StarSinger MCP has well-structured tool definitions with clear naming (verb_noun pattern), comprehensive descriptions (150-250 chars each), and proper Zod schemas with type constraints. All 5 tools are read-only and follow consistent patterns. However, output schemas are not formally documented, responses are text-only without structured field definitions. Parameter descriptions are good but lack actionable error guidance. No tool annotations (readOnlyHint) despite all being read-only. Missing pagination guidance for list-like tools (browse_artists, get_artist). Error handling is minimal, no recovery guidance or categorization.

• Document output schemas as structured objects. E.g., search_music returns {tracks: [{id, title, artist, genre, mood, audioUrl, coverUrl, lyricsPreview}], count}. This enables reliable field extraction for tool chaining.
• Add readOnlyHint: true to all tool definitions via server.tool() annotations. This signals to agents that these tools are safe to call without confirmation.
• Enhance error handling: catch API errors and return actionable messages. E.g., 'Track not found. Try search_music() to find tracks by name or mood.' Categorize errors as retryable (network timeout) vs user-fixable (invalid ID).
• For browse_artists and get_artist, add offset/cursor parameter and document pagination strategy. Return total_count and next_cursor in responses to enable multi-page discovery.
• Clarify get_artist parameter logic: 'Either artistId or handle required. If both provided, artistId takes precedence.' Or split into two tools: get_artist_by_id and get_artist_by_handle.