Server has 4 tools with clear verb-noun naming (get_*, capture_*, preview_*). All tools have descriptions (avg 180 chars, within baseline 194). Input schemas present for 3/4 tools using Zod with type constraints and descriptions. Parameter descriptions are present but terse (avg 45 chars vs baseline 72). Output schemas are not documented, LLMs cannot predict response structure. Error handling is minimal; no recovery guidance or categorization. Security concern: preview_file is WRITE-capable but lacks confirmation/dry-run pattern. No tool annotations (readOnlyHint/destructiveHint). Composition is sound, tools are single-purpose and chainable.

• Example: `inputSchema: { type: 'object', properties: {}, required: [] }`
• Document output schemas for all tools. Example for capture_screen: `{ type: 'object', properties: { data: { type: 'string', description: 'Base64-encoded image' }, mimeType: { type: 'string', enum: ['image/png', 'image/jpeg'] } } }`
• Add tool annotations via MCP SDK. Example: `server.registerTool('capture_screen', { ..., readOnlyHint: true })` and `preview_file` with `destructiveHint: true`
• Enhance error messages with recovery guidance. Example: 'Screen Recording permission denied. Enable in System Preferences > Security & Privacy > Screen Recording, then retry.'
• Add confirmation step for preview_file. Example: return `{ content: [{ type: 'text', text: 'Ready to open file. Confirm? (This may trigger downloads or execute scripts.)' }] }` and require explicit confirmation parameter.