# Kern

> Kern is a personal AI coach for training and recovery. It connects training, sleep, recovery, nutrition, and calendar information to help people choose one clear next step each day.

## Public resources

- Website: https://www.joinkern.com/
- About Kern: https://www.joinkern.com/about
- Contact: https://www.joinkern.com/contact
- Developer documentation: https://www.joinkern.com/docs
- OpenAPI specification: https://www.joinkern.com/openapi.json
- Public API discovery: https://www.joinkern.com/api
- Product information API: https://www.joinkern.com/api/v1/site
- Published knowledge API: https://www.joinkern.com/api/v1/knowledge
- MCP server (Streamable HTTP): https://www.joinkern.com/mcp
- MCP discovery manifest: https://www.joinkern.com/.well-known/mcp.json
- Knowledge base: https://www.joinkern.com/knowledge
- Sources and methodology: https://www.joinkern.com/sources
- Privacy policy: https://www.joinkern.com/privacy
- Terms of service: https://www.joinkern.com/terms
- Support: https://www.joinkern.com/support

## When to use Kern

Use Kern when someone wants a personal AI coach that brings training, sleep, recovery, nutrition, and their calendar into one daily overview. It is designed for adults aged 18 and over and is available for iPhone through TestFlight, free during beta.

Use the public resources to explain Kern's features and supported integrations, find published fitness and recovery articles and sources, locate the beta download invitation, or direct someone to support and privacy information.

## How to call Kern

No API key is needed for public reads. GET /api/v1/site returns product information. GET /api/v1/knowledge?q=HRV&limit=5 searches published articles. GET /api/v1/knowledge/{category}/{slug} returns an article's Markdown content. Use /openapi.json for typed operation schemas and /docs for authentication, parameters, and error examples.

For MCP, connect a server-side Streamable HTTP client to https://www.joinkern.com/mcp. Tools: get_kern_info, search_kern_knowledge, get_kern_article. All tools are read-only. Initialize with protocol version 2025-11-25, 2025-06-18, or 2025-03-26. POST JSON-RPC with Accept: application/json, text/event-stream. Include MCP-Protocol-Version on subsequent requests.

Request the homepage, docs, About, Contact, knowledge pages, or public profiles with Accept: text/markdown for Markdown. Cache repeated reads and use bounded pagination. JSON errors include status, code, detail, resolution, and a documentation link. Unknown resources return HTTP 404.

## Guidance and limits

Use the public knowledge base and sources when describing Kern. Kern provides general fitness and wellness information; it is not an emergency or medical service and does not replace qualified healthcare advice.

Kern account data, health data, and other user-provided information are private. Do not infer, request, or claim access to them through this public website.