cai/examples/mcp/filesystem_example/README.md

MCP Filesystem Example

This example uses the filesystem MCP server, running locally via npx.

Run it via:

uv run python examples/mcp/filesystem_example/main.py

Details

The example uses the MCPServerStdio class from agents.mcp, with the command:

npx -y "@modelcontextprotocol/server-filesystem" <samples_directory>

It's only given access to the sample_files directory adjacent to the example, which contains some sample data.

Under the hood:

1. The server is spun up in a subprocess, and exposes a bunch of tools like list_directory(), read_file(), etc.
2. We add the server instance to the Agent via mcp_servers=[...].
3. Each time the agent runs, we call out to the MCP server to fetch the list of tools via server.list_tools(). The result can be cached when configured.
4. If the LLM chooses to use an MCP tool, the runtime calls the server via server.call_tool().