/skill:jat-verify - Browser Verification

Test work in a real browser. Two modes:

/skill:jat-verify                            # builder-verify, auto-detect what to test
/skill:jat-verify /tasks                     # builder-verify a specific path
/skill:jat-verify --cold https://site.tld    # cold-review an entire experience

NOT for static checks (tests, lint, types) — those live in /skill:jat-complete.

Browser Tooling (both modes)

Attach, don't relaunch. A persistent browser runs on CDP port 9222. NEVER run browser-start.js --port 9222 (it kills the persistent browser). Preferred, in order:

1. chrome-devtools MCP tools (mcp__chrome-devtools__*) — available in most sessions; use new_page, navigate_page, take_screenshot, take_snapshot, evaluate_script, list_console_messages, emulate.
2. browser-*.js CLI tools (~/.local/bin/) — they attach to :9222 by default. Only use browser-start.js (no --port) for a throwaway instance.

Key techniques:

• Fresh state: new_page with isolatedContext: "review-<id>" gives clean cookies/storage — mandatory for cold-review, useful for auth flows.
• Console errors: list_console_messages with types: ["error","warn"] (+ includePreservedMessages: true after multi-page flows). Do NOT monkeypatch console.error.
• Mobile: emulate with viewport: "390x844x2,mobile,touch" (window resize fails on maximized windows). Clear with empty viewport string.
• Timing: wrap actions in evaluate_script polling loops and record elapsed ms — "felt slow" needs a number.

Mode 1: builder-verify

1. Determine target — URL, feature, success criteria from your recent work. Ask only if genuinely ambiguous.
2. Navigate + screenshot the initial state.
3. Operate the feature — click/fill/submit the real UI (snapshot → click by uid, or evaluate_script). Screenshot after each significant action.
4. Check console (list_console_messages, errors + warnings). Note pre-existing vs new.
5. Report pass/fail checklist + screenshot paths. Failed → fix, re-verify, then return to 🔍 READY FOR REVIEW.

Mode 2: cold-review (fresh-eyes reviewer pass)

Role-play the coldest plausible visitor (a customer prospect, a contest judge, a new hire). You are NOT the builder — be a skeptic, try to break it. The value is what a stranger trips on that the builders can no longer see.

Rules of engagement:

1. Blank slate: isolated browser context, no reading the code first. Discover the experience the way a visitor does.
2. The three questions, at every surface: (a) What am I looking at? (b) What am I supposed to do here? (c) After I do it, what happens and where do I go next? Any surface that fails one of these is a finding.
3. Operate everything. Every primary CTA gets clicked, every flow completed for real. If it generates, generate. If it uploads, upload. A button that appears to do nothing is a finding even if code says it works.
4. Follow every outbound link and promised artifact (docs, GitHub, "read more", download). A 404 on a link the experience depends on is a blocker. (Real case: a contest demo's README link — the judged criterion — 404'd for signed-out visitors.)
5. Hunt the promised moments. Anything the copy promises ("watch it refuse", "see X happen") must be reachable by following the on-screen guidance alone. If you need expert knowledge or N extra steps to trigger it, the demo's money moment is buried — major finding.
6. Adversarial inputs: bare domains, garbage input, nonexistent resources, double-clicks, back-button. Clean failure = pass; dead spinner/blank = finding.
7. Time everything that runs async. Report dead spinners, hangs, and anything > a few seconds with no progress feedback.
8. Mobile pass (~390px emulation) over each major surface: horizontal overflow, tap targets, legibility.
9. Console sweep on every page visited.
10. Screenshot the notably good AND the notably broken.

Report format:

COLD REVIEW: <target>
1. First impression — honest 5-second and 30-second reactions
2. Walk-through, surface by surface — three questions answered; what worked; what confused
3. Findings ranked: BLOCKERS (visitor bounces) → MAJOR (money moment lost) → PAPERCUTS
4. Strengths — what specifically lands (so fixes don't break it)
5. Screenshot index

Be blunt; flattery is useless. If it's great, say what specifically lands.

The loop — cold-review is step 1 of 3:

cold-review (reviewer) → fix wave (builder) → RE-VERIFY (same reviewer)

The re-verify is not optional: run the same E2E path again and hunt second-order leaks — the layer below the fixes. (Real cases: after a theming fix, outtake rows still carried the old vertical; a {{first_name}} fallback rendered a literal "there"; stale cache entries from before the fix silently bypassed it.) Fixes introduce their own disconnects; only the same cold path finds them.

Signals: in a JAT task session, emit jat-signal review with findings (ranked) before presenting; blockers/major items go in doNow/suggestedTasks.

After Verification

• builder-verify passed → 🔍 READY FOR REVIEW; user can /jat:complete.
• builder-verify failed → fix, re-verify, then review state.
• cold-review → deliver the report; do NOT fix unless asked (the deliverable is the reviewer's perspective, and the builder may be mid-flight on the same files).