5 tools with verb-noun naming (load_preset, encode_share, load_share, violations, ascii_map). All have descriptions (10-150 chars, baseline 194). Input schemas present for all tools with proper types. However, descriptions are terse (e.g., 'Check the current room against design rules' lacks WHEN/WHY context). Parameter descriptions minimal or absent. No output schemas documented. No error handling guidance. No pagination, no result limits stated. Composition is reasonable (each tool does one thing), but descriptions lack LLM-optimization depth required for A-grade tools.

• Add output schema documentation for all tools. E.g., violations() should document: {errors: [{rule: string, message: string}], warnings: [...]}. ascii_map() should document: {grid: string[][], legend: {char: string, item: string}[]}.
• Expand parameter descriptions with format hints and constraints. E.g., load_preset: 'id (string, 1-50 chars, alphanumeric): The preset ID to load. Available presets: bedroom, kitchen, living_room.' load_share: 'hash (base64 string, max 5000 chars): Base64-encoded room layout from encodeShare().'
• Enhance tool descriptions with WHEN/WHY context. E.g., violations: 'Check the current room layout against design rules (furniture spacing, door clearance, sunlight). Call this after moving items to validate the layout before saving.'
• Add error handling guidance. E.g., load_share: 'Returns false if hash is invalid base64 or JSON is malformed. Ensure hash comes from encodeShare() output.'
• Consider adding a confirm_load_preset() or dry_run parameter to load_preset/load_share to prevent accidental state loss when resetting scenes.