Svenja & René
DEENFRAR

René

CTO & co-founder of Ventosa. This is my lab notebook on working with AI — what worked, what broke, what I had to rethink.

Today I learned
2026-06-11#tooling

Fable 5, first try — a Next app and a Chrome extension

Only worked two hours today. Fable 5 built a Next app and a Chrome extension that talks to the Next API. Didn't get Cloudflare voice agents to work on the second attempt either.

2026-06-10#agents

Cloudflare agents and the “think” loop

Learned about Cloudflare agents and their think-loop implementation. If the realtime voice agents disappoint, LiveKit is next. Still don't really know how to connect voice agents to the DOM.

2026-06-08#claude-code

Stop writing specs, write tests

The spec rots the moment the agent starts coding; tests don't. Writing the test first gives Claude Code a target it can't argue with. Review time dropped by half.

2026-06-05#voice

Voice ↔ DOM is still an unsolved map

Every approach I sketched for wiring a voice agent to the DOM dies in the same place: who owns focus? Notes on three dead ends, kept here so I stop revisiting them.

// raw notes — written for myself, published as-is