Show HN: Libretto – Making AI browser automations deterministic

Thanks! Please try it out. Stop by in the Discord or Github Issues if you have any questions!

Curious how you handle target site changes - does the agent get triggered to regenerate, or do you just wait for the script to fail in prod first?

Very interesting idea. Old school solutions but with new methods. But maybe we can't make everything deterministic for complex cases, the scenarios that opened after LLM arrived into scene. Maybe we need a mix of both.

I believe it generates playwright scripts (non deterministically) which are saved and executed again (deterministically)

1. playwright-cli for exploration and ad-hoc scraping, in order to determine what works.

2. playwright code generation based on 1, which captures a repeatable workflow

3. agent skills - these can be playwright based, but in some cases if I can just rely on built-in tools like Web Search and Web Fetch, I will.

playwright is one of the unsung heroes of agentic workflows. I heavily rely on it. In addition to the obvious DOM inspection capabilities, the fact that the console and network can be inspected is a game changer for debugging. watching an agent get rapid feedback or do live TDD is one of the most satisfying things ever.

Browser automation and being able to record the graphics buffer as video, during a run, open up many possibilities.