style(bedrock/claude_platform): fix ruff format + add coverage test

Run ruff format on common_utils.py. Add test for the invalid-type
fallback branch in resolve_unsupported_override (line 95 coverage).

litellm/llms/bedrock/claude_platform/common_utils.py

@@ -3,15 +3,14 @@ from typing import Literal, Optional, Protocol, Tuple
 import litellm
 from litellm._logging import verbose_logger
 from litellm.llms.bedrock.base_aws_llm import BaseAWSLLM
+from litellm.secret_managers.main import get_secret_str
 
 
 class _SupportsGet(Protocol):
     def get(self, key: str, default: object = None) -> object: ...
-from litellm.secret_managers.main import get_secret_str
 
-CLAUDE_PLATFORM_SERVICE_NAME: Literal["aws-external-anthropic"] = (
-    "aws-external-anthropic"
-)
+
+CLAUDE_PLATFORM_SERVICE_NAME: Literal["aws-external-anthropic"] = "aws-external-anthropic"
 CLAUDE_PLATFORM_BEDROCK_ROUTE = "claude_platform/"
 
 # Auth/routing params consumed by validate_environment / sign_request that
@@ -56,9 +55,7 @@ def filter_claude_platform_request_body(
     Filters a copy so callers' ``sign_request`` still sees ``aws_region_name``.
     """
     unsupported = (
-        unsupported_override
-        if unsupported_override is not None
-        else CLAUDE_PLATFORM_ON_AWS_UNSUPPORTED_REQUEST_PARAMS
+        unsupported_override if unsupported_override is not None else CLAUDE_PLATFORM_ON_AWS_UNSUPPORTED_REQUEST_PARAMS
     )
     dropped_unsupported = [k for k in params if k in unsupported]
     if dropped_unsupported:
@@ -72,9 +69,7 @@ def filter_claude_platform_request_body(
     return {
         k: v
         for k, v in params.items()
-        if k not in CLAUDE_PLATFORM_ON_AWS_NON_REQUEST_PARAMS
-        and k not in unsupported
-        and not k.startswith("aws_")
+        if k not in CLAUDE_PLATFORM_ON_AWS_NON_REQUEST_PARAMS and k not in unsupported and not k.startswith("aws_")
     }
 
 
@@ -113,14 +108,10 @@ class BedrockClaudePlatformMixin(BaseAWSLLM):
             or litellm_params.get("anthropic-workspace-id")
         )
         if workspace_id is None:
-            workspace_id = optional_params.get(
-                "anthropic_workspace_id"
-            ) or litellm_params.get("anthropic_workspace_id")
+            workspace_id = optional_params.get("anthropic_workspace_id") or litellm_params.get("anthropic_workspace_id")
         if workspace_id is not None:
             return str(workspace_id)
-        return get_secret_str("ANTHROPIC_AWS_WORKSPACE_ID") or get_secret_str(
-            "ANTHROPIC_WORKSPACE_ID"
-        )
+        return get_secret_str("ANTHROPIC_AWS_WORKSPACE_ID") or get_secret_str("ANTHROPIC_WORKSPACE_ID")
 
     def _get_required_aws_region_name(self, optional_params: dict) -> str:
         aws_region_name = (
@@ -158,9 +149,7 @@ class BedrockClaudePlatformMixin(BaseAWSLLM):
         )
         if api_base is None:
             aws_region_name = self._get_required_aws_region_name(optional_params)
-            api_base = (
-                f"https://{CLAUDE_PLATFORM_SERVICE_NAME}.{aws_region_name}.api.aws"
-            )
+            api_base = f"https://{CLAUDE_PLATFORM_SERVICE_NAME}.{aws_region_name}.api.aws"
         if not api_base.endswith("/v1/messages"):
             api_base = f"{api_base.rstrip('/')}/v1/messages"
         return api_base

tests/test_litellm/llms/bedrock/test_claude_platform_provider.py

@@ -480,6 +480,31 @@ def test_claude_platform_unsupported_override_allows_context_management():
     assert "context_management" in request_body
 
 
+def test_claude_platform_unsupported_override_ignores_invalid_type():
+    """
+    If claude_platform_unsupported_params is set to a non-collection type
+    (e.g. a string), the override is ignored and defaults apply.
+    """
+    from litellm.llms.bedrock.claude_platform.transformation import (
+        BedrockClaudePlatformConfig,
+    )
+
+    config = BedrockClaudePlatformConfig()
+    request_body = config.transform_request(
+        model="claude-sonnet-4-6",
+        messages=[{"role": "user", "content": "hello"}],
+        optional_params={
+            "context_management": {"edits": [{"type": "clear_tool_uses_20250919"}]},
+            "max_tokens": 10,
+        },
+        litellm_params={"claude_platform_unsupported_params": "not_a_list"},
+        headers={},
+    )
+
+    assert "context_management" not in request_body
+    assert request_body["max_tokens"] == 10
+
+
 def test_chat_completion_claude_platform_sigv4_body_has_no_auth_params():
     """
     End-to-end (mocked transport): a config-driven SigV4 call with