Browser discovery

Browser Discovery Skill

Detect and use browser automation tools for documentation discovery when static fetching fails.

Variables

Variable	Default	Description
PREFERRED_TOOL	auto	auto, antigravity, cursor, playwright
WAIT_TIMEOUT	3	Seconds to wait for JS rendering
MAX_PAGES	50	Maximum pages to discover per site

Instructions

MANDATORY - Follow the Workflow steps below when browser automation is needed.

• Always try curl first unless js_required: true is set
• Detect available browser tools before attempting automation
• Prefer accessibility snapshots over screenshots for link extraction

Quick Decision Tree

Do you need browser automation?
│
├─ Curl returns full content? ──────────► NO - Use curl (docs-fetch-url)
│
├─ Curl returns <1KB or 403? ───────────► YES - Continue below
│
Which browser tool to use?
│
├─ browser_subagent available? ─────────► antigravity-browser.md
│
├─ In Cursor IDE? ──────────────────────► cursor-browser.md
│
├─ Chrome debugging on :9222? ──────────► playwright-browser.md (wrapper)
│
└─ No browser tool? ────────────────────► See "No Browser Available" section

Red Flags - STOP and Reconsider

If you're about to:

• Use browser automation when curl would work
• Skip tool detection and assume a specific tool exists
• Take screenshots when snapshot would provide structured data
• Navigate without waiting for JS rendering

STOP -> Check the appropriate cookbook -> Then proceed

Workflow

1. CHECKPOINT: Verify browser automation is actually needed
   • Curl response < 1KB?
   • Curl gets 403 Forbidden?
   • js_required: true in config?
2. Detect available browser tools (priority order)
3. Select best available tool
4. CHECKPOINT: Read the cookbook for selected tool
5. Execute browser-based discovery
6. Parse results and return structured data

Tool Detection Priority

Priority	Tool	Detection	Best For
1	Antigravity browser_subagent	Tool in tool list	Zero-config native
2	Cursor MCP (in-IDE)	mcp__cursor__browser_*	In Cursor IDE
3	Cursor CLI	which cursor-agent	Delegation from CLI
4	Playwright (wrapper)	curl localhost:9222/json/version	Full automation

Cookbook

Antigravity Browser

• IF: browser_subagent tool available
• THEN: Read cookbook/antigravity-browser.md

Cursor Browser

• IF: In Cursor IDE or cursor-agent available
• THEN: Read cookbook/cursor-browser.md

Playwright Browser

• IF: Chrome debugging accessible at localhost:9222
• THEN: Read cookbook/playwright-browser.md

When Browser Is Needed

Signs that a site requires browser automation:

• Curl response < 1KB (JS-rendered content)
• Response contains "please enable javascript"
• Framework markers: __NEXT_DATA__, window.__remixContext, window.__NUXT__
• Only CSS/font resources returned (no text content)

No Browser Available

If no browser tool is detected:

No browser automation tool detected.

Setup options:
1. Antigravity IDE: Built-in (zero config)
2. Cursor: cursor-agent available when installed
3. Claude Code: Launch Chrome with debugging:
   google-chrome --remote-debugging-port=9222

   Then use the Playwright wrapper:
   python3 .claude/ai-dev-kit/dev-tools/mcp/wrappers/playwright_wrapper.py navigate "https://..."

Output

Return discovered pages as structured data:

{
  "pages": [
    {"url": "...", "title": "...", "section": "..."}
  ],
  "nav_structure": "sidebar | tabs | accordion",
  "js_required": true
}