Cua Driver

CUA Driver

Use the CUA Driver MCP tools as the only action surface for desktop automation. Do not use shell, AppleScript, open, cliclick, screenshots outside CUA, or raw cursor/key APIs to drive macOS UI.

Runtime Context

• Plugin id: arkloop.plugins.cua.
• Runtime helper app: CuaDriver.app.
• Runtime binary: CuaDriver.app/Contents/MacOS/cua-driver.
• Accessibility and Screen Recording permissions belong to the helper app bundle, not to Arkloop.

Required Loop

1. Resolve the app with list_apps. Match localized names, English names, romanized names, bundle identifiers, and common abbreviations. Prefer bundle_id as the stable identity.
2. Start or reuse the target with launch_app({ bundle_id }). Use the returned pid when available.
3. Inspect windows with list_windows({ pid }) when the launch result lacks a usable window.
4. Before every UI action, snapshot with get_window_state({ pid, window_id }).
5. Act with the narrowest matching tool: click, right_click, double_click, drag, scroll, type_text, type_text_chars, press_key, hotkey, set_value, page, or launch_app with urls.
6. Snapshot again after every state-changing action and verify visible evidence such as selected state, changed text, playback progress, new panels, highlighted rows, or updated window content.

Element indices are valid only for the latest get_window_state result from the same pid and window_id. Re-snapshot when an index is missing, stale, or from another window.

Permissions

Call check_permissions before the first desktop task. If Accessibility or Screen Recording is missing, tell the user to grant both permissions to CuaDriver.app, then stop until the permission state changes.

Sparse UI Fallback

Some media, browser, and Electron apps expose shallow accessibility trees while still showing actionable pixels. Use this order:

1. Retry get_window_state({ pid, window_id }) once.
2. For browser-like or Electron windows, use page or relaunch with launch_app({ bundle_id, electron_debugging_port: 9222 }) when DOM access is more reliable than pixels.
3. Use screenshot({ window_id }) for broad visual confirmation when the current overlay or window content is unclear.
4. Use at most one zoom({ pid, window_id, x1, y1, x2, y2 }) for dense text or icons.
5. Use pixel coordinates only from the latest full-window screenshot or the single zoom result.
6. Re-snapshot and compare after each action.

Ask the user only when visible candidates are ambiguous, the requested action is destructive, or the target is outside the visible window.

Navigation Patterns

• Launch apps with launch_app({ bundle_id }).
• Open files or URLs with launch_app({ bundle_id, urls: [...] }).
• For browser-like apps, prefer separate windows via launch_app({ bundle_id, urls: [...] }) so each target has a stable window_id.
• Do not use omnibox shortcuts such as cmd+l for navigation. Use launch_app with urls.
• Use visible in-window controls before menu-bar actions. Use menu-bar actions only when the target app is already frontmost and the menu state is visible through the CUA snapshot.

Agent Cursor

Use get_agent_cursor_state to inspect the cursor overlay. Use set_agent_cursor_enabled, set_agent_cursor_motion, or set_agent_cursor_style only when the user asks to show, hide, animate, or restyle the agent cursor.