Two tools with minimal descriptions and basic schemas. 'add' (9 chars) and 'calculate' (10 chars) descriptions are far below the 50-200 char baseline for LLM-optimized tools. Both tools lack output schema documentation. Parameter descriptions are present but generic. No error handling guidance, no idempotency hints, no recovery paths. Tool composition is reasonable (add vs calculate separation), but descriptions do not explain WHEN to use each tool or what distinguishes them.

• Expand 'add' description to ~80 chars: 'Adds two numbers together. Use this for simple two-operand addition. Returns the numeric sum.'
• Expand 'calculate' description to ~120 chars: 'Performs arithmetic operations (add, subtract, multiply, divide) on two operands. Use this for complex calculations or when operation type is dynamic. Handles divide-by-zero gracefully.'
• Document output schema: both tools return {type: 'text', text: string} where text is the numeric result or error message. Specify that 'calculate' may return error strings on invalid input.
• Add numeric range constraints to parameter descriptions: 'a and b: numeric values (integers or decimals, no range limit)' or specify if there are practical bounds.
• Add tool annotations to schema: mark both tools with readOnlyHint=true and idempotentHint=true so agents know they are safe to retry.