Three simple tools with complete schemas and basic descriptions. All tools have proper JSON Schema with typed parameters and descriptions. However, descriptions are minimal (10-34 chars, well below the 194-char baseline), lack context on WHEN to use each tool, and provide no error guidance. No output schemas documented. Tools lack verb-noun naming clarity (echo, add, multiply are acceptable but generic). No parameter constraints (enums, ranges). Error handling is absent, the code raises ValueError but provides no recovery guidance. This is a functional but minimal implementation typical of tutorial/demo servers.

• Expand tool descriptions to 100-200 chars. Example: 'add: Computes the sum of two numbers. Use when you need arithmetic results. Returns the numeric sum as text. Parameters: a (number), b (number). Both required.'
• Document output schemas. Define what each tool returns: 'Returns {type: string, content: string}' or similar. This lets LLMs parse responses reliably.
• Add parameter constraints. For add/multiply: 'a (number, range: -1e6 to 1e6)', 'b (number, range: -1e6 to 1e6)'. For echo: 'message (string, max 1000 chars)'.
• Implement error handling with recovery guidance. Replace ValueError with: 'Unknown tool: {name}. Available tools: echo, add, multiply. Did you mean one of these?'
• Rename tools for clarity. Consider 'compute_sum' instead of 'add', 'compute_product' instead of 'multiply', 'echo_message' instead of 'echo'.