Critical gaps across all dimensions. Tool names lack clear action verbs (calendar_read_events vs get_calendar_events). Descriptions are present but generic (10-50 chars, below 194-char baseline). Parameter schemas visible but lack descriptions for complex types (event, changes objects in update/delete tools). No output schemas documented. Error handling returns raw exceptions without recovery guidance. calendar_update_events and calendar_delete_events accept untyped dict parameters with no field documentation, violating schema clarity rules. playback_controller accepts free-form action string instead of enum, inviting hallucinated values. No pagination, no result limits, no chaining IDs in responses.

• Replace free-form 'action' parameter in playback_controller with enum: action: Literal['play', 'pause', 'resume', 'skip', 'previous', 'queue']. Add description for each action.
• Refactor calendar_update_events and calendar_delete_events to accept typed parameters: event_id (string), and for update, a structured changes object with documented fields (summary, start_time, end_time, location, description, attendees).
• Document output schemas for all tools. E.g., calendar_read_events returns {events: [{id, summary, start, end, location}], total_count}. calendar_create_events returns {event_id, link}.
• Add recovery guidance to error responses. E.g., 'Event not found. Call calendar_read_events() to list available events.' instead of raw exception strings.
• Rename tools to follow verb_noun pattern: calendar_read_events → get_calendar_events; playback_controller → control_spotify_playback (or split into play_spotify, pause_spotify, skip_spotify).