Filesystem MCP Server

npx -y @modelcontextprotocol/server-filesystem /path/to/dir

{
  "mcpServers": {
    "filesystem-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/path/to/dir"
      ]
    }
  }
}

One of the reference implementations kept alongside the protocol itself. It exposes a whitelist of directories — the model can list, read, write and move files inside them and nowhere else, which makes it the usual first server people connect and the clearest example of how access scoping should look.