This server has significant definition quality gaps. Tool names are mostly verb-noun compliant (list_app, launch_app, get_screenshot), but descriptions are inconsistent, some are detailed (media_play_pause, get_uilayout), others are terse (volume_up: 'turn up the volume'). Parameter descriptions exist but lack constraints (e.g., 'center' param in click/long_click accepts a string like '(x, y)' but no validation rules). No output schemas are documented. Error handling is minimal, most tools return raw command output without recovery guidance. The 'click' and 'long_click' tools accept coordinate strings instead of structured numeric parameters, forcing LLMs to format coordinates manually. No tool has destructive/idempotent hints. Overall, definitions are functional but lack the rigor needed for reliable agent composition.

• Refactor click/long_click to accept separate x and y integer parameters instead of a string coordinate. Validate ranges (0 to screen width/height) and return clear errors for out-of-bounds values.
• Expand volume_up, volume_down, volume_mute, media_next, media_previous descriptions to 50 - 100 characters. Include context: 'Increases device volume by one step. Use before media_play_pause if audio is too quiet.' This helps LLMs decide when to call these tools.
• Document output schemas for all tools. E.g., list_app returns List[str] (package names); current_app returns Tuple[str, str] (package_name, page_name); get_screenshot returns Image. Include field types and meanings.
• Add error handling with recovery hints. E.g., launch_app should return: 'Package not found. Available packages: [list]. Call list_app() to see all installed apps.' This guides LLM retry logic.
• Add tool annotations: mark stop_app, launch_app, click, swipe, input_text with destructiveHint=true; mark list_app, get_screenshot, get_uilayout with readOnlyHint=true. This enables agents to reason about side effects.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry