Video Recording

Video Recording (WebReel)

Record polished browser verification videos using a two-phase workflow:

1. Phase 1 — Test & collect selectors (agent-browser): Run your scenario interactively, validate every element, and collect CSS selectors.
2. Phase 2 — Record (WebReel): Build a config from your selectors, then render a scripted video with smooth cursor, timing, and encoding.

For WebReel config format, step types, config patterns, and troubleshooting, load the webreel skill. You MUST follow the config patterns defined in the webreel skill — especially moveTo before every click, pause 5x multiplier, charDelay 120+, and clickDwell 500.

Phase 1: Test & Collect Selectors (agent-browser)

Before recording, you MUST run the full verification scenario with agent-browser and collect CSS selectors for every element you will interact with in the video.

1. Navigate and test

agent-browser open http://localhost:3000
agent-browser click @e1
agent-browser wait 500
agent-browser scroll down 300

2. Discover CSS selectors for each interactive element

For every element you click, type into, hover, or scroll, find a stable CSS selector:

agent-browser eval "JSON.stringify((() => { const el = document.querySelector('[data-testid=submit-btn]'); return el ? {tag: el.tagName, text: el.textContent?.trim()} : null })())"

Selector priority (most stable → least stable):

1. [data-testid="..."] — test IDs are the most reliable
2. [role="..."] + text — ARIA roles with text matching
3. Semantic HTML — button, a[href="..."], input[name="..."]
4. Stable classes — .nav-item, .submit-button (avoid generated hashes like .css-1a2b3c)
5. Scoped selectors with within — for repeated components

3. Track selectors as you go

Keep a running list of selectors as you test. Example:

- Login button:     button[data-testid="login-btn"]
- Email input:      input[name="email"]
- Password input:   input[name="password"]
- Submit:           form .submit-button
- Dashboard nav:    nav a[href="/dashboard"]

4. Validate selectors

Before moving to Phase 2, verify each selector resolves:

agent-browser eval "document.querySelector('button[data-testid=login-btn]')?.tagName ?? 'NOT FOUND'"

Phase 2: Record with WebReel

Once your test passes and you have all selectors, build a WebReel config and record.

1. Build config

IMPORTANT: Load the webreel skill and follow its config patterns. You MUST use moveTo before every click, 5x pause multiplier, charDelay 120+, and clickDwell 500. Configs that skip these produce unwatchable videos.

scripts/twill-video-build-config '{
  "url": "http://localhost:3000",
  "output": "verification.mp4",
  "viewport": { "width": 1920, "height": 1080 },
  "clickDwell": 500,
  "steps": [
    { "action": "pause", "ms": 5000, "description": "Initial view (~1s on screen)" },
    { "action": "moveTo", "selector": "button[data-testid=login-btn]" },
    { "action": "pause", "ms": 3000, "description": "Cursor dwells (~0.6s)" },
    { "action": "click", "selector": "button[data-testid=login-btn]" },
    { "action": "pause", "ms": 5000, "description": "Show form (~1s)" },
    { "action": "type", "text": "user@example.com", "selector": "input[name=email]", "charDelay": 120 },
    { "action": "type", "text": "password123", "selector": "input[name=password]", "charDelay": 120 },
    { "action": "moveTo", "selector": "form .submit-button" },
    { "action": "pause", "ms": 3000 },
    { "action": "click", "selector": "form .submit-button" },
    { "action": "wait", "selector": "nav a[href=\"/dashboard\"]", "timeout": 5000 },
    { "action": "pause", "ms": 10000, "description": "Show dashboard (~2s on screen)" }
  ]
}'

2. Preview (optional)

webreel preview

3. Record

scripts/twill-video-record webreel.config.json $TWILL_SCREENSHOTS_DIR

This runs webreel record, copies the output to $TWILL_SCREENSHOTS_DIR, and prints the final path as JSON.

4. Upload and share

NEVER record a video without sharing it

If you record a video, you MUST upload it AND include it in your final answer. No exceptions. A video that is recorded but not shared is wasted work — the user never sees it, integrations never receive it, and the recording was pointless.

Upload

curl -s -X POST -H "Authorization: Bearer $TWILL_API_KEY" \
  -F "file=@$TWILL_SCREENSHOTS_DIR/verification.mp4" \
  "$TWILL_SCREENSHOT_UPLOAD_URL"

The response is JSON: { "url": "<public-url>" }. Save the URL — you need it for both outputs below.

Include in your final answer (REQUIRED)

ALWAYS include the video in your final answer using markdown image syntax — the Twill UI renders .mp4 URLs as inline video players. This is how the user and integrations (GitHub, Slack, Linear) see your work:

![Screen recording](<uploaded-url>)

Include in the PR description (REQUIRED if opening/updating a PR)

Paste the .mp4 URL as a bare URL on its own line — no markdown syntax. GitHub only renders inline video players from bare URLs:

https://storage.googleapis.com/.../verification.mp4

Do NOT use ![](url) or [](url) in the PR body — GitHub renders those as broken images.

Self-check before finishing

Before writing your final answer, verify:

• Video was uploaded (you have a public URL)
• Video appears in the final answer as ![Screen recording](url)
• If a PR was created/updated, video URL is in the PR body as a bare URL on its own line