🔨 Building

dev-agent: an agent that runs its own dev stack and fixes bugs

21 May 2026 •

I saw a workshop by Jarred Sumner (the creator of Bun) about robobun, a bot that automatically reproduces issues whenever someone opens one on GitHub. I wanted to try the same idea myself.

dev-agent is an agent that already has the dev stack up and running, so it can reproduce a bug report, QA it in a real browser, take screenshots, and then have a go at fixing it. I got it working well enough that it reproduced and solved a bug on Mealie, an open source meal tracker.

The thing I like most about it: it’s a good test of how agent-friendly your codebase actually is. If an agent can’t easily set up the dev environment and debug, that tells you something.

Source and a write-up of the design on GitHub.