仅保留mcp2.x行为

main/xiaozhi-server/core/providers/tools/server_mcp/mcp_client.py

@@ -107,7 +107,7 @@ class ServerMCPClient:
                 "function": {
                     "name": name,
                     "description": tool.description,
-                    "parameters": getattr(tool, "input_schema", None) or getattr(tool, "inputSchema", {}),
+                    "parameters": tool.input_schema,
                 },
             }
             for name, tool in self.tools_dict.items()