Two tools with minimal descriptions and basic schemas. 'add' (9 chars) and 'calculate' (10 chars) descriptions are below the 20-char hard floor, triggering 0-20 scoring. Schemas present but lack depth, no parameter descriptions visible in the schema structure, only inline in Zod definitions. No error handling guidance, no output schema documentation, no tool annotations. Naming is acceptable (verb_noun pattern) but descriptions fail to explain WHEN to use each tool or what distinguishes them. The 'calculate' tool has an enum constraint (good), but no guidance on error cases like division by zero beyond a hardcoded string response.

• Expand 'add' description to 50 - 100 chars: 'Adds two numbers and returns the sum. Use when you need basic arithmetic addition.'
• Expand 'calculate' description to 80 - 150 chars: 'Performs arithmetic operations (add, subtract, multiply, divide) on two numbers. Returns the result or an error if division by zero is attempted.'
• Add parameter descriptions in Zod schema: { a: z.number().describe('First operand'), b: z.number().describe('Second operand'), operation: z.enum([...]).describe('Arithmetic operation: add, subtract, multiply, or divide') }
• Document output schema in tool registration: 'Returns { content: [{ type: "text", text: string }] } where text is the numeric result or error message.'
• Improve error handling for division by zero: return structured error with recovery hint, e.g., 'Cannot divide by zero. Ensure the second operand (b) is non-zero.'