Calorie Tracker MCP Server

MCP server for tracking daily calorie intake with accurate BMR/TDEE calculations. Built on Cloudflare Workers with D1 database.

Features

• Food Tracking: Add, update, delete food entries with macros

• Profile Management: BMR/TDEE calculations using Mifflin-St Jeor equation

• Historical Data: Track weight, body composition over time

• Secure: OAuth 2.1 authentication with PKCE support

Quick Setup

pnpm install

# Create resources and update wrangler.jsonc with IDs
npx wrangler d1 create calorie-tracker
npx wrangler kv:namespace create OAUTH_KV

# Run migrations and start dev server
npx wrangler d1 migrations apply calorie-tracker --local
pnpm run dev

OAuth Client Registration

Set an admin API key:

# Development: Update wrangler.jsonc vars.ADMIN_API_KEY
# Production: Use secrets
npx wrangler secret put ADMIN_API_KEY

Register an OAuth client to obtain credentials:

curl -X POST http://localhost:8787/oauth/register \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_ADMIN_API_KEY" \
  -d '{
    "client_name": "Claude Desktop",
    "redirect_uris": ["http://127.0.0.1/callback", "http://localhost/callback"],
    "user_id": "admin"
  }'

Note: Claude Desktop will specify its callback URL during the OAuth flow. If you get a redirect URI mismatch error, check Claude Desktop's OAuth logs for the actual callback URL it expects.

Response:

{
  "client_id": "uuid-client-id",
  "client_secret": "generated-secret",
  "client_name": "Claude Desktop"
}

Claude Configuration

Option 1: Bearer Token (Personal/Pro/Max)

Simple authentication using client secret as bearer token:

1. Register OAuth client:

   curl -X POST http://localhost:8787/oauth/register \
     -H "Content-Type: application/json" \
     -H "X-API-Key: YOUR_ADMIN_API_KEY" \
     -d '{
       "client_name": "Claude Desktop",
       "redirect_uris": ["https://claude.ai/api/mcp/auth_callback"],
       "user_id": "admin"
     }'

   Save the client_secret from response.

2. Claude Desktop config (claude_desktop_config.json):

   {
     "mcpServers": {
       "calorie-tracker": {
         "command": "npx",
         "args": ["mcp-remote", "http://localhost:8787/sse"],
         "env": {
           "BEARER_TOKEN": "<client_secret from registration>"
         }
       }
     }
   }

Option 2: OAuth with Client Credentials (Team/Enterprise Only)

Private connector with Client ID/Secret:

1. Register OAuth client with callback URL https://claude.ai/api/mcp/auth_callback

2. Add custom connector in Claude:

   • Name: Calorie Tracker

   • Remote MCP server URL: https://YOUR-WORKER.workers.dev/sse

   • OAuth Client ID: <client_id from registration>

   • OAuth Client Secret: <client_secret from registration>

Production Deployment

Deploy to Cloudflare Workers for mobile/web access:

pnpm run deploy
pnpm run migrate
npx wrangler secret put ADMIN_API_KEY

Tools

Food Tracking:

• list_entries - List food entries with pagination

• add_entry - Add food entry with macros

• update_entry - Update existing entry

• delete_entry - Delete entry

Profile Management:

• get_profile - Get profile with BMR/TDEE calculations

• update_profile - Update profile data (height, weight, activity level)

• get_profile_history - Historical tracking data

Admin:

• register_user - Register new user

• revoke_user - Revoke user access

BMR/TDEE Calculations

Uses Mifflin-St Jeor equation (gold standard):

Male: BMR = (10 × weight) + (6.25 × height) - (5 × age) + 5
Female: BMR = (10 × weight) + (6.25 × height) - (5 × age) - 161

TDEE: BMR × Activity Multiplier (1.2 - 1.9)

Development

pnpm test           # Run tests
pnpm run type-check # TypeScript validation
pnpm run deploy     # Deploy to production
pnpm run migrate    # Run migrations on remote

Tech Stack

• Runtime: Cloudflare Workers

• Database: D1 (SQLite)

• Language: TypeScript

• Validation: Zod

• Testing: Vitest