diff --git a/opax-mcp/server.py b/opax-mcp/server.py
index 9c1fc61..da7c10a 100644
--- a/opax-mcp/server.py
+++ b/opax-mcp/server.py
@@ -636,7 +636,7 @@ async def mcp_handler(request: Request):
         tool_name, tool_args = params.get("name") or params.get("tool"), params.get("arguments", params.get("params", {}))
         entry = TOOLS.get(tool_name)
         if not entry: return JSONResponse(_jsonrpc_err(req_id, -32601, f"Unknown tool: {tool_name}"))
-        handler, _, _ = entry
+        handler = entry[0]
         try:
             handler_result = await handler(tool_args)