fix: prevent exception information exposure in MCP server

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: root

src/mcp_server/main.py

@@ -80,7 +80,7 @@ async def ingest_repository(
 
     except Exception as e:
         logger.error(f"Error during ingestion: {e}", exc_info=True)
-        return f"Error ingesting repository: {e!s}"
+        return "Error ingesting repository: An internal error occurred"
 
 
 async def start_mcp_server_tcp(host: str = "0.0.0.0", port: int = 8001):
@@ -181,13 +181,14 @@ async def handle_message(message: dict):
                             },
                         )
                     except Exception as e:
+                        logger.error(f"Tool execution failed: {e}", exc_info=True)
                         return JSONResponse(
                             {
                                 "jsonrpc": "2.0",
                                 "id": message.get("id"),
                                 "error": {
                                     "code": -32603,
-                                    "message": f"Tool execution failed: {e!s}",
+                                    "message": "Tool execution failed",
                                 },
                             },
                         )
@@ -224,7 +225,7 @@ async def handle_message(message: dict):
                     "id": message.get("id") if "message" in locals() else None,
                     "error": {
                         "code": -32603,
-                        "message": f"Internal error: {e!s}",
+                        "message": "Internal server error",
                     },
                 },
             )