Single tool 'create_note' has a proper schema with all required fields typed and described. However, the description is minimal (21 characters), lacking context about the tool's behavior, when to use it, or what happens to state. No error handling guidance, no idempotency notes, and parameter descriptions are generic. The tool follows basic naming conventions but lacks depth in documentation expected for production-grade agents. Output schema is implicit rather than explicitly documented, forcing LLMs to infer the response structure.

• Expand create_note description to 100-200 chars: 'Create a new note and store it in memory. Returns the created note ID. This tool mutates state; retry with identical inputs may create duplicates. Typical follow-up: read the note via note:///{id} URI.'
• Add explicit output schema documentation: 'Returns an object with fields: {id: string, title: string, message: string}' or model it in JSDoc.
• Add character/length constraints to parameters: 'title (1-256 chars, no newlines)', 'content (1-10000 chars)'.
• Add error handling guidance to description: 'Throws if title or content are empty; caller should validate input before retrying.'
• Document idempotency behavior: 'Warning: repeated calls with same input create separate notes. For idempotent upsert, call a separate tool first to check if note exists.'
• Validate input inside CallToolRequestSchema handler and return actionable error messages: 'Invalid title: must be 1-256 characters, got {length}' instead of generic string coercion.