Two tools with basic schemas and minimal descriptions. Both tools have input schemas with proper types (number, string, enum), but descriptions are extremely short (10-50 chars) and lack context for LLM selection. No output schema documentation. No error handling guidance beyond a single divide-by-zero check. Tool names are verb-based but generic. Schemas present but descriptions fall well below the 50-200 char baseline for A+ tools.

• Expand 'add' description to ~100 chars: 'Adds two numbers and returns the sum. Use this for simple arithmetic operations. Returns a numeric result as text.'
• Expand 'calculate' description to ~150 chars: 'Performs arithmetic operations (add, subtract, multiply, divide) on two numbers. Supports four operations via the operation enum. Returns numeric result or error message for division by zero.'
• Document output schema: both tools return {type: 'text', text: string}. Specify that 'add' returns a number as string, 'calculate' returns a number or error message.
• Add parameter constraints: specify that 'a' and 'b' accept any finite number (no Infinity/NaN). For 'calculate', document that divide by zero returns an error string, not a numeric result.
• Add tool annotations to schema: mark both tools with readOnlyHint=true and idempotentHint=true to signal to LLMs that they are safe to retry and do not modify state.