Intervals.icu MCP Server

What is Intervals.icu MCP Server?

The Intervals.icu MCP Server is a Model Context Protocol (MCP) server that connects Claude and ChatGPT with the Intervals.icu API. It provides tools for authentication and data retrieval for activities, events, wellness data, power curves, and custom items.

How to use Intervals.icu MCP Server?

Install Python 3.12+, clone the repository, create a virtual environment with uv venv --python 3.12, sync dependencies with uv sync, then set API_KEY and ATHLETE_ID in a .env file. Configure Claude Desktop by adding the server to claude_desktop_config.json using the uv command, or start the server in SSE mode for ChatGPT using environment variables MCP_TRANSPORT=sse and FASTMCP_HOST/FASTMCP_PORT.

Key features of Intervals.icu MCP Server

• Retrieve and manage activities, events, and wellness data
• Access interval details, streams, and power curves
• Create, update, delete custom items (charts, fields, zones)
• Supports both stdio (Claude) and SSE (ChatGPT) transports

Use cases of Intervals.icu MCP Server

• Ask Claude about your past training sessions and performance
• Manage upcoming workouts, races, or notes via ChatGPT
• Automate wellness data logging and analysis
• Integrate custom items and power curve data into AI workflows

FAQ from Intervals.icu MCP Server

What are the runtime requirements?

Python 3.12 or higher, the MCP Python SDK, httpx, and python-dotenv. Use uv for package management.

How do I get my Intervals.icu API key and athlete ID?

Log in to Intervals.icu, go to Settings > API to generate a key. Your athlete ID is visible in the URL (e.g., https://intervals.icu/athlete/i12345/...).

Which transports are supported?

Stdio for Claude Desktop and SSE for ChatGPT’s beta MCP connectors. For SSE, set MCP_TRANSPORT=sse and expose the server (e.g., via ngrok).

Why does Claude Desktop give a spawn uv ENOENT error?

Claude cannot find the uv executable. Use the full path to uv (get it with which uv or where.exe uv) in the command field of claude_desktop_config.json.

Where does Claude Desktop store its config on Windows?

If installed from the Microsoft Store, the config is at AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\claude_desktop_config.json. Otherwise, it is in AppData\Roaming\Claude\.