Summary
The formulas are named, which is the whole reason to use it.
Ask a model to predict a marathon time from a 10K and it will produce a plausible number. Here the answer comes from Riegel, the zones come from Karvonen, and the tool says so — so a runner can check the method rather than trust the arithmetic.
What it is
A running toolkit for agents. Four tools compute locally with no API call — pace, race prediction, heart-rate zones and a countdown — and six query RunDida's public library of calculators, training guides and marathon events.
What you get
- calculate_pace works out pace, finish time or distance from any two of the three
- predict_race applies the Riegel formula with VO2max estimation, from a known race result
- heart_rate_zones computes training zones by the Karvonen method from age and resting heart rate
- marathon_countdown returns the countdown to a specific event
- list_tools and get_tool browse the running calculators with their FAQs and sources
- list_guides and get_guide browse the training guides
- list_marathons and get_marathon cover events with dates, locations, course profile and race-day weather
- The compute tools run locally with no latency; the data tools fetch from the RunDida API with 30-minute caching
Requirements
The npm package @rundida/mcp-server, run with npx over stdio. Node.js 18 or newer. No API key and no account. The compute tools work without network access; the data tools need to reach rundida.com.
Setup effort
One command — claude mcp add rundida -- npx -y @rundida/mcp-server