fix for long input names in tool creation

Signed-off-by: Shoumi <[email protected]>

Author: shoummu1

mcpgateway/main.py

@@ -45,6 +45,7 @@
     WebSocket,
     WebSocketDisconnect,
 )
+from fastapi.exceptions import RequestValidationError
 from fastapi.background import BackgroundTasks
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse, RedirectResponse, StreamingResponse
@@ -290,6 +291,24 @@ async def validation_exception_handler(_request: Request, exc: ValidationError):
     return JSONResponse(status_code=422, content=ErrorFormatter.format_validation_error(exc))
 
 
+@app.exception_handler(RequestValidationError)
+async def request_validation_exception_handler(_request: Request, exc: RequestValidationError):
+    """Handle FastAPI request validation errors globally.
+
+    Intercepts RequestValidationError exceptions raised by FastAPI's automatic
+    request validation and returns a properly formatted JSON error response.
+    This ensures that user input is not reflected back in error messages.
+
+    Args:
+        _request: The FastAPI request object that triggered the validation error.
+        exc: The FastAPI RequestValidationError exception.
+
+    Returns:
+        JSONResponse: A 422 Unprocessable Entity response with sanitized error details.
+    """
+    return JSONResponse(status_code=422, content=ErrorFormatter.format_validation_error(exc))
+
+
 @app.exception_handler(IntegrityError)
 async def database_exception_handler(_request: Request, exc: IntegrityError):
     """Handle SQLAlchemy database integrity constraint violations globally.