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MCP server · Developer Tools

Cal MCP

by · github.com/calcom/cal-mcp

the official MCP server for cal.com

Unclaimed last commit a year ago devtools
InstallView source
39Low

Scored 8 days ago · breakdown

About Cal MCP

Cal MCP is an MCP server published by calcom in the Developer Tools category: the official MCP server for cal.com.

The repository has 30 stars and 15 forks, with the last commit a year ago. Six months or more without a commit doesn't mean the server is broken, but check the open issues before depending on it in production.

Install

From source
git clone https://github.com/calcom/cal-mcp

This server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.

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Security checks

Static checks derived from the repository 6 days ago. Heuristics on the source, not an audit.

  • ✓README presentThe repository ships documentation.
  • !License declaredNo license file. Legally you have no right to use it in a product.
  • !Tests presentNo tests found. Behaviour changes may go unnoticed between versions.
  • ✓Dependencies pinnedA lockfile pins dependency versions.
  • ✓No dynamic code executionSource scan found no eval, dynamic Function, or shell execution.

1 check has not been run yet.

README

Cal.com MCP Server

⚠️ Warning: This project is in active development and subject to rapid changes. Features and APIs may be modified frequently. If you have feedback or workflows you'd like to see supported, please get in touch.

Model Context Protocol (MCP) is a standardized protocol for managing context between large language models (LLMs) and external systems or services like Cal.com.

Cal.com's MCP server allows you to use any MCP Client (Claude Desktop, Cursor, Windsurf and many others) to use natural language and your LLM to accomplish things with Cal.com.

Setup

Requirements

  • Node.js >= v18.0.0
  • MCP Client
  • Cal.com API Key - get this from your Cal.com account settings

⚠️ Security Warning: Never share or commit your Cal.com API Key. If exposed, immediately rotate it in your Cal.com account.

Installation

Installation will vary depending on your client, but in most cases you'll need to add the JSON below to your MCP config file. Be sure to insert your Cal.com API token.

{
  "mcpServers": {
    "cal": {
      "command": "npx",
      "args": [
        "@calcom/cal-mcp@latest"
      ],
      "env": {
        "CAL_API_KEY": "YOUR CAL API KEY"
      }
    }
  }
}

Features

This project supports tools for all Cal.com API endpoints by setting the --all-tools flags`. It also supports some prompt workflows tested in Cursor which allow you to quickstart Cal.com applications.

Supported Tools

By default, the following core Cal.com API tools are enabled:

  • getBooking
  • getBookings
  • createBooking
  • rescheduleBooking
  • cancelBooking
  • getEventTypes
  • getEventTypeById
  • updateEventType
  • deleteEventType

To access additional tools:

  1. Add the --all-tools or -a to args in your MCP configuration
  2. Run the MCP server
  3. Use your MCP client's tool discovery feature

README fetched from the repository 6 days ago. The original is authoritative.

Questions

About Cal MCP

How do I install Cal MCP?

No package has been published for this server, so install it from source: clone the repository and follow its README.

Is Cal MCP safe to use with an AI agent?

Its trust score is 39 out of 100 (low). It passes 3 of the 5 static security checks run so far; the failures are listed above. It has no ConduID identity yet, so agent calls to it are not receipted.

Is Cal MCP still maintained?

The last commit was a year ago and 9 open issues. That's long enough that you should check whether the maintainer is responding to issues before depending on it.