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agent-browser

vercel-labs/agent-browser is an AI-driven browser-verification tool maintained by Vercel Labs. Lets an AI coding agent open a real browser, take actions, and verify rendered output / client-side navigation / hydration behaviour.

Role on this wiki

Used by vinext's author in the one-week rewrite to catch subtle browser-runtime issues that unit tests miss: "Unit tests miss a lot of subtle browser issues. This caught them." Pairs with Playwright (scripted E2E) as the browser-verification side of AI agent guardrails.

Seen in

• sources/2026-02-24-cloudflare-how-we-rebuilt-nextjs-with-ai-in-one-week

Related

• systems/playwright — scripted-E2E peer.
• systems/vinext — production consumer.
• concepts/ai-agent-guardrails — the broader discipline.