End-user Β· UAT Β· QA agent Β· Open source
Fagun gives any AI a real browser β to use your product like real customers (mobile, slow-internet, keyboard-onlyβ¦), walk whole journeys, hunt real bugs, and return a product-readiness verdict.
Works in Claude, Cursor, Codex & more. fagun deep test URL automatically uses Chrome DevTools MCP when available, reuses signed-in Chrome after you click Allow, and still prints the full Fagun result.
Install in one line
Choose one setup path: uvx fagun init if you want no Python setup, or pip install --upgrade fagun && fagun init if you already use pip. Seeing old output? Force refresh with uvx --upgrade --reinstall fagun init.
Full workflow
Users only need to install once, restart the AI tool, then type fagun deep test URL. Fagun handles browser setup, Chrome DevTools MCP auto-connect, testing, evidence, and the final report.
uvx fagun init
or pip install fagun && fagun init
Claude, Codex, Cursor, Windsurf, VS Code load the Fagun MCP server and skill.
Auto-connects to signed-in Chrome. User clicks Allow if Chrome asks.
Crawl, journeys, forms, links, console, network, a11y, perf, security.
Every finding gets observed proof, severity, repro steps, impact, and fix.
Full Fagun answer in chat plus HTML, Markdown, JSON, or JUnit report.
What it does
Deep test covers the full readiness surface: journeys, auth, links, console, network/API, forms, validation, accessibility, performance, SEO, visual layout, responsive breakpoints, keyboard use, security headers, CORS/CSP, exposed files/secrets, XSS/redirect signals, reports, and safe external security-tool planning.
Works everywhere
See it in action
One command sets up every AI tool on your machine. Then just type fagun deep test URL; no separate Chrome-connect command is needed.