How to Create an MCP Server and Connect it to a Google ADK Agent

This guide demonstrates how to build an MCP (Model Context Protocol) server using FastMCP and integrate it with a Google ADK agent. The process involves creating tools, exposing them through the MCP server, and connecting them to enable the agent to interact with external services. Key steps include setting up FastMCP, defining callable tools, and configuring the Google ADK agent to communicate with the MCP server.

Key Points

• •FastMCP is a framework for quickly building MCP servers with minimal boilerplate
• •Tools must be explicitly exposed through the MCP server to be accessible to agents
• •Google ADK agents can connect to MCP servers to extend their capabilities beyond built-in functions
• •Tool definitions require clear descriptions and parameter schemas for agent understanding
• •MCP servers act as bridges between agents and external APIs or services
• •Configuration of the MCP server endpoint is necessary for agent-server communication
• •Testing tools locally before agent integration helps identify issues early
• •FastMCP simplifies the process of creating production-ready MCP servers

Workflow Diagram

Concepts