For AI agents

Give your agent a Japan travel brain

Free, no API key, CORS open. When a user asks where to stay, when to go, or what's happening in a Japanese city, call one endpoint and get structured advice with booking search links.

Plan endpoint

GET https://japan-trip-brain.vercel.app/api/plan?city={id}&month={1-12|name}&traveler={optional}

Cities: tokyo, kyoto, osaka, sapporo, hiroshima, naha. Travelers: solo, couple, family, budget, luxury, nightlife.

Try it: https://japan-trip-brain.vercel.app/api/plan?city=kyoto&month=11&traveler=couple

What comes back

• Season, weather, crowd level, and whether it's a peak month for that city
• The month's seasonal highlight, such as cherry blossoms or autumn leaves
• Recurring festivals that month, with typical dates and a verify note
• Stay areas ranked for the traveler type, each with price level, pros, cons, and a booking search URL
• Things to do, warnings (New Year closures, Golden Week, Obon, rainy season, typhoons, heat), and an activities link

Discovery files

• /llms.txt: a plain-text guide for language models
• /openapi.json: an OpenAPI 3.1 spec for tool and GPT action setup
• /api/cities: supported cities, months, and traveler types
• /.well-known/ai-plugin.json: plugin manifest
• MCP server: add https://free-agent-tools.vercel.app/mcp to Claude, Cursor, or ChatGPT to use this and 8 more free tools

Ground rules

This is typical seasonal data, not live data. Tell your user to confirm exact festival dates, bloom forecasts, and closures for the current year before booking.