This is a reference implementation of the A2A protocol, not an MCP server. The 6 tools have minimal descriptions (10-30 chars, well below the 50-200 char baseline for LLM-optimized descriptions). Input schemas are present but extremely sparse: most tools accept a generic 'message' object with no field-level type information. The 'read_file' tool is the only one with a properly typed parameter ('path': string). No output schemas are documented. Error handling is absent from all tool definitions. Tool names lack clear action verbs (e.g., 'solve-and-format' violates single-responsibility principle). This implementation prioritizes protocol demonstration over production-grade tool quality.

• Expand each tool description to 50-200 characters. Include WHAT it does, WHEN to use it, and any prerequisites. Example: 'Echo a message back to the user. Use this to test agent communication and verify message formatting. Accepts a message object with text parts.'
• Document input schemas fully. For 'message' parameters, specify the structure: {text: string, parts?: array}. Add type, description, and constraints to every field.
• Add output schemas to all tools. Document what fields are returned, their types, and what downstream tools can use them for.
• Split 'solve-and-format' into 'calculate' (math only) and 'format_text' (formatting only). This enables agents to compose them independently.
• Add error handling guidance. Example: 'If calculation fails due to invalid syntax, return error with the invalid expression and suggest using parentheses for clarity.'