Intervals.icu MCP Server

A Model Context Protocol (MCP) server for Intervals.icu integration. Access your training data, wellness metrics, and performance analysis through Claude, ChatGPT, and other LLMs.

Originally based on eddmann/intervals-icu-mcp (MIT licensed). This project is an independent continuation with significant bug fixes and new features — see CHANGELOG.md for details.

Overview

62 tools spanning activities, activity analysis, activity messages, athlete profile, wellness, events/calendar, performance curves, workout library, gear, sport settings, and custom items — plus 4 MCP Resources (athlete profile, workout syntax, event categories, custom item schemas) and 7 MCP Prompts (training analysis, recovery check, weekly planning, and more). See Available Tools for the per-category breakdown.

Quick Start

Or for Claude Desktop, in 30 seconds:

1. Get your API key and athlete ID
2. Add this to your Claude Desktop config:

{
  "mcpServers": {
    "intervals-icu": {
      "command": "uvx",
      "args": ["intervals-icu-mcp"],
      "env": {
        "INTERVALS_ICU_API_KEY": "your-api-key-here",
        "INTERVALS_ICU_ATHLETE_ID": "i123456"
      }
    }
  }
}

3. Restart Claude and ask “Show me my activities from the last 7 days.”

Prefer Claude Code, Cursor, or ChatGPT? See Client Configuration. Want to run from source or with Docker? See Installation & Setup.

Prerequisites

Install uv — it handles Python, dependencies, and execution in one tool. brew install uv on macOS/Linux, or powershell -c "irm https://astral.sh/uv/install.ps1 | iex" on Windows. From there, uvx fetches Python and the package automatically. Docker is also supported as an alternative.

Intervals.icu API Key Setup

Before installation, obtain your Intervals.icu API key:

1. Go to https://intervals.icu/settings → Developer → Create API Key.
2. Copy the key, and note your Athlete ID from your profile URL (format: i123456).

Installation & Setup

Nothing to install separately if you use the recommended setup. uvx (which ships with uv) automatically downloads and caches the intervals-icu-mcp package the first time your MCP client launches it — just paste the config snippet from Client Configuration into your client and you’re done.

Client Configuration

The server speaks MCP over stdio and works with any compliant client. Click a client to expand. If you followed Quick Start (uvx), use the first config block; if you used the source or Docker alternative above, use the matching variant inside the same collapsible.

Usage

Ask Claude to interact with your Intervals.icu data in natural language. A few starter prompts:

"Show me my activities from the last 30 days"
"Am I overtraining? Check my CTL, ATL, and TSB"
"How's my recovery this week? Show HRV and sleep trends"
"Create a sweet spot cycling workout for tomorrow"
"What's my 20-minute power and FTP?"

For the full catalogue of example prompts by category, see docs/examples.md.

Available Tools

62 tools, 4 resources, and 7 prompt templates. One-line summary below — full reference in docs/tools.md.

Delete Safety Mode

Destructive tools are gated by the optional INTERVALS_ICU_DELETE_MODE env var (safe / full / none, default safe) — a server-side gate outside the model’s reach, so unregistered tools can’t be invoked. See docs/tools.md for the full mode table, response envelope, and TZ-buffer rationale.

Remote Deployment (HTTP / SSE)

The server runs over stdio by default — the right transport for local clients like Claude Desktop, Claude Code, and Cursor. HTTP and SSE transports are available for remote or hosted use.

⚠️ MCP has no built-in authentication — never expose an HTTP-mode server to an untrusted network without a tunnel (Tailscale, Cloudflare Tunnel) or an authenticating reverse proxy.

See docs/remote-deployment.md for transport flags and the full security model.

Documentation

• Example prompts — full catalogue of natural-language prompts by category
• Tool reference — complete tool, resource, and prompt inventory
• Architecture overview — how the server, middleware, client, and tools fit together
• Remote deployment (HTTP/SSE) — transports, flags, and the security model for hosted/remote setups
• Testing guide — conventions for pytest + respx, fixtures, and running the suite
• Changelog — release history
• Adding a new tool — step-by-step workflow for contributors

Contributing

Issues and pull requests are welcome. Before opening a PR, run make can-release locally to match what CI enforces (ruff, pyright, pytest). For new tools, follow the pattern in .claude/skills/add-tool/SKILL.md and add a respx-mocked test file alongside the implementation.

License

MIT License - see the LICENSE file for details.

Disclaimer

This project is not affiliated with, endorsed by, or sponsored by Intervals.icu. All product names, logos, and brands are property of their respective owners.