add missing imports and remove redundant exception

Signed-off-by: Suresh Kumar Moharajan <suresh.kumar.m@ibm.com>

Author: Suresh Kumar Moharajan

mcpgateway/main.py

@@ -2364,20 +2364,6 @@ async def plugin_exception_handler(_request: Request, exc: PluginError):
     return ORJSONResponse(status_code=200, content={"error": json_rpc_error.model_dump()})
 
 
-@app.exception_handler(ContentSizeError)
-async def content_size_exception_handler(_request: Request, exc: ContentSizeError):
-    """Handle content size limit violations globally.
-
-    Args:
-        _request: The incoming request (unused, required by FastAPI handler interface).
-        exc: The ContentSizeError with actual_size, max_size, and content_type.
-
-    Returns:
-        ORJSONResponse: A 413 Payload Too Large response with structured error details.
-    """
-    return ORJSONResponse(status_code=413, content={"detail": {"error": f"{exc.content_type} size limit exceeded", "message": str(exc), "actual_size": exc.actual_size, "max_size": exc.max_size}})
-
-
 @app.exception_handler(ContentTypeError)
 async def content_type_exception_handler(_request: Request, exc: ContentTypeError):
     """Handle MIME type validation failures globally.

mcpgateway/services/content_security.py

@@ -29,11 +29,11 @@
     class NoOpCounter:
         """No-op counter for test environments where metrics are unavailable."""
 
-        def labels(self, **kwargs):
+        def labels(self, **_kwargs):
             """Return self to allow method chaining."""
             return self
 
-        def inc(self, amount=1):
+        def inc(self, _amount=1):
             """No-op increment method."""
 
     content_size_violations_counter = NoOpCounter()

mcpgateway/services/prompt_service.py

@@ -47,6 +47,7 @@
 from mcpgateway.plugins.framework import get_plugin_manager, GlobalContext, PluginContextTable, PluginManager, PromptHookType, PromptPosthookPayload, PromptPrehookPayload
 from mcpgateway.schemas import PromptCreate, PromptMetrics, PromptRead, PromptUpdate, TopPerformer
 from mcpgateway.services.audit_trail_service import get_audit_trail_service
+from mcpgateway.services.base_service import BaseService
 from mcpgateway.services.content_security import ContentSizeError, get_content_security_service
 from mcpgateway.services.event_service import EventService
 from mcpgateway.services.logging_service import LoggingService

mcpgateway/services/resource_service.py

@@ -60,6 +60,7 @@
 from mcpgateway.observability import create_span
 from mcpgateway.schemas import ResourceCreate, ResourceMetrics, ResourceRead, ResourceSubscription, ResourceUpdate, TopPerformer
 from mcpgateway.services.audit_trail_service import get_audit_trail_service
+from mcpgateway.services.base_service import BaseService
 from mcpgateway.services.content_security import ContentSizeError, ContentTypeError, get_content_security_service
 from mcpgateway.services.event_service import EventService
 from mcpgateway.services.logging_service import LoggingService