WeMCP has a single tool 'multiply' with minimal definition quality. The tool has a basic description (18 characters: 'Multiplies two numbers together.'), which falls short of the 10-1024 character guideline and lacks operational context. Input schema is present with typed parameters (a: float, b: float) and parameter descriptions, but the output schema is not documented. The tool name follows verb_noun convention (multiply is clear), but lacks context about when/why to use it. No error handling guidance is provided. The tool appears in a test file rather than being part of a formal server definition, raising questions about whether this is the actual production tool or merely an example. The server implements only 1 tool total, which is extremely limited for a general-purpose agent platform. Prompts and resources are declared but tool definition depth is poor.

• Expand tool description to 50-200 characters. Example: 'Multiplies two floating-point numbers and returns their product. Useful for calculations and numeric transformations. Input: two floats (a, b). Output: a * b (float). Returns error if result overflows or inputs are NaN.'
• Document the output schema explicitly. Add to tool definition: 'Output: { result: float, inputs: { a: float, b: float }, precision_loss: bool }'
• Add parameter validation documentation. For 'a' and 'b', specify: 'Floating-point number. Range: -1e308 to 1e308. Special values (NaN, Inf) will return an error.'
• Add error handling guidance. Include in description or separate error schema: 'Returns error if multiplication would overflow (result > 1e308) or if inputs are NaN/Inf. Caller should check for overflow before passing very large numbers.'
• Move tool definition out of test file into explicit server registration (e.g., app.py or server.py with @fastmcp.tool decorator and full schema). Current location suggests it's a test example, not production.
• Add use-case context. Clarify when an agent should use multiply vs. other numeric operations. Example: 'Use for simple two-operand multiplication. For complex expressions, prefer a calculator tool that can handle order of operations.'
• Implement batch/array variants or related tools (add, subtract, divide) to enable richer agent workflows. A single multiply tool is insufficient for most agent tasks.