Hybra: fitness and sports coaching agent
A lot of what I’ve written lately is the work of making that agent reliable in production.
- Forced tool routing needs a confirmation gate. A two-word message archived a whole training plan. The fix is a gate the server won’t skip.
- The fix I didn’t write. A burst raced past the spend cap, so I capped concurrency with a lock the architecture already had.
- Isolation by address, not by check. I went after the worst bug in the stack, one user reaching another’s data. The boundary held.
- You can’t secure an agent from the prompt. The rule under all of it: what holds is code, not a sentence in the persona.
sensei-eval: An Evals Harness for Agents
iOS Simulator Agent Driver: Agentic Mobile Testing
An MCP server that drives the iOS simulator so an agent can test a mobile app end to end. Four personas across four simulators at once, asserting on the accessibility tree instead of a screenshot.
Just for fun
3D Marquee Globe
An LED marquee wrapped around a sphere in the browser. Scrolling text rendered as glowing dots on an orb you can drag and spin. Three.js and React Three Fiber, 60fps. No agents, no production stakes. I built it the week matrix math finally clicked. How I built it.