Building a Personal Knowledge API for Agents

You probably have notes. They are probably in a tree of markdown files, a SaaS product, or a graveyard of Google Docs. None of those are agent-friendly. Building a tiny personal API for them is one of the highest-leverage things you can ship this year.

What the API needs

• One stable URL per note. Permalinks make the difference.
• A /search endpoint that returns structured results, not HTML.
• Format negotiation. Most agents want JSON; you will want TOON for big dumps.
• A rate limit and a clear 429. Even you, on a bad day, should not be able to melt your own laptop.

What it does not need

• Authentication (you are the only client).
• A web UI. Curl is the UI.
• Versioning beyond updated_at.

A good first project

Take your existing notes folder, add a 50-line static site generator that emits one HTML file per note plus an index, and front it with the same CDN your blog uses. That is your personal knowledge API. The agent reads it; you read it; nobody else has to.