Single tool 'create-message' has a well-formed JSON Schema with proper enums and required fields, but lacks critical production-grade patterns. The tool description (56 chars) is minimal and does not explain WHEN to use it or what it returns. Parameter descriptions are present but generic. No output schema is documented, LLMs cannot predict the response structure. No error handling guidance. No idempotency hints despite being a read-only operation. The tool follows basic naming (verb_noun) but lacks the depth expected of production tools.

• Expand tool description to 100 - 200 characters: 'Generate a custom message (greeting, farewell, or thank-you) with a specified tone (formal, casual, or playful) addressed to a recipient. Returns a single text message.'
• Document the output schema in the tool definition: { type: 'object', properties: { content: { type: 'array', items: { type: 'object', properties: { type: { type: 'string', enum: ['text'] }, text: { type: 'string', description: 'The generated message' } } } } } }
• Add explicit error messages: 'Invalid messageType: got "X", must be one of: greeting, farewell, thank-you' and 'Invalid tone: got "X", must be one of: formal, casual, playful'
• Add idempotentHint: true to the tool definition since it is read-only and safe to retry
• Document the 'tone' parameter default in its description: 'Tone of the message (formal, casual, or playful). Defaults to casual if omitted.'