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Browser

Coding & development

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Updated 10-16 05:05

About this skill

Customization

Before executing, check for user customizations at: ~/.claude/PAI/USER/SKILLCUSTOMIZATIONS/Browser/

If this directory exists, load and apply any PREFERENCES.md, configurations, or resources found there. These override default behavior. If the directory does not exist, proceed with skill defaults.

MANDATORY: Voice Notification (REQUIRED BEFORE ANY ACTION)

You MUST send this notification BEFORE doing anything else when this skill is invoked.

  1. Send voice notification: 
    curl -s -X POST http://localhost:31337/notify \
  -H "Content-Type: application/json" \
  -d '{"message": "Running the WORKFLOWNAME workflow in the Browser skill to ACTION"}' \
  > /dev/null 2>&1 &
  1. Output text notification: 
    Running the **WorkflowName** workflow in the **Browser** skill to ACTION...

This is not optional. Execute this curl command immediately upon skill invocation.

Browser v10.0.0 — Browser Automation

Tool: agent-browser — headless Rust CLI daemon with persistent auth profiles.

If agent-browser isn't working or a site has bot detection, use the Interceptor skill instead. Interceptor is a Chrome extension with zero CDP fingerprint — passes all major bot detection checks.

Does the site need auth?

Use --profile ~/.agent-browser/profiles/<site>. If profile exists, auth is automatic. If not, run --headed once for login, then headless forever.

agent-browser

Native Rust daemon. Persistent profiles for auth. Headless by default.

Quick One-Shot Commands

agent-browser open https://example.com && agent-browser screenshot /tmp/shot.png
agent-browser open https://example.com && agent-browser screenshot --full /tmp/full.png
agent-browser open https://example.com && agent-browser pdf /tmp/page.pdf

Session-Based Interaction

# 1. OPEN
agent-browser open https://example.com

# 2. WORK
agent-browser snapshot                    # a11y tree with @eN refs (for AI)
agent-browser click @e12                  # click by ref
agent-browser fill @e15 "hello"           # fill input by ref
agent-browser screenshot /tmp/shot.png    # screenshot
agent-browser eval "document.title"       # run JS

# 3. CLOSE — when done
agent-browser close

Authenticated Browsing (Per-Site Profiles)

First-time setup (headed, one-time):

# Close any running daemon first
agent-browser close --all

# Launch headed with persistent profile — log in manually
agent-browser --headed --profile ~/.agent-browser/profiles/<site> open https://example.com

# After login completes, all future runs reuse the profile headlessly

Subsequent runs (headless, automatic):

agent-browser --profile ~/.agent-browser/profiles/<site> open https://example.com
# Auth is automatic — cookies, IndexedDB, cache all persist

To add a new site: Close daemon, run --headed --profile ~/.agent-browser/profiles/<name> once, log in, done.

Auth Vault (Alternative)

agent-browser auth save mysite --url https://example.com --username user --password-stdin
agent-browser auth login mysite    # auto-fills login form
agent-browser auth list            # show saved profiles

Batch Execution

# Send multiple commands in one shot (fewer tool calls = fewer tokens)
echo '[["open","https://example.com"],["snapshot"],["click","@e12"]]' | agent-browser batch

Advanced Features

# Connect to already-running Chrome
agent-browser --auto-connect snapshot

# Network interception
agent-browser route "**/*.{png,jpg}" abort     # block images
agent-browser route "https://api.com/*" mock '{"data":"test"}'

# Device emulation
agent-browser --device "iPhone 15" open https://example.com

# Session persistence (cookies + localStorage by name)
agent-browser --session-name myapp open https://example.com

agent-browser Rules

  • Daemon model — first command starts daemon, subsequent commands connect instantly.
  • Refs use @eN syntax — @e12 not e12.
  • Profiles persist everything — cookies, IndexedDB, cache, localStorage.
  • Close with agent-browser close or close --all to kill daemon.

Delegating Browser Work to Agents

When you need parallel or background browser work (scraping multiple pages, monitoring), spawn general-purpose agents with browser instructions. No dedicated browser agent type needed — this skill IS the expertise.

Agent(subagent_type="general-purpose", prompt="
  Use agent-browser CLI for all browser work.
  Commands: open <url>, snapshot, click @eN, fill @eN 'text', screenshot /path.
  For authenticated sites: --profile ~/.agent-browser/profiles/<site>
  Refs use @eN syntax from snapshots.
  [your specific task instructions here]
")

For parallel isolation, each agent uses --session <name>:

Agent 1: agent-browser --session scrape1 open https://site-a.com
Agent 2: agent-browser --session scrape2 open https://site-b.com

Fallback: If agent-browser fails or the site has bot detection, use the Interceptor skill instead.

Legacy built-in agents — DEPRECATED, do not invoke. BrowserAgent and UIReviewer are Claude Code built-ins whose internals cannot be modified; they run browser automation that PAI no longer uses. Route all browser work through the Interceptor skill (verification, authenticated flows) or agent-browser (headless scraping).

Workflow Routing

Trigger Words Workflow What It Does
"review stories", "run stories", "ui review", "validate stories" Workflows/ReviewStories.md Fan out YAML stories to parallel UIReviewers
"automate", "recipe", "template", or a recipe name Workflows/Automate.md Load and execute a parameterized recipe template
"update", "check version" Workflows/Update.md Verify browser tools are current and working

Stories — YAML User Story Validation

Define user stories in YAML and validate them in parallel with UIReviewer agents.

Directory: skills/Browser/Stories/

name: App Name
url: https://example.com
stories:
  - name: Story name
    steps:
      - action: click
        target: "LLM-readable description"
    assertions:
      - type: snapshot_contains
        text: "expected text"

Run with: "review stories" or "run stories in HackerNews.yaml"

Recipes — Parameterized Templates

Reusable Markdown templates with {PROMPT} injection.

Directory: skills/Browser/Recipes/

Recipe Description Tool
SummarizePage.md Extract content summary BrowserAgent
ScreenshotCompare.md Before/after comparison agent-browser
FormFill.md Fill form fields agent-browser

Run with: "automate SummarizePage for https://example.com"

Execution Log

After completing any workflow, append a single JSONL entry:

echo '{"ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","skill":"Browser","workflow":"WORKFLOW_USED","input":"8_WORD_SUMMARY","status":"ok|error","duration_s":SECONDS}' >> ~/.claude/PAI/MEMORY/SKILLS/execution.jsonl