Two tools with minimal descriptions and basic schemas. 'add' (9 chars) and 'calculate' (9 chars) descriptions are far below the 50-200 char baseline for LLM-optimized tools. Both tools lack parameter descriptions entirely, critical gap per pattern:tool-description. Schemas are present but sparse. No error handling guidance, no output schema documentation, no composition hints. Tools are trivial arithmetic operations with no real-world complexity, limiting assessment depth.

• Expand tool descriptions to 50-200 chars. Example: 'add' → 'Adds two numbers and returns their sum. Use when you need basic arithmetic addition. Returns a single numeric result.'
• Add descriptions to every parameter. Example: 'a': 'First number to add (any real number)', 'b': 'Second number to add (any real number)'.
• Document output schema explicitly. Declare that both tools return {content: [{type: 'text', text: string}]} and explain what the text field contains.
• Add error classification to 'calculate'. When division by zero occurs, return structured error: {error: 'INVALID_INPUT', message: 'Cannot divide by zero', retryable: false}.
• Rename tools for clarity: 'add' → 'add_numbers', 'calculate' → 'perform_arithmetic'. Include operation enum values in description: 'Performs arithmetic: add, subtract, multiply, divide.'