Single tool 'add' is present with basic schema and description. Naming follows verb_noun convention (good). Description is minimal but sufficient (24 chars). Input schema is properly typed with Zod and includes parameter descriptions. However, the tool is trivial (arithmetic operation), and there is no output schema documentation, no error handling guidance, and no security or composition considerations. The server exposes only one toy tool with no real-world utility patterns demonstrated.

• Add a documented output schema showing that 'add' returns a text field with the sum as a string. Example: 'Returns {"content": [{"type": "text", "text": "<sum>"}]}'
• Expand tool description from 'Adds two numbers together' to 'Adds two numbers together and returns the numeric sum. Use this when you need to perform basic arithmetic calculations. Returns the result as a text value.'
• Add explicit constraints to parameters: 'a' and 'b', e.g., 'a number, range [-1e10, 1e10]. Results are not rounded.' This prevents LLM from passing unreasonable values.
• Document error cases: 'If a or b cannot be parsed as a number, the operation fails. Ensure inputs are valid numbers before calling.'
• Consider if this tool should return a structured object {"sum": number, "operands": {"a": number, "b": number}} instead of a text string for easier downstream consumption.