Critical gaps across all dimensions. Tool descriptions are present but minimal (10-50 chars, well below the 194-char baseline). Input schemas exist but lack parameter descriptions entirely, every parameter is undescribed, violating the 100% A+ baseline. No output schemas documented. Parameters lack enums, ranges, and constraints. Error handling is absent. Security concerns: authenticate/logout tools expose OAuth flow without secret injection guidance. No tool annotations (readOnlyHint/destructiveHint). Naming is verb-forward but generic (e.g., 'play_audio', 'stream_audio_file' are similar and could confuse LLM selection). No composition guidance or chaining IDs in responses.

• Add 50 - 150 character descriptions to every parameter. Example: 'device_id (string): The Sonos device ID. Obtain from get_devices(). Required.' Currently zero parameter docs exist.
• Document output schemas for all tools. Example for get_devices: 'Returns {devices: [{id: string, name: string, status: "online"|"offline"}], total: number}'. LLMs need to know what fields to extract.
• Expand tool descriptions to 100 - 200 chars. Include: What does it do? When should I call it? What does it return? Example: 'Play audio from a URL on a Sonos device. Call after get_devices() to obtain device_id. Returns {status: "playing", device_id, url}. Fails if device offline or URL unreachable.'
• Add error recovery hints. Example for play_audio: 'If device_id is invalid, call get_devices() to list available devices. If URL is unreachable, verify the URL is publicly accessible and returns audio/mpeg or audio/wav.'
• Add parameter constraints. Example for set_volume: 'volume (number, 0 - 100): Volume level. Defaults to 50 if omitted.' Currently no ranges or defaults are specified.