Single tool with empty input schema ({}), minimal description (47 chars), and no parameter documentation. Tool definition is visible in src/index.ts via server.tool() registration. Description lacks WHAT/WHEN/WHY context required for LLM selection. No output schema documented. Error handling returns unstructured text rather than actionable recovery guidance. Naming is acceptable (verb_noun: playCompletionSound) but tool is too simple to demonstrate composition patterns.

• Add input parameters: sound_file (enum: 'completion'|'error'|'success', default 'completion'), volume (0-100, default 80), timeout_ms (1000-10000, default 2000). Each parameter must have a description explaining its purpose and constraints.
• Expand description to 100-150 chars: 'Play a notification sound on Windows to signal code generation completion. Useful for audio feedback during long operations. Returns success/failure status. Requires Windows Media Player.'
• Document output schema explicitly: {success: boolean, message: string, duration_ms: number}. Include this in tool registration or as a comment.
• Enhance error handling with recovery guidance: 'Sound file not found at <path>. Ensure sounds/completion.mp3 exists. Verify Windows Media Player is installed.' Return structured error: {success: false, error_code: 'FILE_NOT_FOUND', message: '...', recovery_hint: '...'}
• Add platform detection and graceful fallback: detect non-Windows OS and return {success: false, message: 'This tool requires Windows. Consider using a cross-platform audio library or skipping sound on this platform.', recovery_hint: 'Install on Windows or use a different notification method.'}