Browser Discovery Skill Skill

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

[ ] CHECKPOINT: Verify browser automation is actually needed
- Curl response < 1KB?
- Curl gets 403 Forbidden?
- js_required: true in config?
[ ] Detect available browser tools (priority order)
[ ] Select best available tool
[ ] CHECKPOINT: Read the cookbook for selected tool
[ ] Execute browser-based discovery
[ ] 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
}

Agent Skills: Browser Discovery Skill

Install this agent skill to your local

Skill Files