14 tools with mixed quality. Naming is verb-forward and clear (list_windows, get_window, activate_window, click, drag, press_key, etc.), following pattern:tool conventions well. However, descriptions are inconsistent: some are terse (10-30 chars, e.g. 'List available windows on the desktop'), while others lack parameter-level documentation. Input schemas are present for all tools but vary in completeness, complex tools like click, drag, press_key, and scroll share a large nested window object and action_intent structure, yet lack descriptions for nested fields (appId, pid, hwnd, generation, kind, summary). Output schemas are not documented anywhere in the provided source. Error handling and recovery guidance are absent. No tool annotations (readOnlyHint/destructiveHint/idempotentHint) despite clear risk classifications (READ_ONLY vs WRITE). Composition is reasonable, tools are single-purpose, but chaining is not optimized (e.g., get_window_state returns observation_id and screenshot_id but downstream tools accept them as optional params, unclear if required for context).

• Add field-level descriptions to nested objects. For window object, document: appId (application identifier), pid (process ID), hwnd (window handle), generation (version/state token). For action_intent, document: kind (one of: navigate, edit, select, move, dismiss, send, submit, publish, delete, purchase, approve, upload, change_access, expose_sensitive_data, install), summary (human-readable intent description).
• Document output schemas for all tools. E.g., list_windows should return {windows: [{appId, pid, hwnd, title, generation}], total: number}. get_window_state should return {screenshot: string, elements: [...], observation_id: string}. This enables LLM chaining.
• Expand tool descriptions to 50-150 characters with WHEN guidance. E.g., 'Activate a window and bring it to foreground. Use this before interacting with a window to ensure it receives input focus. Requires a valid window object from list_windows or get_window.'
• Add error handling guidance to mutation tools. E.g., click: 'Returns error if window is not found or coordinates are out of bounds. Retry after calling get_window_state to refresh UI state. If element is not visible, scroll first.'
• Annotate tools with readOnlyHint and destructiveHint. Mark list_windows, get_window, get_window_state, find_elements, get_app_state with readOnlyHint=true. Mark launch_app, activate_window, click, drag, press_key, scroll, set_value, type_text, perform_secondary_action with destructiveHint=true (or false if truly safe).