QA

Drive a website with a real browser, judge how well it does the thing the user asked about, and return a score from 1 (broken) to 5 (excellent) with evidence. The deliverable is a verdict, not a screenshot dump.

Inputs

From the user's invocation (the text after /qa, or their message):

• Target — a URL (https://…) or a local dev server (localhost:5173, :3000, "the app on 5173"). Required — if absent, ask for it before doing anything else.
• What to test (optional) — a flow or focus ("the signup", "search + filters"). If omitted, test the most obvious happy path and say so in the report.

Dependency: browser-harness (required — install it yourself)

This skill runs the test through browser-harness — a separate CLI you install once. It is not optional; QA must run on a real Browser Use cloud browser, never the user's local Chrome.

Before anything else, verify it's available:

command -v browser-harness && browser-harness <<'PY'
print("browser-harness OK")
PY

If browser-harness is not on PATH, install it yourself — don't make the user do it. QA runs on a cloud browser, so the CLI is all you need: none of browser-harness's local-browser setup (chrome://inspect, the "Allow remote debugging" popup) applies here — skip all of it. The install is one-time (~30s), no clone:

command -v uv || curl -LsSf https://astral.sh/uv/install.sh | sh   # the uv installer, only if missing
export PATH="$HOME/.local/bin:$PATH"                               # uv and its tool shims land here; the installer doesn't update the current shell's PATH
uv tool install --python 3.12 --upgrade browser-harness            # latest stable release from PyPI
command -v browser-harness                                         # verify it's on PATH now

(No uv and can't curl | sh? Install uv per https://docs.astral.sh/uv/getting-started/installation/ then re-run the uv tool install line — or pipx install browser-harness.)

Do not attempt to QA with anything other than browser-harness + a cloud browser.

Procedure

1. Confirm the target is reachable (curl -s -o /dev/null -w "%{http_code}" <url>), and identify what the app is (title, README) so you can frame a sensible test task.
2. Read references/methodology.md in this skill directory and follow it exactly. It defines: how to get a Browser Use API key (or self-sign-up), how to tunnel a localhost app and point a cloud browser at it, the field-tested gotchas (host-header rewrite, proxy-off, the per-tab interstitial header, CORS-pinned APIs), the test loop, the 1-5 rubric, and the output format.
3. Run the test, then tear everything down (stop the cloud browser so it stops billing; kill the tunnel).
4. Return the verdict: lead with Score: N/5, then task, result, what worked, issues (tagged), edge cases tried, and screenshot evidence — exactly as references/methodology.md specifies.

Scale effort to the ask: a quick "does X work?" is a few interactions and one score; "thoroughly QA this" warrants more flows and edge cases. Keep the verdict honest, specific, and reproducible.