MCP Servers

intervals.mcp

Enables AI assistants to access and analyze intervals.icu training data including activities, fitness metrics (CTL/ATL/TSB), wellness stats, and calendar events. Supports natural language querying of athletic performance for training insights and workout planning.

README

intervals.mcp

An MCP server for intervals.icu, exposing your training data to Claude and other MCP clients. And yes, I did vibe code this.

I am not yet sure of the value of this MCP or AI for training in general. My recent months have been focused on skiing with minimal running. I asked it to help me ease back in to trail running and it came up with a pretty aggressive mileage plan and some heavier threshold work than I am doing now. I'll keep experimenting with it and adding tools as I see fit.

Prerequisites

Python 3.14+
uv
An intervals.icu account with API access

Configuration

Set the following environment variables:

Variable	Description
`INTERVALS_ATHLETE_ID`	Your athlete ID (found in the intervals.icu URL, e.g. `i12345`)
`INTERVALS_API_KEY`	Your API key (Settings → API)

Claude Code Setup

Add to your MCP config (.claude/settings.json or ~/.claude/settings.json):

{
  "mcpServers": {
    "intervals": {
      "command": "env",
      "args": [
        "INTERVALS_ATHLETE_ID=i12345",
        "INTERVALS_API_KEY=your-api-key",
        "uvx", "--from", "/path/to/intervals.mcp", "intervals-mcp"
      ]
    }
  }
}

Claude Desktop Setup

Open the config via Settings → Developer → Edit Config:

{
  "mcpServers": {
    "intervals": {
      "command": "env",
      "args": [
        "INTERVALS_ATHLETE_ID=i12345",
        "INTERVALS_API_KEY=your-api-key",
        "uvx", "--from", "/path/to/intervals.mcp", "intervals-mcp"
      ]
    }
  }
}

Available Tools

Tool	Description
`get_athlete`	Athlete profile including sport zones and thresholds
`get_activities`	List activities, filterable by date range and sport type
`get_activity_detail`	Full detail for a single activity including laps and intervals
`get_fitness`	CTL/ATL/TSB fitness time series
`get_wellness`	HRV, resting HR, sleep, and fatigue scores
`get_events`	Planned workouts and races from your calendar

Development

uv run intervals-mcp

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