Add mcp router as a built-in tool

Author: songyichun123

veadk/tools/builtin_tools/mcp_router.py

@@ -0,0 +1,21 @@
+# Copyright (c) 2025 Beijing Volcano Engine Technology Co., Ltd. and/or its affiliates.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from google.adk.tools.mcp_tool.mcp_toolset import MCPToolset, SseConnectionParams
+
+from veadk.config import getenv
+
+url = getenv("TOOL_MCP_Router_URL")
+
+mcp_router = MCPToolset(connection_params=SseConnectionParams(url=url))