Single tool '新增标高' (add_level) has critical definition gaps. Tool name is in Chinese and lacks English verb prefix (should be 'create_level' or 'add_level'). Description is bilingual but adequate (~120 chars). Input schema present with 'offset' parameter (double type, 3000mm default), but parameter description is minimal and lacks validation bounds. No output schema documented, response structure unknown to LLM. No error handling guidance. Tool performs a WRITE operation (creates Revit level) but lacks idempotent/destructive annotations. Overall definition quality is below baseline for production use.

• Rename tool to 'create_level' (English, verb-first) and add Chinese alias in description if needed.
• Document output schema: return {level_id, level_name, elevation_feet, elevation_mm, created_at} so LLM knows what fields to extract.
• Add bounds to 'offset' parameter: 'offset (double, 100 - 10000 mm, default 3000), elevation offset from highest level'.
• Wrap exception handling: catch InvalidOperationException and return structured error: {error: 'no_levels_found', message: 'No levels exist. Create a base level first.', recovery: 'Call create_base_level tool'}.
• Add tool annotation: mark as destructiveHint=true and idempotentHint=false so agent knows retries risk duplicates.