Single tool 'calculate' has a basic description (47 chars) and minimal parameter documentation. Input schema is present with type and description for the 'expression' parameter, but lacks constraints (no length limits, format validation, or examples of valid expressions). No output schema is documented, LLMs cannot predict the structure of results. No error handling guidance; invalid expressions will likely produce cryptic Python errors. Tool naming is acceptable (verb_noun), but the description does not explain when to use this tool vs. alternatives, what formats are accepted, or what the output looks like. No pagination, no batching, no composition hints. Baseline: avg tool description 194 chars (this is 47); avg params per tool 4 (this has 1). The server is functional but minimal.

• Expand tool description to 100 - 200 characters. Include: 'Evaluates mathematical expressions with support for basic operators (+, -, *, /, ^, %), functions (sin, cos, sqrt, etc.), and constants (pi, e). Returns the numeric result as a string. Use for arithmetic, trigonometry, and scientific calculations.'
• Add constraints to the 'expression' parameter: max length 500 chars, pattern to reject dangerous constructs, and examples of valid input ('2 + 2', 'sin(pi/2)', 'sqrt(16)').
• Document the output schema: 'Returns a string representation of the numeric result. Examples: "4", "1.0", "1.5707963267948966" (for pi/2).'
• Wrap the evaluate() function in try-except to catch ValueError, ZeroDivisionError, and other exceptions. Return structured error responses: '{"error": "Division by zero", "suggestion": "Check the denominator is not zero"}' instead of raw Python tracebacks.
• Migrate from STDIO to HTTP+SSE or Streamable HTTP transport to enable remote access and hosted client compatibility.