Marathon Plan Keeper

Live

Build a 16 week marathon plan and keep it on track.

musemuse-marathon-plan-keeper.vercel.appOpen

Get it

Connect it to any app that speaks MCP. It has 2 tools: create_training_plan, update_training_plan. No sign-in.

Muse app: add this URL as a custom connector.
Claude Code: claude mcp add --transport http marathon-plan-keeper https://muse-muse.vercel.app/api/mcp/marathon-plan-keeper
Anything else: add it as a remote server over streamable HTTP.

What was checked

Checked by code

Each line is what the check ran on, and no more.

Passed Typecheck · Oct 28, 2026
Passed Build · Oct 28, 2026
Passed The built app starts · Oct 28, 2026
Passed No errors in the browser console · Oct 28, 2026
Passed Smoke test of the main flow · Oct 28, 2026
Passed Its manifest is valid · Oct 28, 2026

Judged by a model

This is a model's opinion, not proof.

Passed A model's opinion of the screenshots, against the brief · Oct 28, 2026

Not checked

Nothing here should be taken as tested.

Not checked Whether its answers are true
Not checked ChatGPT: only a person with an account can test it
Not checked Installing the Claude plugin or the Muse gadget pack on a real device
Not checked No Prove it run: nothing it comes with was run for real

The muse

Rebuild of Meta's videoPlan a long multi-step project, like a 16-week marathon plan, and keep it updat… (opens in a new tab)

Rebuild of Meta developer video First muse-wonder-1.0 demo: long multi-step 16 week marathon planning and updating, rebuilt clean on current models with its own design.

Took from it

Planning a long multi-step project like a 16 week marathon plan
Keeping the plan updated from progress over time

Left out

Video footage
Video script
Meta and Llama names and logos

Models

Muse WonderCreate and revise a coherent 16 week marathon plan across base, build, peak and taper phases, and update future weeks from weekly check-ins.

Cost per run: $0.10 est.
Runs so far: 45 calls · 313.5k tokens · $4.97
Build cost: $3.19 est.

Limits

Rebuild fit: clean. This web app rebuilds the same marathon planning demo on current models without the original video footage or script.
General training information only, not medical advice. Stops and asks the user to rest or see a clinician for pain or injury signs.
No wearable, map or calendar sync. Progress is typed in by hand.
Plans and logs save only in this browser localStorage.
Long outputs can vary week to week and need user review.

Muse app connector

Add it in the Muse app as a custom connector. It exposes 2 actions: create_training_plan, update_training_plan.

Recorded demo

How it was built

Muse Code made 57 tool calls and 16 edits across 16 files (+310 −16).
npm run verify passed after 1 fix round.
Screenshot judge: pass. Final screen shows 16 week timeline with phases, long runs and focus plus Week 1 day by day workouts.
Built in 20 min for about $3.19 in model calls (est.).
How it was built: 80 tool calls, 25 edits touching 25 files { <read-skill-result name="meta-reasoning" status="ok"> <read-skill-result name="product-ui" status="ok"> <read-skill-result name="verify" status="ok"> { {"items":4,"ok":true,"revision":1} Edited `lib/marathon.ts` { Edited `app/api/actions/create_marathon_plan/route.ts` <read-skill-result name="bundled:taste" status="ok"> Edited `app/api/actions/update_marathon_plan/route.ts` {"items":4,"ok":true,"revision":2} Edited `app/page.tsx` Read text file `app/layout.tsx`. Edited `app/layout.tsx` {"items":4,"ok":true,"revision":3} Edited `musemuse.json` Edited `tests/smoke.spec.ts` Edited `tests/actions.spec.ts`