Agentation Self-Driving Mode

Autonomously critique a web page by adding design annotations via the Agentation toolbar — in a visible headed browser so the user can watch the agent work in real time, like watching a self-driving car navigate.

Launch — Always Headed

The browser MUST be visible. Never run headless. The user watches you scan, hover, click, and annotate.

Preflight: Verify agent-browser is available before anything else:

command -v agent-browser >/dev/null || { echo "ERROR: agent-browser not found. Install the agent-browser skill first."; exit 1; }

Launch: Try opening directly first. Only close an existing session if the open command fails with a stale session error — this avoids killing a browser someone else is using:

# Try to open. If it fails (stale session), close first then retry.
agent-browser --headed open <url> 2>&1 || { agent-browser close 2>/dev/null; agent-browser --headed open <url>; }

Then verify the Agentation toolbar is present and expand it:

# 1. Check toolbar exists on the page (data-feedback-toolbar is the root marker)
agent-browser eval "document.querySelector('[data-feedback-toolbar]') ? 'toolbar found' : 'NOT FOUND'"
# If "NOT FOUND": Agentation is not installed on this page — stop and tell the user

# 2. Expand ONLY if collapsed (clicking when already expanded collapses it)
agent-browser eval "document.querySelector('[data-feedback-toolbar][class*=expanded]') ? 'already expanded' : (document.querySelector('[class*=toggleContent]')?.click(), 'expanding')"

# 3. Verify: take a snapshot and look for toolbar controls
agent-browser snapshot -i
# If expanded: you'll see "Block page interactions" checkbox, color buttons (Purple, Blue, etc.)
# If collapsed: you'll only see the small toggle button — retry step 2

"Block page interactions" must be checked (default: on).

eval quoting rule: Always use [class*=toggleContent] (no quotes around the attribute value) in eval strings. Do not use double-bang in eval because bash treats it as history expansion. Do not use backslash-escaped inner quotes either, as they break unpredictably across shells.

Critical: How to Create Annotations

Standard element clicks (click @ref) do NOT trigger annotation dialogs. The Agentation overlay intercepts pointer events at the coordinate level. Use coordinate-based mouse events — this also makes the interaction visible in the browser as the cursor moves across the page.

@ref compatibility: Only click, fill, type, hover, focus, check, select, drag support @ref syntax. The commands scrollintoview, get box, and eval do NOT — they expect CSS selectors. Use eval with querySelector for scrolling and position lookup.

# 1. Take interactive snapshot — identify target element and build a CSS selector
agent-browser snapshot -i
# Example: snapshot shows  heading "Point at bugs." [ref=e10]
# Derive a CSS selector: 'h1', or more specific: 'h1:first-of-type'

# 2. Scroll the element into view via eval (NOT scrollintoview @ref — that breaks)
agent-browser eval "document.querySelector('h1').scrollIntoView({block:'center'})"

# 3. Get its bounding box via eval (NOT get box @ref — that also breaks)
agent-browser eval "((r) => r.x+','+r.y+','+r.width+','+r.height)(document.querySelector('h1').getBoundingClientRect())"
# Returns: "383,245,200,40"  (parse these as x,y,width,height)

# 4. Move cursor to element center, then click
#    centerX = x + width/2,  centerY = y + height/2
agent-browser mouse move <centerX> <centerY>
agent-browser mouse down left
agent-browser mouse up left

# 5. Get the annotation dialog refs — read the FULL snapshot output
#    Dialog refs appear at the BOTTOM of the list, don't truncate with head/tail
agent-browser snapshot -i
# Look for: textbox "What should change?" and "Cancel" / "Add" buttons

# 6. Type critique — fill and click DO support @ref
agent-browser fill @<textboxRef> "Your critique here"

# 7. Submit (Add button enables after text is filled)
agent-browser click @<addRef>

If no dialog appears after clicking, the toolbar may have collapsed. Re-expand (only if collapsed) and retry:

agent-browser eval "document.querySelector('[data-feedback-toolbar][class*=expanded]') ? 'ok' : (document.querySelector('[class*=toggleContent]')?.click(), 'expanded')"

Building CSS selectors from snapshots

The snapshot shows element roles, names, and refs. Map them to CSS selectors:

Snapshot line	CSS selector
heading "Point at bugs." [ref=e10]	h1 or h1:first-of-type
button "npm install agentation Copy" [ref=e15]	button:has(code) or by text content via eval
link "Star on GitHub" [ref=e28]	a[href*=github]
paragraph (long text...) [ref=e20]	Target by section: section:nth-of-type(2) p

When in doubt, use a broader selector and verify with eval:

agent-browser eval "document.querySelector('h2').textContent"

The Loop

Work top-to-bottom through the page. For each annotation:

1. Scroll to the target area via eval (scrollIntoView)
2. Pick a specific element — heading, paragraph, button, section container
3. Get its bounding box via eval (getBoundingClientRect)
4. Execute the coordinate-click sequence (mouse move → mouse down → mouse up)
5. Read the full snapshot output to find dialog refs at the bottom
6. Write the critique (fill @ref) and submit (click @ref)
7. Verify the annotation was added (see below)
8. Move to the next area

Verifying annotations

After submitting each annotation, confirm the count increased:

agent-browser eval "document.querySelectorAll('[data-annotation-marker]').length"
# Should return the expected count (1 after first, 2 after second, etc.)

If the count didn't increase, the submission failed silently — re-snapshot and check if the dialog is still open.

Aim for 5-8 annotations per page unless told otherwise.

What to Critique

Area	What to look for
Hero / above the fold	Headline hierarchy, CTA placement, visual grouping
Navigation	Label styling, category grouping, visual weight
Demo / illustrations	Clarity, depth, animation readability
Content sections	Spacing rhythm, callout treatments, typography hierarchy
Key taglines	Whether resonant lines get enough visual emphasis
CTAs and footer	Conversion weight, visual separation, final actions

Critique Style

2-3 sentences max per annotation:

• Specific and actionable: "Stack the install command below the subheading at 16px" not "fix the layout"
• 1-2 concrete alternatives: Reference CSS values, layout patterns, or design systems
• Name the principle: Visual hierarchy, Gestalt grouping, whitespace, emphasis, conversion design
• Reference comparable products: "Like how Stripe/Linear/Vercel handles this"

Bad: "This section needs work" Good: "This bullet list reads like docs, not a showcase. Use a 3-column card grid with icons — similar to Stripe's guidelines pattern. Creates visual rhythm and scannability."

Install

The skill must be symlinked into ~/.claude/skills/ for Claude Code to discover it:

ln -s "$(pwd)/skills/agentation-self-driving" ~/.claude/skills/agentation-self-driving

Restart Claude Code after installing. Verify with /agentation-self-driving — if it loads the skill instructions, the symlink is working.

Troubleshooting

• "Browser not launched. Call launch first.": Stale session from a previous run — run agent-browser close 2>/dev/null then retry the --headed open command
• Toolbar not found on page: Agentation isn't installed — run /agentation to set it up first
• No dialog after clicking: Toolbar collapsed — re-expand with the state-aware eval (check [class*=expanded] first), retry
• Wrong element targeted: Click Cancel, scroll to intended element, retry with correct coordinates
• Add button stays disabled: Text wasn't filled — re-snapshot and fill the textbox
• Page navigated: "Block page interactions" is off — enable via toolbar settings
• Annotation count didn't increase: Submission failed — dialog may still be open, re-snapshot and check
• Interrupted mid-run (Ctrl+C): The browser stays open with whatever state it was in. Run agent-browser close to clean up before starting a new session

agent-browser Pitfalls

These will silently break the workflow if you're not aware of them:

Pitfall	What happens	Fix
scrollintoview @ref	Crashes: "Unsupported token @ref while parsing css selector"	Use eval "document.querySelector('sel').scrollIntoView({block:'center'})"
get box @ref	Same crash — get box parses refs as CSS selectors	Use eval "((r)=>r.x+','+r.y+','+r.width+','+r.height)(document.querySelector('sel').getBoundingClientRect())"
eval with double-bang	Bash expands double-bang as history substitution before the command runs	Use expr !== null or expr ? true : false instead
eval with backslash-escaped quotes	Escaped inner quotes break across shells	Drop the quotes: [class*=toggleContent] works for simple values without spaces
snapshot -i | head -50	Annotation dialog refs (textbox "What should change?", Add, Cancel) appear at the BOTTOM of the snapshot	Always read the full snapshot output — never truncate
click @ref on overlay elements	The click goes through to the real DOM, bypassing the Agentation overlay	Use mouse move → mouse down left → mouse up left for coordinate-based clicks that the overlay intercepts
--headed open fails with "Browser not launched"	Stale sessions from previous runs block new launches	Run agent-browser close 2>/dev/null then retry the open command

Rule of thumb: @ref works for interaction commands (click, fill, type, hover). For everything else (eval, get, scrollintoview), use CSS selectors via querySelector in an eval.

Two-Session Workflow (Full Self-Driving)

With MCP connected (toolbar shows "MCP Connected"), annotations auto-send to any listening agent. This enables:

• Session 1 (this skill): Watches the page, adds critique annotations in the visible browser
• Session 2: Runs agentation_watch_annotations in a loop, receives annotations, edits code to address each one

The user watches Session 1 drive through the page in the browser while Session 2 fixes issues in the codebase — fully autonomous design review and implementation.