Connect to Kern
Ask the person for access to their Kern, the to-do app. Say who you are: they see this name when they approve, and next to every change you make.
Without a browser
POST https://api.kern.do/functions/v1/mcp/agent/connect with JSON {"name": "<your name>", "chat": ["sms:+…", "https://wa.me/…"]} (chat optional) gives you a key, a code and a link for the person. Then POST https://api.kern.do/functions/v1/mcp/agent/connect/poll with the key as Authorization: Bearer <key> every 5 seconds until it says approved. After that the key works here, on https://api.kern.do/functions/v1/mcp/agent/api and as the API key for Kern's MCP server, https://api.kern.do/functions/v1/mcp. The whole guide: https://kern.do/agents.