calcom-mcp

# Cal.com FastMCP Server > ⚠️ **Disclaimer**: This project is not affiliated with or endorsed by Cal.com. I am an independent developer and have no association with Cal.com in any official capacity. This project provides a FastMCP server for interacting with the Cal.com API. It allows Language Learning Models (LLMs) to use tools to connect with important Cal.com functionalities like managing event types and bookings. ## Prerequisites - Python 3.8+ - A Cal.com account and API Key (v2) ## Setup 1. **Clone the repository (if applicable) or download the files.** ```bash git clone https://github.com/Danielpeter-99/calcom-mcp.git cd calcom-mcp ``` 2. **Create a virtual environment (recommended):** ```bash python -m venv venv source venv/bin/activate # On Windows: venv\Scripts\activate ``` 3. **Install dependencies:** ```bash pip install -r requirements.txt ``` 4. **Set up the Cal.com API Key:** You need to set the `CALCOM_API_KEY` environment variable. You can get your API key from your Cal.com settings page (usually under Developer or Security settings). - **Linux/macOS:** ```bash export CALCOM_API_KEY="your_actual_api_key_here" ``` To make it permanent, add this line to your shell configuration file (e.g., `.bashrc`, `.zshrc`). - **Windows (PowerShell):** ```powershell $env:CALCOM_API_KEY="your_actual_api_key_here" ``` To make it permanent, you can set it through the System Properties > Environment Variables. ## Running the Server Once the setup is complete, you can run the FastMCP server: ```bash fastmcp run app.py --transport sse --port 8010 ``` The server will start at localhost:8010, and you should see output indicating it's running. If the `CALCOM_API_KEY` is not set, a warning will be displayed. ## Available Tools The server currently provides the following tools for LLM interaction: - `get_api_status()`: Check if the Cal.com API key is configured in the environment. Returns a string indicating the status. - `list_event_types()`: Fetch a list of all event types from Cal.com for the authenticated account. Returns a dictionary with the list of event types or an error message. - `get_bookings(...)`: Fetch a list of bookings from Cal.com, with optional filters (event_type_id, user_id, status, date_from, date_to, limit). Returns a dictionary with the list of bookings or an error message. - `create_booking(...)`: Create a new booking in Cal.com for a specific event type and attendee. Requires parameters like start_time, attendee details, and event type identifiers. Returns a dictionary with booking details or an error message. - `list_schedules(...)`: List all schedules available to the authenticated user or for a specific user/team. Optional filters: user_id, team_id, limit. Returns a dictionary with the list of schedules or an error message. - `list_teams(...)`: List all teams available to the authenticated user. Optional filter: limit. Returns a dictionary with the list of teams or an error message. - `list_users(...)`: List all users available to the authenticated account. Optional filter: limit. Returns a dictionary with the list of users or an error message. - `list_webhooks(...)`: List all webhooks configured for the authenticated account. Optional filter: limit. Returns a dictionary with the list of webhooks or an error message. **Note:** All tools require the `CALCOM_API_KEY` environment variable to be set. If it is not set, tools will return a structured error message. ## Tool Usage and Error Handling - All tools return either the API response (as a dictionary or string) or a structured error message with details about the failure. - Error messages include the type of error, HTTP status code (if applicable), and the response text from the Cal.com API. - For best results, always check for the presence of an `error` key in the response before using the returned data. - Tools are designed to be robust and provide informative feedback for both successful and failed API calls. ## Development Notes - The Cal.com API base URL is set to `https://api.cal.com/v2`. - Authentication is primarily handled using a Bearer token with the `CALCOM_API_KEY`. - The `create_booking` tool uses the `cal-api-version: 2024-08-13` header as specified in the Cal.com API v2 documentation for that endpoint. - Error handling is included in the API calls to provide informative responses. ## 🚀 Built With [](https://www.python.org/) [](https://github.com/jlowin/fastmcp) [](https://cal.com/docs/api-reference/v2/introduction) ## Important Security Note **Never hardcode your `CALCOM_API_KEY` directly into the source code.** Always use environment variables as described in the setup instructions to keep your API key secure.