Cal.com Calendar MCP server

The Cal.com Calendar MCP Server provides appointment scheduling capabilities through the Cal.com Calendar API, allowing you to add, update, delete, and list calendar appointments programmatically.

Installation and Configuration

Getting an API Key

Before using the MCP server, you'll need a Cal.com API key:

1. Sign up for a Cal.com account
2. Navigate to Settings > Developer > API Keys
3. Generate a new API key with appropriate permissions

Installation Options

You can run the Cal.com Calendar MCP server using either Docker or NPX.

Using Docker

Add the following configuration to your claude_desktop_config.json:

{
  "mcpServers": {
    "calcom-calendar": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "CALCOM_API_KEY",
        "mcp/calcom-calendar"
      ],
      "env": {
        "CALCOM_API_KEY": "YOUR_API_KEY_HERE"
      }
    }
  }
}

To build the Docker image:

docker build -t mcp/calcom-calendar:latest -f Dockerfile .

Using NPX

Alternatively, add this configuration to your claude_desktop_config.json to use NPX:

{
  "mcpServers": {
    "calcom-calendar": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-calcom-calendar"
      ],
      "env": {
        "CALCOM_API_KEY": "YOUR_API_KEY_HERE"
      }
    }
  }
}

Using the MCP Server

The Cal.com Calendar MCP server provides four main tools:

Adding Appointments

Use calcom_add_appointment to schedule new calendar appointments:

Required inputs:

• eventTypeId (number): The Cal.com event type ID
• startTime (string): Start time in ISO format (YYYY-MM-DDTHH:mm:ss.sssZ)
• endTime (string): End time in ISO format (YYYY-MM-DDTHH:mm:ss.sssZ)
• name (string): Attendee's name
• email (string): Attendee's email
• notes (string, optional): Additional notes for the appointment

Updating Appointments

Use calcom_update_appointment to modify existing appointments:

Required inputs:

• bookingId (number): The Cal.com booking ID to update

Optional inputs:

• startTime (string): New start time in ISO format
• endTime (string): New end time in ISO format
• notes (string): New notes for the appointment

Deleting Appointments

Use calcom_delete_appointment to cancel and remove appointments:

Required inputs:

• bookingId (number): The Cal.com booking ID to delete

Optional inputs:

• reason (string): Reason for cancellation

Listing Appointments

Use calcom_list_appointments to view scheduled appointments:

Required inputs:

• startDate (string): Start date in YYYY-MM-DD format
• endDate (string): End date in YYYY-MM-DD format

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.