Show HN: Manifest – a cheap fingerprint endpoint for detecting page changes

Manifest, a new open-source tool, provides a structured endpoint that maps every button, form, and input on a webpage for AI agents, solving the problem of agents guessing actions or relying on fragile hand-written selectors. The tool turns any URL into a machine-readable manifest of available actions and their requirements, aiming to make web interactions more reliable for automated agents.

The internet, readable by agents. Manifest turns any URL into a structured map of what an AI agent can actually do on a page - every button, form, and input, with the fields it needs to fill and what's required before it can move on. The problem Give an AI agent a browser, and it can see a webpage. Give it a scraper, and it can read one. Neither tells it what it's allowed to do there. Today, agents either take a screenshot and guess, or a developer hand-writes selectors that break the next time the page ships a redesign. There's no layer that tells an agent: here are the actions on this page, here's what each one needs, here's what's required. That's the gap Manifest fills.