fix: resolve ruff lint errors and mypy type error

- Remove unused import get_user_credential (F401)
- Add noqa: PLR0915 for 3 large functions exceeding 50 statements
- Cast result_data['q'] to str for _append_domain_filters (mypy arg-type)

Co-authored-by: Ishaan Jaff <ishaan-jaff@users.noreply.github.com>

litellm/a2a_protocol/main.py

@@ -439,7 +439,7 @@ def _build_streaming_logging_obj(
     return logging_obj
 
 
-async def asend_message_streaming(
+async def asend_message_streaming(  # noqa: PLR0915
     a2a_client: Optional["A2AClientType"] = None,
     request: Optional["SendStreamingMessageRequest"] = None,
     api_base: Optional[str] = None,

litellm/llms/searchapi/search/transformation.py

@@ -159,7 +159,7 @@ class SearchAPIConfig(BaseSearchConfig):
             domains = optional_params["search_domain_filter"]
             if isinstance(domains, list) and len(domains) > 0:
                 result_data["q"] = self._append_domain_filters(
-                    result_data["q"], domains
+                    str(result_data["q"]), domains
                 )
 
         if "country" in optional_params:

litellm/proxy/_experimental/mcp_server/server.py

@@ -1644,7 +1644,7 @@ if MCP_AVAILABLE:
                 },
             )
 
-    async def execute_mcp_tool(
+    async def execute_mcp_tool(  # noqa: PLR0915
         name: str,
         arguments: Dict[str, Any],
         allowed_mcp_servers: List[MCPServer],

litellm/proxy/agent_endpoints/a2a_endpoints.py

@@ -269,7 +269,7 @@ async def get_agent_card(
     tags=["[beta] A2A Agents"],
     dependencies=[Depends(user_api_key_auth)],
 )
-async def invoke_agent_a2a(
+async def invoke_agent_a2a(  # noqa: PLR0915
     agent_id: str,
     request: Request,
     fastapi_response: Response,

litellm/proxy/management_endpoints/mcp_management_endpoints.py

@@ -81,7 +81,6 @@ if MCP_AVAILABLE:
         delete_user_credential,
         get_all_mcp_servers_for_user,
         get_mcp_server,
-        get_user_credential,
         store_user_credential,
         update_mcp_server,
     )