExceptionHandler:
             return True
         if PrismaDBExceptionHandler.is_database_capacity_error(e):
             return True
+        if PrismaDBExceptionHandler.is_database_lifecycle_error(e):
+            return True
         if PrismaDBExceptionHandler.is_prisma_engine_internal_error(e):
             return True
         if "cached plan must not change result type" in str(e).lower():
@@ -662,3 +733,18 @@ def db_write_failure_is_requeue_safe(e: Exception) -> bool:
         return isinstance(e, DB_RETRY_SAFE_ERROR_TYPES)
     sqlstate: Final = PrismaDBExceptionHandler.postgres_sqlstate(e)
     return sqlstate is None or sqlstate[:2] not in _DATA_REJECTED_SQLSTATE_CLASSES
+
+
+def db_write_never_sent(e: Exception) -> bool:
+    """Whether the database could not take the write at all, because it was unreachable (P1001),
+    refusing connections (57P03) or full (53300, P2024), so even a non-idempotent write can be sent again."""
+    if PrismaDBExceptionHandler.is_database_not_accepting_connections_error(e):
+        return True
+    if PrismaDBExceptionHandler.is_database_capacity_error(e):
+        return True
+    if _prisma_error_code(e) == _UNREACHABLE_PRISMA_CODE:
+        return True
+    if not PrismaDBExceptionHandler.is_prisma_error(e):
+        return False
+    error_message: Final = str(e).lower()
+    return any(phrase in error_message for phrase in _UNREACHABLE_PHRASES)
diff --git a/litellm/proxy/db/tool_registry_writer.py b/litellm/proxy/db/tool_registry_writer.py
index f7ec88945a1..9600fb40ad3 100644
--- a/litellm/proxy/db/tool_registry_writer.py
+++ b/litellm/proxy/db/tool_registry_writer.py
@@ -23,7 +23,11 @@ from litellm.proxy.db.db_transaction_queue.tool_discovery_queue import (
     ToolDiscoveryQueue,
     aggregate_tool_discoveries,
 )
-from litellm.proxy.db.exception_handler import call_with_db_reconnect_retry, db_write_failure_is_requeue_safe
+from litellm.proxy.db.exception_handler import (
+    call_with_db_reconnect_retry,
+    db_write_failure_is_requeue_safe,
+    db_write_never_sent,
+)
 from litellm.proxy.db.tool_table_bulk_upsert import build_tool_bulk_upsert
 from litellm.repositories.object_permission_repository import ObjectPermissionRepository
 from litellm.repositories.prisma_protocols import TableActions
@@ -134,8 +138,19 @@ async def flush_tool_discovery_queue(prisma_client: "PrismaClient", tool_discove
         return
     try:
         await batch_upsert_tools(prisma_client=prisma_client, items=items)
-    except Exception as e:  # noqa: BLE001  # a lost tool row only delays its discovery, the scheduler job must not fail
-        verbose_proxy_logger.debug("flush_tool_discovery_queue error (non-blocking): %s", e)
+    except Exception as e:  # noqa: BLE001  # the rows go back to the queue or are dropped, the scheduler job must not fail
+        if db_write_never_sent(e):
+            tool_discovery_queue.requeue(items)
+            verbose_proxy_logger.warning(
+                "Tool discovery - %d tool rows went back to the queue for the next tick. Error: %s", len(items), str(e)
+            )
+            return
+        verbose_proxy_logger.error(
+            "Tool discovery - dropped %d tool rows: the failed statement may have applied or the database "
+            "refused the data, so re-sending it is not safe. Error: %s",
+            len(items),
+            str(e),
+        )
 
 
 async def commit_tool_discoveries(
diff --git a/litellm/proxy/guardrails/guardrail_hooks/mcp_security/mcp_security_guardrail.py b/litellm/proxy/guardrails/guardrail_hooks/mcp_security/mcp_security_guardrail.py
index 8482567b6da..66f493bcea3 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/mcp_security/mcp_security_guardrail.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/mcp_security/mcp_security_guardrail.py
@@ -18,6 +18,7 @@ from litellm.integrations.custom_guardrail import (
 from litellm.proxy._types import UserAPIKeyAuth
 from litellm.responses.mcp.litellm_proxy_mcp_handler import (
     LITELLM_PROXY_MCP_SERVER_URL_PREFIX,
+    saved_toolset_exists,
 )
 from litellm.types.guardrails import GuardrailEventHooks
 
@@ -106,7 +107,9 @@ class MCPSecurityGuardrail(CustomGuardrail):
         )
 
         async with global_mcp_server_manager.catalog.operation():
-            registry: Final = global_mcp_server_manager.get_registry()
-            registered_names: Final = set(registry.keys())
-
-            return frozenset(requested_servers - registered_names)
+            not_servers: Final = frozenset(
+                name
+                for name in requested_servers
+                if global_mcp_server_manager.get_mcp_server_by_identifier(name) is None
+            )
+            return frozenset([name for name in not_servers if not await saved_toolset_exists(name)])
diff --git a/litellm/proxy/utils.py b/litellm/proxy/utils.py
index 486028297b3..8479f8e45b9 100644
--- a/litellm/proxy/utils.py
+++ b/litellm/proxy/utils.py
@@ -198,6 +198,7 @@ from litellm.proxy.db.db_url_settings import (
 from litellm.proxy.db.exception_handler import (
     PrismaDBExceptionHandler,
     call_with_db_reconnect_retry,
+    db_write_never_sent,
 )
 from litellm.proxy.db.health_check_latest import (
     LatestHealthCheckRow,
@@ -8500,9 +8501,20 @@ async def update_daily_tag_spend(
 
 def _rollup_batch_never_applied(e: Exception) -> bool:
     """True when a drained rollup batch provably never reached its rows: Postgres had no
-    connection for it (53300) or cancelled it under ``lock_timeout`` before it took the row
-    lock (55P03). Either way re-sending the batch cannot double-count, so it is requeued."""
-    return PrismaDBExceptionHandler.is_database_capacity_error(e) or PrismaDBExceptionHandler.is_lock_timeout_error(e)
+    connection for it (53300), was unreachable or refusing connections (P1001, 57P03), or
+    cancelled it under ``lock_timeout`` before it took the row lock (55P03). In each case
+    re-sending the batch cannot double-count, so it is requeued."""
+    return (
+        PrismaDBExceptionHandler.is_database_capacity_error(e)
+        or db_write_never_sent(e)
+        or PrismaDBExceptionHandler.is_lock_timeout_error(e)
+    )
+
+
+def _rollup_failure_stops_job(e: Exception) -> bool:
+    """True when the database cannot take any write, so the job stops instead of draining
+    the queues after this one into the same failure."""
+    return PrismaDBExceptionHandler.is_database_capacity_error(e) or db_write_never_sent(e)
 
 
 async def update_spend_logs_job(
@@ -8593,12 +8605,12 @@ async def _run_spend_logs_job(
                     *prisma_client.tool_usage_transactions,
                 ]
             verbose_proxy_logger.warning(
-                "Spend tracking - database out of connections or rollup row lock timed out during tool usage "
+                "Spend tracking - database unavailable or rollup row lock timed out during tool usage "
                 "flush, requeued %s tool usage transactions for the next flush: %s",
                 len(tool_usage_to_process),
                 tool_tracking_err,
             )
-            if PrismaDBExceptionHandler.is_database_capacity_error(tool_tracking_err):
+            if _rollup_failure_stops_job(tool_tracking_err):
                 raise
         else:
             verbose_proxy_logger.error(
@@ -8625,12 +8637,12 @@ async def _run_spend_logs_job(
                     *prisma_client.model_usage_transactions,
                 ]
             verbose_proxy_logger.warning(
-                "Spend tracking - database out of connections or rollup row lock timed out during model usage "
+                "Spend tracking - database unavailable or rollup row lock timed out during model usage "
                 "flush, requeued %s model usage transactions for the next flush: %s",
                 len(model_usage_to_process),
                 model_usage_err,
             )
-            if PrismaDBExceptionHandler.is_database_capacity_error(model_usage_err):
+            if _rollup_failure_stops_job(model_usage_err):
                 raise
         else:
             verbose_proxy_logger.error(
@@ -8807,6 +8819,7 @@ def _is_transient_spend_log_write_error(e: Exception) -> bool:
     return (
         PrismaDBExceptionHandler.is_database_transport_error(e)
         or PrismaDBExceptionHandler.is_prisma_engine_internal_error(e)
+        or PrismaDBExceptionHandler.is_database_lifecycle_error(e)
         or PrismaDBExceptionHandler.is_deadlock_error(e)
     )
 
diff --git a/litellm/responses/litellm_completion_transformation/transformation.py b/litellm/responses/litellm_completion_transformation/transformation.py
index 2e7fb6da194..31cd78c7517 100644
--- a/litellm/responses/litellm_completion_transformation/transformation.py
+++ b/litellm/responses/litellm_completion_transformation/transformation.py
@@ -41,7 +41,7 @@ from litellm._logging import verbose_logger
 from litellm.caching import InMemoryCache
 from litellm.constants import REDACTED_BY_LITELLM, REDACTED_TOOL_CALL_ARGUMENTS_PLACEHOLDER
 from litellm.integrations.anthropic_cache_control_hook import MAX_CACHE_CONTROL_BLOCKS, AnthropicCacheControlHook
-from litellm.litellm_core_utils.core_helpers import normalize_drop_params
+from litellm.litellm_core_utils.core_helpers import drops_unsupported_params, normalize_drop_params
 from litellm.litellm_core_utils.get_supported_openai_params import (
     get_supported_openai_params,
 )
@@ -322,10 +322,6 @@ def _dropped_cache_control(_: object) -> None:
     return None
 
 
-def drops_unsupported_params(drop_params: object) -> bool:
-    return litellm.drop_params is True or normalize_drop_params(drop_params) is True
-
-
 def _without_cache_control_key(item: object) -> object:
     if not isinstance(item, dict):
         return item
diff --git a/litellm/responses/mcp/litellm_proxy_mcp_handler.py b/litellm/responses/mcp/litellm_proxy_mcp_handler.py
index b711d051055..1dfa4b2abcb 100644
--- a/litellm/responses/mcp/litellm_proxy_mcp_handler.py
+++ b/litellm/responses/mcp/litellm_proxy_mcp_handler.py
@@ -105,7 +105,7 @@ def _registry_serves(name: str, servers: Collection[MCPServer]) -> bool:
     )
 
 
-async def _toolset_exists(name: str) -> bool:
+async def saved_toolset_exists(name: str) -> bool:
     try:
         from litellm.proxy._experimental.mcp_server.mcp_server_manager import (
             global_mcp_server_manager,
@@ -124,7 +124,7 @@ async def _toolset_exists(name: str) -> bool:
 async def _gateway_served_names(
     names: Collection[str],
     servers: Callable[[], Collection[MCPServer]] = _registered_mcp_servers,
-    toolset_exists: Callable[[str], Awaitable[bool]] = _toolset_exists,
+    toolset_exists: Callable[[str], Awaitable[bool]] = saved_toolset_exists,
 ) -> frozenset[str]:
     registered: Final = tuple(servers()) if names else ()
     return frozenset([name for name in names if _registry_serves(name, registered) or await toolset_exists(name)])
diff --git a/litellm/router.py b/litellm/router.py
index 41706bdf539..244fac94d42 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -14072,6 +14072,7 @@ class Router:
             request_kwargs=request_kwargs,
             healthy_deployments=healthy_deployments,
             metadata_variable_name=self._get_metadata_variable_name_from_kwargs(request_kwargs),
+            request_deployments=request_deployments,
         )
 
         # narrow to whatever `self.routing_plugins` left in candidate_models
diff --git a/litellm/router_strategy/tag_based_routing.py b/litellm/router_strategy/tag_based_routing.py
index 541fdd19cff..4ca4c17f6f9 100644
--- a/litellm/router_strategy/tag_based_routing.py
+++ b/litellm/router_strategy/tag_based_routing.py
@@ -8,9 +8,11 @@ Use this to route requests between Teams
 """
 
 import re
-from collections.abc import Mapping, Sequence
+from collections.abc import Iterable, Mapping, Sequence
 from types import MappingProxyType
-from typing import TYPE_CHECKING, Any, Final, Literal, Protocol, overload
+from typing import TYPE_CHECKING, Any, Final, Literal, Protocol, TypedDict, overload
+
+from typing_extensions import ReadOnly
 
 from litellm._logging import verbose_logger
 from litellm.constants import CONSUMED_REQUEST_TAGS_METADATA_KEY, ROUTING_REQUEST_TAGS_METADATA_KEY
@@ -50,6 +52,10 @@ class _DeploymentLike(Protocol):
     def get(self, key: Literal["model_name"], /) -> object: ...
 
 
+class _DeploymentWithModelInfo(TypedDict, total=False):
+    model_info: ReadOnly[Mapping[str, object]]
+
+
 class _MetadataLike(Protocol):
     @overload
     def get(self, key: Literal["tags"], /) -> Sequence[str] | None: ...
@@ -279,13 +285,14 @@ def _unknown_required_tag_hides_an_answer(
 
 def _chain_allows_fail_open(
     healthy_deployments: _DeploymentPool,
+    request_deployments: Iterable[_DeploymentLike | _DeploymentWithModelInfo],
     excluded_set: frozenset[str],
     required_set: frozenset[str],
     routing_confirmed: frozenset[str],
 ) -> bool:
     if _unknown_required_tag_hides_an_answer(healthy_deployments, excluded_set, required_set, routing_confirmed):
         return False
-    return any((d.get("model_info") or {}).get("allow_fail_open") is True for d in healthy_deployments)
+    return any((d.get("model_info") or {}).get("allow_fail_open") is True for d in request_deployments)
 
 
 def _trusted_only_pool(
@@ -321,6 +328,7 @@ def _trusted_only_pool(
 
 
 def _resolve_or_fail_open(
+    request_deployments: Iterable[_DeploymentLike | _DeploymentWithModelInfo],
     pool: Sequence[_DeploymentLike],
     healthy_deployments: _DeploymentPool,
     excluded_set: frozenset[str],
@@ -333,7 +341,7 @@ def _resolve_or_fail_open(
 ) -> tuple[_DeploymentLike, ...]:
     if pool:
         return tuple(pool)
-    if _chain_allows_fail_open(healthy_deployments, excluded_set, required_set, routing_confirmed):
+    if _chain_allows_fail_open(healthy_deployments, request_deployments, excluded_set, required_set, routing_confirmed):
         # Fall open only within whatever still satisfies whichever constraints
         # trace back to key/team policy. A constraint with no inherited backing at
         # all (or, when inherited_tags is unavailable, any constraint at all) can
@@ -350,6 +358,7 @@ def _resolve_or_fail_open(
 
 
 def _resolve_constraint_only_pool(
+    request_deployments: Iterable[_DeploymentLike | _DeploymentWithModelInfo],
     healthy_deployments: _DeploymentPool,
     excluded_set: frozenset[str],
     required_set: frozenset[str],
@@ -365,6 +374,7 @@ def _resolve_constraint_only_pool(
         else _exclude_deployments(_default_tagged_pool(healthy_deployments), excluded_set)
     )
     return _resolve_or_fail_open(
+        request_deployments,
         pool,
         healthy_deployments,
         excluded_set,
@@ -480,6 +490,8 @@ async def get_deployments_for_tag(
     healthy_deployments: _DeploymentPool,
     request_kwargs: _RequestKwargsLike | None = None,
     metadata_variable_name: Literal["metadata", "litellm_metadata"] = "metadata",
+    *,
+    request_deployments: Iterable[_DeploymentLike | _DeploymentWithModelInfo],
 ) -> _DeploymentPool:
     """
     Returns a list of deployments that match the requested model and tags in the request.
@@ -548,6 +560,7 @@ async def get_deployments_for_tag(
 
         if constraint_only:
             return _resolve_constraint_only_pool(
+                request_deployments,
                 healthy_deployments,
                 excluded_set,
                 required_set,
@@ -599,6 +612,7 @@ async def get_deployments_for_tag(
 
             if len(new_healthy_deployments) == 0 and len(default_deployments) == 0:
                 return _resolve_or_fail_open(
+                    request_deployments,
                     (),
                     healthy_deployments,
                     excluded_set,
@@ -616,6 +630,7 @@ async def get_deployments_for_tag(
                 and _tag_known_to_group(llm_router_instance, model, positive_tags, routing_confirmed)
             ):
                 return _resolve_or_fail_open(
+                    request_deployments,
                     (),
                     healthy_deployments,
                     excluded_set,
diff --git a/litellm/router_utils/pre_call_checks/prompt_caching_deployment_check.py b/litellm/router_utils/pre_call_checks/prompt_caching_deployment_check.py
index b2f0c658161..435f9b9c5a4 100644
--- a/litellm/router_utils/pre_call_checks/prompt_caching_deployment_check.py
+++ b/litellm/router_utils/pre_call_checks/prompt_caching_deployment_check.py
@@ -138,6 +138,9 @@ class PromptCachingDeploymentCheck(CustomLogger):
 
         return healthy_deployments
 
+    def exempt_from_message_redaction(self) -> bool:
+        return True
+
     async def async_log_success_event(
         self,
         kwargs: _PromptCachingSuccessEventKwargs,
diff --git a/litellm/types/llms/anthropic.py b/litellm/types/llms/anthropic.py
index f113f833a46..53abac75162 100644
--- a/litellm/types/llms/anthropic.py
+++ b/litellm/types/llms/anthropic.py
@@ -807,6 +807,7 @@ class ANTHROPIC_BETA_HEADER_VALUES(str, Enum):
     ADVISOR_TOOL_2026_03_01 = "advisor-tool-2026-03-01"
     PER_TURN_CONTROL_2026_07_01 = "per-turn-control-2026-07-01"
     DANGEROUS_TOOL_USE_2026_09_03 = "dangerous-tool-use-2026-09-03"
+    MCP_CLIENT_2025_04_04 = "mcp-client-2025-04-04"
 
 
 # Tool search beta header constant (for Anthropic direct API and Microsoft Foundry)
diff --git a/litellm/types/llms/bedrock.py b/litellm/types/llms/bedrock.py
index ff4f2c4fd1e..e7bef9b3946 100644
--- a/litellm/types/llms/bedrock.py
+++ b/litellm/types/llms/bedrock.py
@@ -244,7 +244,7 @@ class ConverseTokenUsageBlock(TypedDict, total=False):
 
 
 class ServiceTierBlock(TypedDict):
-    type: Literal["priority", "default", "flex"]
+    type: Literal["priority", "default", "flex", "reserved"]
 
 
 class ConverseResponseBlock(TypedDict, total=False):
diff --git a/litellm/types/llms/gemini_audio_transcription.py b/litellm/types/llms/gemini_audio_transcription.py
index c1cf3452945..59dd15aa13e 100644
--- a/litellm/types/llms/gemini_audio_transcription.py
+++ b/litellm/types/llms/gemini_audio_transcription.py
@@ -75,7 +75,7 @@ class GeminiTranscriptionUsage(LiteLLMBaseModel):
 
 
 class GeminiTranscriptionInteractionResponse(LiteLLMBaseModel):
-    model_config = ConfigDict(extra="ignore")
+    model_config = ConfigDict(extra="ignore", hide_input_in_errors=True)
 
     id: str | None = None
     status: str | None = None
diff --git a/litellm/types/llms/vertex_ai_gemini_transcription.py b/litellm/types/llms/vertex_ai_gemini_transcription.py
index e78aafaca9f..d7bc136bcd1 100644
--- a/litellm/types/llms/vertex_ai_gemini_transcription.py
+++ b/litellm/types/llms/vertex_ai_gemini_transcription.py
@@ -68,7 +68,7 @@ class VertexGeminiTranscriptionUsageMetadata(LiteLLMBaseModel):
 
 
 class VertexGeminiTranscriptionResponse(LiteLLMBaseModel):
-    model_config = ConfigDict(extra="ignore")
+    model_config = ConfigDict(extra="ignore", hide_input_in_errors=True)
 
     candidates: tuple[VertexGeminiTranscriptionCandidate, ...] = ()
     usageMetadata: VertexGeminiTranscriptionUsageMetadata | None = None
diff --git a/litellm/types/llms/vertex_ai_speech_to_text.py b/litellm/types/llms/vertex_ai_speech_to_text.py
index f3d343d13ce..3dea7610150 100644
--- a/litellm/types/llms/vertex_ai_speech_to_text.py
+++ b/litellm/types/llms/vertex_ai_speech_to_text.py
@@ -40,6 +40,8 @@ class VertexSpeechToTextResponseMetadata(LiteLLMBaseModel):
 
 
 class VertexSpeechToTextRecognizeResponse(LiteLLMBaseModel):
+    model_config = ConfigDict(hide_input_in_errors=True)
+
     results: list[VertexSpeechToTextResult] = Field(default=[])
     metadata: VertexSpeechToTextResponseMetadata | None = None
 
diff --git a/litellm/types/utils.py b/litellm/types/utils.py
index 1b8190b1f09..bbe581d5e5b 100644
--- a/litellm/types/utils.py
+++ b/litellm/types/utils.py
@@ -213,6 +213,7 @@ class ProviderSpecificModelInfo(TypedDict, total=False):
     supports_legacy_thinking: ReadOnly[bool | None]
     thinking_always_on: ReadOnly[bool | None]
     supports_tool_search: bool | None
+    supports_per_turn_control: ReadOnly[bool | None]
     supports_mid_conversation_system: bool | None
     supports_url_context: bool | None
     supports_none_reasoning_effort: bool | None
@@ -654,6 +655,14 @@ class CallTypes(str, Enum):
     retrieve_fine_tuning_job = "retrieve_fine_tuning_job"
     responses = "responses"
     aresponses = "aresponses"
+    get_responses = "get_responses"
+    aget_responses = "aget_responses"
+    delete_responses = "delete_responses"
+    adelete_responses = "adelete_responses"
+    cancel_responses = "cancel_responses"
+    acancel_responses = "acancel_responses"
+    compact_responses = "compact_responses"
+    acompact_responses = "acompact_responses"
     alist_input_items = "alist_input_items"
     llm_passthrough_route = "llm_passthrough_route"
     allm_passthrough_route = "allm_passthrough_route"
@@ -755,6 +764,8 @@ CallTypesLiteral = Literal[
     "send_message",
     "aresponses",
     "responses",
+    "compact_responses",
+    "acompact_responses",
     "acreate_skill",
     "acreate_realtime_client_secret",
     "arealtime_calls",
@@ -2849,6 +2860,8 @@ class TranscriptionUsageTokensObject(LiteLLMBaseModel):
 
 
 class TranscriptionResponse(OpenAIObject):
+    model_config = ConfigDict(hide_input_in_errors=True)
+
     text: str | None = None
     usage: TranscriptionUsageDurationObject | TranscriptionUsageTokensObject | None = None
 
@@ -4083,7 +4096,11 @@ class CustomPricingLiteLLMParams(MirroredPricingParams):
 DEPLOYMENT_SCOPED_PRICING_FIELDS: Final[frozenset[str]] = frozenset({"off_peak_pricing"})
 
 DEPLOYMENT_SCOPED_CAPABILITY_FIELDS: Final[frozenset[str]] = frozenset(
-    {"supports_regex_lookaround", "supports_bedrock_native_structured_output"}
+    {
+        "supports_regex_lookaround",
+        "supports_bedrock_native_structured_output",
+        "supports_per_turn_control",
+    }
 )
 
 DEPLOYMENT_SCOPED_TOKEN_COUNT_FIELDS: Final[frozenset[str]] = frozenset({"token_count_framing", "token_count_model"})
diff --git a/litellm/utils.py b/litellm/utils.py
index 9c18e161247..da619a5aefe 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -93,7 +93,11 @@ from litellm.litellm_core_utils.get_model_cost_map import AliasedCostEntry
 from litellm.litellm_core_utils.model_param_helper import peek_reasoning_summary_aliases
 from litellm.litellm_core_utils.sensitive_data_masker import redact_credentials_in_payload
 from litellm.litellm_core_utils.tokenizer import strip_special_tokens
-from litellm.litellm_core_utils.tool_fields import MalformedField, resolve_deployment_tool_fields
+from litellm.litellm_core_utils.tool_fields import (
+    MalformedField,
+    resolve_deployment_tool_fields,
+    tools_without_hosted_mcp,
+)
 from litellm.rust_bridge import tokenizer as tokenizer_dispatch
 from litellm.rust_bridge.catalog import decision
 from litellm.rust_bridge.configuration import Decision
@@ -434,11 +438,11 @@ if TYPE_CHECKING:
     )
     from litellm.llms.cohere.common_utils import CohereModelInfo
     from litellm.llms.custom_httpx.http_handler import AsyncHTTPHandler, HTTPHandler
+    from litellm.llms.custom_llm import CustomLLM
     from litellm.router_utils.get_retry_from_policy import (
         get_num_retries_from_retry_policy,
         reset_retry_policy,
     )
-    from litellm.llms.custom_llm import CustomLLM
     from litellm.types.llms.anthropic import (
         ANTHROPIC_API_ONLY_HEADERS,
         AnthropicThinkingParam,
@@ -4690,7 +4694,12 @@ def remove_sensitive_keys_from_dict(d: dict) -> dict:
     return d
 
 
-def pre_process_optional_params(passed_params: dict, non_default_params: dict, custom_llm_provider: str) -> dict:
+_TOOL_LIST: Final = TypeAdapter(list[object])
+
+
+def pre_process_optional_params(
+    passed_params: dict, non_default_params: dict, custom_llm_provider: str, model: str, drop_params: bool | None
+) -> dict:
     """For .completion(), preprocess optional params"""
     optional_params: dict = {}
 
@@ -4747,14 +4756,20 @@ def pre_process_optional_params(passed_params: dict, non_default_params: dict, c
             and custom_llm_provider not in litellm.openai_compatible_providers
         ):
             if custom_llm_provider == "ollama":
+                if "tools" in non_default_params:
+                    sent_tools: Final = _TOOL_LIST.validate_python(non_default_params.pop("tools"))
+                    non_default_params.pop("tool_choice", None)  # causes ollama requests to hang
+                    prompt_tools: Final = tools_without_hosted_mcp(
+                        sent_tools, model=model, route=custom_llm_provider, drop_params=bool(drop_params)
+                    )
+                    if sent_tools and not prompt_tools:
+                        return optional_params
+                    optional_params["functions_unsupported_model"] = prompt_tools
+                elif "functions" in non_default_params:
+                    optional_params["functions_unsupported_model"] = non_default_params.pop("functions")
                 # ollama actually supports json output
                 optional_params["format"] = "json"
                 litellm.add_function_to_prompt = True  # so that main.py adds the function call to the prompt
-                if "tools" in non_default_params:
-                    optional_params["functions_unsupported_model"] = non_default_params.pop("tools")
-                    non_default_params.pop("tool_choice", None)  # causes ollama requests to hang
-                elif "functions" in non_default_params:
-                    optional_params["functions_unsupported_model"] = non_default_params.pop("functions")
             elif litellm.add_function_to_prompt:  # if user opts to add it to prompt instead
                 optional_params["functions_unsupported_model"] = non_default_params.pop(
                     "tools", non_default_params.pop("functions", None)
@@ -4843,6 +4858,8 @@ def get_optional_params(
         passed_params=passed_params,
         non_default_params=non_default_params,
         custom_llm_provider=custom_llm_provider,
+        model=model,
+        drop_params=drop_params,
     )
 
     def _check_valid_arg(supported_params: list[str]):
@@ -6755,6 +6772,7 @@ def get_model_info_helper(
                 supports_legacy_thinking=_model_info.get("supports_legacy_thinking", None),
                 thinking_always_on=_model_info.get("thinking_always_on", None),
                 supports_tool_search=_model_info.get("supports_tool_search", None),
+                supports_per_turn_control=_model_info.get("supports_per_turn_control", None),
                 supports_mid_conversation_system=_model_info.get("supports_mid_conversation_system", None),
                 supports_anthropic_thinking_payload=_model_info.get("supports_anthropic_thinking_payload", None),
                 supports_anthropic_compaction=_model_info.get("supports_anthropic_compaction", None),
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index 2c183527ce8..891e247747e 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -64002,6 +64002,15 @@
                     "supports_tool_search": true
                 }
             },
+            {
+                "name": "claude-per-turn-control",
+                "pattern": "claude-[a-z]+-(?:4[-._](?:[5-9]|[1-9]\\d)(?!\\d)|[5-9](?!\\d)(?:[-._]\\d{1,2}(?!\\d))?)",
+                "fill_missing_for_providers": ["bedrock", "bedrock_converse"],
+                "description": "Claude at version 4.5 or higher, with the same id shapes and version boundaries as claude-tool-search. On 2026-11-05 Bedrock InvokeModel answered 200 with the per-turn-control-2026-07-01 beta on every Claude 4.5 and newer model a QA account reached across 13 regions, and 400 invalid beta flag on Claude 3 Haiku in ca-central-1. The jp., au. and in. profiles answered 200 too, AWS lists no apac. profile for Claude 4.5 or newer, and GovCloud was not tested. Claude 3.5, 3.7, Sonnet 4, Opus 4 and Opus 4.1 were unreachable, so they keep the beta dropped as before. The flag means Bedrock accepts the beta name on the model, as supports_tool_search does for the tool search beta, and Bedrock Invoke forwards the beta only where it is set. It does not promise per-turn output_config works, since on 2026-11-05 Opus 4.8, Opus 5, Sonnet 5 and Fable 5 rejected it with or without the beta. A deployment turns the forward off with model_info supports_per_turn_control false.",
+                "model_info": {
+                    "supports_per_turn_control": true
+                }
+            },
             {
                 "name": "wandb-reasoning-baseline",
                 "pattern": "^wandb/",
diff --git a/tests/integration/_support/redaction_probe.py b/tests/integration/_support/redaction_probe.py
index 2a344daa73c..83d1cbd9cba 100644
--- a/tests/integration/_support/redaction_probe.py
+++ b/tests/integration/_support/redaction_probe.py
@@ -19,6 +19,7 @@ def _payload(kwargs: Mapping[str, object], response_obj: object) -> str:
             "request": request,
             "response": response_obj.model_dump() if isinstance(response_obj, BaseModel) else response_obj,
             "standard_response": standard.get("response") if isinstance(standard, Mapping) else None,
+            "standard": standard,
         },
         default=str,
     )
diff --git a/tests/integration/authorization/test_responses_lifecycle_during_call_guardrail.py b/tests/integration/authorization/test_responses_lifecycle_during_call_guardrail.py
new file mode 100644
index 00000000000..3227caaa7f5
--- /dev/null
+++ b/tests/integration/authorization/test_responses_lifecycle_during_call_guardrail.py
@@ -0,0 +1,114 @@
+"""GET, compact, DELETE and cancel on /v1/responses answer 200 when a during_call guardrail is on by default
+(LIT-9770): the hook used to raise `'acompact_responses' is not a valid CallTypes` and the proxy returned 500"""
+
+import json
+import uuid
+from collections.abc import Iterator
+from pathlib import Path
+from typing import Final
+
+import httpx
+import pytest
+import yaml
+from integration._support.client import Gateway, string_value
+from integration._support.process import owned_proxy
+from integration._support.provider import SharedProvider
+from integration._support.wire import Reply
+from pydantic import JsonValue, TypeAdapter
+
+pytestmark: Final = pytest.mark.shares_worker_state
+
+_JSON_OBJECT: Final = TypeAdapter(dict[str, JsonValue])
+_MODEL: Final = "openai/gpt-5.4-mini"
+
+
+def _input() -> list[JsonValue]:
+    return [
+        {"role": "user", "content": f"Remember the number {uuid.uuid4().hex}."},
+        {"role": "assistant", "content": "Got it."},
+    ]
+
+
+def _response(response_id: str) -> Reply:
+    body: Final[dict[str, JsonValue]] = {
+        "id": response_id,
+        "object": "response",
+        "created_at": 1,
+        "status": "completed",
+        "model": _MODEL.removeprefix("openai/"),
+        "output": [
+            {
+                "type": "message",
+                "id": f"msg_{uuid.uuid4().hex}",
+                "status": "completed",
+                "role": "assistant",
+                "content": [{"type": "output_text", "text": "Got it.", "annotations": []}],
+            }
+        ],
+        "parallel_tool_calls": False,
+        "tool_choice": "auto",
+        "tools": [],
+        "usage": {"input_tokens": 12, "output_tokens": 5, "total_tokens": 17},
+    }
+    return Reply(body=json.dumps(body).encode())
+
+
+def _deleted(response_id: str) -> Reply:
+    return Reply(body=json.dumps({"id": response_id, "object": "response.deleted", "deleted": True}).encode())
+
+
+def _guarded_config(path: Path) -> Path:
+    base: Final = _JSON_OBJECT.validate_python(yaml.safe_load(Path("tests/integration/proxy_config.yaml").read_text()))
+    guardrail: Final[dict[str, JsonValue]] = {
+        "guardrail_name": f"content-filter-{uuid.uuid4().hex}",
+        "litellm_params": {
+            "guardrail": "litellm_content_filter",
+            "mode": "during_call",
+            "default_on": True,
+            "blocked_words": [{"keyword": "forbiddenword", "action": "BLOCK"}],
+        },
+    }
+    path.write_text(yaml.safe_dump({**base, "guardrails": [guardrail]}))
+    return path
+
+
+@pytest.fixture(scope="module")
+def guarded(session_gateway: Gateway, tmp_path_factory: pytest.TempPathFactory) -> Iterator[Gateway]:
+    directory: Final = tmp_path_factory.mktemp("during-call-guardrail")
+    with owned_proxy(session_gateway, directory, {}, config=_guarded_config(directory / "config.yaml")) as candidate:
+        yield candidate
+
+
+def _create(guarded: Gateway, provider: SharedProvider, upstream_id: str) -> str:
+    provider.expect(_response(upstream_id))
+    created: Final = guarded.request("POST", "/v1/responses", {"model": _MODEL, "input": _input(), "store": True})
+    assert created.status_code == 200, created.text
+    (upstream,) = provider.received()
+    assert upstream.target.endswith("/responses"), upstream.target
+    return string_value(_JSON_OBJECT.validate_json(created.content)["id"])
+
+
+def _lifecycle(guarded: Gateway, provider: SharedProvider, operation: str) -> tuple[httpx.Response, str]:
+    if operation == "compact":
+        provider.expect(_response(f"resp_{uuid.uuid4().hex}"))
+        return guarded.request(
+            "POST", "/v1/responses/compact", {"model": _MODEL, "input": _input()}
+        ), "/responses/compact"
+    upstream_id: Final = f"resp_{uuid.uuid4().hex}"
+    managed_id: Final = _create(guarded, provider, upstream_id)
+    provider.expect(_deleted(upstream_id) if operation == "delete" else _response(upstream_id))
+    if operation == "get":
+        return guarded.request("GET", f"/v1/responses/{managed_id}"), f"/responses/{upstream_id}"
+    if operation == "delete":
+        return guarded.request("DELETE", f"/v1/responses/{managed_id}"), f"/responses/{upstream_id}"
+    return guarded.request("POST", f"/v1/responses/{managed_id}/cancel"), f"/responses/{upstream_id}/cancel"
+
+
+@pytest.mark.parametrize("operation", ["get", "compact", "delete", "cancel"])
+def test_responses_lifecycle_answers_200_with_a_during_call_guardrail_on(
+    guarded: Gateway, provider: SharedProvider, operation: str
+) -> None:
+    response, upstream_target = _lifecycle(guarded, provider, operation)
+    assert response.status_code == 200, response.text
+    (upstream,) = provider.received()
+    assert upstream.target.endswith(upstream_target), upstream.target
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index e82430c3add..7b0149fd2dd 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -68,6 +68,7 @@ def pytest_addoption(parser: pytest.Parser) -> None:
 def pytest_configure(config: pytest.Config) -> None:
     config.addinivalue_line("markers", "integration: owned real-service integration contracts")
     config.addinivalue_line("markers", "covers(*ids): legacy contract IDs kept for existing tests, not enforced")
+    config.addinivalue_line("markers", "shares_worker_state: owned proxies here share the worker DB and Redis")
     config.stash[REPORTS] = []
     config.stash[SHARD_FILES] = _shard_files(SHARD_PATH.validate_python(config.getoption("integration_shard_files")))
     config.pluginmanager.register(IntegrationReportPlugin(config))
diff --git a/tests/integration/routing/test_prompt_cache_pin_with_message_logging_off.py b/tests/integration/routing/test_prompt_cache_pin_with_message_logging_off.py
new file mode 100644
index 00000000000..13bf67582b3
--- /dev/null
+++ b/tests/integration/routing/test_prompt_cache_pin_with_message_logging_off.py
@@ -0,0 +1,95 @@
+import collections
+from collections.abc import Iterator
+from dataclasses import dataclass
+from typing import Final
+
+import pytest
+from integration._support.client import eventually, gateway_from_environment, object_value
+from integration._support.process import OwnedProxy, graceful_stop_seconds, owned_proxy_process
+from integration._support.redis_process import owned_redis
+from integration._support.wire import Reply, Wire, wire_server
+from integration.routing._prompt_cache_pin_support import (
+    DEFAULT_MARK,
+    anthropic_deployment,
+    ask_turn,
+    chat_body,
+    claude_peer,
+    new_marker,
+    one_new_pin,
+    pin_config,
+    post_chat,
+    read_pins,
+    system_turn,
+)
+from pydantic import JsonValue, TypeAdapter
+from redis import Redis
+
+from litellm.constants import REDACTED_BY_LITELLM
+
+pytestmark: Final = pytest.mark.timeout(2 * graceful_stop_seconds() + 300)
+
+_GROUP: Final = "pin-logging-off"
+_LEFT: Final = "pin-logging-off-left"
+_RIGHT: Final = "pin-logging-off-right"
+_FOLLOW_UPS: Final = 20
+_REDACTED_MESSAGES: Final = [{"role": "user", "content": REDACTED_BY_LITELLM}]
+_LOGGED_EVENT: Final = TypeAdapter(dict[str, JsonValue])
+
+
+@dataclass(frozen=True, slots=True)
+class _Rig:
+    owned: OwnedProxy
+    redis: "Redis[bytes]"
+    logger_sink: Wire
+
+
+@pytest.fixture(scope="module")
+def rig(tmp_path_factory: pytest.TempPathFactory) -> Iterator[_Rig]:
+    directory: Final = tmp_path_factory.mktemp("prompt-cache-pin-message-logging-off")
+    with (
+        gateway_from_environment() as gateway,
+        owned_redis(directory) as cache,
+        wire_server(claude_peer) as left,
+        wire_server(claude_peer) as right,
+        wire_server(lambda request: Reply()) as logger_sink,
+    ):
+        config: Final = pin_config(
+            directory,
+            [anthropic_deployment(_GROUP, _LEFT, left.url), anthropic_deployment(_GROUP, _RIGHT, right.url)],
+            litellm_settings={
+                "turn_off_message_logging": True,
+                "callbacks": ["integration._support.redaction_probe.probe"],
+                "cache": False,
+                "enable_redis_auth_cache": False,
+            },
+        )
+        environment: Final = {
+            "REDIS_HOST": cache.host,
+            "REDIS_PORT": str(cache.port),
+            "REDACTION_PROBE_URL": logger_sink.url,
+        }
+        with (
+            owned_proxy_process(gateway, directory, environment, config=config, workers=1) as owned,
+            Redis(host=cache.host, port=cache.port, socket_timeout=2) as redis,
+        ):
+            yield _Rig(owned, redis, logger_sink)
+
+
+def test_follow_ups_stay_on_the_first_deployment_while_the_logger_sees_redacted_messages(rig: _Rig) -> None:
+    before: Final = frozenset(read_pins(rig.redis))
+    body: Final = chat_body(_GROUP, [system_turn(new_marker(), DEFAULT_MARK), ask_turn(new_marker())])
+
+    _, first_served = post_chat(rig.owned.gateway, body)
+    _, pin = one_new_pin(rig.redis, before)
+    assert pin.model_id == first_served, (pin, first_served)
+
+    served: Final = tuple(post_chat(rig.owned.gateway, body)[1] for _ in range(_FOLLOW_UPS))
+    assert served == (first_served,) * _FOLLOW_UPS, collections.Counter(served)
+
+    eventually(rig.logger_sink.received.qsize, lambda count: count >= 1 + _FOLLOW_UPS, seconds=30)
+    logged: Final = tuple(
+        object_value(_LOGGED_EVENT.validate_json(request.body)["standard"])["messages"]
+        for request in rig.logger_sink.drain()
+    )
+    assert len(logged) == 1 + _FOLLOW_UPS, len(logged)
+    assert all(messages == _REDACTED_MESSAGES for messages in logged), logged
diff --git a/tests/unit/completion_extras/litellm_responses_transformation/test_completion_extras_litellm_responses_transformation_transformation.py b/tests/unit/completion_extras/litellm_responses_transformation/test_completion_extras_litellm_responses_transformation_transformation.py
index 83c59480d37..eb308a2c513 100644
--- a/tests/unit/completion_extras/litellm_responses_transformation/test_completion_extras_litellm_responses_transformation_transformation.py
+++ b/tests/unit/completion_extras/litellm_responses_transformation/test_completion_extras_litellm_responses_transformation_transformation.py
@@ -1291,6 +1291,51 @@ def test_transform_request_system_only_message_maps_to_system_input_item():
     assert not result.get("instructions")
 
 
+_JSON_SYSTEM_PROMPT: Final = "You output JSON objects."
+_PLAIN_USER_ITEM: Final = {
+    "type": "message",
+    "role": "user",
+    "content": [{"type": "input_text", "text": "List three colors."}],
+}
+_COLORS_SCHEMA: Final = {
+    "type": "json_schema",
+    "json_schema": {"name": "colors", "schema": {"type": "object", "properties": {}}},
+}
+
+
+@pytest.mark.parametrize(
+    ("response_format", "expected_input", "expected_instructions"),
+    [
+        (
+            {"type": "json_object"},
+            [
+                {"type": "message", "role": "system", "content": [{"type": "input_text", "text": _JSON_SYSTEM_PROMPT}]},
+                _PLAIN_USER_ITEM,
+            ],
+            None,
+        ),
+        (_COLORS_SCHEMA, [_PLAIN_USER_ITEM], _JSON_SYSTEM_PROMPT),
+    ],
+    ids=["json_object_keeps_system_in_input", "json_schema_keeps_system_in_instructions"],
+)
+def test_transform_request_json_object_keeps_system_prompt_where_the_json_word_check_reads_it(
+    response_format, expected_input, expected_instructions
+):
+    result = LiteLLMResponsesTransformationHandler().transform_request(
+        model="gpt-5.4-mini",
+        messages=[
+            {"role": "system", "content": _JSON_SYSTEM_PROMPT},
+            {"role": "user", "content": "List three colors."},
+        ],
+        optional_params={"response_format": response_format},
+        litellm_params={},
+        headers={},
+        litellm_logging_obj=Mock(),
+    )
+
+    assert (result["input"], result.get("instructions")) == (expected_input, expected_instructions), result
+
+
 def test_transform_request_single_char_keys_not_matched():
     """Test that single-character keys are not incorrectly matched to 'metadata' or 'previous_response_id'
 
diff --git a/tests/unit/litellm_core_utils/llm_response_utils/test_convert_dict_to_response.py b/tests/unit/litellm_core_utils/llm_response_utils/test_convert_dict_to_response.py
index 0c601a6b2c8..4b341562709 100644
--- a/tests/unit/litellm_core_utils/llm_response_utils/test_convert_dict_to_response.py
+++ b/tests/unit/litellm_core_utils/llm_response_utils/test_convert_dict_to_response.py
@@ -2695,6 +2695,24 @@ class TestConvertToModelResponseObjectAudioTranscription:
         assert result.usage.output_tokens == 5
         assert result.usage.input_token_details.audio_tokens == 4
 
+    def test_parse_error_keeps_the_transcript_out_of_the_exception(self):
+        import traceback
+
+        from litellm.types.utils import TranscriptionResponse
+
+        transcript: Final = "CANARYTRANSCRIPT customer account ending 2750"
+
+        with pytest.raises(Exception, match="Invalid response object") as exc_info:
+            convert_to_model_response_object(
+                response_object={"text": transcript, "usage": {"type": "duration", "seconds": "not-a-number"}},
+                model_response_object=TranscriptionResponse(),
+                response_type="audio_transcription",
+            )
+
+        rendered: Final = "".join(traceback.format_exception(exc_info.value))
+        assert "received_args=" in rendered
+        assert "CANARYTRANSCRIPT" not in rendered
+
 class TestConvertToModelResponseObjectRerank:
     def test_basic_rerank(self):
         from litellm.types.utils import RerankResponse
diff --git a/tests/unit/litellm_core_utils/test_streaming_chunk_builder_utils.py b/tests/unit/litellm_core_utils/test_streaming_chunk_builder_utils.py
index a46c8bed4ad..716c0af236c 100644
--- a/tests/unit/litellm_core_utils/test_streaming_chunk_builder_utils.py
+++ b/tests/unit/litellm_core_utils/test_streaming_chunk_builder_utils.py
@@ -18,7 +18,6 @@ from litellm.types.utils import (
     ChatCompletionMessageToolCall,
     Delta,
     Function,
-    GenericStreamingChunk,
     ModelResponseStream,
     PromptTokensDetails,
     ServerToolUse,
diff --git a/tests/unit/litellm_core_utils/test_tool_fields.py b/tests/unit/litellm_core_utils/test_tool_fields.py
index 23d7de98fbc..a99278d18dd 100644
--- a/tests/unit/litellm_core_utils/test_tool_fields.py
+++ b/tests/unit/litellm_core_utils/test_tool_fields.py
@@ -1,4 +1,5 @@
 import datetime
+import logging
 from collections.abc import Callable, Mapping
 from typing import Final
 
@@ -6,7 +7,13 @@ import pytest
 
 import litellm
 from litellm import Router
+from litellm._logging import verbose_logger
 from litellm.litellm_core_utils.litellm_logging import Logging
+from litellm.litellm_core_utils.tool_fields import (
+    tool_params_without_hosted_mcp,
+    tools_without_hosted_mcp,
+    tools_without_mcp_servers,
+)
 from litellm.utils import async_pre_call_deployment_hook
 
 _GOOD_TOOL: Final = {"type": "function", "function": {"name": "get_weather", "parameters": {"type": "object"}}}
@@ -185,3 +192,92 @@ async def test_tools_core_accepts_reach_the_deployment(tools: object) -> None:
     sent: Final = await async_pre_call_deployment_hook(dict(_proxy_request("keeps", tools=tools)), "acompletion")
 
     assert sent["tools"] is tools
+
+
+def test_a_hosted_mcp_error_names_every_server_and_marks_an_unlabeled_one(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.UnsupportedParamsError) as raised:
+        tools_without_hosted_mcp(
+            tools=[
+                {"type": "mcp", "server_label": "deepwiki", "server_url": "https://mcp.deepwiki.com/mcp"},
+                {"type": "mcp", "server_url": "https://mcp.example.com/mcp"},
+            ],
+            model="gemini-3.8-flash",
+            route="gemini",
+            drop_params=False,
+        )
+    assert "the hosted MCP tool `deepwiki`, `unlabeled` " in str(raised.value)
+
+
+_HOSTED_MCP_TOOL: Final = {"type": "mcp", "server_label": "deepwiki", "server_url": "https://mcp.deepwiki.com/mcp"}
+
+
+def test_dropping_a_hosted_mcp_tool_keeps_the_other_tool_params_and_leaves_the_caller_dict_alone() -> None:
+    tool_choice: Final = {"type": "function", "function": {"name": "get_weather"}}
+    sent: Final = {
+        "tools": [_HOSTED_MCP_TOOL, _GOOD_TOOL],
+        "tool_choice": tool_choice,
+        "parallel_tool_calls": False,
+        "temperature": 0.2,
+    }
+    params: Final = tool_params_without_hosted_mcp(sent, model="deepseek-v4-flash", route="deepseek", drop_params=True)
+
+    assert params == {
+        "tools": [_GOOD_TOOL],
+        "tool_choice": tool_choice,
+        "parallel_tool_calls": False,
+        "temperature": 0.2,
+    }
+    assert sent["tools"] == [_HOSTED_MCP_TOOL, _GOOD_TOOL]
+
+
+def test_dropping_every_hosted_mcp_tool_clears_the_tool_selection_params() -> None:
+    params: Final = tool_params_without_hosted_mcp(
+        {"tools": [_HOSTED_MCP_TOOL], "tool_choice": "required", "parallel_tool_calls": True, "temperature": 0.2},
+        model="deepseek-v4-flash",
+        route="deepseek",
+        drop_params=True,
+    )
+
+    assert params == {"temperature": 0.2}
+
+
+class _Records(logging.Handler):
+    def __init__(self) -> None:
+        super().__init__(level=logging.WARNING)
+        self.messages: Final[list[str]] = []
+
+    def emit(self, record: logging.LogRecord) -> None:
+        self.messages.append(record.getMessage())
+
+
+@pytest.mark.parametrize(
+    "drop",
+    [
+        lambda model: tools_without_hosted_mcp(
+            [{"type": "mcp", "server_label": "wiki\r\nFORGED", "server_url": "https://mcp.example.com/mcp"}],
+            model=model,
+            route="deepseek",
+            drop_params=True,
+        ),
+        lambda model: tools_without_mcp_servers(
+            [{"type": "url", "name": "wiki\r\nFORGED", "url": "https://mcp.example.com/mcp"}],
+            tools=[],
+            model=model,
+            route="bedrock",
+            drop_params=True,
+        ),
+    ],
+    ids=["hosted_mcp_tool", "mcp_servers"],
+)
+def test_a_drop_warning_stays_on_one_log_line(drop: Callable[[str], object]) -> None:
+    records: Final = _Records()
+    verbose_logger.addHandler(records)
+    try:
+        drop("deepseek-v4-flash\nFORGED level=CRITICAL")
+    finally:
+        verbose_logger.removeHandler(records)
+
+    assert len(records.messages) == 1
+    assert "\n" not in records.messages[0] and "\r" not in records.messages[0]
+    assert "FORGED level=CRITICAL" in records.messages[0]
diff --git a/tests/unit/llms/anthropic/chat/test_anthropic_chat_transformation.py b/tests/unit/llms/anthropic/chat/test_anthropic_chat_transformation.py
index 36e6200315f..1edec9bc5e6 100644
--- a/tests/unit/llms/anthropic/chat/test_anthropic_chat_transformation.py
+++ b/tests/unit/llms/anthropic/chat/test_anthropic_chat_transformation.py
@@ -9728,3 +9728,82 @@ def test_transform_request_tool_config_point_without_tools_drops_the_key():
     assert "cache_control_injection_points" not in data
     assert "tools" not in data
     assert litellm_params["metadata"] == {}
+
+
+_HOSTED_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_FUNCTION_TOOL: Final = {
+    "type": "function",
+    "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {}}},
+}
+_ROUTES_WITHOUT_THE_MCP_CONNECTOR: Final = (
+    pytest.param(AmazonAnthropicClaudeConfig, "bedrock", id="bedrock_invoke"),
+    pytest.param(VertexAIAnthropicConfig, "vertex_ai", id="vertex_ai"),
+)
+
+
+@pytest.mark.parametrize("config_class", [AnthropicConfig, AzureAnthropicConfig, BedrockClaudePlatformConfig])
+def test_routes_with_the_mcp_connector_send_a_hosted_mcp_tool_as_an_mcp_server(monkeypatch, config_class):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = config_class().map_openai_params(
+        non_default_params={"tools": [_WEATHER_FUNCTION_TOOL, _HOSTED_MCP_TOOL]},
+        optional_params={},
+        model="claude-haiku-5-5",
+        drop_params=False,
+    )
+    assert [server["url"] for server in mapped["mcp_servers"]] == [_HOSTED_MCP_TOOL["server_url"]]
+    assert [tool["name"] for tool in mapped["tools"]] == ["get_weather"]
+
+
+@pytest.mark.parametrize(("config_class", "route"), _ROUTES_WITHOUT_THE_MCP_CONNECTOR)
+def test_a_hosted_mcp_tool_answers_400_on_claude_routes_without_the_mcp_connector(monkeypatch, config_class, route):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as raised:
+        config_class().map_openai_params(
+            non_default_params={"tools": [_WEATHER_FUNCTION_TOOL, _HOSTED_MCP_TOOL]},
+            optional_params={},
+            model="claude-haiku-5-5",
+            drop_params=False,
+        )
+    assert raised.value.status_code == 400
+    assert f"claude-haiku-5-5 on {route} " in str(raised.value)
+    assert "`deepwiki`" in str(raised.value)
+
+
+@pytest.mark.parametrize(("config_class", "route"), _ROUTES_WITHOUT_THE_MCP_CONNECTOR)
+def test_claude_routes_without_the_mcp_connector_drop_a_hosted_mcp_tool_under_drop_params(
+    monkeypatch, caplog, config_class, route
+):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with caplog.at_level("WARNING"):
+        mapped: Final = config_class().map_openai_params(
+            non_default_params={"tools": [_HOSTED_MCP_TOOL, _WEATHER_FUNCTION_TOOL]},
+            optional_params={},
+            model="claude-haiku-5-5",
+            drop_params=True,
+        )
+    assert [tool["name"] for tool in mapped["tools"]] == ["get_weather"]
+    assert "mcp_servers" not in mapped
+    assert any(
+        "`deepwiki`" in record.getMessage() and f" on {route} (" in record.getMessage() for record in caplog.records
+    )
+
+
+@pytest.mark.parametrize(("config_class", "route"), _ROUTES_WITHOUT_THE_MCP_CONNECTOR)
+def test_claude_routes_without_the_mcp_connector_send_no_tools_when_drop_params_drops_every_one(
+    monkeypatch, config_class, route
+):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = config_class().map_openai_params(
+        non_default_params={"tools": [_HOSTED_MCP_TOOL], "tool_choice": "required"},
+        optional_params={},
+        model="claude-haiku-5-5",
+        drop_params=True,
+    )
+    assert "tools" not in mapped
+    assert "mcp_servers" not in mapped
+    assert "tool_choice" not in mapped
diff --git a/tests/unit/llms/anthropic/pass_through/adapters/test_handler_output_config_passthrough.py b/tests/unit/llms/anthropic/pass_through/adapters/test_handler_output_config_passthrough.py
index 03553e65ad4..55287fa070d 100644
--- a/tests/unit/llms/anthropic/pass_through/adapters/test_handler_output_config_passthrough.py
+++ b/tests/unit/llms/anthropic/pass_through/adapters/test_handler_output_config_passthrough.py
@@ -27,11 +27,14 @@ Tests cover (consolidating PRs #23706 and #22727):
 
 import os
 import sys
+from collections.abc import Mapping
 from typing import Final
 from unittest.mock import MagicMock, patch
 
 import pytest
 
+import litellm
+
 # Anchor sys.path to this file's location — not the working-directory-relative
 # pattern Greptile flagged on PR #23706. Resolves correctly regardless of
 # where pytest is invoked from.
@@ -67,8 +70,8 @@ def _call_prepare(extra_kwargs, model="gpt-4o", output_format=None, **overrides)
         system=None,
         temperature=None,
         thinking=None,
-        tool_choice=None,
-        tools=None,
+        tool_choice=overrides.get("tool_choice"),
+        tools=overrides.get("tools"),
         top_k=None,
         top_p=None,
         output_format=output_format,
@@ -263,3 +266,112 @@ async def test_messages_layer_converted_stream_flag_still_gets_a_message_back(co
     )
 
     assert response["content"][0]["text"] == "hi"
+
+
+_DEEPWIKI_SERVER: Final = {"type": "url", "url": "https://mcp.deepwiki.com/mcp", "name": "deepwiki"}
+
+
+@pytest.mark.parametrize(
+    ("mcp_servers", "named"),
+    [
+        ([_DEEPWIKI_SERVER], "`deepwiki`"),
+        ([_DEEPWIKI_SERVER, {"type": "url", "url": "https://mcp.example.com/mcp"}], "`deepwiki`, `unnamed`"),
+        ({"name": "deepwiki"}, "`unnamed`"),
+    ],
+    ids=["named", "one-unnamed", "not-a-list"],
+)
+def test_mcp_servers_a_chat_route_cannot_run_answer_400_naming_each_server(
+    monkeypatch: pytest.MonkeyPatch, mcp_servers: object, named: str
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.UnsupportedParamsError) as raised:
+        _call_prepare(
+            extra_kwargs={"mcp_servers": mcp_servers, "custom_llm_provider": "gemini"}, model="gemini-3.8-flash"
+        )
+
+    assert raised.value.status_code == 400
+    assert f"to gemini-3.8-flash on gemini, so the MCP server {named} would not run" in str(raised.value)
+
+
+@pytest.mark.parametrize(
+    ("route", "forwards"),
+    [("litellm_proxy", True), ("hosted_vllm", True), ("bedrock", False), ("vertex_ai", False)],
+)
+def test_mcp_servers_reach_routes_that_carry_them_and_answer_400_elsewhere(
+    monkeypatch: pytest.MonkeyPatch, route: str, forwards: bool
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    extra_kwargs: Final = {"mcp_servers": [_DEEPWIKI_SERVER], "custom_llm_provider": route}
+    if not forwards:
+        with pytest.raises(litellm.UnsupportedParamsError, match=f"on {route}, so the MCP server `deepwiki`"):
+            _call_prepare(extra_kwargs=extra_kwargs, model="some-model")
+        return
+
+    completion_kwargs, _ = _call_prepare(extra_kwargs=extra_kwargs, model="some-model")
+
+    assert completion_kwargs["mcp_servers"] == [_DEEPWIKI_SERVER]
+
+
+_DEEPWIKI_TOOLSET: Final = {"type": "mcp_toolset", "mcp_server_name": "deepwiki"}
+_WEATHER_TOOL: Final = {
+    "name": "get_weather",
+    "description": "Get the weather for a city",
+    "input_schema": {"type": "object", "properties": {"city": {"type": "string"}}},
+}
+
+
+@pytest.mark.parametrize(
+    ("tools", "kept_tool_names"),
+    [([_DEEPWIKI_TOOLSET, _WEATHER_TOOL], ["get_weather"]), ([_DEEPWIKI_TOOLSET], None)],
+    ids=["with-function", "toolset-only"],
+)
+def test_drop_params_drops_the_mcp_toolset_tools_of_dropped_mcp_servers(
+    monkeypatch: pytest.MonkeyPatch, tools: list[dict[str, object]], kept_tool_names: list[str] | None
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", True)
+    completion_kwargs, _ = _call_prepare(
+        extra_kwargs={"mcp_servers": [_DEEPWIKI_SERVER], "custom_llm_provider": "gemini"},
+        model="gemini-3.8-flash",
+        tools=tools,
+        tool_choice={"type": "auto"},
+    )
+
+    sent_tools: Final = completion_kwargs.get("tools")
+    sent_names: Final = [tool["function"]["name"] for tool in sent_tools] if sent_tools else None
+    assert sent_names == kept_tool_names
+    assert ("tool_choice" in completion_kwargs) == bool(kept_tool_names)
+
+
+_DROP_FORMS: Final[Mapping[str, Mapping[str, object]]] = {
+    "request": {"drop_params": True},
+    "global": {},
+    "additional_drop_params": {"additional_drop_params": ["mcp_servers"]},
+}
+
+
+@pytest.mark.parametrize("drop_params", list(_DROP_FORMS))
+def test_drop_params_drops_mcp_servers_instead_of_forwarding_them(
+    monkeypatch: pytest.MonkeyPatch, drop_params: str
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", drop_params == "global")
+    completion_kwargs, _ = _call_prepare(
+        extra_kwargs={
+            "mcp_servers": [_DEEPWIKI_SERVER],
+            "custom_llm_provider": "gemini",
+            **_DROP_FORMS[drop_params],
+        },
+        model="gemini-3.8-flash",
+    )
+
+    assert "mcp_servers" not in completion_kwargs
+    assert completion_kwargs["messages"] == MESSAGES
+
+
+@pytest.mark.parametrize("mcp_servers", [None, []], ids=["absent", "empty"])
+def test_no_mcp_servers_needs_no_drop_params(monkeypatch: pytest.MonkeyPatch, mcp_servers: object) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    completion_kwargs, _ = _call_prepare(
+        extra_kwargs={"mcp_servers": mcp_servers, "custom_llm_provider": "gemini"}, model="gemini-3.8-flash"
+    )
+
+    assert "mcp_servers" not in completion_kwargs
diff --git a/tests/unit/llms/anthropic/pass_through/responses_adapters/test_responses_adapters_handler.py b/tests/unit/llms/anthropic/pass_through/responses_adapters/test_responses_adapters_handler.py
index 453429df084..6aec78bdb97 100644
--- a/tests/unit/llms/anthropic/pass_through/responses_adapters/test_responses_adapters_handler.py
+++ b/tests/unit/llms/anthropic/pass_through/responses_adapters/test_responses_adapters_handler.py
@@ -633,3 +633,54 @@ async def test_recomputed_cost_of_a_served_bridge_response_prices_the_reasoning_
     assert logging_obj.cost_breakdown is not None
     assert logging_obj.cost_breakdown["output_cost"] == pytest.approx(expected_output)
     assert logging_obj.cost_breakdown["reasoning_cost"] == pytest.approx(expected_reasoning)
+
+
+_DEEPWIKI_SERVER: Final = {"type": "url", "url": "https://mcp.deepwiki.com/mcp", "name": "deepwiki"}
+
+
+def test_mcp_servers_the_responses_bridge_cannot_run_answer_400(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.UnsupportedParamsError) as rejected:
+        _build_responses_kwargs(
+            model="gpt-5.6",
+            extra_kwargs={**OPENAI_API, "mcp_servers": [_DEEPWIKI_SERVER]},
+            max_tokens=1024,
+            messages=MESSAGES,
+        )
+
+    assert rejected.value.status_code == 400
+    assert "to gpt-5.6 on openai, so the MCP server `deepwiki` would not run" in rejected.value.message
+
+
+@pytest.mark.parametrize(
+    "drop_form",
+    [{"drop_params": True}, {"additional_drop_params": ["mcp_servers"]}],
+    ids=["drop_params", "additional_drop_params"],
+)
+def test_drop_params_keeps_mcp_servers_off_the_responses_request(
+    monkeypatch: pytest.MonkeyPatch, drop_form: Mapping[str, object]
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    responses_kwargs: Final = _build_responses_kwargs(
+        model="gpt-5.6",
+        extra_kwargs={**OPENAI_API, "mcp_servers": [_DEEPWIKI_SERVER], **drop_form},
+        max_tokens=1024,
+        messages=MESSAGES,
+    )
+
+    assert "mcp_servers" not in responses_kwargs
+    assert responses_kwargs["input"]
+
+
+def test_drop_params_drops_the_mcp_toolset_tools_of_dropped_mcp_servers(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    weather_tool: Final = {"name": "get_weather", "input_schema": {"type": "object", "properties": {}}}
+    responses_kwargs: Final = _build_responses_kwargs(
+        model="gpt-5.6",
+        extra_kwargs={**OPENAI_API, "mcp_servers": [_DEEPWIKI_SERVER], "drop_params": True},
+        max_tokens=1024,
+        messages=MESSAGES,
+        tools=[{"type": "mcp_toolset", "mcp_server_name": "deepwiki"}, weather_tool],
+    )
+
+    assert [tool["name"] for tool in responses_kwargs["tools"]] == ["get_weather"]
diff --git a/tests/unit/llms/azure/test_azure_common_utils.py b/tests/unit/llms/azure/test_azure_common_utils.py
index b277cac1f29..98e3b84ff24 100644
--- a/tests/unit/llms/azure/test_azure_common_utils.py
+++ b/tests/unit/llms/azure/test_azure_common_utils.py
@@ -456,6 +456,10 @@ def test_default_max_retries_env_var_reaches_azure_sdk_client():
             "add_message",
             "arun_thread_stream",
             "aresponses",
+            "aget_responses",
+            "adelete_responses",
+            "acancel_responses",
+            "acompact_responses",
             "aresponses_websocket",
             "alist_input_items",
             "acreate_fine_tuning_job",
diff --git a/tests/unit/llms/bedrock/chat/test_converse_transformation.py b/tests/unit/llms/bedrock/chat/test_converse_transformation.py
index 49d99f7123e..69269e31e0b 100644
--- a/tests/unit/llms/bedrock/chat/test_converse_transformation.py
+++ b/tests/unit/llms/bedrock/chat/test_converse_transformation.py
@@ -10813,3 +10813,67 @@ def test_a_refused_native_schema_is_sent_again_only_when_the_retry_drops_native_
     assert route.call_count == expected_calls
     assert all("outputConfig" in json.loads(call.request.content) for call in route.calls[:1])
     assert all("outputConfig" not in json.loads(call.request.content) for call in route.calls[1:])
+
+
+_HOSTED_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_FUNCTION_TOOL: Final = {
+    "type": "function",
+    "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {}}},
+}
+
+
+def _converse_request_for_tools(
+    model: str, non_default_params: Mapping[str, object], drop_params: bool
+) -> Mapping[str, object]:
+    config: Final = AmazonConverseConfig()
+    return config._transform_request_helper(
+        model=model,
+        system_content_blocks=[],
+        optional_params=config.map_openai_params(
+            non_default_params=dict(non_default_params), optional_params={}, model=model, drop_params=drop_params
+        ),
+        messages=[{"role": "user", "content": "hi"}],
+    )
+
+
+@pytest.mark.parametrize(
+    "model", ["us.openai.gpt-oss-120b-1:0", "us.anthropic.claude-haiku-5-5", "us.amazon.nova-2-lite-v1:0"]
+)
+def test_a_hosted_mcp_tool_answers_400_on_converse_without_drop_params(monkeypatch, model):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as raised:
+        _converse_request_for_tools(model, {"tools": [_WEATHER_FUNCTION_TOOL, _HOSTED_MCP_TOOL]}, drop_params=False)
+    assert raised.value.status_code == 400
+    assert model in str(raised.value)
+    assert "`deepwiki`" in str(raised.value)
+    assert 'server_url: "litellm_proxy/mcp/<server name>"' in str(raised.value)
+    assert "drop_params: true" in str(raised.value)
+
+
+def test_converse_drops_a_hosted_mcp_tool_under_drop_params_and_keeps_the_function_tool(monkeypatch, caplog):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    model: Final = "us.openai.gpt-oss-120b-1:0"
+    with caplog.at_level("WARNING"):
+        request: Final = _converse_request_for_tools(
+            model, {"tools": [_HOSTED_MCP_TOOL, _WEATHER_FUNCTION_TOOL]}, drop_params=True
+        )
+    assert [tool["toolSpec"]["name"] for tool in request["toolConfig"]["tools"]] == ["get_weather"]
+    assert any(
+        "`deepwiki`" in record.getMessage() and f"model={model} on bedrock (" in record.getMessage()
+        for record in caplog.records
+    )
+
+
+def test_converse_sends_no_tools_when_drop_params_drops_every_hosted_mcp_tool(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    request: Final = _converse_request_for_tools(
+        "us.openai.gpt-oss-120b-1:0", {"tools": [_HOSTED_MCP_TOOL], "tool_choice": "auto"}, drop_params=True
+    )
+    assert "toolConfig" not in request
+    assert "toolChoice" not in json.dumps(request)
+    assert "tool_choice" not in json.dumps(request)
diff --git a/tests/unit/llms/bedrock/chat/test_service_tier.py b/tests/unit/llms/bedrock/chat/test_service_tier.py
index ce9dc4d745e..e248a64fba4 100644
--- a/tests/unit/llms/bedrock/chat/test_service_tier.py
+++ b/tests/unit/llms/bedrock/chat/test_service_tier.py
@@ -3,11 +3,13 @@ Tests for Bedrock Converse API serviceTier support.
 """
 
 import json
+from unittest.mock import MagicMock
 
 import pytest
 
-
+import litellm
 from litellm.llms.bedrock.chat.converse_transformation import AmazonConverseConfig
+from litellm.llms.custom_httpx.http_handler import HTTPHandler
 from litellm.types.llms.bedrock import ServiceTierBlock
 
 
@@ -201,11 +203,8 @@ def test_map_openai_service_tier_flex():
     assert result["serviceTier"] == {"type": "flex"}
 
 
-def test_map_openai_service_tier_auto_maps_to_default():
-    """Test that OpenAI service_tier='auto' maps to Bedrock serviceTier='default'.
-
-    Bedrock doesn't support 'auto', so we map it to 'default'.
-    """
+def test_map_openai_service_tier_auto_sends_no_tier():
+    """`auto` picks no tier, so Bedrock gets no serviceTier and serves its own default."""
     config = AmazonConverseConfig()
 
     result = config.map_openai_params(
@@ -215,10 +214,123 @@ def test_map_openai_service_tier_auto_maps_to_default():
         drop_params=False,
     )
 
-    assert "serviceTier" in result
+    assert "serviceTier" not in result
+
+
+def test_map_openai_service_tier_none_sends_no_tier():
+    config = AmazonConverseConfig()
+
+    result = config.map_openai_params(
+        non_default_params={"service_tier": None},
+        optional_params={},
+        model="anthropic.claude-3-sonnet-20240229-v1:0",
+        drop_params=False,
+    )
+
+    assert "serviceTier" not in result
+
+
+def test_map_openai_service_tier_reserved_reaches_the_request():
+    config = AmazonConverseConfig()
+    model = "anthropic.claude-3-sonnet-20240229-v1:0"
+
+    optional_params = config.map_openai_params(
+        non_default_params={"service_tier": "reserved"},
+        optional_params={},
+        model=model,
+        drop_params=False,
+    )
+    request = config.transform_request(
+        model=model,
+        messages=[{"role": "user", "content": "Hello!"}],
+        optional_params=optional_params,
+        litellm_params={},
+        headers={},
+    )
+
+    assert request["serviceTier"] == {"type": "reserved"}
+
+
+def test_map_openai_service_tier_standard_only_maps_to_default():
+    """`standard_only` is the Anthropic Messages value that means Bedrock's Standard tier."""
+    config = AmazonConverseConfig()
+
+    result = config.map_openai_params(
+        non_default_params={"service_tier": "standard_only"},
+        optional_params={},
+        model="anthropic.claude-3-sonnet-20240229-v1:0",
+        drop_params=False,
+    )
+
     assert result["serviceTier"] == {"type": "default"}
 
 
+@pytest.mark.parametrize("value", ["ultrafast", "fast", "scale", "", {"type": "priority"}, ["fast"], 1])
+def test_map_openai_service_tier_unmapped_value_answers_400(value):
+    config = AmazonConverseConfig()
+    optional_params = {}
+
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as error:
+        config.map_openai_params(
+            non_default_params={"service_tier": value},
+            optional_params=optional_params,
+            model="anthropic.claude-3-sonnet-20240229-v1:0",
+            drop_params=False,
+        )
+
+    assert error.value.status_code == 400
+    assert f"service_tier={value!r}" in error.value.message
+    assert "drop_params" in error.value.message
+    assert "serviceTier" not in optional_params
+
+
+@pytest.mark.parametrize("value", ["ultrafast", {"type": "priority"}])
+def test_map_openai_service_tier_unmapped_value_drops_under_request_drop_params(value):
+    config = AmazonConverseConfig()
+
+    result = config.map_openai_params(
+        non_default_params={"service_tier": value},
+        optional_params={},
+        model="anthropic.claude-3-sonnet-20240229-v1:0",
+        drop_params=True,
+    )
+
+    assert "serviceTier" not in result
+
+
+def test_map_openai_service_tier_unmapped_value_drops_under_global_drop_params(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", True)
+    config = AmazonConverseConfig()
+
+    result = config.map_openai_params(
+        non_default_params={"service_tier": "ultrafast"},
+        optional_params={},
+        model="anthropic.claude-3-sonnet-20240229-v1:0",
+        drop_params=False,
+    )
+
+    assert "serviceTier" not in result
+
+
+@pytest.mark.parametrize("model", ["bedrock/converse/us.openai.gpt-6-luna", "bedrock/converse/us.amazon.nova-2-lite-v1:0"])
+def test_completion_refuses_unmapped_service_tier_before_calling_bedrock(model, monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    client = MagicMock(spec=HTTPHandler)
+
+    with pytest.raises(litellm.BadRequestError) as error:
+        litellm.completion(
+            model=model,
+            messages=[{"role": "user", "content": "Hello!"}],
+            service_tier="ultrafast",
+            aws_region_name="us-east-1",
+            client=client,
+        )
+
+    assert error.value.status_code == 400
+    assert "service_tier='ultrafast'" in error.value.message
+    client.post.assert_not_called()
+
+
 # Tests for service_tier in response
 
 
diff --git a/tests/unit/llms/bedrock/files/test_bedrock_files_transformation.py b/tests/unit/llms/bedrock/files/test_bedrock_files_transformation.py
index 4d80181b795..2410a594e56 100644
--- a/tests/unit/llms/bedrock/files/test_bedrock_files_transformation.py
+++ b/tests/unit/llms/bedrock/files/test_bedrock_files_transformation.py
@@ -22,7 +22,7 @@ from botocore.credentials import Credentials
 
 import litellm
 from litellm.constants import DEFAULT_REASONING_EFFORT_LOW_THINKING_BUDGET
-from litellm.llms.bedrock.files.transformation import BedrockJsonlFilesTransformation
+from litellm.llms.bedrock.files.transformation import BedrockFilesConfig, BedrockJsonlFilesTransformation
 from tests.unit.proxy.conftest import httpx_transport
 
 
@@ -101,6 +101,49 @@ class TestBedrockFilesTransformation:
         assert "_litellm_undeclared_sentinel" not in model_input, model_input
         assert result[0]["modelInput"]["max_tokens"] == 10
 
+    @staticmethod
+    def _nova_row(
+        url: str = "/v1/chat/completions", model: str = "us.amazon.nova-pro-v1:0", **body_params: object
+    ) -> dict[str, object]:
+        prompt: Final = {"input": "hi"} if url == "/v1/responses" else {"messages": [{"role": "user", "content": "hi"}]}
+        return {
+            "custom_id": "nova-tier-1",
+            "method": "POST",
+            "url": url,
+            "body": {"model": model, **prompt, **body_params},
+        }
+
+    def test_nova_row_with_null_service_tier_sends_no_tier(self):
+        result: Final = BedrockFilesConfig().transform_openai_jsonl_content_to_bedrock_jsonl_content(
+            [self._nova_row(service_tier=None)]
+        )
+
+        assert "serviceTier" not in result[0]["modelInput"]
+
+    @pytest.mark.parametrize("url", ["/v1/chat/completions", "/v1/responses"])
+    def test_nova_row_with_unmapped_service_tier_fails_the_row_like_real_time(self, url: str):
+        with pytest.raises(litellm.UnsupportedParamsError, match="ultrafast"):
+            BedrockFilesConfig().transform_openai_jsonl_content_to_bedrock_jsonl_content(
+                [self._nova_row(url, service_tier="ultrafast")]
+            )
+
+    @pytest.mark.parametrize("url", ["/v1/chat/completions", "/v1/responses"])
+    def test_nova_row_level_drop_params_drops_the_unmapped_service_tier(self, url: str):
+        result: Final = BedrockFilesConfig().transform_openai_jsonl_content_to_bedrock_jsonl_content(
+            [self._nova_row(url, service_tier="ultrafast", drop_params=True)]
+        )
+
+        assert "serviceTier" not in result[0]["modelInput"]
+        assert "drop_params" not in json.dumps(result[0]["modelInput"])
+
+    @pytest.mark.parametrize("url", ["/v1/chat/completions", "/v1/responses"])
+    def test_passthrough_row_keeps_row_level_drop_params_out_of_the_model_input(self, url: str):
+        result: Final = BedrockFilesConfig().transform_openai_jsonl_content_to_bedrock_jsonl_content(
+            [self._nova_row(url, "openai.gpt-oss-120b-1:0", drop_params=True)]
+        )
+
+        assert "drop_params" not in result[0]["modelInput"]
+
     def test_nova_text_only_uses_converse_format(self):
         """
         Test that Nova models produce Converse API format in batch modelInput.
diff --git a/tests/unit/llms/bedrock/messages/invoke_transformations/test_anthropic_claude3_transformation.py b/tests/unit/llms/bedrock/messages/invoke_transformations/test_anthropic_claude3_transformation.py
index 1954659d0b7..56272436857 100644
--- a/tests/unit/llms/bedrock/messages/invoke_transformations/test_anthropic_claude3_transformation.py
+++ b/tests/unit/llms/bedrock/messages/invoke_transformations/test_anthropic_claude3_transformation.py
@@ -2311,6 +2311,32 @@ def test_bedrock_invoke_transform_hoists_only_leading_system_run(local_model_cos
     ]
 
 
+def test_bedrock_invoke_transform_forwards_per_turn_control_beta_with_message_output_config(
+    local_model_cost_map: None, local_beta_headers_config: None
+) -> None:
+    """A live InvokeModel call on 2026-11-05 answered 200 with per-turn-control-2026-07-01 next to a message
+    ``output_config`` on Opus 5.5, so the client's beta and that message must both reach Bedrock."""
+    from litellm.types.router import GenericLiteLLMParams
+
+    messages: Final = [
+        {"role": "user", "content": "hi"},
+        {"role": "assistant", "content": "hello"},
+        {"role": "system", "content": [], "output_config": {"effort": "low"}},
+        {"role": "user", "content": "continue"},
+    ]
+
+    result: Final = AmazonAnthropicClaudeMessagesConfig().transform_anthropic_messages_request(
+        model="us.anthropic.claude-opus-5-5",
+        messages=copy.deepcopy(messages),
+        anthropic_messages_optional_request_params={"max_tokens": 256, "stream": False},
+        litellm_params=GenericLiteLLMParams(),
+        headers={"anthropic-beta": "per-turn-control-2026-07-01"},
+    )
+
+    assert result["messages"] == messages
+    assert result["anthropic_beta"].count("per-turn-control-2026-07-01") == 1
+
+
 def test_bedrock_invoke_transform_converts_mid_conversation_system_for_older_claude(local_model_cost_map):
     """Invoke rejects ``role: "system"`` in every position on Opus 4.7, Sonnet
     4.6, Haiku 4.5, etc. ("role 'system' is not supported on this model"), but
@@ -3964,6 +3990,121 @@ def test_bedrock_removed_tool_change_does_not_add_beta(explicit_beta: bool) -> N
     assert result.get("anthropic_beta", []).count(beta) == int(explicit_beta)
 
 
+_ANTHROPIC_MESSAGE: Final = {
+    "id": "msg_scripted",
+    "type": "message",
+    "role": "assistant",
+    "model": "claude-scripted",
+    "content": [{"type": "text", "text": '{"summary": "sunny", "kind": 1}'}],
+    "stop_reason": "end_turn",
+    "stop_sequence": None,
+    "usage": {"input_tokens": 1, "output_tokens": 1},
+}
+
+
+@dataclass(slots=True)
+class ScriptedBedrockInvoke:
+    replies: tuple[tuple[int, Mapping[str, object] | bytes], ...]
+    bodies: tuple[dict[str, object], ...] = ()
+
+    def __call__(self, request: httpx.Request) -> httpx.Response:
+        self.bodies = (*self.bodies, REASONING_BODY_ADAPTER.validate_json(request.content))
+        status_code, body = self.replies[len(self.bodies) - 1]
+        if isinstance(body, bytes):
+            return httpx.Response(status_code, content=body)
+        return httpx.Response(status_code, json=body)
+
+
+@pytest.mark.usefixtures("local_model_cost_map", "local_beta_headers_config")
+@pytest.mark.parametrize(
+    ("model", "headers", "forwarded"),
+    [
+        ("anthropic.claude-3-haiku-20240307-v1:0", {"anthropic-beta": "per-turn-control-2026-07-01"}, False),
+        ("us.anthropic.claude-opus-4-1-20250805-v1:0", {"anthropic-beta": "per-turn-control-2026-07-01"}, False),
+        ("us.anthropic.claude-sonnet-4-5-20250929-v1:0", {"anthropic-beta": "per-turn-control-2026-07-01"}, True),
+        ("jp.anthropic.claude-opus-4-6-v1", {"anthropic-beta": "per-turn-control-2026-07-01"}, True),
+        ("au.anthropic.claude-opus-4-8", {"anthropic-beta": "per-turn-control-2026-07-01"}, True),
+        ("eu.anthropic.claude-opus-5-5", {"anthropic-beta": "per-turn-control-2026-07-01"}, True),
+        ("global.anthropic.claude-sonnet-5-5", {"anthropic-beta": "per-turn-control-2026-07-01"}, True),
+        ("us.anthropic.claude-newfamily-6", {"anthropic-beta": "per-turn-control-2026-07-01"}, True),
+        ("us.anthropic.claude-sonnet-5-5", {}, False),
+    ],
+)
+async def test_bedrock_invoke_messages_forward_per_turn_control_beta_only_where_the_model_map_flags_it(
+    model: str, headers: dict[str, str], forwarded: bool
+) -> None:
+    """On 2026-11-05 Bedrock InvokeModel answered 400 ``invalid beta flag`` to per-turn-control-2026-07-01 on Claude 3
+    Haiku and 200 on every Claude 4.5 and newer model a QA account reached in 13 regions and in the jp., au. and in.
+    profiles."""
+    bedrock: Final = ScriptedBedrockInvoke(replies=((200, _ANTHROPIC_MESSAGE),))
+
+    await litellm.anthropic_messages(
+        model=f"bedrock/invoke/{model}",
+        messages=[{"role": "user", "content": "hi"}],
+        max_tokens=16,
+        extra_headers=headers,
+        aws_access_key_id="test-access-key",
+        aws_secret_access_key="test-secret-key",
+        aws_region_name="us-east-1",
+        client=AsyncHTTPHandler(transport=httpx.MockTransport(bedrock)),
+    )
+
+    (sent,) = bedrock.bodies
+    sent_betas: Final = TypeAdapter(tuple[str, ...]).validate_python(sent.get("anthropic_beta", ()))
+    assert ("per-turn-control-2026-07-01" in sent_betas) is forwarded
+
+
+@pytest.mark.parametrize(
+    ("model", "flag", "expected"),
+    [
+        ("us.anthropic.claude-opus-5-5", False, (False, True)),
+        ("anthropic.claude-3-haiku-20240307-v1:0", True, (True, False)),
+    ],
+    ids=["opt_out", "opt_in"],
+)
+@pytest.mark.usefixtures("local_model_cost_map", "local_beta_headers_config")
+async def test_bedrock_invoke_messages_per_turn_control_flag_stays_on_its_own_deployment(
+    respx_mock: respx.Router,
+    monkeypatch: pytest.MonkeyPatch,
+    model: str,
+    flag: bool,
+    expected: tuple[bool, bool],
+) -> None:
+    monkeypatch.setattr(litellm, "disable_aiohttp_transport", True)
+    bedrock: Final = ScriptedBedrockInvoke(replies=((200, _ANTHROPIC_MESSAGE), (200, _ANTHROPIC_MESSAGE)))
+    respx_mock.post(url__regex=r"https://bedrock-runtime\..*").mock(side_effect=bedrock)
+    router: Final = litellm.Router(
+        model_list=[
+            {
+                "model_name": model_name,
+                "litellm_params": {
+                    "model": f"bedrock/invoke/{model}",
+                    "aws_access_key_id": "test-access-key",
+                    "aws_secret_access_key": "test-secret-key",
+                    "aws_region_name": "us-east-1",
+                },
+                "model_info": model_info,
+            }
+            for model_name, model_info in (("flagged", {"supports_per_turn_control": flag}), ("default", {}))
+        ],
+        num_retries=0,
+    )
+
+    for model_name in ("flagged", "default"):
+        await router.aanthropic_messages(
+            model=model_name,
+            messages=[{"role": "user", "content": "hi"}],
+            max_tokens=16,
+            extra_headers={"anthropic-beta": "per-turn-control-2026-07-01"},
+        )
+
+    forwarded: Final = tuple(
+        "per-turn-control-2026-07-01" in TypeAdapter(tuple[str, ...]).validate_python(sent.get("anthropic_beta", ()))
+        for sent in bedrock.bodies
+    )
+    assert forwarded == expected
+
+
 @pytest.mark.parametrize("trace", ["enabled", "disabled"])
 def test_bedrock_messages_applies_the_deployment_guardrail_config_as_invoke_headers(trace: str) -> None:
     from litellm.llms.bedrock.messages.invoke_transformations.anthropic_claude3_transformation import (
diff --git a/tests/unit/llms/databricks/chat/test_databricks_chat_transformation.py b/tests/unit/llms/databricks/chat/test_databricks_chat_transformation.py
index 650517c92ca..d56bdeefda6 100644
--- a/tests/unit/llms/databricks/chat/test_databricks_chat_transformation.py
+++ b/tests/unit/llms/databricks/chat/test_databricks_chat_transformation.py
@@ -2447,3 +2447,71 @@ def test_databricks_claude_drops_the_openai_tool_search_tool_under_drop_params(m
     assert mapped["tools"] == [
         {"type": "function", "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {}}}}
     ]
+
+
+_HOSTED_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_FUNCTION_TOOL: Final = {
+    "type": "function",
+    "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {}}},
+}
+
+
+def test_databricks_claude_answers_400_for_a_hosted_mcp_tool_without_drop_params(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as raised:
+        DatabricksConfig().map_openai_params(
+            non_default_params={"tools": [_WEATHER_FUNCTION_TOOL, _HOSTED_MCP_TOOL]},
+            optional_params={},
+            model="databricks-claude-opus-5-5",
+            drop_params=False,
+        )
+    assert raised.value.status_code == 400
+    assert "databricks-claude-opus-5-5 on databricks " in str(raised.value)
+    assert "`deepwiki`" in str(raised.value)
+
+
+def test_databricks_claude_drops_a_hosted_mcp_tool_under_drop_params_and_keeps_the_function_tool(monkeypatch, caplog):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with caplog.at_level("WARNING"):
+        mapped: Final = DatabricksConfig().map_openai_params(
+            non_default_params={"tools": [_HOSTED_MCP_TOOL, _WEATHER_FUNCTION_TOOL]},
+            optional_params={},
+            model="databricks-claude-opus-5-5",
+            drop_params=True,
+        )
+    assert [tool["function"]["name"] for tool in mapped["tools"]] == ["get_weather"]
+    assert any(
+        "`deepwiki`" in record.getMessage() and " on databricks (" in record.getMessage() for record in caplog.records
+    )
+
+
+def test_databricks_claude_sends_no_tools_when_drop_params_drops_every_hosted_mcp_tool(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = DatabricksConfig().map_openai_params(
+        non_default_params={"tools": [_HOSTED_MCP_TOOL], "tool_choice": "required"},
+        optional_params={},
+        model="databricks-claude-opus-5-5",
+        drop_params=True,
+    )
+    assert "tools" not in mapped
+    assert "tool_choice" not in mapped
+
+
+def test_databricks_claude_still_sends_max_completion_tokens_as_max_tokens_when_dropping_a_hosted_mcp_tool(
+    monkeypatch,
+):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = DatabricksConfig().map_openai_params(
+        non_default_params={"tools": [_HOSTED_MCP_TOOL, _WEATHER_FUNCTION_TOOL], "max_completion_tokens": 64},
+        optional_params={},
+        model="databricks-claude-opus-5-5",
+        drop_params=True,
+    )
+    assert mapped["max_tokens"] == 64
+    assert "max_completion_tokens" not in mapped
+    assert [tool["function"]["name"] for tool in mapped["tools"]] == ["get_weather"]
diff --git a/tests/unit/llms/deepgram/audio_transcription/test_deepgram_audio_transcription_transformation.py b/tests/unit/llms/deepgram/audio_transcription/test_deepgram_audio_transcription_transformation.py
index aff90549a7b..d298142fe4b 100644
--- a/tests/unit/llms/deepgram/audio_transcription/test_deepgram_audio_transcription_transformation.py
+++ b/tests/unit/llms/deepgram/audio_transcription/test_deepgram_audio_transcription_transformation.py
@@ -1,10 +1,13 @@
 import io
 import os
 import pathlib
+import traceback
+from typing import Final
 from unittest.mock import MagicMock
 
 import httpx
 import pytest
+from pydantic import ValidationError
 
 from litellm.llms.base_llm.audio_transcription.transformation import AudioTranscriptionRequestData
 from litellm.llms.deepgram.audio_transcription.transformation import (
@@ -587,10 +590,33 @@ def test_transform_response_maps_words_to_openai_word_timestamps(words: object,
         [{"word": "hello", "start": 0.0}],
     ],
 )
-def test_transform_response_wraps_malformed_words_with_the_raw_body(words: object):
+def test_transform_response_keeps_the_transcript_out_of_malformed_words_errors(words: object):
     raw_response = httpx.Response(200, json=_deepgram_payload({"transcript": "hello", "words": words}, {}))
 
     with pytest.raises(ValueError, match="Error transforming Deepgram response: ") as exc_info:
         DeepgramAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
 
-    assert str(exc_info.value).endswith(f"\nResponse: {raw_response.text}")
+    assert "hello" not in "".join(traceback.format_exception(exc_info.value))
+
+
+@pytest.mark.parametrize(
+    ("payload", "failing_lookup_error"),
+    [
+        ({"results": None}, TypeError),
+        (_deepgram_payload({"transcript": "hello", "words": 5}, {}), TypeError),
+        ({**_deepgram_payload({"transcript": "hello"}, {}), "metadata": None}, TypeError),
+        (_deepgram_payload({"transcript": ["hello"]}, {}), ValidationError),
+    ],
+)
+def test_transform_response_wraps_the_error_of_the_failing_lookup_without_the_body(
+    payload: object, failing_lookup_error: type[Exception]
+):
+    raw_response: Final = httpx.Response(200, json=payload)
+
+    with pytest.raises(ValueError, match="Error transforming Deepgram response: ") as exc_info:
+        DeepgramAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
+
+    failing_lookup: Final = exc_info.value.__context__
+    assert isinstance(failing_lookup, failing_lookup_error)
+    assert str(exc_info.value) == f"Error transforming Deepgram response: {failing_lookup}"
+    assert "hello" not in "".join(traceback.format_exception(exc_info.value))
diff --git a/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py b/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py
index dd99ad8bf91..d4775173fe0 100644
--- a/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py
+++ b/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py
@@ -907,3 +907,78 @@ def test_get_complete_url_ignores_a_trailing_slash_on_api_base(api_base: str):
         )
         == "https://gateway.example.com/deepseek/chat/completions"
     )
+
+
+_HOSTED_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+
+
+def test_a_hosted_mcp_tool_answers_400_on_deepseek_without_drop_params(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as raised:
+        DeepSeekChatConfig().map_openai_params(
+            {"tools": [_function_tool("shell"), _HOSTED_MCP_TOOL]}, {}, "deepseek-v4-flash", False
+        )
+    assert raised.value.status_code == 400
+    assert "deepseek-v4-flash on deepseek " in str(raised.value)
+    assert "`deepwiki`" in str(raised.value)
+
+
+def test_deepseek_drops_a_hosted_mcp_tool_under_drop_params_and_keeps_the_function_tool(monkeypatch, caplog):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with caplog.at_level("WARNING"):
+        result: Final = DeepSeekChatConfig().map_openai_params(
+            {"tools": [_HOSTED_MCP_TOOL, _function_tool("shell")], "tool_choice": "auto"}, {}, "deepseek-v4-flash", True
+        )
+    assert result["tools"] == [_function_tool("shell")]
+    assert result["tool_choice"] == "auto"
+    assert any(
+        "`deepwiki`" in record.getMessage() and " on deepseek (" in record.getMessage() for record in caplog.records
+    )
+
+
+def test_deepseek_sends_no_tools_when_drop_params_drops_every_hosted_mcp_tool(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    result: Final = DeepSeekChatConfig().map_openai_params(
+        {"tools": [_HOSTED_MCP_TOOL], "tool_choice": "required", "parallel_tool_calls": True},
+        {},
+        "deepseek-v4-flash",
+        True,
+    )
+    assert "tools" not in result
+    assert "tool_choice" not in result
+    assert "parallel_tool_calls" not in result
+
+
+def test_deepseek_clears_a_tool_choice_naming_the_hosted_mcp_tool_drop_params_dropped(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    result: Final = DeepSeekChatConfig().map_openai_params(
+        {
+            "tools": [_HOSTED_MCP_TOOL, _function_tool("shell")],
+            "tool_choice": {"type": "function", "function": {"name": "deepwiki"}},
+        },
+        {},
+        "deepseek-v4-flash",
+        True,
+    )
+    assert result["tools"] == [_function_tool("shell")]
+    assert "tool_choice" not in result
+
+
+def test_deepseek_removes_tool_selection_beside_legacy_functions_when_drop_params_drops_every_tool(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    functions: Final = [{"name": "shell", "parameters": {"type": "object", "properties": {}}}]
+    result: Final = DeepSeekChatConfig().map_openai_params(
+        {"tools": [_HOSTED_MCP_TOOL], "functions": functions, "tool_choice": "required", "parallel_tool_calls": True},
+        {},
+        "deepseek-v4-flash",
+        True,
+    )
+    assert result["functions"] == functions
+    assert "tools" not in result
+    assert "tool_choice" not in result
+    assert "parallel_tool_calls" not in result
diff --git a/tests/unit/llms/elevenlabs/audio_transcription/test_transformation.py b/tests/unit/llms/elevenlabs/audio_transcription/test_transformation.py
index 86252a1a95d..701327263b8 100644
--- a/tests/unit/llms/elevenlabs/audio_transcription/test_transformation.py
+++ b/tests/unit/llms/elevenlabs/audio_transcription/test_transformation.py
@@ -1,9 +1,11 @@
+import traceback
 from collections.abc import Iterator
 from typing import Final
 
 import httpx
 import pytest
 import respx
+from pydantic import ValidationError
 
 import litellm
 from litellm.caching.llm_caching_handler import LLMClientCache
@@ -109,24 +111,35 @@ def test_transform_audio_transcription_response_without_words_key_has_no_word_li
 @pytest.mark.parametrize(
     "payload",
     [
-        ["not", "an", "object"],
-        "plain text",
-        7,
-        {"text": ["not", "text"]},
-        {"text": "t", "words": None},
-        {"text": "t", "words": 7},
-        {"text": "t", "words": "not a list"},
-        {"text": "t", "words": ["not an object"]},
-        {"text": "t", "words": [{"type": "word", "text": "ok"}, None]},
+        ["sensitive", "an", "object"],
+        "sensitive text",
+        {"text": ["sensitive", "text"]},
+        {"text": "sensitive", "words": None},
+        {"text": "sensitive", "words": 7},
+        {"text": "sensitive", "words": "not a list"},
+        {"text": "sensitive", "words": ["not an object"]},
+        {"text": "sensitive", "words": [{"type": "word", "text": "ok"}, None]},
     ],
 )
-def test_transform_audio_transcription_response_wraps_malformed_payloads_with_the_raw_body(payload: object):
+def test_transform_audio_transcription_response_keeps_the_body_out_of_malformed_payload_errors(payload: object):
     raw_response = httpx.Response(200, json=payload)
 
     with pytest.raises(ValueError, match="Error transforming ElevenLabs response: ") as exc_info:
         ElevenLabsAudioTranscriptionConfig().transform_audio_transcription_response(raw_response=raw_response)
 
-    assert str(exc_info.value).endswith(f"\nResponse: {raw_response.text}")
+    assert "sensitive" not in "".join(traceback.format_exception(exc_info.value))
+
+
+def test_transform_audio_transcription_response_names_the_failing_lookup_of_a_malformed_payload():
+    raw_response = httpx.Response(200, json={"text": "sensitive", "words": [None]})
+
+    with pytest.raises(ValueError, match="Error transforming ElevenLabs response: ") as exc_info:
+        ElevenLabsAudioTranscriptionConfig().transform_audio_transcription_response(raw_response=raw_response)
+
+    failing_lookup: Final = exc_info.value.__context__
+    assert isinstance(failing_lookup, ValidationError)
+    assert str(exc_info.value) == f"Error transforming ElevenLabs response: {failing_lookup}"
+    assert "sensitive" not in "".join(traceback.format_exception(exc_info.value))
 
 
 class TestElevenLabsAudioTranscription:
diff --git a/tests/unit/llms/gemini/audio_transcription/test_gemini_audio_transcription_transformation.py b/tests/unit/llms/gemini/audio_transcription/test_gemini_audio_transcription_transformation.py
index 08084c8fac0..a9ef468525f 100644
--- a/tests/unit/llms/gemini/audio_transcription/test_gemini_audio_transcription_transformation.py
+++ b/tests/unit/llms/gemini/audio_transcription/test_gemini_audio_transcription_transformation.py
@@ -1,8 +1,10 @@
 import base64
 import json
+import traceback
 
 import httpx
 import pytest
+import respx
 
 import litellm
 from litellm.llms.gemini.audio_transcription.transformation import (
@@ -241,6 +243,21 @@ class TestTransformResponse:
         with pytest.raises(GeminiError, match="non-JSON"):
             config.transform_audio_transcription_response(raw)
 
+    def test_non_completed_status_error_omits_response_body(self, config):
+        payload = json.loads(json.dumps(COMPLETED_RESPONSE))
+        payload["status"] = "incomplete"
+        payload["steps"][0]["content"][0]["text"] = "sensitive transcript text"
+        with pytest.raises(GeminiError) as excinfo:
+            config.transform_audio_transcription_response(make_response(payload))
+        assert "status=incomplete" in str(excinfo.value)
+        assert "sensitive transcript text" not in str(excinfo.value)
+
+    def test_non_json_error_omits_response_body(self, config):
+        raw = httpx.Response(200, text="sensitive body", request=httpx.Request("POST", "https://example.test"))
+        with pytest.raises(GeminiError) as excinfo:
+            config.transform_audio_transcription_response(raw)
+        assert "sensitive body" not in str(excinfo.value)
+
     def test_word_without_offsets_survives(self, config):
         payload = json.loads(json.dumps(COMPLETED_RESPONSE))
         payload["steps"][0]["content"][0]["annotations"] = [{"type": "word_info", "text": "Hello"}]
@@ -249,6 +266,66 @@ class TestTransformResponse:
         assert response.get("duration") is None
 
 
+
+class TestNonCompletedInteractionThroughRouter:
+    @pytest.fixture
+    def router(self, monkeypatch):
+        monkeypatch.setattr(litellm, "disable_aiohttp_transport", True)
+        return litellm.Router(
+            model_list=[
+                {
+                    "model_name": "transcribe",
+                    "litellm_params": {"model": "gemini/gemini-3.5-transcribe", "api_key": "test-gemini-key"},
+                }
+            ],
+            num_retries=2,
+        )
+
+    def _interaction(self, status):
+        payload = json.loads(json.dumps(COMPLETED_RESPONSE))
+        payload["status"] = status
+        payload["steps"][0]["content"][0]["text"] = "sensitive transcript text"
+        return payload
+
+    @pytest.mark.asyncio
+    @respx.mock
+    async def test_retry_recovers_an_incomplete_interaction(self, router):
+        route = respx.post("https://generativelanguage.googleapis.com/v1beta/interactions").mock(
+            side_effect=[
+                httpx.Response(200, json=self._interaction("incomplete")),
+                httpx.Response(200, json=COMPLETED_RESPONSE),
+            ]
+        )
+        response = await router.atranscription(model="transcribe", file=("call.wav", AUDIO_BYTES, "audio/wav"))
+        assert route.call_count == 2
+        assert response.text == COMPLETED_RESPONSE["steps"][0]["content"][0]["text"]
+
+    @pytest.mark.asyncio
+    @respx.mock
+    @pytest.mark.parametrize("status", ["incomplete", "failed", "cancelled", "in_progress", None])
+    async def test_non_completed_interaction_retries_then_fails_without_transcript(self, router, status):
+        route = respx.post("https://generativelanguage.googleapis.com/v1beta/interactions").mock(
+            return_value=httpx.Response(200, json=self._interaction(status))
+        )
+        with pytest.raises(litellm.APIConnectionError) as excinfo:
+            await router.atranscription(model="transcribe", file=("call.wav", AUDIO_BYTES, "audio/wav"))
+        assert route.call_count == 3
+        assert f"status={status}" in str(excinfo.value)
+        assert "sensitive transcript text" not in str(excinfo.value)
+
+    @pytest.mark.asyncio
+    @respx.mock
+    async def test_response_field_of_unexpected_type_keeps_transcript_out_of_the_error(self, router):
+        payload = self._interaction("incomplete")
+        payload["steps"][0]["content"] = "sensitive transcript text"
+        respx.post("https://generativelanguage.googleapis.com/v1beta/interactions").mock(
+            return_value=httpx.Response(200, json=payload)
+        )
+        with pytest.raises(litellm.APIConnectionError) as excinfo:
+            await router.atranscription(model="transcribe", file=("call.wav", AUDIO_BYTES, "audio/wav"))
+        assert "sensitive transcript text" not in "".join(traceback.format_exception(excinfo.value))
+
+
 class TestSubtitleSynthesisThroughHandler:
     def _transform(self, config, response_format):
         from unittest.mock import Mock
diff --git a/tests/unit/llms/gigachat/chat/test_transformation.py b/tests/unit/llms/gigachat/chat/test_transformation.py
index 9116a4d1979..4d8a916ea87 100644
--- a/tests/unit/llms/gigachat/chat/test_transformation.py
+++ b/tests/unit/llms/gigachat/chat/test_transformation.py
@@ -7,10 +7,12 @@ Run with: pytest tests/unit/llms/gigachat/chat/test_transformation.py -v
 
 import asyncio
 import importlib
+from typing import Final
 
 import pytest
 
 import litellm
+from litellm.llms.gigachat.chat.transformation import GigaChatConfig
 from tests._vcr_conftest_common import install_live_call_probe, record_vcr_outcome
 
 
@@ -575,3 +577,56 @@ _SCALAR_DEFAULTS = {
     "api_key": getattr(litellm, "api_key", None),
     "cohere_key": getattr(litellm, "cohere_key", None),
 }
+
+
+_HOSTED_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_FUNCTION_TOOL: Final = {
+    "type": "function",
+    "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {}}},
+}
+
+
+def test_a_hosted_mcp_tool_answers_400_on_gigachat_without_drop_params(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as raised:
+        GigaChatConfig().map_openai_params(
+            non_default_params={"tools": [_WEATHER_FUNCTION_TOOL, _HOSTED_MCP_TOOL]},
+            optional_params={},
+            model="GigaChat-2-Max",
+            drop_params=False,
+        )
+    assert raised.value.status_code == 400
+    assert "GigaChat-2-Max on gigachat " in str(raised.value)
+    assert "`deepwiki`" in str(raised.value)
+
+
+def test_gigachat_drops_a_hosted_mcp_tool_under_drop_params_and_keeps_the_function_tool(monkeypatch, caplog):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with caplog.at_level("WARNING"):
+        mapped: Final = GigaChatConfig().map_openai_params(
+            non_default_params={"tools": [_HOSTED_MCP_TOOL, _WEATHER_FUNCTION_TOOL]},
+            optional_params={},
+            model="GigaChat-2-Max",
+            drop_params=True,
+        )
+    assert [function["name"] for function in mapped["functions"]] == ["get_weather"]
+    assert any(
+        "`deepwiki`" in record.getMessage() and " on gigachat (" in record.getMessage() for record in caplog.records
+    )
+
+
+def test_gigachat_sends_no_functions_when_drop_params_drops_every_hosted_mcp_tool(monkeypatch):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = GigaChatConfig().map_openai_params(
+        non_default_params={"tools": [_HOSTED_MCP_TOOL], "tool_choice": "auto"},
+        optional_params={},
+        model="GigaChat-2-Max",
+        drop_params=True,
+    )
+    assert "functions" not in mapped
+    assert "function_call" not in mapped
diff --git a/tests/unit/llms/mistral/audio_transcription/test_mistral_audio_transcription_transformation.py b/tests/unit/llms/mistral/audio_transcription/test_mistral_audio_transcription_transformation.py
index b475cf7e3ff..494b1fe34ad 100644
--- a/tests/unit/llms/mistral/audio_transcription/test_mistral_audio_transcription_transformation.py
+++ b/tests/unit/llms/mistral/audio_transcription/test_mistral_audio_transcription_transformation.py
@@ -3,12 +3,15 @@ from unittest.mock import MagicMock
 
 import httpx
 import litellm
+import pytest
+from pydantic import ValidationError
 
 from litellm.llms.base_llm.audio_transcription.transformation import (
     BaseAudioTranscriptionConfig,
 )
 from litellm.llms.mistral.audio_transcription.transformation import (
     MistralAudioTranscriptionConfig,
+    MistralAudioTranscriptionException,
 )
 from litellm.types.utils import TranscriptionResponse
 from litellm.utils import ProviderConfigManager
@@ -191,3 +194,22 @@ def test_mistral_audio_transcription_response_transform_empty():
 
     assert isinstance(response, TranscriptionResponse)
     assert response.text == ""
+
+
+def test_mistral_audio_transcription_response_transform_keeps_non_json_body_out_of_the_error():
+    raw_response = httpx.Response(200, text='{"text": "sensitive')
+
+    with pytest.raises(MistralAudioTranscriptionException, match="non-JSON") as exc_info:
+        MistralAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
+
+    assert "sensitive" not in str(exc_info.value)
+
+
+@pytest.mark.parametrize("text", [["sensitive"], {"value": "sensitive"}])
+def test_mistral_audio_transcription_response_transform_keeps_a_malformed_text_field_out_of_the_error(text: object):
+    raw_response = httpx.Response(200, json={"text": text, "segments": [{"text": "sensitive"}]})
+
+    with pytest.raises(ValidationError) as exc_info:
+        MistralAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
+
+    assert "sensitive" not in str(exc_info.value)
diff --git a/tests/unit/llms/ollama/test_ollama_chat_transformation.py b/tests/unit/llms/ollama/test_ollama_chat_transformation.py
index 1a0bbe171a9..ae75c40d32a 100644
--- a/tests/unit/llms/ollama/test_ollama_chat_transformation.py
+++ b/tests/unit/llms/ollama/test_ollama_chat_transformation.py
@@ -5,6 +5,7 @@ import sys
 from typing import Final, cast
 
 import pytest
+import respx
 from pydantic import BaseModel
 
 sys.path.insert(
@@ -1108,3 +1109,69 @@ def test_get_complete_url_ignores_a_trailing_slash_on_api_base(api_base: str):
         )
         == "http://gateway.example.com/ollama/api/chat"
     )
+
+
+_DEEPWIKI_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_TOOL: Final = {
+    "type": "function",
+    "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {"city": {"type": "string"}}}},
+}
+
+
+def _ollama_chat_route(respx_mock: respx.MockRouter) -> respx.Route:
+    return respx_mock.post("http://ollama.test:11434/api/chat").respond(
+        json={
+            "model": "qwen3:0.6b",
+            "message": {"role": "assistant", "content": "Sunny"},
+            "done": True,
+            "prompt_eval_count": 5,
+            "eval_count": 3,
+        }
+    )
+
+
+def test_ollama_chat_answers_400_for_a_hosted_mcp_tool_it_cannot_run(
+    respx_mock: respx.MockRouter, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    route: Final = _ollama_chat_route(respx_mock)
+
+    with pytest.raises(litellm.UnsupportedParamsError) as raised:
+        litellm.completion(
+            model="ollama_chat/qwen3:0.6b",
+            messages=[{"role": "user", "content": "weather in Paris?"}],
+            tools=[_DEEPWIKI_MCP_TOOL, _WEATHER_TOOL],
+            api_base="http://ollama.test:11434",
+        )
+
+    assert raised.value.status_code == 400
+    assert "qwen3:0.6b on ollama_chat cannot run the hosted MCP tool `deepwiki`" in str(raised.value)
+    assert not route.called
+
+
+@pytest.mark.parametrize(
+    ("tools", "sent_tools"),
+    [([_DEEPWIKI_MCP_TOOL, _WEATHER_TOOL], [_WEATHER_TOOL]), ([_DEEPWIKI_MCP_TOOL], None)],
+    ids=["beside-a-function", "alone"],
+)
+def test_ollama_chat_drop_params_sends_only_the_tools_ollama_can_call(
+    respx_mock: respx.MockRouter, monkeypatch: pytest.MonkeyPatch, tools: list[object], sent_tools: object
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    route: Final = _ollama_chat_route(respx_mock)
+
+    response: Final = litellm.completion(
+        model="ollama_chat/qwen3:0.6b",
+        messages=[{"role": "user", "content": "weather in Paris?"}],
+        tools=tools,
+        api_base="http://ollama.test:11434",
+        drop_params=True,
+    )
+
+    assert json.loads(route.calls.last.request.content).get("tools") == sent_tools
+    assert response.choices[0].message.content == "Sunny"
diff --git a/tests/unit/llms/ollama/test_ollama_completion_transformation.py b/tests/unit/llms/ollama/test_ollama_completion_transformation.py
index 248e745ebff..0cf18ff6e0d 100644
--- a/tests/unit/llms/ollama/test_ollama_completion_transformation.py
+++ b/tests/unit/llms/ollama/test_ollama_completion_transformation.py
@@ -990,3 +990,73 @@ def test_get_complete_url_ignores_a_trailing_slash_on_api_base(api_base: str):
         )
         == "http://gateway.example.com/ollama/api/generate"
     )
+
+
+_DEEPWIKI_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_TOOL: Final = {
+    "type": "function",
+    "function": {
+        "name": "get_weather",
+        "parameters": {"type": "object", "properties": {"city": {"type": "string"}}},
+    },
+}
+
+
+def _ollama_generate_route(respx_mock: respx.MockRouter) -> respx.Route:
+    return respx_mock.post("http://ollama.test:11434/api/generate").respond(
+        json={"model": "llama3.2", "response": "Sunny", "done": True, "prompt_eval_count": 5, "eval_count": 3}
+    )
+
+
+def test_ollama_answers_400_for_a_hosted_mcp_tool_instead_of_pasting_it_into_the_prompt(
+    respx_mock: respx.MockRouter, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    monkeypatch.setattr(litellm, "add_function_to_prompt", False)
+    route: Final = _ollama_generate_route(respx_mock)
+
+    with pytest.raises(litellm.UnsupportedParamsError) as raised:
+        litellm.completion(
+            model="ollama/llama3.2",
+            messages=[{"role": "user", "content": "weather in Paris?"}],
+            tools=[_DEEPWIKI_MCP_TOOL, _WEATHER_TOOL],
+            api_base="http://ollama.test:11434",
+        )
+
+    assert raised.value.status_code == 400
+    assert "cannot run the hosted MCP tool `deepwiki`" in str(raised.value)
+    assert not route.called
+
+
+@pytest.mark.parametrize(
+    ("tools", "prompt_names_weather"),
+    [([_DEEPWIKI_MCP_TOOL, _WEATHER_TOOL], True), ([_DEEPWIKI_MCP_TOOL], False)],
+    ids=["beside-a-function", "alone"],
+)
+def test_ollama_drop_params_keeps_a_hosted_mcp_tool_out_of_the_prompt(
+    respx_mock: respx.MockRouter, monkeypatch: pytest.MonkeyPatch, tools: list[object], prompt_names_weather: bool
+) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    monkeypatch.setattr(litellm, "add_function_to_prompt", False)
+    route: Final = _ollama_generate_route(respx_mock)
+
+    litellm.completion(
+        model="ollama/llama3.2",
+        messages=[{"role": "user", "content": "weather in Paris?"}],
+        tools=tools,
+        api_base="http://ollama.test:11434",
+        drop_params=True,
+    )
+
+    body: Final = json.loads(route.calls.last.request.content)
+    prompt: Final = body["prompt"]
+    assert (body.get("format") == "json") is prompt_names_weather
+    assert "deepwiki" not in prompt
+    assert ("get_weather" in prompt) is prompt_names_weather
+    assert prompt.startswith("### User:\nweather in Paris?")
+    assert prompt_names_weather or prompt == "### User:\nweather in Paris?\n\n"
diff --git a/tests/unit/llms/openai/test_openai.py b/tests/unit/llms/openai/test_openai.py
index 749dc823f20..961b6c88012 100644
--- a/tests/unit/llms/openai/test_openai.py
+++ b/tests/unit/llms/openai/test_openai.py
@@ -1,4 +1,6 @@
 import asyncio
+import contextlib
+import inspect
 import importlib
 import json
 import os
@@ -1937,3 +1939,49 @@ async def test_chat_completion_sends_the_caller_params_extra_body_and_extra_head
     assert json.loads(sent.content) == {**_WIRE_REQUEST, "vendor_flag": True}
     assert sent.headers["x-caller"] == "unit"
     assert sent.headers["authorization"] == "Bearer sk-test"
+
+
+_SDK_READS_OPENAI_ADMIN_KEY: Final = "admin_api_key" in inspect.signature(AsyncOpenAI.__init__).parameters
+
+
+@pytest.mark.skipif(not _SDK_READS_OPENAI_ADMIN_KEY, reason="openai<3 has no OPENAI_ADMIN_KEY fallback to leak")
+@pytest.mark.asyncio
+async def test_acompletion_never_sends_the_openai_admin_key_for_a_deployment_without_a_key(
+    monkeypatch: pytest.MonkeyPatch,
+):
+    monkeypatch.delenv("OPENAI_API_KEY", raising=False)
+    monkeypatch.setenv("OPENAI_ADMIN_KEY", "sk-admin-only")
+    monkeypatch.setattr(litellm, "api_key", None)
+    monkeypatch.setattr(litellm, "openai_key", None)
+    outbound: Final = asyncio.Queue()
+
+    def respond(request: httpx.Request) -> httpx.Response:
+        outbound.put_nowait(request.headers.get("authorization"))
+        return httpx.Response(
+            200,
+            json={
+                "id": "chatcmpl-no-admin-key",
+                "object": "chat.completion",
+                "created": 0,
+                "model": "gpt-5.4-mini",
+                "choices": [{"index": 0, "message": {"role": "assistant", "content": "ok"}, "finish_reason": "stop"}],
+                "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
+            },
+        )
+
+    async with httpx.AsyncClient(transport=httpx.MockTransport(respond)) as http_client:
+        monkeypatch.setattr(litellm, "aclient_session", http_client)
+        with contextlib.suppress(litellm.AuthenticationError, litellm.InternalServerError):
+            await asyncio.wait_for(
+                litellm.acompletion(
+                    model="openai/gpt-5.4-mini",
+                    api_key="",
+                    messages=[{"role": "user", "content": "who signs this request"}],
+                    num_retries=0,
+                    max_retries=0,
+                ),
+                timeout=10,
+            )
+
+    sent: Final = tuple(outbound.get_nowait() for _ in range(outbound.qsize()))
+    assert all(authorization is None for authorization in sent), sent
diff --git a/tests/unit/llms/openai/transcriptions/test_whisper_transformation.py b/tests/unit/llms/openai/transcriptions/test_whisper_transformation.py
index 2dc24b1b313..339d62ef7ea 100644
--- a/tests/unit/llms/openai/transcriptions/test_whisper_transformation.py
+++ b/tests/unit/llms/openai/transcriptions/test_whisper_transformation.py
@@ -5,8 +5,10 @@ and transform_audio_transcription_response.
 
 import io
 import json
+import traceback
 from unittest.mock import MagicMock
 
+import httpx
 import pytest
 
 from litellm.llms.openai.transcriptions.whisper_transformation import (
@@ -104,3 +106,10 @@ class TestWhisperTransformResponse:
                     is_json=False,
                 )
             )
+
+    def test_json_object_without_transcription_fields_keeps_the_body_out_of_the_error(self):
+        config = OpenAIWhisperAudioTranscriptionConfig()
+        raw_response = httpx.Response(200, json={"segments": [{"text": "sensitive"}]})
+        with pytest.raises(ValueError, match="Invalid response format") as exc_info:
+            config.transform_audio_transcription_response(raw_response)
+        assert "sensitive" not in "".join(traceback.format_exception(exc_info.value))
diff --git a/tests/unit/llms/ovhcloud/test_ovhcloud_audio_transcription_transformation.py b/tests/unit/llms/ovhcloud/test_ovhcloud_audio_transcription_transformation.py
index 422658932e6..ed8ec88e209 100644
--- a/tests/unit/llms/ovhcloud/test_ovhcloud_audio_transcription_transformation.py
+++ b/tests/unit/llms/ovhcloud/test_ovhcloud_audio_transcription_transformation.py
@@ -3,6 +3,7 @@ import pytest
 from pydantic import ValidationError
 
 from litellm.llms.ovhcloud.audio_transcription.transformation import OVHCloudAudioTranscriptionConfig
+from litellm.llms.ovhcloud.utils import OVHCloudException
 from litellm.types.utils import TranscriptionResponse
 
 
@@ -98,3 +99,12 @@ def test_transform_audio_transcription_response_rejects_non_object_bodies(payloa
         _transform(payload)
 
     assert "spoken secret" not in str(exc_info.value)
+
+
+def test_transform_audio_transcription_response_keeps_a_non_json_body_out_of_the_error():
+    raw_response = httpx.Response(200, text='{"text": "spoken secret')
+
+    with pytest.raises(OVHCloudException, match="non-JSON") as exc_info:
+        OVHCloudAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
+
+    assert "spoken secret" not in str(exc_info.value)
diff --git a/tests/unit/llms/scaleway/test_scaleway_audio_transcription_transformation.py b/tests/unit/llms/scaleway/test_scaleway_audio_transcription_transformation.py
index f313f8bd873..16e60a15539 100644
--- a/tests/unit/llms/scaleway/test_scaleway_audio_transcription_transformation.py
+++ b/tests/unit/llms/scaleway/test_scaleway_audio_transcription_transformation.py
@@ -204,6 +204,17 @@ def test_scaleway_transform_response_raises_typed_exception_on_non_json():
         )
 
 
+def test_scaleway_transform_response_keeps_non_json_body_out_of_the_error():
+    raw_response = httpx.Response(
+        200, text='{"text": "sensitive', headers={"content-type": "application/json"}
+    )
+
+    with pytest.raises(ScalewayAudioTranscriptionException, match="non-JSON") as exc_info:
+        ScalewayAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
+
+    assert "sensitive" not in str(exc_info.value)
+
+
 def test_scaleway_transform_response_returns_plain_text_for_non_json_content_type():
     """When Scaleway responds with text/srt/vtt (response_format="text" etc.),
     the content-type is not application/json — return the body as plain text
diff --git a/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_audio_transcription_transformation.py b/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_audio_transcription_transformation.py
index 5898d933941..02b7c0ae71a 100644
--- a/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_audio_transcription_transformation.py
+++ b/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_audio_transcription_transformation.py
@@ -5,7 +5,7 @@ from urllib.parse import urlparse
 
 import httpx
 import pytest
-
+from pydantic import ValidationError
 
 import litellm
 from litellm.llms.vertex_ai.audio_transcription.transformation import (
@@ -208,6 +208,18 @@ class TestTransformResponse:
         response = config.transform_audio_transcription_response(raw_response)
         assert response.text == ""
 
+    def test_non_json_error_omits_response_body(self, config):
+        raw_response = httpx.Response(status_code=200, text='{"results": [{"alternatives": [{"transcript": "sensitive')
+        with pytest.raises(VertexAIError, match="non-JSON") as excinfo:
+            config.transform_audio_transcription_response(raw_response)
+        assert "sensitive" not in str(excinfo.value)
+
+    def test_field_of_unexpected_type_omits_response_body(self, config):
+        raw_response = httpx.Response(status_code=200, json={"results": "sensitive transcript"})
+        with pytest.raises(ValidationError) as excinfo:
+            config.transform_audio_transcription_response(raw_response)
+        assert "sensitive" not in str(excinfo.value)
+
     def test_fractional_billed_duration(self, config):
         raw_response = httpx.Response(
             status_code=200,
diff --git a/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_gemini_transcribe_transformation.py b/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_gemini_transcribe_transformation.py
index 82ea034f91b..532e013c3d7 100644
--- a/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_gemini_transcribe_transformation.py
+++ b/tests/unit/llms/vertex_ai/audio_transcription/test_vertex_ai_gemini_transcribe_transformation.py
@@ -4,6 +4,7 @@ import os
 
 import httpx
 import pytest
+from pydantic import ValidationError
 
 import litellm
 from litellm.llms.vertex_ai.audio_transcription.gemini_transcribe_transformation import (
@@ -255,6 +256,20 @@ class TestTransformResponse:
         with pytest.raises(VertexAIError, match="non-JSON"):
             config.transform_audio_transcription_response(raw_response)
 
+    def test_non_json_error_omits_response_body(self, config):
+        raw_response = httpx.Response(status_code=200, text='{"candidates": [{"content": {"parts": [{"text": "sensitive')
+        with pytest.raises(VertexAIError) as excinfo:
+            config.transform_audio_transcription_response(raw_response)
+        assert "sensitive" not in str(excinfo.value)
+
+    def test_field_of_unexpected_type_omits_response_body(self, config):
+        raw_response = httpx.Response(
+            status_code=200, json={"candidates": [{"content": {"parts": "sensitive transcript"}}]}
+        )
+        with pytest.raises(ValidationError) as excinfo:
+            config.transform_audio_transcription_response(raw_response)
+        assert "sensitive" not in str(excinfo.value)
+
 
 class TestValidateEnvironment:
     def test_sets_oauth_headers(self):
diff --git a/tests/unit/llms/vertex_ai/gemini/test_vertex_and_google_ai_studio_gemini.py b/tests/unit/llms/vertex_ai/gemini/test_vertex_and_google_ai_studio_gemini.py
index 3d7296ffa7b..e014b620dec 100644
--- a/tests/unit/llms/vertex_ai/gemini/test_vertex_and_google_ai_studio_gemini.py
+++ b/tests/unit/llms/vertex_ai/gemini/test_vertex_and_google_ai_studio_gemini.py
@@ -9887,3 +9887,87 @@ async def test_gemini_sends_a_boolean_for_a_gateway_default_written_as_text_or_n
     sent: Final = await _sent_thinking_config("gemini-3.8-flash", {"reasoning_effort": "high"})
 
     assert sent["includeThoughts"] is expected
+
+
+_HOSTED_MCP_TOOL: Final = {
+    "type": "mcp",
+    "server_label": "deepwiki",
+    "server_url": "https://mcp.deepwiki.com/mcp",
+    "require_approval": "never",
+}
+_WEATHER_FUNCTION_TOOL: Final = {
+    "type": "function",
+    "function": {"name": "get_weather", "parameters": {"type": "object", "properties": {}}},
+}
+_GEMINI_ROUTES: Final = (
+    pytest.param(VertexGeminiConfig, "vertex_ai", id="vertex_ai"),
+    pytest.param(GoogleAIStudioGeminiConfig, "gemini", id="gemini"),
+)
+
+
+@pytest.mark.parametrize(("config_class", "route"), _GEMINI_ROUTES)
+def test_a_hosted_mcp_tool_answers_400_on_gemini_without_drop_params(monkeypatch, config_class, route):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.utils.UnsupportedParamsError) as raised:
+        config_class().map_openai_params(
+            non_default_params={"tools": [_WEATHER_FUNCTION_TOOL, _HOSTED_MCP_TOOL]},
+            optional_params={},
+            model="gemini-3.8-flash",
+            drop_params=False,
+        )
+    assert raised.value.status_code == 400
+    assert f"gemini-3.8-flash on {route} " in str(raised.value)
+    assert "`deepwiki`" in str(raised.value)
+    assert "litellm_proxy/mcp/" in str(raised.value)
+
+
+@pytest.mark.parametrize(("config_class", "route"), _GEMINI_ROUTES)
+def test_gemini_drops_a_hosted_mcp_tool_under_drop_params_and_keeps_the_function_tool(
+    monkeypatch, caplog, config_class, route
+):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with caplog.at_level("WARNING"):
+        mapped: Final = config_class().map_openai_params(
+            non_default_params={"tools": [_HOSTED_MCP_TOOL, _WEATHER_FUNCTION_TOOL]},
+            optional_params={},
+            model="gemini-3.8-flash",
+            drop_params=True,
+        )
+    assert "deepwiki" not in json.dumps(mapped)
+    assert "get_weather" in json.dumps(mapped["tools"])
+    assert any(
+        "`deepwiki`" in record.getMessage() and f" on {route} (" in record.getMessage() for record in caplog.records
+    )
+
+
+@pytest.mark.parametrize(("config_class", "route"), _GEMINI_ROUTES)
+def test_gemini_sends_no_tools_when_drop_params_drops_every_hosted_mcp_tool(monkeypatch, config_class, route):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = config_class().map_openai_params(
+        non_default_params={"tools": [_HOSTED_MCP_TOOL], "tool_choice": "required"},
+        optional_params={},
+        model="gemini-3.8-flash",
+        drop_params=True,
+    )
+    assert "tools" not in mapped
+    assert "tool_choice" not in mapped
+
+
+@pytest.mark.parametrize(("config_class", "route"), _GEMINI_ROUTES)
+def test_gemini_keeps_tool_choice_none_for_legacy_functions_after_dropping_every_hosted_mcp_tool(
+    monkeypatch, config_class, route
+):
+    monkeypatch.setattr(litellm, "drop_params", False)
+    mapped: Final = config_class().map_openai_params(
+        non_default_params={
+            "tools": [_HOSTED_MCP_TOOL],
+            "functions": [_WEATHER_FUNCTION_TOOL["function"]],
+            "tool_choice": "none",
+        },
+        optional_params={},
+        model="gemini-3.8-flash",
+        drop_params=True,
+    )
+    assert "deepwiki" not in json.dumps(mapped)
+    assert "get_weather" in json.dumps(mapped["tools"])
+    assert mapped["tool_choice"] == {"functionCallingConfig": {"mode": "NONE"}}
diff --git a/tests/unit/llms/vertex_ai/text_to_speech/test_transformation.py b/tests/unit/llms/vertex_ai/text_to_speech/test_transformation.py
index dc6f35fcfe5..b4ccb1cf081 100644
--- a/tests/unit/llms/vertex_ai/text_to_speech/test_transformation.py
+++ b/tests/unit/llms/vertex_ai/text_to_speech/test_transformation.py
@@ -48,6 +48,73 @@ class TestVertexAITextToSpeechConfig:
 
         assert url == custom_url
 
+    @pytest.mark.parametrize(
+        ("vertex_location", "expected_host"),
+        [
+            ("eu", "eu-texttospeech.googleapis.com"),
+            ("europe-west4", "eu-texttospeech.googleapis.com"),
+            ("europe-west1", "eu-texttospeech.googleapis.com"),
+            ("europe-west3", "eu-texttospeech.googleapis.com"),
+            ("europe-west8", "eu-texttospeech.googleapis.com"),
+            ("europe-west9", "eu-texttospeech.googleapis.com"),
+            ("europe-west12", "eu-texttospeech.googleapis.com"),
+            ("europe-west10", "eu-texttospeech.googleapis.com"),
+            ("europe-central2", "eu-texttospeech.googleapis.com"),
+            ("europe-north1", "eu-texttospeech.googleapis.com"),
+            ("europe-north2", "eu-texttospeech.googleapis.com"),
+            ("europe-southwest1", "eu-texttospeech.googleapis.com"),
+            ("us", "us-texttospeech.googleapis.com"),
+            ("us-central1", "us-texttospeech.googleapis.com"),
+            ("us-east1", "us-texttospeech.googleapis.com"),
+            ("us-east4", "us-texttospeech.googleapis.com"),
+            ("us-east5", "us-texttospeech.googleapis.com"),
+            ("us-south1", "us-texttospeech.googleapis.com"),
+            ("us-west1", "us-texttospeech.googleapis.com"),
+            ("us-west2", "us-texttospeech.googleapis.com"),
+            ("us-west3", "us-texttospeech.googleapis.com"),
+            ("us-west4", "us-texttospeech.googleapis.com"),
+            ("us-west5", "us-texttospeech.googleapis.com"),
+        ],
+    )
+    def test_get_complete_url_uses_regional_endpoint_for_vertex_location(
+        self, vertex_location: str, expected_host: str
+    ) -> None:
+        config: Final = VertexAITextToSpeechConfig()
+
+        url: Final = config.get_complete_url(
+            model="vertex_ai/chirp",
+            api_base=None,
+            litellm_params={"vertex_location": vertex_location},
+        )
+
+        assert url == f"https://{expected_host}/v1/text:synthesize"
+
+    @pytest.mark.parametrize(
+        "vertex_location", ["global", "europe-west2", "asia-northeast1", "northamerica-northeast1", None]
+    )
+    def test_get_complete_url_keeps_global_endpoint_without_a_regional_match(self, vertex_location: str | None) -> None:
+        config: Final = VertexAITextToSpeechConfig()
+
+        url: Final = config.get_complete_url(
+            model="vertex_ai/chirp",
+            api_base=None,
+            litellm_params={"vertex_location": vertex_location},
+        )
+
+        assert url == "https://texttospeech.googleapis.com/v1/text:synthesize"
+
+    def test_get_complete_url_api_base_wins_over_vertex_location(self) -> None:
+        config: Final = VertexAITextToSpeechConfig()
+
+        custom_url: Final = "https://custom-tts-endpoint.example.com/v1/synthesize"
+        url: Final = config.get_complete_url(
+            model="vertex_ai/chirp",
+            api_base=custom_url,
+            litellm_params={"vertex_location": "eu"},
+        )
+
+        assert url == custom_url
+
     @patch.object(VertexAITextToSpeechConfig, "_ensure_access_token")
     @patch.object(VertexAITextToSpeechConfig, "_get_token_and_url")
     def test_transform_text_to_speech_request_body(self, mock_get_token, mock_ensure_token):
@@ -616,8 +683,7 @@ def test_litellm_speech_vertex_ai_chirp(mock_get_token, mock_ensure_token, mock_
     mock_post.assert_called_once()
     call_kwargs = mock_post.call_args.kwargs
 
-    # Verify the URL is the Google Cloud TTS API
-    assert call_kwargs["url"] == "https://texttospeech.googleapis.com/v1/text:synthesize"
+    assert call_kwargs["url"] == "https://us-texttospeech.googleapis.com/v1/text:synthesize"
 
     # Verify request body structure
     assert "json" in call_kwargs
@@ -764,6 +830,109 @@ async def test_aspeech_vertex_ai_sends_ssml_input(
     }
 
 
+@pytest.mark.asyncio
+async def test_aspeech_vertex_ai_chirp_keeps_the_global_host_when_only_vertexai_location_is_set(
+    respx_mock: respx.MockRouter, google_token_endpoint: responses.RequestsMock, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setenv("VERTEXAI_LOCATION", "europe-west4")
+    route: Final = respx_mock.post(_SYNTHESIZE_URL).mock(
+        return_value=httpx.Response(200, json={"audioContent": base64.b64encode(b"global-audio").decode()})
+    )
+
+    response: Final = await litellm.aspeech(
+        model="vertex_ai/chirp",
+        input="Bonjour",
+        voice="fr-FR-Chirp3-HD-Aoede",
+        vertex_credentials=_AUTHORIZED_USER,
+    )
+
+    assert route.call_count == 1
+    assert response.content == b"global-audio"
+
+
+@pytest.mark.asyncio
+async def test_aspeech_vertex_ai_chirp_keeps_the_global_host_with_other_location_defaults(
+    respx_mock: respx.MockRouter, google_token_endpoint: responses.RequestsMock, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setenv("VERTEX_LOCATION", "europe-west4")
+    monkeypatch.setattr(litellm, "vertex_location", "us-central1")
+    route: Final = respx_mock.post(_SYNTHESIZE_URL).mock(
+        return_value=httpx.Response(200, json={"audioContent": base64.b64encode(b"global-audio").decode()})
+    )
+
+    response: Final = await litellm.aspeech(
+        model="vertex_ai/chirp",
+        input="Bonjour",
+        voice="fr-FR-Chirp3-HD-Aoede",
+        vertex_credentials=_AUTHORIZED_USER,
+    )
+
+    assert route.call_count == 1
+    assert response.content == b"global-audio"
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("location_param", "location", "expected_host"),
+    [
+        ("vertex_location", "eu", "eu-texttospeech.googleapis.com"),
+        ("vertex_location", "us-central1", "us-texttospeech.googleapis.com"),
+        ("vertex_ai_location", "europe-west4", "eu-texttospeech.googleapis.com"),
+    ],
+)
+async def test_aspeech_vertex_ai_chirp_calls_the_regional_host_for_an_explicit_location(
+    respx_mock: respx.MockRouter,
+    google_token_endpoint: responses.RequestsMock,
+    location_param: str,
+    location: str,
+    expected_host: str,
+) -> None:
+    route: Final = respx_mock.post(f"https://{expected_host}/v1/text:synthesize").mock(
+        return_value=httpx.Response(200, json={"audioContent": base64.b64encode(b"regional-audio").decode()})
+    )
+
+    response: Final = await litellm.aspeech(
+        model="vertex_ai/chirp",
+        input="Bonjour",
+        voice="fr-FR-Chirp3-HD-Aoede",
+        vertex_credentials=_AUTHORIZED_USER,
+        **{location_param: location},
+    )
+
+    assert route.call_count == 1
+    assert response.content == b"regional-audio"
+
+
+@pytest.mark.asyncio
+async def test_aspeech_vertex_ai_lyria_predict_still_uses_vertexai_location(
+    respx_mock: respx.MockRouter, google_token_endpoint: responses.RequestsMock, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setenv("VERTEXAI_LOCATION", "us-east5")
+    route: Final = respx_mock.post(
+        "https://us-east5-aiplatform.googleapis.com/v1/projects/test-project/locations/us-east5"
+        "/publishers/google/models/lyria-002:predict"
+    ).mock(
+        return_value=httpx.Response(
+            200,
+            json={
+                "predictions": [
+                    {"audioContent": base64.b64encode(b"lyria-audio").decode(), "mimeType": "audio/wav"},
+                ]
+            },
+        )
+    )
+
+    response: Final = await litellm.aspeech(
+        model="vertex_ai/lyria-002",
+        input="calm piano",
+        voice="unused",
+        vertex_credentials=_AUTHORIZED_USER,
+    )
+
+    assert route.call_count == 1
+    assert response.content == b"lyria-audio"
+
+
 _WAV_AUDIO_B64: Final = "UklGRiQAAABXQVZFZm10IA=="
 _WAV_AUDIO: Final = b"RIFF$\x00\x00\x00WAVEfmt "
 _UNLABELED_AUDIO_B64: Final = "bHlyaWEtMy1hdWRpbw=="
diff --git a/tests/unit/llms/watsonx/audio_transcription/test_watsonx_audio_transcription_transformation.py b/tests/unit/llms/watsonx/audio_transcription/test_watsonx_audio_transcription_transformation.py
index b6e5007c456..c9f6f566ad6 100644
--- a/tests/unit/llms/watsonx/audio_transcription/test_watsonx_audio_transcription_transformation.py
+++ b/tests/unit/llms/watsonx/audio_transcription/test_watsonx_audio_transcription_transformation.py
@@ -4,6 +4,7 @@ Tests for IBM WatsonX Audio Transcription.
 Validates the WatsonX transcription response transformation.
 """
 
+import traceback
 from unittest.mock import MagicMock
 
 import httpx
@@ -120,17 +121,21 @@ def test_transform_audio_transcription_response_copies_every_field_except_model(
     assert {key: response[key] for key in expected_extras} == expected_extras
 
 
-@pytest.mark.parametrize("payload", [{}, {"model": "whisper"}, {"duration": 2.0}, {"text": None, "usage": None}])
-def test_transform_audio_transcription_response_without_text_or_usage_reports_the_body(
+@pytest.mark.parametrize(
+    "payload",
+    [
+        {"model": "sensitive"},
+        {"duration": 2.0, "segments": [{"text": "sensitive"}]},
+        {"text": None, "usage": None, "note": "sensitive"},
+    ],
+)
+def test_transform_audio_transcription_response_without_text_or_usage_keeps_the_body_out_of_the_error(
     payload: dict[str, object],
 ) -> None:
     with pytest.raises(ValueError, match="Invalid response format") as exc_info:
         _transform_transcription_response(payload)
 
-    assert exc_info.value.args == (
-        "Invalid response format. Received response does not match the expected format. Got: ",
-        payload,
-    )
+    assert "sensitive" not in "".join(traceback.format_exception(exc_info.value))
 
 
 @pytest.mark.parametrize("payload", [["not", "an", "object"], "plain text", 7, True])
@@ -141,3 +146,12 @@ def test_transform_audio_transcription_response_rejects_non_object_bodies_withou
         _transform_transcription_response(payload)
 
     assert "input_value" not in str(exc_info.value)
+
+
+def test_transform_audio_transcription_response_keeps_a_non_json_body_out_of_the_error() -> None:
+    raw_response = httpx.Response(200, text='{"text": "sensitive')
+
+    with pytest.raises(ValueError, match="Error transforming response to json") as exc_info:
+        IBMWatsonXAudioTranscriptionConfig().transform_audio_transcription_response(raw_response)
+
+    assert "sensitive" not in str(exc_info.value)
diff --git a/tests/unit/llms/xai/test_xai_audio_transcription_transformation.py b/tests/unit/llms/xai/test_xai_audio_transcription_transformation.py
index e2e3fc3d4dc..3505116819b 100644
--- a/tests/unit/llms/xai/test_xai_audio_transcription_transformation.py
+++ b/tests/unit/llms/xai/test_xai_audio_transcription_transformation.py
@@ -1,3 +1,5 @@
+import traceback
+
 import httpx
 import pytest
 
@@ -146,6 +148,23 @@ def test_transform_response_raises_on_error_status():
     assert "Incorrect API key provided" in exc.value.message
 
 
+@pytest.mark.parametrize(
+    "content",
+    [
+        b'{"text": ["sensitive"]}',
+        b'{"text": "ok", "words": [{"text": ["sensitive"]}]}',
+        b'{"text": "sensitive',
+    ],
+)
+def test_transform_response_keeps_a_malformed_body_out_of_the_error(content):
+    raw = httpx.Response(200, content=content, request=httpx.Request("POST", "https://api.x.ai/v1/stt"))
+
+    with pytest.raises(XAIAudioTranscriptionError, match="Error parsing xAI response") as exc:
+        CONFIG.transform_audio_transcription_response(raw_response=raw)
+
+    assert "sensitive" not in "".join(traceback.format_exception(exc.value))
+
+
 def test_transcription_routes_to_xai_stt(monkeypatch):
     monkeypatch.delenv("XAI_API_KEY", raising=False)
     monkeypatch.setattr(litellm, "xai_key", None)
diff --git a/tests/unit/proxy/db/db_transaction_queue/test_tool_discovery_queue.py b/tests/unit/proxy/db/db_transaction_queue/test_tool_discovery_queue.py
index 0a015255f2e..814fdcb4eda 100644
--- a/tests/unit/proxy/db/db_transaction_queue/test_tool_discovery_queue.py
+++ b/tests/unit/proxy/db/db_transaction_queue/test_tool_discovery_queue.py
@@ -2,7 +2,6 @@
 Unit tests for ToolDiscoveryQueue.
 """
 
-
 import pytest
 
 from litellm.proxy.db.db_transaction_queue.tool_discovery_queue import (
@@ -63,3 +62,19 @@ def test_aggregate_sums_call_counts_across_workers_flushes():
         {"tool_name": "get_weather", "origin": "user_defined", "call_count": 5},
         {"tool_name": "search", "call_count": 1},
     )
+
+
+def test_requeued_rows_go_ahead_of_and_merge_with_sightings_since_the_flush(queue: ToolDiscoveryQueue) -> None:
+    queue.add_update({"tool_name": "get_weather", "origin": "mcp_server"})
+    queue.add_update({"tool_name": "search", "origin": "user_defined"})
+    failed_write = queue.flush()
+    queue.add_update({"tool_name": "translate", "origin": "user_defined"})
+    queue.add_update({"tool_name": "search", "origin": "user_defined"})
+
+    queue.requeue(failed_write)
+
+    assert queue.flush() == [
+        {"tool_name": "get_weather", "origin": "mcp_server", "call_count": 1},
+        {"tool_name": "search", "origin": "user_defined", "call_count": 2},
+        {"tool_name": "translate", "origin": "user_defined", "call_count": 1},
+    ]
diff --git a/tests/unit/proxy/db/test_exception_handler.py b/tests/unit/proxy/db/test_exception_handler.py
index a4c16c0949b..6bf5f6b94eb 100644
--- a/tests/unit/proxy/db/test_exception_handler.py
+++ b/tests/unit/proxy/db/test_exception_handler.py
@@ -22,7 +22,7 @@ from prisma.errors import (
 
 import litellm
 from litellm.proxy._types import ProxyErrorTypes, ProxyException
-from litellm.proxy.db.exception_handler import PrismaDBExceptionHandler
+from litellm.proxy.db.exception_handler import PrismaDBExceptionHandler, db_write_never_sent
 
 
 # Test is_database_connection_error method
@@ -966,3 +966,137 @@ def test_is_lock_timeout_error_excludes_other_failures(error: Exception) -> None
 )
 def test_is_statement_timeout_error(error: Exception, expected: bool) -> None:
     assert PrismaDBExceptionHandler.is_statement_timeout_error(error) is expected
+
+
+def _connector_error(message: str) -> DataError:
+    return DataError(
+        data={"user_facing_error": {"message": f"Error in connector: Error querying the database: FATAL: {message}"}}
+    )
+
+
+def _batched_postgres_error(sqlstate: str, message: str) -> DataError:
+    return DataError(
+        data={
+            "user_facing_error": {
+                "message": "Error occurred during query execution: ConnectorError(ConnectorError { user_facing_error: "
+                f'None, kind: QueryError(PostgresError {{ code: "{sqlstate}", message: "{message}", severity: "FATAL" }}) }})'
+            }
+        }
+    )
+
+
+def _localized_error(sqlstate: str) -> DataError:
+    return DataError(data={"user_facing_error": {"message": "FATAL: Datenbank", "meta": {"code": sqlstate}}})
+
+
+_NOT_ACCEPTING_CONNECTIONS: Final = (
+    _connector_error("the database system is starting up"),
+    _connector_error("the database system is shutting down"),
+    _connector_error("the database system is not yet accepting connections"),
+    _connector_error("the database system is not accepting connections"),
+    _connector_error("the database system is in recovery mode"),
+    _localized_error("57P03"),
+    _batched_postgres_error("57P03", "the database system is starting up"),
+    EngineRequestError(
+        MagicMock(status=500),
+        '{"is_panic":false,"message":"Error in connector: Error querying the database: FATAL: the database system is '
+        'starting up","backtrace":null}',
+    ),
+    RawQueryError(
+        data={
+            "user_facing_error": {
+                "message": "Raw query failed. Code: `57P03`. Message: `db error: FATAL: the database system is starting up`",
+                "meta": {"code": "57P03", "message": "FATAL: the database system is starting up"},
+                "error_code": "P2010",
+            }
+        }
+    ),
+)
+_SERVER_TERMINATED: Final = (
+    _connector_error("terminating connection due to administrator command"),
+    _connector_error("terminating connection due to immediate shutdown command"),
+    _connector_error("terminating connection because of unexpected SIGQUIT signal"),
+    _connector_error("terminating connection because of crash of another server process"),
+    _connector_error("terminating connection due to idle-session timeout"),
+    _localized_error("57P01"),
+    _localized_error("57P02"),
+    _localized_error("57P05"),
+    _batched_postgres_error("57P01", "terminating connection due to administrator command"),
+)
+
+
+@pytest.mark.parametrize(
+    ("error", "connection_error"),
+    [
+        *((error, True) for error in _NOT_ACCEPTING_CONNECTIONS),
+        *((error, False) for error in _SERVER_TERMINATED),
+    ],
+)
+def test_postgres_lifecycle_errors_mean_the_database_is_unavailable(error: Exception, connection_error: bool) -> None:
+    """A server that is restarting, shutting down or cutting sessions is a transient outage:
+    auth answers 503 rather than 401, and the spend-log writer must not take the rows for poison.
+    Only a server refusing connections opens the ``allow_requests_on_db_unavailable`` fallback,
+    one terminated session does not prove the database is down."""
+    assert {
+        "lifecycle": PrismaDBExceptionHandler.is_database_lifecycle_error(error),
+        "service_unavailable": PrismaDBExceptionHandler.is_database_service_unavailable_error(error),
+        "connection_error": PrismaDBExceptionHandler.is_database_connection_error(error),
+        "permanent": PrismaDBExceptionHandler.is_permanent_database_fault(error),
+    } == {
+        "lifecycle": True,
+        "service_unavailable": True,
+        "connection_error": connection_error,
+        "permanent": False,
+    }
+
+
+@pytest.mark.parametrize(
+    ("error", "never_sent"),
+    [
+        *((error, True) for error in _NOT_ACCEPTING_CONNECTIONS),
+        *((error, False) for error in _SERVER_TERMINATED),
+        (DataError(data={"user_facing_error": {"message": "Can't reach database server at `db`:`5432`"}}), True),
+        (DataError(data={"user_facing_error": {"error_code": "P1001", "message": "unreachable"}}), True),
+        (_capacity_error("sorry, too many clients already"), True),
+        (_localized_error("53300"), True),
+        (
+            DataError(
+                data={
+                    "user_facing_error": {
+                        "error_code": "P2024",
+                        "message": "Timed out fetching a new connection from the connection pool",
+                    }
+                }
+            ),
+            True,
+        ),
+        (httpx.ReadTimeout("read timed out"), False),
+        (_localized_error("57014"), False),
+    ],
+)
+def test_db_write_never_sent_only_for_failures_before_any_statement_ran(error: Exception, never_sent: bool) -> None:
+    """A refused, unreachable or full server provably applied nothing, while a terminated session
+    or a timeout may have committed before the failure, so only the former lets a non-idempotent
+    write be replayed."""
+    assert db_write_never_sent(error) is never_sent
+
+
+@pytest.mark.parametrize(
+    "error",
+    [
+        _localized_error("57P04"),
+        _localized_error("57014"),
+        _localized_error("23505"),
+        DataError(data={"user_facing_error": {"message": "invalid byte sequence for encoding UTF8: 0x00"}}),
+        RuntimeError("the database system is starting up"),
+    ],
+)
+def test_other_failures_are_not_postgres_lifecycle_errors(error: Exception) -> None:
+    assert PrismaDBExceptionHandler.is_database_lifecycle_error(error) is False
+    assert db_write_never_sent(error) is False
+
+
+def test_lifecycle_error_is_seen_through_a_wrapping_exception() -> None:
+    wrapped: Final = RuntimeError("spend flush failed")
+    wrapped.__cause__ = _connector_error("the database system is starting up")
+    assert PrismaDBExceptionHandler.is_database_service_unavailable_error_in_chain(wrapped) is True
diff --git a/tests/unit/proxy/db/test_tool_registry_writer.py b/tests/unit/proxy/db/test_tool_registry_writer.py
index 76898b0eeab..a5ad897913e 100644
--- a/tests/unit/proxy/db/test_tool_registry_writer.py
+++ b/tests/unit/proxy/db/test_tool_registry_writer.py
@@ -69,9 +69,7 @@ def _make_prisma(
     prisma.db.litellm_tooltable = MagicMock()
     prisma.db.litellm_tooltable.upsert = AsyncMock(return_value=upsert_return)
     prisma.db.execute_raw = AsyncMock(return_value=1)
-    prisma.db.litellm_tooltable.find_many = AsyncMock(
-        return_value=find_many_rows if find_many_rows is not None else []
-    )
+    prisma.db.litellm_tooltable.find_many = AsyncMock(return_value=find_many_rows if find_many_rows is not None else [])
     prisma.db.litellm_tooltable.find_unique = AsyncMock(return_value=find_unique_row)
     prisma.db.litellm_verificationtoken = MagicMock()
     prisma.db.litellm_verificationtoken.find_many = AsyncMock(return_value=list(key_rows))
@@ -227,9 +225,7 @@ async def test_get_tool_found():
     result = await get_tool(prisma, "my_tool")
     assert result is not None
     assert result.tool_name == "my_tool"
-    prisma.db.litellm_tooltable.find_unique.assert_awaited_once_with(
-        where={"tool_name": "my_tool"}
-    )
+    prisma.db.litellm_tooltable.find_unique.assert_awaited_once_with(where={"tool_name": "my_tool"})
 
 
 @pytest.mark.asyncio
@@ -266,9 +262,7 @@ async def test_update_tool_policy_calls_upsert_then_get_tool():
         updated_by="admin",
     )
     prisma = _make_prisma(find_unique_row=row)
-    result = await update_tool_policy(
-        prisma, "my_tool", updated_by="admin", input_policy="blocked"
-    )
+    result = await update_tool_policy(prisma, "my_tool", updated_by="admin", input_policy="blocked")
     assert result is not None
     assert result.input_policy == "blocked"
     prisma.db.litellm_tooltable.upsert.assert_awaited_once()
@@ -567,3 +561,42 @@ async def test_failed_tool_table_write_requeues_the_rows_only_when_they_provably
     left_in_redis = [json.loads(entry) for entry in redis.lists.get(REDIS_TOOL_DISCOVERY_BUFFER_KEY, [])]
     expected = [[{"tool_name": "get_weather", "origin": "user_defined", "call_count": 1}]] if requeued else []
     assert left_in_redis == expected, f"requeued={requeued} but redis holds {left_in_redis}"
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("failure", "requeued"),
+    [
+        (_postgres_rejection("57P03"), True),
+        (_postgres_rejection("53300"), True),
+        (_postgres_rejection("57P01"), False),
+        (_postgres_rejection("54000"), False),
+        (_postgres_rejection("23502"), False),
+    ],
+    ids=[
+        "restarting_server_keeps_the_rows",
+        "full_server_keeps_the_rows",
+        "terminated_session_may_have_counted_so_the_rows_are_dropped",
+        "oversized_value_is_dropped",
+        "rejected_row_is_dropped",
+    ],
+)
+async def test_failed_write_without_redis_keeps_the_rows_in_the_queue_only_when_they_provably_did_not_apply(
+    failure: Exception, requeued: bool
+):
+    queue = ToolDiscoveryQueue()
+    queue.add_update({"tool_name": "get_weather", "origin": "user_defined"})
+    prisma_client = MagicMock()
+    prisma_client.db.execute_raw = AsyncMock(side_effect=failure)
+
+    await commit_tool_discoveries(
+        prisma_client=prisma_client,
+        tool_discovery_queue=queue,
+        redis_update_buffer=RedisUpdateBuffer(redis_cache=_InMemoryRedis()),
+        pod_lock_manager=PodLockManager(redis_cache=_InMemoryRedis()),
+        use_redis_buffer=False,
+    )
+    queue.add_update({"tool_name": "get_weather", "origin": "user_defined"})
+
+    expected = [{"tool_name": "get_weather", "origin": "user_defined", "call_count": 2 if requeued else 1}]
+    assert queue.flush() == expected
diff --git a/tests/unit/proxy/guardrails/guardrail_hooks/test_mcp_security.py b/tests/unit/proxy/guardrails/guardrail_hooks/test_mcp_security.py
index e4c7bcba951..eeaa105565e 100644
--- a/tests/unit/proxy/guardrails/guardrail_hooks/test_mcp_security.py
+++ b/tests/unit/proxy/guardrails/guardrail_hooks/test_mcp_security.py
@@ -6,19 +6,24 @@ and allows requests with only registered servers. Covers both /chat/completions
 and /responses API paths (same pre_call_hook logic, different call_type).
 """
 
-from typing import Literal
-from unittest.mock import MagicMock, patch
+from typing import Final, Literal
+from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 from fastapi import HTTPException
 
 import litellm
+from litellm.caching.caching import DualCache
 from litellm.proxy._types import UserAPIKeyAuth
 from litellm.proxy.guardrails.guardrail_hooks.mcp_security import initialize_guardrail
 from litellm.proxy.guardrails.guardrail_hooks.mcp_security.mcp_security_guardrail import (
     MCPSecurityGuardrail,
 )
+from litellm.proxy._experimental.mcp_server.mcp_server_manager import MCPServerManager
 from litellm.types.guardrails import Guardrail, GuardrailEventHooks, LitellmParams
+from litellm.types.mcp import MCPTransport
+from litellm.types.mcp_server.mcp_server_manager import MCPServer
+from litellm.types.mcp_server.mcp_toolset import MCPToolset
 
 
 @pytest.fixture
@@ -60,93 +65,73 @@ class TestExtractMCPServerNames:
         assert names == set()
 
 
+def _manager_with_saved_server() -> MCPServerManager:
+    manager: Final = MCPServerManager()
+    server: Final = MCPServer(
+        server_id="3f6b2c1e-saved-zapier",
+        name="zapier",
+        server_name="zapier",
+        alias="zap",
+        transport=MCPTransport.http,
+        url="https://upstream.example/mcp",
+    )
+    manager.registry[server.server_id] = server
+    return manager
+
+
 class TestMCPSecurityGuardrailPreCall:
     @pytest.mark.asyncio
-    @patch(
-        "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager"
-    )
-    async def test_blocks_unregistered_server_chat_completions(
-        self, mock_manager, guardrail
-    ):
-        """Simulates /chat/completions with an unregistered MCP server."""
-        mock_manager.get_registry.return_value = {"zapier": MagicMock()}
-
+    @pytest.mark.parametrize("call_type", ["acompletion", "aresponses"])
+    async def test_blocks_unregistered_server(self, guardrail, call_type):
         data = {
             "tools": [
                 {"type": "mcp", "server_url": "litellm_proxy/mcp/zapier"},
                 {"type": "mcp", "server_url": "litellm_proxy/mcp/evil_server"},
             ],
             "model": "gpt-4",
-            "messages": [{"role": "user", "content": "hi"}],
             "guardrails": ["test-mcp-security"],
         }
 
-        with pytest.raises(HTTPException) as exc_info:
+        with (
+            patch("litellm.proxy.proxy_server.prisma_client", None),
+            patch(
+                "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager",
+                _manager_with_saved_server(),
+            ),
+            pytest.raises(HTTPException) as exc_info,
+        ):
             await guardrail.async_pre_call_hook(
                 user_api_key_dict=UserAPIKeyAuth(),
                 cache=MagicMock(),
                 data=data,
-                call_type="acompletion",
+                call_type=call_type,
             )
         assert exc_info.value.status_code == 400
-        assert "evil_server" in str(exc_info.value.detail)
+        assert exc_info.value.detail["unregistered_servers"] == ["evil_server"]
 
     @pytest.mark.asyncio
-    @patch(
-        "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager"
-    )
-    async def test_blocks_unregistered_server_responses_api(
-        self, mock_manager, guardrail
-    ):
-        """Simulates /responses with an unregistered MCP server."""
-        mock_manager.get_registry.return_value = {"github": MagicMock()}
-
+    @pytest.mark.parametrize("call_type", ["acompletion", "aresponses"])
+    @pytest.mark.parametrize("reference", ["zapier", "zap", "3f6b2c1e-saved-zapier"])
+    async def test_allows_saved_server_by_any_name_the_gateway_routes(self, guardrail, call_type, reference):
         data = {
-            "tools": [
-                {"type": "mcp", "server_url": "litellm_proxy/mcp/unknown_server"},
-            ],
-            "model": "gpt-4o",
-            "input": "What can you do?",
-            "guardrails": ["test-mcp-security"],
-        }
-
-        with pytest.raises(HTTPException) as exc_info:
-            await guardrail.async_pre_call_hook(
-                user_api_key_dict=UserAPIKeyAuth(),
-                cache=MagicMock(),
-                data=data,
-                call_type="aresponses",
-            )
-        assert exc_info.value.status_code == 400
-        assert "unknown_server" in str(exc_info.value.detail)
-
-    @pytest.mark.asyncio
-    @patch(
-        "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager"
-    )
-    async def test_allows_registered_servers(self, mock_manager, guardrail):
-        """All MCP servers are registered - request passes through."""
-        mock_manager.get_registry.return_value = {
-            "zapier": MagicMock(),
-            "github": MagicMock(),
-        }
-
-        data = {
-            "tools": [
-                {"type": "mcp", "server_url": "litellm_proxy/mcp/zapier"},
-                {"type": "mcp", "server_url": "litellm_proxy/mcp/github"},
-            ],
+            "tools": [{"type": "mcp", "server_url": f"litellm_proxy/mcp/{reference}"}],
             "model": "gpt-4",
-            "messages": [{"role": "user", "content": "hi"}],
             "guardrails": ["test-mcp-security"],
         }
 
-        result = await guardrail.async_pre_call_hook(
-            user_api_key_dict=UserAPIKeyAuth(),
-            cache=MagicMock(),
-            data=data,
-            call_type="acompletion",
-        )
+        with (
+            patch("litellm.proxy.proxy_server.prisma_client", None),
+            patch(
+                "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager",
+                _manager_with_saved_server(),
+            ),
+        ):
+            result = await guardrail.async_pre_call_hook(
+                user_api_key_dict=UserAPIKeyAuth(),
+                cache=MagicMock(),
+                data=data,
+                call_type=call_type,
+            )
         assert result == data
 
     @pytest.mark.asyncio
@@ -221,11 +206,13 @@ async def test_guardrail_observes_saved_server_creation_and_deletion_on_another_
     prisma.writer_db = prisma.db
     prisma.db.litellm_mcpservertable.find_many = AsyncMock(side_effect=([row], []))
     prisma.db.litellm_config.find_unique = AsyncMock(return_value=None)
+    prisma.db.litellm_mcptoolsettable.find_first = AsyncMock(return_value=None)
     data = {"tools": [{"type": "mcp", "server_url": "litellm_proxy/mcp/peer-server"}],
         "guardrails": ["test-mcp-security"]}
     with (
         patch("litellm.proxy.proxy_server.prisma_client", prisma),
         patch("litellm.proxy.proxy_server.general_settings", {}),
+        patch("litellm.proxy.proxy_server.user_api_key_cache", DualCache()),
         patch("litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager", manager),
     ):
         result = await guardrail.async_pre_call_hook(UserAPIKeyAuth(), MagicMock(), data, call_type)
@@ -234,3 +221,64 @@ async def test_guardrail_observes_saved_server_creation_and_deletion_on_another_
             await guardrail.async_pre_call_hook(UserAPIKeyAuth(), MagicMock(), data, call_type)
     assert exc.value.status_code == 400
     assert exc.value.detail["unregistered_servers"] == ["peer-server"]
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("call_type", ["acompletion", "aresponses"])
+async def test_allows_saved_toolset_by_name_and_blocks_unknown_name(guardrail, call_type):
+    saved_toolset: Final = MCPToolset(toolset_id="7c1d-research", toolset_name="research")
+
+    async def find_toolset(*, where: dict[str, str]) -> MCPToolset | None:
+        return saved_toolset if where["toolset_name"] == saved_toolset.toolset_name else None
+
+    prisma: Final = MagicMock()
+    prisma.writer_db = prisma.db
+    prisma.db.litellm_mcpservertable.find_many = AsyncMock(return_value=[])
+    prisma.db.litellm_config.find_unique = AsyncMock(return_value=None)
+    prisma.db.litellm_mcptoolsettable.find_first = AsyncMock(side_effect=find_toolset)
+    data: Final = {
+        "tools": [
+            {"type": "mcp", "server_url": "litellm_proxy/mcp/research"},
+            {"type": "mcp", "server_url": "litellm_proxy/mcp/evil_server"},
+        ],
+        "guardrails": ["test-mcp-security"],
+    }
+    with (
+        patch("litellm.proxy.proxy_server.prisma_client", prisma),
+        patch("litellm.proxy.proxy_server.general_settings", {}),
+        patch("litellm.proxy.proxy_server.user_api_key_cache", DualCache()),
+        patch(
+            "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager",
+            MCPServerManager(),
+        ),
+        pytest.raises(HTTPException) as exc,
+    ):
+        await guardrail.async_pre_call_hook(UserAPIKeyAuth(), MagicMock(), data, call_type)
+    assert exc.value.detail["unregistered_servers"] == ["evil_server"]
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("call_type", ["acompletion", "aresponses"])
+async def test_blocks_the_name_with_the_policy_result_when_the_toolset_read_fails(guardrail, call_type):
+    prisma: Final = MagicMock()
+    prisma.writer_db = prisma.db
+    prisma.db.litellm_mcpservertable.find_many = AsyncMock(return_value=[])
+    prisma.db.litellm_config.find_unique = AsyncMock(return_value=None)
+    prisma.db.litellm_mcptoolsettable.find_first = AsyncMock(side_effect=RuntimeError("toolset table unavailable"))
+    data: Final = {
+        "tools": [{"type": "mcp", "server_url": "litellm_proxy/mcp/research"}],
+        "guardrails": ["test-mcp-security"],
+    }
+    with (
+        patch("litellm.proxy.proxy_server.prisma_client", prisma),
+        patch("litellm.proxy.proxy_server.general_settings", {}),
+        patch("litellm.proxy.proxy_server.user_api_key_cache", DualCache()),
+        patch(
+            "litellm.proxy._experimental.mcp_server.mcp_server_manager.global_mcp_server_manager",
+            MCPServerManager(),
+        ),
+        pytest.raises(HTTPException) as exc,
+    ):
+        await guardrail.async_pre_call_hook(UserAPIKeyAuth(), MagicMock(), data, call_type)
+    assert exc.value.status_code == 400
+    assert exc.value.detail["unregistered_servers"] == ["research"]
diff --git a/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrails/test_unified_guardrail.py b/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrails/test_unified_guardrail.py
index 3efbe6475b2..1417b87417c 100644
--- a/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrails/test_unified_guardrail.py
+++ b/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrails/test_unified_guardrail.py
@@ -3053,3 +3053,21 @@ async def test_pre_call_hook_skips_attachment_scan_when_guardrail_has_none():
     )
 
     assert len(guardrail.apply_calls) == 1
+
+
+@pytest.mark.asyncio
+async def test_moderation_hook_lets_responses_compact_through_without_a_translation() -> None:
+    handler: Final = UnifiedLLMGuardrails()
+    guardrail: Final = RecordingGuardrail()
+    data: Final = {
+        "guardrail_to_apply": guardrail,
+        "model": "gpt-5.4-mini",
+        "input": [{"role": "user", "content": "Remember the number 42."}],
+    }
+
+    result: Final = await handler.async_moderation_hook(
+        data=data, user_api_key_dict=UserAPIKeyAuth(api_key="test-key"), call_type="acompact_responses"
+    )
+
+    assert result is data
+    assert guardrail.apply_calls == []
diff --git a/tests/unit/proxy/utils/prisma_and_spend/test_spend_functions.py b/tests/unit/proxy/utils/prisma_and_spend/test_spend_functions.py
index fc7ae531c34..293f2d49f43 100644
--- a/tests/unit/proxy/utils/prisma_and_spend/test_spend_functions.py
+++ b/tests/unit/proxy/utils/prisma_and_spend/test_spend_functions.py
@@ -23,9 +23,9 @@ import pytest
 from litellm.constants import REDIS_SPEND_LOGS_BUFFER_KEY
 from litellm.proxy.utils import (
     MAX_SPEND_LOG_DRAIN_ITERATIONS,
+    drain_spend_logs_queue,
     monitor_spend_logs_queue,
     raise_failed_update_spend_exception,
-    drain_spend_logs_queue,
     recover_parked_spend_logs,
     update_daily_tag_spend,
     update_spend,
@@ -985,6 +985,85 @@ async def test_update_spend_logs_job_requeues_whole_batch_when_postgres_is_out_o
     } == {"create_many_calls": 1, "queue_after": ["r1", "r2", "r3"], "backoff_sleeps": []}
 
 
+def _postgres_restarting() -> Exception:
+    """prisma's shape for Postgres SQLSTATE 57P03 while the server runs crash recovery after
+    a restart: a base ``DataError`` carrying only the connector message."""
+    from prisma.errors import DataError
+
+    return DataError(
+        data={
+            "user_facing_error": {
+                "is_panic": False,
+                "message": "Error in connector: Error querying the database: FATAL: the database system is starting up",
+                "backtrace": None,
+            }
+        }
+    )
+
+
+def _postgres_unreachable() -> Exception:
+    from prisma.errors import DataError
+
+    return DataError(
+        data={
+            "user_facing_error": {
+                "is_panic": False,
+                "message": "Can't reach database server at `db.internal`:`5432`",
+                "error_code": "P1001",
+            }
+        }
+    )
+
+
+def _postgres_terminated_session() -> Exception:
+    from prisma.errors import DataError
+
+    return DataError(
+        data={
+            "user_facing_error": {
+                "is_panic": False,
+                "message": "Error in connector: Error querying the database: FATAL: terminating connection due to "
+                "administrator command",
+                "meta": {"code": "57P01", "message": "terminating connection due to administrator command"},
+            }
+        }
+    )
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("error", [_postgres_restarting(), _postgres_terminated_session()], ids=["57P03", "57P01"])
+async def test_update_spend_logs_job_keeps_every_row_while_postgres_restarts(
+    error: Exception,
+    mock_prisma_client: MagicMock,
+    make_spend_log_row: Callable[..., dict[str, object]],
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """A restarting server refuses or cuts every statement, so the batch is not bisected
+    into per-row drops: it is retried whole and then goes back to the queue head."""
+    monkeypatch.setattr(asyncio, "sleep", AsyncMock())
+    proxy_logging: Final = MagicMock()
+    proxy_logging.failure_handler = AsyncMock()
+    mock_prisma_client.spend_log_transactions = [
+        make_spend_log_row(request_id="r1"),
+        make_spend_log_row(request_id="r2"),
+        make_spend_log_row(request_id="r3"),
+        make_spend_log_row(request_id="r4"),
+    ]
+    mock_prisma_client.db.litellm_spendlogs.create_many = AsyncMock(side_effect=error)
+
+    with suppress(Exception):
+        await update_spend_logs_job(
+            prisma_client=mock_prisma_client,
+            db_writer_client=None,
+            proxy_logging_obj=proxy_logging,
+        )
+
+    assert {
+        "create_many_calls": mock_prisma_client.db.litellm_spendlogs.create_many.await_count,
+        "queue_after": [row["request_id"] for row in mock_prisma_client.spend_log_transactions],
+    } == {"create_many_calls": 4, "queue_after": ["r1", "r2", "r3", "r4"]}
+
+
 def _tool_usage_transaction(request_id: str) -> object:
     from litellm.proxy.db.spend_log_tool_index import ToolUsageTransaction
 
@@ -1177,6 +1256,53 @@ async def test_model_usage_flush_requeues_and_stops_the_job_when_postgres_is_out
     } == {"queue_after": [first, second], "autorouter_queue_after": 1}
 
 
+@pytest.mark.asyncio
+@pytest.mark.parametrize("error", [_postgres_restarting(), _postgres_unreachable()], ids=["57P03", "P1001"])
+async def test_rollups_requeue_and_stop_the_job_while_postgres_cannot_take_writes(
+    error: Exception,
+    mock_prisma_client: MagicMock,
+) -> None:
+    """A server that is restarting or unreachable never saw the rollup batch, so the tool
+    usage increments are kept for the next flush, and the job stops before draining the
+    auto-router queue into the same outage."""
+    mock_prisma_client.db.litellm_spendlogtoolindex.create_many = AsyncMock(side_effect=error)
+    mock_prisma_client.spend_log_transactions = []
+    first, second = _tool_usage_transaction("r1"), _tool_usage_transaction("r2")
+    mock_prisma_client.tool_usage_transactions = [first, second]
+    mock_prisma_client.autorouter_turn_transactions = [MagicMock(name="autorouter_turn")]
+
+    with suppress(Exception):
+        await update_spend_logs_job(
+            prisma_client=mock_prisma_client,
+            db_writer_client=None,
+            proxy_logging_obj=MagicMock(),
+        )
+
+    assert {
+        "queue_after": mock_prisma_client.tool_usage_transactions,
+        "autorouter_queue_after": len(mock_prisma_client.autorouter_turn_transactions),
+    } == {"queue_after": [first, second], "autorouter_queue_after": 1}
+
+
+@pytest.mark.asyncio
+async def test_rollups_drop_a_batch_whose_session_the_server_terminated(
+    mock_prisma_client: MagicMock,
+) -> None:
+    """A terminated session (57P01) may have committed before it was cut, and the rollup
+    increments are not idempotent, so the batch is dropped rather than counted twice."""
+    mock_prisma_client.db.litellm_spendlogtoolindex.create_many = AsyncMock(side_effect=_postgres_terminated_session())
+    mock_prisma_client.spend_log_transactions = []
+    mock_prisma_client.tool_usage_transactions = [_tool_usage_transaction("r1")]
+
+    await update_spend_logs_job(
+        prisma_client=mock_prisma_client,
+        db_writer_client=None,
+        proxy_logging_obj=MagicMock(),
+    )
+
+    assert mock_prisma_client.tool_usage_transactions == []
+
+
 @pytest.mark.asyncio
 async def test_model_usage_flush_still_drops_a_batch_that_may_have_applied(
     mock_prisma_client: MagicMock,
diff --git a/tests/unit/responses/litellm_completion_transformation/test_litellm_completion_responses.py b/tests/unit/responses/litellm_completion_transformation/test_litellm_completion_responses.py
index 79d5ec5d877..4fb2a4af571 100644
--- a/tests/unit/responses/litellm_completion_transformation/test_litellm_completion_responses.py
+++ b/tests/unit/responses/litellm_completion_transformation/test_litellm_completion_responses.py
@@ -6536,3 +6536,26 @@ async def test_bridge_partial_response_on_disconnect_bills_the_relayed_chat_chun
     assert incomplete_event.response.usage is not None
     assert incomplete_event.response.usage.output_tokens == litellm.token_counter(model="gpt-4o-mini", text=relayed_text)
     assert incomplete_event.response.usage.input_tokens > 0
+
+
+def test_a_hosted_mcp_tool_sent_to_responses_on_bedrock_converse_answers_400(monkeypatch) -> None:
+    monkeypatch.setattr(litellm, "drop_params", False)
+    with pytest.raises(litellm.UnsupportedParamsError) as raised:
+        litellm.responses(
+            model="bedrock/converse/us.openai.gpt-oss-120b-1:0",
+            input="What does the deepwiki MCP server say about litellm?",
+            tools=[
+                {
+                    "type": "mcp",
+                    "server_label": "deepwiki",
+                    "server_url": "https://mcp.deepwiki.com/mcp",
+                    "require_approval": "never",
+                }
+            ],
+            aws_access_key_id="AKIAHOSTEDMCP",
+            aws_secret_access_key="hosted-mcp-secret",
+            aws_region_name="us-east-1",
+        )
+    assert raised.value.status_code == 400
+    assert "`deepwiki`" in str(raised.value)
+    assert "litellm_proxy/mcp/" in str(raised.value)
diff --git a/tests/unit/router_strategy/test_router_tag_regex_routing.py b/tests/unit/router_strategy/test_router_tag_regex_routing.py
index 212c2627d88..46e79a1b8c8 100644
--- a/tests/unit/router_strategy/test_router_tag_regex_routing.py
+++ b/tests/unit/router_strategy/test_router_tag_regex_routing.py
@@ -121,6 +121,7 @@ async def test_claude_code_ua_routes_to_cc_deployment():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=ALL_DEPLOYMENTS,
+        request_deployments=ALL_DEPLOYMENTS,
         request_kwargs={"metadata": {"user_agent": "claude-code/1.2.3"}},
     )
     assert len(result) == 1
@@ -135,6 +136,7 @@ async def test_regular_ua_routes_to_default_deployment():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=ALL_DEPLOYMENTS,
+        request_deployments=ALL_DEPLOYMENTS,
         request_kwargs={"metadata": {"user_agent": "Mozilla/5.0 (browser)"}},
     )
     assert len(result) == 1
@@ -149,6 +151,7 @@ async def test_no_ua_routes_to_default_deployment():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=ALL_DEPLOYMENTS,
+        request_deployments=ALL_DEPLOYMENTS,
         request_kwargs={"metadata": {}},
     )
     assert len(result) == 1
@@ -164,6 +167,7 @@ async def test_tag_routing_metadata_written_for_regex_match():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=ALL_DEPLOYMENTS,
+        request_deployments=ALL_DEPLOYMENTS,
         request_kwargs={"metadata": metadata},
     )
     assert "tag_routing" in metadata
@@ -181,6 +185,7 @@ async def test_tag_filtering_disabled_returns_all_deployments():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=ALL_DEPLOYMENTS,
+        request_deployments=ALL_DEPLOYMENTS,
         request_kwargs={"metadata": {"user_agent": "claude-code/1.0"}},
     )
     assert result == ALL_DEPLOYMENTS
@@ -199,6 +204,7 @@ async def test_empty_healthy_deployments_with_request_tags_returns_empty_list():
         llm_router_instance=router,
         model="gpt-5.2",
         healthy_deployments=[],
+        request_deployments=[],
         request_kwargs={
             "metadata": {"tags": ["client_id:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"]}
         },
@@ -228,6 +234,7 @@ async def test_explicit_tag_match_takes_precedence_over_regex():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=[deployment_with_both],
+        request_deployments=[deployment_with_both],
         request_kwargs={"metadata": metadata},
     )
     assert len(result) == 1
@@ -269,6 +276,7 @@ async def test_user_agent_present_no_tag_regex_deployments_does_not_raise():
         llm_router_instance=router,
         model="gpt-4",
         healthy_deployments=plain_tag_only_deployments,
+        request_deployments=plain_tag_only_deployments,
         request_kwargs={"metadata": {"user_agent": "Mozilla/5.0 (any-client)"}},
     )
     # Falls through to "return healthy_deployments" path unchanged
@@ -305,6 +313,7 @@ async def test_tag_routing_metadata_not_overwritten_for_multiple_matches():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=[deployment_a, deployment_b],
+        request_deployments=[deployment_a, deployment_b],
         request_kwargs={"metadata": metadata},
     )
     assert len(result) == 2
@@ -357,6 +366,7 @@ async def test_match_any_false_strict_tag_check_blocks_regex_fallback():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=[deployment_strict, default_deployment],
+        request_deployments=[deployment_strict, default_deployment],
         request_kwargs={"metadata": metadata},
     )
     ids = [d["model_info"]["id"] for d in result]
@@ -387,6 +397,7 @@ async def test_match_any_false_regex_only_deployment_still_matches():
         llm_router_instance=router,
         model="claude-sonnet",
         healthy_deployments=[regex_only_deployment],
+        request_deployments=[regex_only_deployment],
         request_kwargs={"metadata": {"user_agent": "claude-code/1.0"}},
     )
     assert len(result) == 1
diff --git a/tests/unit/router_strategy/test_router_tag_routing.py b/tests/unit/router_strategy/test_router_tag_routing.py
index 57c0177f9b4..5738bf86ccc 100644
--- a/tests/unit/router_strategy/test_router_tag_routing.py
+++ b/tests/unit/router_strategy/test_router_tag_routing.py
@@ -3,12 +3,15 @@
 
 
 import logging
-from typing import Final
+from typing import Final, Literal
+from unittest.mock import patch
 
 import pytest
 
 import litellm
 from litellm._logging import verbose_logger
+from litellm.responses.utils import ResponsesAPIRequestUtils
+from litellm.types.router import RouterErrors
 
 
 async def _routed_model_ids(
@@ -1365,14 +1368,17 @@ def test_chain_allows_fail_open_true_when_any_member_sets_flag():
         {"model_info": {}, "litellm_params": {"tags": ["provider:anthropic"]}},
         {"model_info": {"allow_fail_open": True}, "litellm_params": {"tags": ["provider:openai"]}},
     ]
-    assert _chain_allows_fail_open(deployments, frozenset(), frozenset({"provider:anthropic"}), frozenset()) is True
+    assert (
+        _chain_allows_fail_open(deployments, deployments, frozenset(), frozenset({"provider:anthropic"}), frozenset())
+        is True
+    )
 
 
 def test_chain_allows_fail_open_false_by_default():
     from litellm.router_strategy.tag_based_routing import _chain_allows_fail_open
 
     deployments = [{"model_info": {}}, {}]
-    assert _chain_allows_fail_open(deployments, frozenset(), frozenset(), frozenset()) is False
+    assert _chain_allows_fail_open(deployments, deployments, frozenset(), frozenset(), frozenset()) is False
 
 
 def test_chain_allows_fail_open_true_when_no_required_tag_is_known_at_all():
@@ -1384,7 +1390,10 @@ def test_chain_allows_fail_open_true_when_no_required_tag_is_known_at_all():
     deployments = [
         {"model_info": {"allow_fail_open": True}, "litellm_params": {"tags": ["default", "reasoning_type:low"]}},
     ]
-    assert _chain_allows_fail_open(deployments, frozenset(), frozenset({"reasoning_type:high"}), frozenset()) is True
+    assert (
+        _chain_allows_fail_open(deployments, deployments, frozenset(), frozenset({"reasoning_type:high"}), frozenset())
+        is True
+    )
 
 
 def test_unknown_required_tag_hides_an_answer_denies_fail_open():
@@ -1405,7 +1414,11 @@ def test_unknown_required_tag_hides_an_answer_denies_fail_open():
     # fail-open must be denied even though the flag is set on the group.
     assert (
         _chain_allows_fail_open(
-            deployments, frozenset(), frozenset({"region:us-east", "totally-invented-tag-nobody-has"}), frozenset()
+            deployments,
+            deployments,
+            frozenset(),
+            frozenset({"region:us-east", "totally-invented-tag-nobody-has"}),
+            frozenset(),
         )
         is False
     )
@@ -1432,7 +1445,9 @@ def test_unknown_required_tag_allows_fail_open_when_no_answer_is_hidden():
     # carries both, so this is a genuinely unsatisfiable combination, not an invented
     # tag masking a narrower answer. Fail-open must proceed normally.
     assert (
-        _chain_allows_fail_open(deployments, frozenset(), frozenset({"region:us-east", "region:eu"}), frozenset())
+        _chain_allows_fail_open(
+            deployments, deployments, frozenset(), frozenset({"region:us-east", "region:eu"}), frozenset()
+        )
         is True
     )
 
@@ -1494,8 +1509,8 @@ def test_chain_allows_fail_open_true_when_prefixed_unknown_required_tag_is_confi
         },
     ]
     required_set = frozenset({"provider:anthropic", "typo-tag"})
-    assert _chain_allows_fail_open(deployments, frozenset(), required_set, frozenset()) is False
-    assert _chain_allows_fail_open(deployments, frozenset(), required_set, required_set) is True
+    assert _chain_allows_fail_open(deployments, deployments, frozenset(), required_set, frozenset()) is False
+    assert _chain_allows_fail_open(deployments, deployments, frozenset(), required_set, required_set) is True
 
 
 # --- get_deployments_for_tag required-AND ("&") integration tests ---
@@ -1763,6 +1778,141 @@ async def test_required_and_combined_with_positive_unmatched_raises_by_default()
 # --- get_deployments_for_tag allow_fail_open integration tests ---
 
 
+def _fail_open_router(opted_in_group: str | None = "chat", route: str = "model") -> litellm.Router:
+    model_name: Final = "chat-*" if route == "wildcard" else "chat"
+    team_info: Final = {"team_id": "team-a", "team_public_model_name": "public-chat"} if route == "team" else {}
+    return litellm.Router(
+        model_list=[
+            {
+                "model_name": model_name if opted_in_group in (None, "chat") else opted_in_group,
+                "litellm_params": {"model": "openai/gpt-6.1-sol", "api_key": "unused", "tags": ["vision"]},
+                "model_info": {"id": "opted-in", "allow_fail_open": opted_in_group is not None, **team_info},
+            },
+            {
+                "model_name": model_name,
+                "litellm_params": {"model": "openai/gpt-6.1-sol", "api_key": "unused", "tags": ["region:eu"]},
+                "model_info": {"id": "remaining", **team_info},
+            },
+        ],
+        routing_groups=(
+            [{"group_name": "public-chat", "models": ["chat"], "routing_strategy": "simple-shuffle"}]
+            if route == "routing_group"
+            else None
+        ),
+        model_group_alias={"public-chat": "chat"} if route == "alias" else {},
+        enable_tag_filtering=True,
+        optional_pre_call_checks=["responses_api_deployment_check"],
+    )
+
+
+def _response_id_for_remaining_deployment() -> str:
+    return ResponsesAPIRequestUtils._build_responses_api_response_id(
+        custom_llm_provider="openai", model_id="remaining", response_id="resp_previous"
+    )
+
+
+@pytest.mark.asyncio()
+@pytest.mark.parametrize("narrowing", ("affinity", "cooldown"))
+@pytest.mark.parametrize("tags", (("component:chat-search",), ("&vision",), ("!region:eu",)))
+@pytest.mark.parametrize("route", ("model", "routing_group", "wildcard", "team", "alias"))
+async def test_tag_fail_open_survives_deployment_narrowing(
+    narrowing: Literal["affinity", "cooldown"], tags: tuple[str, ...], route: str
+) -> None:
+    router: Final = _fail_open_router(route=route)
+    requested_model: Final = "chat" if route == "model" else "chat-test" if route == "wildcard" else "public-chat"
+    with patch("time.time", return_value=1_700_000_000.0):
+        if narrowing == "cooldown":
+            router.cooldown_cache.add_deployment_to_cooldown(
+                model_id="opted-in",
+                original_exception=RuntimeError("unavailable"),
+                exception_status=500,
+                cooldown_time=60,
+            )
+        candidates: Final = await router.async_get_healthy_deployments(
+            model=requested_model,
+            request_kwargs={
+                "litellm_metadata": {"tags": list(tags), "inherited_tags": [], "user_api_key_team_id": "team-a"},
+                **(
+                    {"previous_response_id": _response_id_for_remaining_deployment()} if narrowing == "affinity" else {}
+                ),
+            },
+        )
+    assert isinstance(candidates, (list, tuple))
+    assert tuple(deployment["model_info"]["id"] for deployment in candidates) == ("remaining",)
+
+
+@pytest.mark.asyncio()
+@pytest.mark.parametrize("route", ("routing_group", "wildcard", "team", "alias"))
+async def test_tag_fail_open_resolves_public_model_names(route: str) -> None:
+    router: Final = _fail_open_router(route=route)
+    candidates: Final = await router.async_get_healthy_deployments(
+        model="chat-test" if route == "wildcard" else "public-chat",
+        request_kwargs={
+            "litellm_metadata": {"tags": ["component:chat-search"], "user_api_key_team_id": "team-a"},
+        },
+    )
+    assert isinstance(candidates, (list, tuple))
+    assert {deployment["model_info"]["id"] for deployment in candidates} == {"opted-in", "remaining"}
+
+
+@pytest.mark.asyncio()
+@pytest.mark.parametrize("opted_in_group", (None, "other-group"))
+async def test_tag_fail_open_requires_opt_in_in_the_requested_group(opted_in_group: str | None) -> None:
+    router: Final = _fail_open_router(opted_in_group)
+    with pytest.raises(ValueError, match=RouterErrors.no_deployments_with_tag_routing.value):
+        await router.async_get_healthy_deployments(
+            model="chat",
+            request_kwargs={
+                "previous_response_id": _response_id_for_remaining_deployment(),
+                "litellm_metadata": {"tags": ["component:chat-search"], "inherited_tags": []},
+            },
+        )
+
+
+@pytest.mark.asyncio()
+async def test_tag_fail_open_does_not_use_another_teams_opt_in() -> None:
+    router: Final = litellm.Router(
+        model_list=[
+            {
+                "model_name": "chat",
+                "litellm_params": {"model": "openai/gpt-6.1-sol", "api_key": "unused"},
+                "model_info": {
+                    "id": team_id,
+                    "team_id": team_id,
+                    "team_public_model_name": "public-chat",
+                    "allow_fail_open": team_id == "team-a",
+                },
+            }
+            for team_id in ("team-a", "team-b")
+        ],
+        enable_tag_filtering=True,
+    )
+    with pytest.raises(ValueError, match=RouterErrors.no_deployments_with_tag_routing.value):
+        await router.async_get_healthy_deployments(
+            model="public-chat",
+            request_kwargs={
+                "litellm_metadata": {"tags": ["component:chat-search"], "user_api_key_team_id": "team-b"},
+            },
+        )
+
+
+@pytest.mark.asyncio()
+@pytest.mark.parametrize("inherited_tag", ("&vision", "!region:eu"))
+async def test_tag_fail_open_preserves_inherited_policy_after_affinity(inherited_tag: str) -> None:
+    router: Final = _fail_open_router()
+    with pytest.raises(ValueError, match=RouterErrors.no_deployments_with_tag_routing.value):
+        await router.async_get_healthy_deployments(
+            model="chat",
+            request_kwargs={
+                "previous_response_id": _response_id_for_remaining_deployment(),
+                "litellm_metadata": {
+                    "tags": [inherited_tag, "component:chat-search"],
+                    "inherited_tags": [inherited_tag],
+                },
+            },
+        )
+
+
 @pytest.mark.asyncio()
 async def test_allow_fail_open_required_and_unmatched_falls_back_to_default_pool():
     router = litellm.Router(
diff --git a/tests/unit/router_utils/pre_call_checks/test_prompt_caching_deployment_check.py b/tests/unit/router_utils/pre_call_checks/test_prompt_caching_deployment_check.py
index 5f018ab5dda..5b31e0e5e3b 100644
--- a/tests/unit/router_utils/pre_call_checks/test_prompt_caching_deployment_check.py
+++ b/tests/unit/router_utils/pre_call_checks/test_prompt_caching_deployment_check.py
@@ -1236,3 +1236,58 @@ async def test_router_with_prompt_caching(anthropic_messages):
         print("response=", response)
 
         assert response._hidden_params["model_id"] == initial_model_id
+
+
+class _LoggedMessagesProbe(CustomLogger):
+    def __init__(self) -> None:
+        self.logged_messages: list[object] = []
+
+    async def async_log_success_event(self, kwargs, response_obj, start_time, end_time):
+        self.logged_messages.append((kwargs["standard_logging_object"]["messages"], kwargs["messages"]))
+
+
+@pytest.mark.asyncio
+async def test_pin_is_written_with_message_logging_off_while_loggers_still_see_redacted_messages(
+    monkeypatch, local_model_cost_map
+):
+    """
+    `turn_off_message_logging` redacted the shared success-event payload before the check read it, so the
+    pin was keyed off `redacted-by-litellm`, never written, and a cacheable conversation bounced across the
+    group. The pin must land whatever the flag says, while a real logger alongside still sees only the
+    redacted messages.
+    """
+    monkeypatch.setattr(litellm, "turn_off_message_logging", True)
+    monkeypatch.setattr(litellm, "enable_anthropic_prompt_caching", False)
+    probe = _LoggedMessagesProbe()
+    monkeypatch.setattr(litellm, "callbacks", [probe])
+    router = litellm.Router(
+        model_list=[
+            {
+                "model_name": MODEL_GROUP_ALIAS,
+                "litellm_params": {"model": "anthropic/claude-opus-4-6", "api_key": "sk-fake"},
+                "model_info": {"id": model_id},
+            }
+            for model_id in ("dep-1", "dep-2")
+        ],
+        optional_pre_call_checks=["prompt_caching"],
+    )
+    messages = _messages(word_count=5000)
+
+    first = await router.acompletion(model=MODEL_GROUP_ALIAS, messages=messages, mock_response="ok")
+    served_by = first._hidden_params["model_id"]
+
+    affinity_key = PromptCachingCache.get_prompt_caching_cache_key(messages, None)
+    pin = await _eventually(lambda: router.prompt_caching_pin_cache.get_cache(key=affinity_key))
+    assert pin == {"model_id": served_by}, pin
+
+    subsequent = [
+        (await router.acompletion(model=MODEL_GROUP_ALIAS, messages=messages, mock_response="ok"))._hidden_params[
+            "model_id"
+        ]
+        for _ in range(4)
+    ]
+    assert subsequent == [served_by] * 4
+
+    await _eventually(lambda: len(probe.logged_messages) == 5)
+    redacted = [{"role": "user", "content": "redacted-by-litellm"}]
+    assert probe.logged_messages == [(redacted, redacted)] * 5, probe.logged_messages
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index df1a6a71bb5..58ed951540e 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -98,6 +98,7 @@ from litellm.utils import (
     _snapshot_exception_for_hook,
     async_post_call_failure_deployment_hook,
     async_post_call_success_deployment_hook,
+    async_pre_call_deployment_hook,
     calculate_max_parallel_requests,
     client,
     get_non_default_completion_params,
@@ -10053,3 +10054,25 @@ def test_get_optional_params_forwards_a_tool_config_cache_point_to_a_downstream_
     )
 
     assert optional_params["extra_body"] == {"kept": True, "cache_control_injection_points": [point]}
+
+
+class _RecordingPreCallDeploymentHook(CustomLogger):
+    def __init__(self) -> None:
+        super().__init__()
+        self.seen_call_types: tuple[CallTypes | None, ...] = ()
+
+    async def async_pre_call_deployment_hook(
+        self, kwargs: dict[str, object], call_type: CallTypes | None
+    ) -> dict[str, object] | None:
+        self.seen_call_types = (*self.seen_call_types, call_type)
+        return None
+
+
+@pytest.mark.asyncio
+async def test_pre_call_deployment_hook_hands_responses_compact_its_call_type(monkeypatch: pytest.MonkeyPatch) -> None:
+    hook: Final = _RecordingPreCallDeploymentHook()
+    monkeypatch.setattr(litellm, "callbacks", [hook])
+
+    await async_pre_call_deployment_hook({"model": "gpt-5.4-mini"}, "acompact_responses")
+
+    assert hook.seen_call_types == (CallTypes.acompact_responses,)
diff --git a/tests/unit/types/test_utils.py b/tests/unit/types/test_utils.py
index 32479c62372..bdbcbb698d4 100644
--- a/tests/unit/types/test_utils.py
+++ b/tests/unit/types/test_utils.py
@@ -1,7 +1,12 @@
 import pytest
 
 from litellm.litellm_core_utils.initialize_dynamic_callback_params import validate_excluded_services_value
-from litellm.types.utils import CAPTURE_MESSAGE_CONTENT_VALUES, CaptureMessageContent, captures_span_content
+from litellm.types.utils import (
+    CAPTURE_MESSAGE_CONTENT_VALUES,
+    CallTypes,
+    CaptureMessageContent,
+    captures_span_content,
+)
 
 
 @pytest.mark.parametrize("value", ["", "  ", "auth", "none,redis", "redis,", ",postgres"])
@@ -45,3 +50,8 @@ def test_capture_message_content_constructor_accepts_any_string() -> None:
 )
 def test_captures_span_content(mode: str | None, captures: bool) -> None:
     assert captures_span_content(mode) is captures
+
+
+@pytest.mark.parametrize("call_type", ["compact_responses", "acompact_responses"])
+def test_responses_compact_call_types_round_trip_their_public_names(call_type: str) -> None:
+    assert CallTypes(call_type).value == call_type
diff --git a/ui/litellm-dashboard/src/components/llm_calls/responses_api.test.tsx b/ui/litellm-dashboard/src/components/llm_calls/responses_api.test.tsx
index 2d98b29173d..ef630dd6946 100644
--- a/ui/litellm-dashboard/src/components/llm_calls/responses_api.test.tsx
+++ b/ui/litellm-dashboard/src/components/llm_calls/responses_api.test.tsx
@@ -138,6 +138,46 @@ describe("responses_api", () => {
     expect(onTimingData).not.toHaveBeenCalled();
   });
 
+  it.each([
+    [["__all__"], [], [{ server_label: "litellm", server_url: "litellm_proxy/mcp" }]],
+    [
+      ["server-1"],
+      [{ server_id: "server-1", server_name: "my server" }],
+      [{ server_label: "my server", server_url: "litellm_proxy/mcp/my server" }],
+    ],
+  ])(
+    "sends MCP selection %j as gateway references the proxy runs for any model",
+    async (selected, servers, expected) => {
+      await makeOpenAIResponsesRequest(
+        messages,
+        mockUpdateTextUI,
+        "gemini-pro",
+        "test-token",
+        undefined, // tags
+        undefined, // signal
+        undefined, // onReasoningContent
+        undefined, // onTimingData
+        undefined, // onUsageData
+        undefined, // traceId
+        undefined, // vector_store_ids
+        undefined, // guardrails
+        undefined, // policies
+        selected,
+        undefined, // previousResponseId
+        undefined, // onResponseId
+        undefined, // onMCPEvent
+        undefined, // codeInterpreterEnabled
+        undefined, // onCodeInterpreterResult
+        undefined, // customBaseUrl
+        servers as never,
+      );
+
+      expect(mockResponsesCreate.mock.calls[0][0].tools).toEqual(
+        expected.map((tool) => ({ type: "mcp", require_approval: "never", ...tool })),
+      );
+    },
+  );
+
   it("should report total latency in both streaming and non-streaming modes", async () => {
     const onTotalLatency = vi.fn();
     const callWithStreaming = (streamingEnabled: boolean) =>
@@ -406,14 +446,14 @@ describe("responses_api", () => {
       {
         type: "mcp",
         server_label: "Alpha",
-        server_url: "https://backend.example.com/mcp/Alpha",
+        server_url: "litellm_proxy/mcp/Alpha",
         require_approval: "never",
         allowed_tools: ["toolA"],
       },
       {
         type: "mcp",
         server_label: "Beta",
-        server_url: "https://backend.example.com/mcp/Beta",
+        server_url: "litellm_proxy/mcp/Beta",
         require_approval: "never",
         allowed_tools: ["toolB", "toolC"],
       },
diff --git a/ui/litellm-dashboard/src/components/llm_calls/responses_api.tsx b/ui/litellm-dashboard/src/components/llm_calls/responses_api.tsx
index 1f717e488e9..82fcb699fb1 100644
--- a/ui/litellm-dashboard/src/components/llm_calls/responses_api.tsx
+++ b/ui/litellm-dashboard/src/components/llm_calls/responses_api.tsx
@@ -1,11 +1,12 @@
 import openai from "openai";
 import { MessageType } from "../chat_ui/types";
 import { TokenUsage } from "../chat_ui/ResponseMetrics";
-import { getGatewayBaseUrl, getProxyBaseUrl } from "@/components/networking";
+import { getGatewayBaseUrl } from "@/components/networking";
 import { toast } from "@/lib/toast";
 import { extractPromptCacheTokens } from "@/utils/promptCacheUsage";
 import { parseUsageCost } from "./usage_cost";
 import { buildPlaygroundHeaders, type CustomHeaders } from "./request_headers";
+import { buildMcpToolBlocks, type BuildMcpToolBlocksArgs } from "./mcp_tool_blocks";
 import type { MCPEvent } from "@/components/mcp_tools/types";
 import { MCPServer, MCPToolset } from "@/components/mcp_tools/types";
 import {
@@ -103,7 +104,6 @@ export async function makeOpenAIResponsesRequest(
   }
 
   const proxyBaseUrl = customBaseUrl || getGatewayBaseUrl();
-  const mcpBaseUrl = customBaseUrl || getProxyBaseUrl();
   const headers = buildPlaygroundHeaders(tags, customHeaders);
 
   const client = new openai.OpenAI({
@@ -137,50 +137,13 @@ export async function makeOpenAIResponsesRequest(
     });
 
     // Build tools array
-    const tools: any[] = [];
-
-    // Add MCP servers if selected
-    if (selectedMCPServers && selectedMCPServers.length > 0) {
-      if (selectedMCPServers.includes("__all__")) {
-        // All MCP Servers selected
-        tools.push({
-          type: "mcp",
-          server_label: "litellm",
-          server_url: `${mcpBaseUrl}/mcp`,
-          require_approval: "never",
-        });
-      } else {
-        // Individual servers/toolsets selected - create one entry per item
-        selectedMCPServers.forEach((serverId) => {
-          if (serverId.startsWith("toolset:")) {
-            // Toolset: same /{name}/mcp pattern as individual servers
-            const toolsetId = serverId.slice("toolset:".length);
-            const toolset = mcpToolsets?.find((t) => t.toolset_id === toolsetId);
-            const toolsetName = toolset?.toolset_name || toolsetId;
-            tools.push({
-              type: "mcp",
-              server_label: toolsetName,
-              server_url: `${mcpBaseUrl}/mcp/${encodeURIComponent(toolsetName)}`,
-              require_approval: "never",
-            });
-          } else {
-            const server = mcpServers?.find((s) => s.server_id === serverId);
-            // Use server_name for both routing and labelling. server_name is the
-            // unique registered identifier; aliases can collide across servers.
-            const routeName = server?.server_name || serverId;
-            const allowedTools = mcpServerToolRestrictions?.[serverId] || [];
-
-            tools.push({
-              type: "mcp",
-              server_label: routeName, // unique per request — collisions cause silent tool-routing failures
-              server_url: `${mcpBaseUrl}/mcp/${encodeURIComponent(routeName)}`,
-              require_approval: "never",
-              ...(allowedTools.length > 0 ? { allowed_tools: allowedTools } : {}),
-            });
-          }
-        });
-      }
-    }
+    const mcpSelection: BuildMcpToolBlocksArgs = {
+      selectedMCPServers,
+      mcpServers,
+      mcpToolsets,
+      mcpServerToolRestrictions,
+    };
+    const tools: any[] = buildMcpToolBlocks(mcpSelection);
 
     // Add code_interpreter tool if enabled (OpenAI auto-creates container)
     if (codeInterpreterEnabled) {
diff --git a/ui/litellm-dashboard/src/lib/http/schema.d.ts b/ui/litellm-dashboard/src/lib/http/schema.d.ts
index 89cc9157359..13b84896a84 100644
--- a/ui/litellm-dashboard/src/lib/http/schema.d.ts
+++ b/ui/litellm-dashboard/src/lib/http/schema.d.ts
@@ -28370,7 +28370,7 @@ export interface components {
          * CallTypes
          * @enum {string}
          */
-        CallTypes: "embedding" | "aembedding" | "completion" | "acompletion" | "atext_completion" | "text_completion" | "image_generation" | "aimage_generation" | "image_edit" | "aimage_edit" | "moderation" | "amoderation" | "atranscription" | "transcription" | "aspeech" | "speech" | "rerank" | "arerank" | "search" | "asearch" | "decisions" | "adecisions" | "systemone" | "asystemone" | "_arealtime" | "_aresponses_websocket" | "create_batch" | "acreate_batch" | "aretrieve_batch" | "retrieve_batch" | "acancel_batch" | "cancel_batch" | "pass_through_endpoint" | "anthropic_messages" | "aanthropic_messages" | "get_assistants" | "aget_assistants" | "create_assistants" | "acreate_assistants" | "delete_assistant" | "adelete_assistant" | "acreate_thread" | "create_thread" | "aget_thread" | "get_thread" | "a_add_message" | "add_message" | "aget_messages" | "get_messages" | "arun_thread" | "run_thread" | "arun_thread_stream" | "run_thread_stream" | "afile_retrieve" | "file_retrieve" | "afile_delete" | "file_delete" | "afile_list" | "file_list" | "acreate_file" | "create_file" | "afile_content" | "file_content" | "create_fine_tuning_job" | "acreate_fine_tuning_job" | "create_video" | "acreate_video" | "video_generation" | "avideo_generation" | "avideo_retrieve" | "video_retrieve" | "avideo_content" | "video_content" | "video_remix" | "avideo_remix" | "video_list" | "avideo_list" | "video_retrieve_job" | "avideo_retrieve_job" | "video_delete" | "avideo_delete" | "video_create_character" | "avideo_create_character" | "video_get_character" | "avideo_get_character" | "video_edit" | "avideo_edit" | "video_extension" | "avideo_extension" | "vector_store_file_create" | "avector_store_file_create" | "vector_store_file_list" | "avector_store_file_list" | "vector_store_file_retrieve" | "avector_store_file_retrieve" | "vector_store_file_content" | "avector_store_file_content" | "vector_store_file_update" | "avector_store_file_update" | "vector_store_file_delete" | "avector_store_file_delete" | "vector_store_create" | "avector_store_create" | "vector_store_search" | "avector_store_search" | "ingest" | "aingest" | "query" | "aquery" | "create_interaction" | "acreate_interaction" | "create_container" | "acreate_container" | "list_containers" | "alist_containers" | "retrieve_container" | "aretrieve_container" | "delete_container" | "adelete_container" | "list_container_files" | "alist_container_files" | "upload_container_file" | "aupload_container_file" | "create_sandbox" | "acreate_sandbox" | "delete_sandbox" | "adelete_sandbox" | "run_code" | "arun_code" | "code_interpreter_tool" | "acode_interpreter_tool" | "acancel_fine_tuning_job" | "cancel_fine_tuning_job" | "alist_fine_tuning_jobs" | "list_fine_tuning_jobs" | "aretrieve_fine_tuning_job" | "retrieve_fine_tuning_job" | "responses" | "aresponses" | "alist_input_items" | "llm_passthrough_route" | "allm_passthrough_route" | "generate_content" | "agenerate_content" | "generate_content_stream" | "agenerate_content_stream" | "ocr" | "aocr" | "call_mcp_tool" | "list_mcp_tools" | "asend_message" | "send_message" | "acreate_skill";
+        CallTypes: "embedding" | "aembedding" | "completion" | "acompletion" | "atext_completion" | "text_completion" | "image_generation" | "aimage_generation" | "image_edit" | "aimage_edit" | "moderation" | "amoderation" | "atranscription" | "transcription" | "aspeech" | "speech" | "rerank" | "arerank" | "search" | "asearch" | "decisions" | "adecisions" | "systemone" | "asystemone" | "_arealtime" | "_aresponses_websocket" | "create_batch" | "acreate_batch" | "aretrieve_batch" | "retrieve_batch" | "acancel_batch" | "cancel_batch" | "pass_through_endpoint" | "anthropic_messages" | "aanthropic_messages" | "get_assistants" | "aget_assistants" | "create_assistants" | "acreate_assistants" | "delete_assistant" | "adelete_assistant" | "acreate_thread" | "create_thread" | "aget_thread" | "get_thread" | "a_add_message" | "add_message" | "aget_messages" | "get_messages" | "arun_thread" | "run_thread" | "arun_thread_stream" | "run_thread_stream" | "afile_retrieve" | "file_retrieve" | "afile_delete" | "file_delete" | "afile_list" | "file_list" | "acreate_file" | "create_file" | "afile_content" | "file_content" | "create_fine_tuning_job" | "acreate_fine_tuning_job" | "create_video" | "acreate_video" | "video_generation" | "avideo_generation" | "avideo_retrieve" | "video_retrieve" | "avideo_content" | "video_content" | "video_remix" | "avideo_remix" | "video_list" | "avideo_list" | "video_retrieve_job" | "avideo_retrieve_job" | "video_delete" | "avideo_delete" | "video_create_character" | "avideo_create_character" | "video_get_character" | "avideo_get_character" | "video_edit" | "avideo_edit" | "video_extension" | "avideo_extension" | "vector_store_file_create" | "avector_store_file_create" | "vector_store_file_list" | "avector_store_file_list" | "vector_store_file_retrieve" | "avector_store_file_retrieve" | "vector_store_file_content" | "avector_store_file_content" | "vector_store_file_update" | "avector_store_file_update" | "vector_store_file_delete" | "avector_store_file_delete" | "vector_store_create" | "avector_store_create" | "vector_store_search" | "avector_store_search" | "ingest" | "aingest" | "query" | "aquery" | "create_interaction" | "acreate_interaction" | "create_container" | "acreate_container" | "list_containers" | "alist_containers" | "retrieve_container" | "aretrieve_container" | "delete_container" | "adelete_container" | "list_container_files" | "alist_container_files" | "upload_container_file" | "aupload_container_file" | "create_sandbox" | "acreate_sandbox" | "delete_sandbox" | "adelete_sandbox" | "run_code" | "arun_code" | "code_interpreter_tool" | "acode_interpreter_tool" | "acancel_fine_tuning_job" | "cancel_fine_tuning_job" | "alist_fine_tuning_jobs" | "list_fine_tuning_jobs" | "aretrieve_fine_tuning_job" | "retrieve_fine_tuning_job" | "responses" | "aresponses" | "get_responses" | "aget_responses" | "delete_responses" | "adelete_responses" | "cancel_responses" | "acancel_responses" | "compact_responses" | "acompact_responses" | "alist_input_items" | "llm_passthrough_route" | "allm_passthrough_route" | "generate_content" | "agenerate_content" | "generate_content_stream" | "agenerate_content_stream" | "ocr" | "aocr" | "call_mcp_tool" | "list_mcp_tools" | "asend_message" | "send_message" | "acreate_skill";
         /** CallbackDelete */
         CallbackDelete: {
             /** Callback Name */
diff --git a/uv.lock b/uv.lock
index 256af26776d..0560d07f501 100644
--- a/uv.lock
+++ b/uv.lock
@@ -6194,11 +6194,11 @@ wheels = [
 
 [[package]]
 name = "oauthlib"
-version = "4.0.0"
+version = "4.0.1"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/7a/d8/a1bcc8ba112a627f8ffbdc212a78ce18d3ac07e91a5ca65d27918eee25a1/oauthlib-4.0.0.tar.gz", hash = "sha256:efb274799819440f95b4ab3b818869f1ce9ae26c5beacba0201d1a1b76b54f86", size = 187232, upload-time = "2026-09-28T06:01:18.77Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/33/17/2bb072de0b990303c985f26869fd47bb179024a051f47e7f9d208eb92f8e/oauthlib-4.0.1.tar.gz", hash = "sha256:3d73febdb6faa00f277c81fb04be7b7586fb96fc3b7f0b9c772dada69a25ede7", size = 191219, upload-time = "2026-10-31T09:52:58.008Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/d9/f4/78229a1066068ca14fc60fb26cf7381cabe4382261392b90e5f9552722d4/oauthlib-4.0.0-py3-none-any.whl", hash = "sha256:624c28c13a0a59cabf9747dfa52af63be3e512a7f2714df16e91b5b3a145e6cd", size = 159715, upload-time = "2026-09-28T06:01:17.008Z" },
+    { url = "https://files.pythonhosted.org/packages/df/ef/3b8adde1b32a6f540758bff734d3442c621734c83708e5f02b0ba2f43b84/oauthlib-4.0.1-py3-none-any.whl", hash = "sha256:498a298876e996301950a5b053d12c31628bb7b895db03666430c69ce182eb61", size = 161934, upload-time = "2026-10-31T09:52:56.206Z" },
 ]
 
 [[package]]