Browser Control — Chrome DevTools MCP

You automate browser interactions for authenticated web applications using Chrome DevTools Protocol. This connects to a running Brave Browser Nightly instance with a persistent debug profile that preserves login sessions.

Setup — Launch Browser

Before any browser interaction, ensure the debug browser is running:

bash plugins/psd-productivity/skills/browser-control/scripts/launch-chrome.sh

If the script reports already_running, the browser is ready. If started, wait a moment for it to initialize.

First-time setup: After launching, manually log into any sites you need (PowerSchool, Google, etc.). The persistent profile at ~/.psd-browser-automation saves cookies and sessions across restarts.

Core Workflow

1. Check browser status — run launch script with --status
2. Launch if needed — run launch script (no args for visible window)
3. Navigate — use navigate_page to go to URLs
4. Interact — use click, fill, fill_form, type_text, press_key
5. Verify — use take_screenshot or take_snapshot to confirm state
6. Wait — use wait_for when pages are loading or processing

Tool Reference

Navigation & Pages

• navigate_page — go to a URL
• list_pages — list open tabs
• select_page — switch to a tab
• new_page — open new tab
• close_page — close a tab
• resize_page — change viewport size
• handle_dialog — accept/dismiss browser dialogs
• get_tab_id — get current tab identifier

Input

• click — click an element by CSS selector or text
• click_at — click at x,y coordinates
• hover — hover over an element
• fill — fill an input field (clears first)
• type_text — type text character by character
• fill_form — fill multiple form fields at once
• press_key — press keyboard keys (Enter, Tab, Escape, etc.)
• upload_file — upload a file to a file input
• drag — drag from one element to another

Observation

• take_screenshot — capture visible page as image
• take_snapshot — get accessibility tree (structured page content)
• wait_for — wait for an element, text, or network idle
• evaluate_script — run JavaScript in the page context

Console & Network

• list_console_messages — view browser console output
• get_console_message — get details of a console message
• list_network_requests — view network activity
• get_network_request — get details of a network request

Best Practices

1. Always take_snapshot first — before clicking or filling, get the page structure to identify correct selectors
2. Use wait_for after navigation — pages may not be fully loaded immediately
3. Handle dialogs proactively — PowerSchool shows confirm dialogs; use handle_dialog to accept/dismiss
4. Use fill_form for multiple fields — more efficient than individual fill calls
5. Screenshot for verification — take screenshots after important actions to confirm success
6. Check for errors — use list_console_messages if something seems wrong

PowerSchool-Specific Knowledge

When automating PowerSchool reports, run all browser automation directly in the main session — do not delegate to a subagent (subagents cannot access MCP tools). Key patterns:

1. Verify the correct school is selected (top banner)
2. Use the navigation paths from plugins/psd-productivity/skills/enrollment/references/
3. Elementary uses 1-Day FTE window; Middle/High use 5-Day window
4. Save reports with consistent naming: [SchoolAbbr]_[ReportName]_[CountDate]

Troubleshooting

• "Browser not running" — Run the launch script
• "Connection refused on 9222" — Browser crashed; kill orphan processes and relaunch
• "Login required" — Open the browser window, log in manually, then retry
• "Element not found" — Take a snapshot to see current page structure, adjust selector
• Page loads slowly — Use wait_for with appropriate timeout before interacting