Command
nylas mcp serve
The nylas mcp serve command starts a Model Context Protocol server that exposes Nylas email, calendar, and contacts as tools for AI assistants. Choose --transport stdio for direct piping to Claude Code, Cursor, or VS Code, or --transport sse for network-based connections. The server registers tools like send_email, list_events, and search_contacts that AI agents can call.
Usage
nylas mcp serve [--transport stdio|sse] [--port PORT]Flags
| Flag | Description |
|---|---|
| --json | Output as JSON |
| --no-color | Disable color output |
| --verbose(-v) | Enable verbose output |
| --config | Custom config file path |
| --help(-h) | Show help for the command |
| --limit | Limit results (most list commands) |
| --yes(-y) | Skip confirmations |
| --port | Port for SSE transport (default: 3100) |
| --transport | Transport mode: stdio or sse (default: stdio) |
Examples
Start in stdio mode for Claude Code
nylas mcp serve --transport stdioStart SSE server on a custom port
nylas mcp serve --transport sse --port 3200Troubleshooting
MCP server exits immediately
Run nylas auth config and nylas auth login first. The MCP server needs valid credentials to register tools.
AI assistant can't connect to SSE server
Verify the port is not blocked by a firewall. Check that the assistant's MCP config points to http://localhost:PORT/sse.
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Run nylas mcp serve --help for full help output.