MCP Servers

Cal.com MCP Server

Exposes Cal.com scheduling tools to AI agents via MCP, enabling listing event types, checking availability, and managing bookings (create, cancel, reschedule).

README

Cal.com MCP Server

Exposes Cal.com scheduling tools to AI agents via the Model Context Protocol (MCP).

Tools Available

Tool	Description
`list_event_types`	List all available event types (meeting types)
`get_availability`	Get free/busy slots for a date range
`create_booking`	Create a new booking/appointment
`cancel_booking`	Cancel an existing booking
`reschedule_booking`	Move a booking to a new time slot
`list_bookings`	List bookings with status filters

Setup

1. Configure environment

cp .env.example .env
# Edit .env and set your CAL_API_KEY

2. Install dependencies

npm install

3. Run tests

npm test

4. Start the server

npm start
# Server will run at http://localhost:3000

Transport Options

Streamable HTTP (recommended for production)

POST http://localhost:3000/mcp
GET  http://localhost:3000/mcp

SSE (Server-Sent Events)

GET  http://localhost:3000/sse          # Open SSE stream
POST http://localhost:3000/sse-messages # Send messages

stdio (local testing)

TRANSPORT=stdio npm start

Connecting to Claude

Add to your MCP client config:

{
  "mcpServers": {
    "calcom": {
      "url": "http://localhost:3000/mcp",
      "transport": "streamable-http"
    }
  }
}

API Endpoints

GET /health — Health check
GET / — Server manifest (lists tools and capabilities)
POST /mcp — MCP Streamable HTTP endpoint
GET /sse — SSE connection
POST /sse-messages — SSE message endpoint

Environment Variables

Variable	Description	Default
`CAL_API_KEY`	Cal.com API key (required)	—
`CAL_API_BASE`	Cal.com API base URL	`https://api.cal.com/v1`
`PORT`	HTTP server port	`3000`
`TRANSPORT`	`http` or `stdio`	`http`
`LOG_LEVEL`	`debug`, `info`, `warn`, `error`	`info`

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