Idea: semantic verification layer for Stagehand actions

Since Stagehand handles the "act" part, I've been exploring whether a "verify" layer adds value, confirming the agent is interacting with the right element before/after action.

I built balage-core, an open-source npm library that does semantic page analysis: given raw HTML, it returns detected endpoints (auth, search, checkout, consent) with confidence scores and evidence chains. MIT licensed, ~4ms heuristic mode, no browser dependency.

F1 = 66% across 20 real production websites. Alpha quality, known gaps (Angular Material SPAs, multi-step auth).

npm: https://www.npmjs.com/package/balage-core GitHub: https://github.com/osaka2077/balage-ainw MCP: npx -y balage-mcp (works with Claude Desktop)

Happy to build a Stagehand integration PoC if there's interest. Would appreciate any feedback on whether this direction is useful.