Single tool 'add' with minimal but present definition. Tool naming is generic (lacks action verb clarity), description is extremely brief (17 chars), and parameter descriptions are adequate but sparse. No output schema documented. Input schema is visible with proper Zod validation but lacks richness. No error handling guidance, no composition patterns, and no security considerations evident.

• Rename tool from 'add' to 'add_numbers' to signal the action verb clearly and avoid ambiguity with other potential 'add_*' tools.
• Expand description to 80-150 characters: 'Add two numbers and return their sum. Use this for arithmetic computations. Accepts integers and decimals, returns numeric result.'
• Document output schema explicitly: 'Returns a JSON object with: { sum: number (the arithmetic sum) }' or document the actual MCP response structure in tool metadata.
• Enhance parameter descriptions with constraints: 'a': 'First number to add (integer or decimal, no limits)' and 'b': 'Second number to add (integer or decimal, no limits)'. Add constraint info if there are boundaries.
• Add error handling guidance to description: 'Returns error if inputs are non-numeric, null, or undefined. Non-finite values (Infinity, NaN) may produce unexpected results.'
• Consider if this is truly a production tool or a demo. For a real MCP server, provide domain-specific arithmetic tools (e.g., calculate_invoice_total, compute_discount) rather than generic add.