Calendly MCP Server

Calendly MCP Server

An MCP (Model Context Protocol) server that connects Claude Desktop and Claude Code to your Calendly account, enabling natural-language scheduling management.

Installation

pip install calendly-mcp

Getting a Calendly Personal Access Token

1. Log in to Calendly
2. Go to Settings > Integrations & Apps
3. Scroll to API & Connectors and click API
4. Click Get a token now (or Generate New Token)
5. Give the token a name (e.g., "Claude MCP") and click Create Token
6. Copy the token immediately -- it will not be shown again

Configuration

Claude Desktop

Add the following to your claude_desktop_config.json:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "calendly": {
      "command": "calendly-mcp",
      "env": {
        "CALENDLY_ACCESS_TOKEN": "your-token-here",
        "LICENSE_KEY": "optional-premium-key"
      }
    }
  }
}

Claude Code

Set the environment variable before starting Claude Code:

export CALENDLY_ACCESS_TOKEN="your-token-here"
export LICENSE_KEY="optional-premium-key"   # only if you have a premium license

Then add the MCP server:

claude mcp add calendly -- calendly-mcp

Or add it to your project's .mcp.json:

{
  "mcpServers": {
    "calendly": {
      "command": "calendly-mcp",
      "env": {
        "CALENDLY_ACCESS_TOKEN": "your-token-here"
      }
    }
  }
}

Environment Variables

Tools

Free Tier (7 tools)

Premium Tier (5 additional tools)

Free vs Premium

Upgrade at nyxtools.lemonsqueezy.com/checkout

Usage Examples

Once connected, talk to Claude naturally:

Viewing Your Schedule

• "What meetings do I have this week?"
• "Show me my schedule for tomorrow"
• "List my next 5 meetings"
• "What canceled meetings did I have this month?"

Event Details

• "Tell me more about my 3pm meeting"
• "Who's invited to the design review?"
• "What's the Zoom link for my next call?"

Searching Events

• "Do I have any meetings with john@example.com?"
• "Find all meetings with Sarah"
• "When did I last meet with the Acme team?"

Checking Availability

• "Am I free Thursday afternoon?"
• "What does my availability look like next week?"
• "What times am I busy tomorrow?"

Event Types

• "What event types do I have set up?"
• "Show me the details of my 30-minute meeting type"

Scheduling (Premium)

• "Schedule a 30-minute call with john@example.com for Tuesday at 2pm"
• "Set up a meeting with Jane Smith next Wednesday"

Canceling and Rescheduling (Premium)

• "Cancel my 3pm meeting tomorrow"
• "Cancel the call with John -- I have a conflict"
• "Move my 2pm meeting to Thursday at 4pm"
• "Reschedule the call with Sarah to next Monday morning"

Analytics (Premium)

• "How many meetings did I have this month?"
• "What's my average meeting length?"
• "How much time have I spent in meetings with John?"

Development

Setup

git clone https://github.com/nyxtools/calendly-mcp-server.git
cd calendly-mcp-server
python -m venv venv
source venv/bin/activate   # or venv\Scripts\activate on Windows
pip install -e ".[dev]"

Running Tests

pytest
pytest --cov=calendly_mcp    # with coverage

Linting

ruff check src/ tests/
ruff format src/ tests/
mypy src/

Troubleshooting

"CALENDLY_ACCESS_TOKEN is required"

You have not set the CALENDLY_ACCESS_TOKEN environment variable. Make sure it is configured in your claude_desktop_config.json (under env) or exported in your shell before running Claude Code.

401 Unauthorized errors

Your Calendly Personal Access Token is invalid or has been revoked. Generate a new token at Settings > Integrations & Apps > API in Calendly and update your configuration.

429 Rate limit errors

The Calendly API enforces rate limits. The MCP server automatically retries with exponential backoff, but if you see persistent rate limit errors, reduce the frequency of requests or wait a few minutes.

Connection errors

• Verify you have internet connectivity
• Check that api.calendly.com is reachable from your network
• If behind a proxy, ensure httpx can reach the Calendly API

Premium tools not appearing

• Verify your LICENSE_KEY is set correctly in the environment
• Check the server logs for license validation errors (LOG_LEVEL=DEBUG)
• Ensure your premium subscription is active at nyxtools.lemonsqueezy.com

Server not starting in Claude Desktop

• Verify the command path is correct (calendly-mcp must be on your PATH)
• Try running calendly-mcp directly in a terminal to check for errors
• On Windows, you may need to use the full path to the executable

License

MIT -- see LICENSE for details.

Copyright (c) 2026 NyxTools