From 7ad4513b6e3dc4c2bbbb6b9852be312dbeef4916 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Thu, 15 Oct 2026 08:03:18 +0000
Subject: [PATCH 1/7] refactor: clean up fresh tech debt in proxy sub-call
 budget checks, model search and logger init

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/litellm_core_utils/litellm_logging.py            | 2 +-
 .../llms/anthropic/pass_through/caller_model_checks.py   | 9 +++------
 litellm/proxy/proxy_server.py                            | 3 ---
 3 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/litellm/litellm_core_utils/litellm_logging.py b/litellm/litellm_core_utils/litellm_logging.py
index 9b10b95956f..46cb4e38575 100644
--- a/litellm/litellm_core_utils/litellm_logging.py
+++ b/litellm/litellm_core_utils/litellm_logging.py
@@ -5279,7 +5279,7 @@ def _init_custom_logger_compatible_class(
     logging_integration: str,
     internal_usage_cache: DualCache | None,
     llm_router: object,
-    custom_logger_init_args: dict[str, object] | None = {},
+    custom_logger_init_args: dict[str, object] | None = None,
     raise_import_errors: bool = False,
 ) -> CustomLogger | None:
     """
diff --git a/litellm/llms/anthropic/pass_through/caller_model_checks.py b/litellm/llms/anthropic/pass_through/caller_model_checks.py
index 7eb6a8f9266..af83207a245 100644
--- a/litellm/llms/anthropic/pass_through/caller_model_checks.py
+++ b/litellm/llms/anthropic/pass_through/caller_model_checks.py
@@ -243,8 +243,7 @@ async def caller_within_model_budget(
         return "allowed"
 
     model_max_budget: Final = getattr(user_api_key_auth, "model_max_budget", None)
-    token: Final = getattr(user_api_key_auth, "token", None)
-    if isinstance(model_max_budget, dict) and model_max_budget and token is not None:
+    if isinstance(model_max_budget, dict) and model_max_budget and user_api_key_auth.token is not None:
         try:
             await model_max_budget_limiter.is_key_within_model_budget(
                 user_api_key_dict=user_api_key_auth,
@@ -299,10 +298,8 @@ async def caller_within_model_budget(
             )
             return "denied_for_now"
 
-    end_user_model_max_budget: Final[dict[str, object] | None] = getattr(
-        user_api_key_auth, "end_user_model_max_budget", None
-    )
-    end_user_id: Final[str | None] = getattr(user_api_key_auth, "end_user_id", None)
+    end_user_model_max_budget: Final[dict[str, object] | None] = user_api_key_auth.end_user_model_max_budget
+    end_user_id: Final[str | None] = user_api_key_auth.end_user_id
     if isinstance(end_user_model_max_budget, dict) and end_user_model_max_budget and end_user_id is not None:
         try:
             await model_max_budget_limiter.is_end_user_within_model_budget(
diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index 03ab1752a92..daa2095a8e1 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -15287,9 +15287,6 @@ async def _apply_search_filter_to_models(
         team_public_model_name: Final = (m.get("model_info") or {}).get("team_public_model_name") or ""
         if search_lower in team_public_model_name.lower():
             return True
-        # Also match the underlying LiteLLM model name (e.g.
-        # "openrouter/deepseek/deepseek-chat"), so users can find
-        # deployments by typing the provider or the upstream model id.
         litellm_params: Final[Mapping[str, object]] = m.get("litellm_params") or MappingProxyType({})
         litellm_model: Final = litellm_params.get("model")
         return isinstance(litellm_model, str) and search_lower in litellm_model.lower()

From 68737c457cdb4d9684dadb0d473f5149b1116ccc Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Fri, 16 Oct 2026 08:06:33 +0000
Subject: [PATCH 2/7] refactor: clean up fresh tech debt in otel baggage
 metadata, model budget limiter and batch line items

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/batches/batch_line_items.py         | 2 +-
 litellm/integrations/otel/model/metadata.py | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/litellm/batches/batch_line_items.py b/litellm/batches/batch_line_items.py
index 3d175b22b90..6db685c708c 100644
--- a/litellm/batches/batch_line_items.py
+++ b/litellm/batches/batch_line_items.py
@@ -25,7 +25,7 @@ from litellm.types.utils import (
 
 BatchFileProvider: TypeAlias = Literal["openai", "azure", "vertex_ai", "hosted_vllm", "anthropic", "mistral"]
 
-_VERTEX_AI_UNKNOWN_CUSTOM_ID: Final = "unknown"  # what a Vertex AI batch row that carries no custom_id is read as
+_VERTEX_AI_UNKNOWN_CUSTOM_ID: Final = "unknown"
 _LINE: Final = re.compile(rb"[^\n]+")
 
 
diff --git a/litellm/integrations/otel/model/metadata.py b/litellm/integrations/otel/model/metadata.py
index cbbb1a9f6d4..6f93f0cc6f5 100644
--- a/litellm/integrations/otel/model/metadata.py
+++ b/litellm/integrations/otel/model/metadata.py
@@ -36,7 +36,7 @@ model. They coincide on the SDK path, which is correct.
 
 from __future__ import annotations
 
-from collections.abc import Callable, Iterator, Mapping
+from collections.abc import Iterator, Mapping
 from dataclasses import dataclass, field
 from datetime import datetime
 from types import MappingProxyType
@@ -132,7 +132,10 @@ class RequestIdentity:
         snapshot) is flattened to dotted keys so ``requester_metadata.<key>``
         resolves too.
         """
-        get: Final[Callable[[str], object]] = lambda name: _AUTH_ATTRIBUTE.validate_python(getattr(auth, name, None))  # noqa: E731
+
+        def get(name: str) -> object:
+            return _AUTH_ATTRIBUTE.validate_python(getattr(auth, name, None))
+
         auth_meta: Final = tuple(
             (meta_key, str(value))
             for meta_key, attr in (

From 638e2d753f336eb4892ecf81545582b98d8093e1 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Fri, 16 Oct 2026 08:07:42 +0000
Subject: [PATCH 3/7] Revert "refactor: clean up fresh tech debt in otel
 baggage metadata, model budget limiter and batch line items"

This reverts commit 68737c457cdb4d9684dadb0d473f5149b1116ccc.
---
 litellm/batches/batch_line_items.py         | 2 +-
 litellm/integrations/otel/model/metadata.py | 7 ++-----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/litellm/batches/batch_line_items.py b/litellm/batches/batch_line_items.py
index 6db685c708c..3d175b22b90 100644
--- a/litellm/batches/batch_line_items.py
+++ b/litellm/batches/batch_line_items.py
@@ -25,7 +25,7 @@ from litellm.types.utils import (
 
 BatchFileProvider: TypeAlias = Literal["openai", "azure", "vertex_ai", "hosted_vllm", "anthropic", "mistral"]
 
-_VERTEX_AI_UNKNOWN_CUSTOM_ID: Final = "unknown"
+_VERTEX_AI_UNKNOWN_CUSTOM_ID: Final = "unknown"  # what a Vertex AI batch row that carries no custom_id is read as
 _LINE: Final = re.compile(rb"[^\n]+")
 
 
diff --git a/litellm/integrations/otel/model/metadata.py b/litellm/integrations/otel/model/metadata.py
index 6f93f0cc6f5..cbbb1a9f6d4 100644
--- a/litellm/integrations/otel/model/metadata.py
+++ b/litellm/integrations/otel/model/metadata.py
@@ -36,7 +36,7 @@ model. They coincide on the SDK path, which is correct.
 
 from __future__ import annotations
 
-from collections.abc import Iterator, Mapping
+from collections.abc import Callable, Iterator, Mapping
 from dataclasses import dataclass, field
 from datetime import datetime
 from types import MappingProxyType
@@ -132,10 +132,7 @@ class RequestIdentity:
         snapshot) is flattened to dotted keys so ``requester_metadata.<key>``
         resolves too.
         """
-
-        def get(name: str) -> object:
-            return _AUTH_ATTRIBUTE.validate_python(getattr(auth, name, None))
-
+        get: Final[Callable[[str], object]] = lambda name: _AUTH_ATTRIBUTE.validate_python(getattr(auth, name, None))  # noqa: E731
         auth_meta: Final = tuple(
             (meta_key, str(value))
             for meta_key, attr in (

From 7bc96be5f51a508176e6c15d8fdc1bb41e624c0c Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Sat, 17 Oct 2026 08:14:05 +0000
Subject: [PATCH 4/7] refactor: clean up fresh tech debt in guardrail init,
 cost map fetch and stream continuation

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/litellm_core_utils/get_model_cost_map.py              | 4 +---
 litellm/litellm_core_utils/litellm_logging.py                 | 2 +-
 litellm/litellm_core_utils/streaming_handler.py               | 2 --
 .../guardrail_hooks/generic_guardrail_api/__init__.py         | 2 +-
 4 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/litellm/litellm_core_utils/get_model_cost_map.py b/litellm/litellm_core_utils/get_model_cost_map.py
index 6e3769260cc..676fde8cf04 100644
--- a/litellm/litellm_core_utils/get_model_cost_map.py
+++ b/litellm/litellm_core_utils/get_model_cost_map.py
@@ -318,9 +318,7 @@ def _classify_fetch_content(content: bytes, url: str, etag: str | None) -> _Fetc
         return ModelCostMapReloadUnavailable(reason=f"invalid JSON from {url}: {e}")
     if not isinstance(parsed, dict):
         return ModelCostMapReloadUnavailable(reason=f"expected a JSON object from {url}, got {type(parsed).__name__}")
-    model_cost_map: Final = cast(  # cast-ok: JSON object keys are strings by definition
-        dict[str, object], parsed
-    )
+    model_cost_map: Final = _BUNDLED_CATALOG_ADAPTER.validate_python(parsed)
     return ModelCostMapReloaded(model_cost_map=model_cost_map, revision=git_blob_id(content), etag=etag)
 
 
diff --git a/litellm/litellm_core_utils/litellm_logging.py b/litellm/litellm_core_utils/litellm_logging.py
index cd9b693431a..60d638a1453 100644
--- a/litellm/litellm_core_utils/litellm_logging.py
+++ b/litellm/litellm_core_utils/litellm_logging.py
@@ -2660,7 +2660,7 @@ class Logging(LiteLLMLoggingBaseClass):
         response: ModelResponse | TextCompletionResponse | ResponsesAPIResponse | InteractionsAPIResponse,
     ) -> ModelResponse | TextCompletionResponse | ResponsesAPIResponse | InteractionsAPIResponse:
         response_id: Final = self.model_call_details.get("continued_response_id")
-        if not isinstance(response_id, str) or getattr(response, "id", None) == response_id:
+        if not isinstance(response_id, str) or response.id == response_id:
             return response
         return response.model_copy(update={"id": response_id})
 
diff --git a/litellm/litellm_core_utils/streaming_handler.py b/litellm/litellm_core_utils/streaming_handler.py
index 78fb82c98e7..6263881fa8f 100644
--- a/litellm/litellm_core_utils/streaming_handler.py
+++ b/litellm/litellm_core_utils/streaming_handler.py
@@ -2362,8 +2362,6 @@ class CustomStreamWrapper:
         return any(get(field) for field in cls._CONTINUATION_DISQUALIFYING_DELTA_FIELDS)
 
     def _accumulate_streamed_delta(self, delta: object) -> None:
-        # Shared by the sync, async, and non-aiohttp iteration sites so answer
-        # text and the disqualifying-content latch stay in step across all three.
         get: Final = getattr(delta, "get", None)
         content: Final = get("content") if callable(get) else None
         self.response_uptil_now += content if isinstance(content, str) else ""
diff --git a/litellm/proxy/guardrails/guardrail_hooks/generic_guardrail_api/__init__.py b/litellm/proxy/guardrails/guardrail_hooks/generic_guardrail_api/__init__.py
index 242354ac417..60b72693fbf 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/generic_guardrail_api/__init__.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/generic_guardrail_api/__init__.py
@@ -32,7 +32,7 @@ def initialize_guardrail(litellm_params: "LitellmParams", guardrail: "Guardrail"
         additional_provider_specific_params=getattr(litellm_params, "additional_provider_specific_params", {}),
         unreachable_fallback=getattr(litellm_params, "unreachable_fallback", "fail_closed"),
         fail_on_error=getattr(litellm_params, "fail_on_error", True),
-        forward_messages_as_sent=getattr(litellm_params, "forward_messages_as_sent", False),
+        forward_messages_as_sent=litellm_params.forward_messages_as_sent,
         extra_headers=getattr(litellm_params, "extra_headers", None),
         guardrail_name=guardrail.get("guardrail_name", ""),
         event_hook=litellm_params.mode,

From b4488ef8920f011be7f6d3f3ee40397afec57cdc Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Sun, 18 Oct 2026 08:14:24 +0000
Subject: [PATCH 5/7] refactor: clean up fresh tech debt in kimi k3 token
 counting and two slop comments

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/anthropic_beta_headers_manager.py    | 1 -
 litellm/llms/bedrock/count_tokens/kimi_k3.py | 4 +---
 litellm/main.py                              | 1 -
 3 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/litellm/anthropic_beta_headers_manager.py b/litellm/anthropic_beta_headers_manager.py
index 96c38b69104..7fb3e76ff54 100644
--- a/litellm/anthropic_beta_headers_manager.py
+++ b/litellm/anthropic_beta_headers_manager.py
@@ -189,7 +189,6 @@ def _load_beta_headers_config() -> dict:
         if _BETA_HEADERS_CONFIG is not None:
             return _BETA_HEADERS_CONFIG
 
-        # Get the URL from environment or use default
         from litellm import anthropic_beta_headers_url
 
         _BETA_HEADERS_CONFIG = get_beta_headers_config(url=anthropic_beta_headers_url)
diff --git a/litellm/llms/bedrock/count_tokens/kimi_k3.py b/litellm/llms/bedrock/count_tokens/kimi_k3.py
index 5e3fd56e4ba..fdf986fa6fd 100644
--- a/litellm/llms/bedrock/count_tokens/kimi_k3.py
+++ b/litellm/llms/bedrock/count_tokens/kimi_k3.py
@@ -452,9 +452,7 @@ def _converse_request(
     if not all(_text_only(message) for message in messages):
         return None
     try:
-        chat_tools: Final = tuple(
-            chat_tool for tool in tools or () for chat_tool in _as_converse_input(tool)
-        )  # comprehension-ok: flattens each tool's translation
+        chat_tools: Final = tuple(chain.from_iterable(_as_converse_input(tool) for tool in tools or ()))
         return _ConverseRequest.model_validate(
             litellm.AmazonConverseConfig().transform_request(
                 model=model,
diff --git a/litellm/main.py b/litellm/main.py
index 38591441e01..2a4076138d1 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -5853,7 +5853,6 @@ def completion(
                 return resolve_timeout(stream_kind=StreamKind.NOT_STREAMED)
             return resolve_timeout(stream_kind=StreamKind.FAKED if fakes_stream(attempt_params) else StreamKind.LIVE)
 
-        ### TIMEOUT LOGIC ###
         timeout = timeout_for_optional_params(optional_params)
         logging.record_applied_timeout(timeout)
         processed_non_default_params: Final = pre_process_non_default_params(

From f54eb8987fd5f1a56aa754f960ab44646e06fd6f Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Tue, 20 Oct 2026 08:07:00 +0000
Subject: [PATCH 6/7] refactor: clean up fresh tech debt in mcp tool call auth
 fields, messages drop_params, exception chain and spend log noqa

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 .../pass_through/messages/transformation.py   |  2 +-
 .../mcp_server/mcp_server_manager.py          |  6 +++---
 .../db_transaction_queue/spend_log_cleanup.py |  6 +++---
 litellm/proxy/utils.py                        | 19 +++++++++++--------
 4 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/litellm/llms/anthropic/pass_through/messages/transformation.py b/litellm/llms/anthropic/pass_through/messages/transformation.py
index 0e8c1b49e8e..9aadd954423 100644
--- a/litellm/llms/anthropic/pass_through/messages/transformation.py
+++ b/litellm/llms/anthropic/pass_through/messages/transformation.py
@@ -694,7 +694,7 @@ class AnthropicMessagesConfig(BaseAnthropicMessagesConfig):
 
         anthropic_messages_request: Final[AnthropicMessagesRequest] = AnthropicMessagesRequest(
             messages=strip_encrypted_reasoning_blocks_from_anthropic_messages(
-                drop_non_string_tool_result_texts(messages, getattr(litellm_params, "drop_params", None))
+                drop_non_string_tool_result_texts(messages, litellm_params.drop_params)
             ),
             max_tokens=max_tokens,
             model=model,
diff --git a/litellm/proxy/_experimental/mcp_server/mcp_server_manager.py b/litellm/proxy/_experimental/mcp_server/mcp_server_manager.py
index f65310a77e3..a7f33f67e74 100644
--- a/litellm/proxy/_experimental/mcp_server/mcp_server_manager.py
+++ b/litellm/proxy/_experimental/mcp_server/mcp_server_manager.py
@@ -6145,9 +6145,9 @@ class MCPServerManager:
             "server_name": server_name,
             "mcp_rate_limit_server_name": server.alias or server.server_name or server.name,
             "user_api_key_auth": checked_auth,
-            "user_api_key_user_id": (getattr(checked_auth, "user_id", None) if checked_auth else None),
-            "user_api_key_team_id": (getattr(checked_auth, "team_id", None) if checked_auth else None),
-            "user_api_key_end_user_id": (getattr(checked_auth, "end_user_id", None) if checked_auth else None),
+            "user_api_key_user_id": checked_auth.user_id if checked_auth else None,
+            "user_api_key_team_id": checked_auth.team_id if checked_auth else None,
+            "user_api_key_end_user_id": checked_auth.end_user_id if checked_auth else None,
             "user_api_key_hash": (getattr(checked_auth, "api_key_hash", None) if checked_auth else None),
             "incoming_bearer_token": caller_bearer.get_secret_value() if caller_bearer is not None else None,
             "headers": logging_safe_mcp_headers(raw_headers),
diff --git a/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py b/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py
index b57952b4992..2a40913417e 100644
--- a/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py
+++ b/litellm/proxy/db/db_transaction_queue/spend_log_cleanup.py
@@ -467,7 +467,7 @@ class SpendLogCleanup:
                 rows: Final = _STORAGE_ROWS.validate_python(
                     await tx.query_raw(trusted_sql(_STORAGE_SQL), list(_SPEND_LOG_TABLES))
                 )
-        except Exception as e:  # noqa: BLE001 - a failed measurement skips the size pass, it must not fail the run
+        except Exception as e:  # noqa: BLE001  # a failed measurement skips the size pass, it must not fail the run
             verbose_proxy_logger.warning("Could not measure spend-log storage: %s: %s", type(e).__name__, e)
             return None
         if not rows:
@@ -493,7 +493,7 @@ class SpendLogCleanup:
                     await tx.query_raw(trusted_sql(_LOAD_SIZE_STATE_SQL), SPEND_LOG_SIZE_CLEANUP_STATE_PARAM)
                 )
             return SizeCleanupState.model_validate_json(rows[0].state_json) if rows else None
-        except Exception as e:  # noqa: BLE001 - an unreadable count restarts from the catalog, it must not fail the run
+        except Exception as e:  # noqa: BLE001  # an unreadable count restarts from the catalog, it must not fail the run
             verbose_proxy_logger.warning("Could not read the spend-log size cleanup state: %s: %s", type(e).__name__, e)
             return None
 
@@ -505,7 +505,7 @@ class SpendLogCleanup:
                 await tx.execute_raw(
                     trusted_sql(_SAVE_SIZE_STATE_SQL), SPEND_LOG_SIZE_CLEANUP_STATE_PARAM, state.model_dump_json()
                 )
-        except Exception as e:  # noqa: BLE001 - a lost save costs one re-seed from the catalog, it must not fail the run
+        except Exception as e:  # noqa: BLE001  # a lost save costs one re-seed from the catalog, it must not fail the run
             verbose_proxy_logger.warning("Could not save the spend-log size cleanup state: %s: %s", type(e).__name__, e)
 
     def _timeout_ms(self, deadline: float) -> int:
diff --git a/litellm/proxy/utils.py b/litellm/proxy/utils.py
index a8bd35644c9..8681ca2faae 100644
--- a/litellm/proxy/utils.py
+++ b/litellm/proxy/utils.py
@@ -27,7 +27,7 @@ from dataclasses import dataclass, field
 from datetime import date, datetime, timedelta, timezone
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
-from functools import partial
+from functools import partial, reduce
 from itertools import takewhile
 from operator import attrgetter
 from types import MappingProxyType
@@ -1226,14 +1226,17 @@ _LOG_DB_METRICS_CALL_TYPES: Final = frozenset(("get_data", "insert_data", "updat
 _EXCEPTION_CHAIN_MAX_DEPTH: Final = 16
 
 
+def _extended_exception_chain(chain: tuple[BaseException, ...], iteration: int) -> tuple[BaseException, ...]:
+    if len(chain) != iteration + 1:
+        return chain
+    following: Final = chain[-1].__cause__ or chain[-1].__context__
+    if following is None or following in chain:
+        return chain
+    return (*chain, following)
+
+
 def _exception_chain(exception: BaseException) -> tuple[BaseException, ...]:
-    chain: Final[list[BaseException]] = [exception]  # mutable-ok: built once, returned frozen
-    for _ in range(_EXCEPTION_CHAIN_MAX_DEPTH):
-        following = chain[-1].__cause__ or chain[-1].__context__
-        if following is None or following in chain:
-            break
-        chain.append(following)
-    return tuple(chain)
+    return reduce(_extended_exception_chain, range(_EXCEPTION_CHAIN_MAX_DEPTH), (exception,))
 
 
 def _timed_out_reading_from_provider(exception: Exception) -> bool:

From f736ac8891557cf85e72c579cabad8db35c61c45 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Tue, 20 Oct 2026 08:52:06 +0000
Subject: [PATCH 7/7] fix: preserve dict-compatible drop params access

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/llms/anthropic/pass_through/messages/transformation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/llms/anthropic/pass_through/messages/transformation.py b/litellm/llms/anthropic/pass_through/messages/transformation.py
index 9aadd954423..0e8c1b49e8e 100644
--- a/litellm/llms/anthropic/pass_through/messages/transformation.py
+++ b/litellm/llms/anthropic/pass_through/messages/transformation.py
@@ -694,7 +694,7 @@ class AnthropicMessagesConfig(BaseAnthropicMessagesConfig):
 
         anthropic_messages_request: Final[AnthropicMessagesRequest] = AnthropicMessagesRequest(
             messages=strip_encrypted_reasoning_blocks_from_anthropic_messages(
-                drop_non_string_tool_result_texts(messages, litellm_params.drop_params)
+                drop_non_string_tool_result_texts(messages, getattr(litellm_params, "drop_params", None))
             ),
             max_tokens=max_tokens,
             model=model,