MFP Logger

Chat to log food into MyFitnessPal — from your phone (Claude / ChatGPT) via an always-on Railway server, or from your Mac terminal.

Say:

log 2 eggs and a banana for breakfast

…and it lands in your diary (meal + quantity + date).

MyFitnessPal diaries are meal-based (Breakfast / Lunch / Dinner / Snacks), not clock timestamps.

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Phone setup (Railway — recommended)

Your Mac does not need to stay on. Claude’s cloud calls your Railway URL.

1. Get an MFP session cookie

On any browser logged into myfitnesspal.com:

1. DevTools → Application → Cookies → www.myfitnesspal.com
2. Copy __Secure-next-auth.session-token (or the full Cookie header)

2. Create a Railway project

1. Push this repo to GitHub (or deploy from the Railway CLI).
2. railway.app → New Project → Deploy from GitHub (Dockerfile is detected).
3. Variables (Settings → Variables):

Variable	Value
MCP_AUTH_TOKEN	long random secret (python3 -c "import secrets; print(secrets.token_urlsafe(32))")
MFP_COOKIE	the session cookie from step 1
MFP_USERNAME	optional MFP username if needed

4. Service → Settings → Networking → Public Networking → Generate Domain
5. Wait until deploy is healthy (/healthz should return {"ok":true,...}).

3. Connect Claude (once on web)

Claude’s custom connector UI often only shows OAuth fields (no Bearer header). Use the secret path URL instead:

https://YOUR-APP.up.railway.app/t/YOUR_MCP_AUTH_TOKEN/mcp

1. Open claude.ai/customize/connectors (same account as iOS).
2. Add custom connector
3. Paste that full URL (token is in the path)
4. Leave OAuth Client ID and Client Secret empty
5. Add / Connect

4. Use Claude on iPhone

1. Open Claude iOS → chat → + → Connectors → enable this connector
2. Message: log 2 eggs and a banana for breakfast

ChatGPT mobile

Same path URL works. If ChatGPT asks for an API key, you can still paste MCP_AUTH_TOKEN, but the path URL alone is enough.

When the MFP cookie expires

Session cookies die every few weeks. On your phone:

1. Open https://YOUR-APP.up.railway.app/admin
2. Enter MCP_AUTH_TOKEN + a fresh cookie → Save
3. Also paste the same cookie into Railway Variables → MFP_COOKIE (so restarts keep it)

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Local Mac (optional)

uv sync
uv run mfp-logger auth          # save cookie locally
uv run mfp-logger chat          # needs OPENAI_API_KEY — terminal agent
uv run mfp-logger mcp           # local MCP for testing only

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MCP tools

Tool	Purpose
search_food	Search MFP database
log_food	Log food + quantity + meal + date
quick_add	Quick-add calories/macros
get_diary	Read diary for a day
get_goals	Daily goals
delete_food	Remove a mistaken entry

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Security

• Treat MCP_AUTH_TOKEN like a password. Anyone with
  https://…/t/<token>/mcp can write to your diary.
• Prefer not sharing that URL; rotate the token in Railway if it leaks.
• Never commit .env (contains MFP_COOKIE).