PR Screenshot Skill

Add screenshots to a pull request using browser automation and GitHub CDN.

Arguments

• $ARGUMENTS – PR number and optional description of what to screenshot

Execution Steps

1. Parse Arguments & Get Repo Info

# Get current repo info (works in any repo)
REPO=$(gh repo view --json nameWithOwner -q .nameWithOwner)

# Get PR info
gh pr view <PR_NUMBER> --json headRefName,title,body

# Checkout the PR branch
git checkout <branch-name>

2. Start Dev Server

pnpm dev &
sleep 5
# Note the port (usually 3000 or 3001 if 3000 is in use)

3. Take Screenshots with agent-browser

# Open the page
agent-browser open "http://localhost:3000/path/to/feature"

# Wait for page load
sleep 2

# Get interactive elements
agent-browser snapshot -i

# Login if needed (check CLAUDE.md for credentials)
agent-browser fill @e1 "email"
agent-browser fill @e2 "password"
agent-browser click @e3

# Navigate to the feature
agent-browser click @eN

# For expandable sections, use JavaScript
agent-browser eval "document.querySelector('details summary').click()"

# Scroll to show relevant content
agent-browser eval "document.querySelector('selector').scrollIntoView({ block: 'start' })"

# Take screenshot
agent-browser screenshot docs/screenshot/feature-name.png

4. Save Screenshots

All screenshots must be saved to docs/screenshot/:

mkdir -p docs/screenshot
# Screenshot directly to: docs/screenshot/<descriptive-name>.png

Naming convention:

• feature-overview.png – main view
• feature-expanded.png – expanded/detailed view
• feature-empty.png – empty state
• feature-loading.png – loading state

5. Commit & Push

git add docs/screenshot/
git commit -m "$(cat <<'EOF'
docs: add screenshots for [feature]

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
EOF
)"
git push

6. Update PR Body with Screenshots

IMPORTANT: Use GitHub CDN URL format with ?raw=true:

https://github.com/<REPO>/blob/<BRANCH>/docs/screenshot/<filename>.png?raw=true

Where <REPO> is the nameWithOwner from step 1 (e.g., owner/repo-name).

Update PR body:

gh pr edit <PR_NUMBER> --body "$(cat <<'EOF'
# PR Title

## Summary
[existing summary]

## Screenshots

### Feature Overview
![Overview](https://github.com/<REPO>/blob/<BRANCH>/docs/screenshot/feature-overview.png?raw=true)

### Expanded View
![Expanded](https://github.com/<REPO>/blob/<BRANCH>/docs/screenshot/feature-expanded.png?raw=true)

[rest of PR body]
EOF
)"

7. Clean Up

agent-browser close
pkill -f "next dev" || true
git checkout main

GitHub CDN URL Format

Always use this exact format for images to render in GitHub:

https://github.com/OWNER/REPO/blob/BRANCH/path/to/image.png?raw=true

• OWNER/REPO: Get from gh repo view --json nameWithOwner -q .nameWithOwner
• BRANCH: The PR branch name (get from gh pr view)
• ?raw=true: Required suffix for images to display

Authentication

If the app requires login, check the project’s CLAUDE.md for test credentials.

Tips

• Take multiple screenshots showing different states
• Use agent-browser tab list to see all open tabs
• Use agent-browser tab N to switch tabs
• For elements not in snapshot, use CSS selectors: agent-browser click "button.submit"
• Scroll with: agent-browser scroll down 500