Single tool with minimal definition quality. GetUsersPlaylists has a basic description (47 chars, within range) but critically lacks parameter descriptions, the userId parameter has no guidance on format or constraints. Input schema is present but incomplete: no type validation, no format hints, no enum constraints. Output is unstructured JSON string with no documented schema. No error handling guidance for LLMs (McpException thrown but not actionable). Tool does one thing (good composition) but lacks the rigor expected of production tools. Baseline: 194 chars avg description, 72 chars avg param annotation; this tool has 47 chars description and 0 chars param annotation.

• Add parameter description: userId should explain format (e.g., 'The Spotify user ID (e.g., spotify_user_123 or a username). Call search_users() first if you only have a display name.').
• Document output schema: 'Returns an array of playlist objects, each with: id (string), name (string), owner (object with id, display_name), total_tracks (integer), external_urls (object). See Spotify API docs for full schema.'
• Add pagination: Accept limit (1-50, default 20) and offset parameters. Return {playlists: [...], total: N, offset: M, limit: L} instead of raw JSON string.
• Improve error messages: Instead of 'No playlists found for user X', return 'User X has no public playlists. Verify the user ID is correct or try a different user.'
• Rename tool to 'get_user_playlists' (snake_case) to match LLM naming conventions and improve discoverability.

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

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