Basic MCP server with 3 READ_ONLY tools implemented via explicit server.registerTool() calls in src/index.ts. All tools have descriptions (194 char baseline met), proper Zod schemas with types, and descriptions for all parameters. However, naming lacks action verbs (echo, calc, now vs get_current_time, perform_arithmetic); descriptions are minimal (10-50 chars, below the 50-200 char LLM-optimized range); no output schema documentation; no error guidance beyond basic division-by-zero handling; output is generic text rather than structured typed responses. Tools are simple and readable but lack production-grade polish. No tool annotations (readOnlyHint exists but not used despite all tools being READ_ONLY). Parameter descriptions are present but terse.

• Rename tools with action verbs: 'echo' → 'repeat_text' or 'get_echo', 'calc' → 'perform_arithmetic' or 'calculate_math', 'now' → 'get_current_time'. Start all tool names with verbs (get_, perform_, retrieve_, etc.) matching the 90% baseline of A+ tools.
• Expand tool descriptions to 50 - 200 characters. Example for math/calc: 'Perform basic arithmetic operations (add, subtract, multiply, divide) on two numbers. Use for calculations. Returns numeric result with no unit conversion.' This answers what, when, and what it returns.
• Add tool annotations to tool metadata. In server.registerTool() call, add readOnlyHint: true to all three tools: server.registerTool('echo', { title: '...', description: '...', readOnlyHint: true, inputSchema: {...} }, ...).
• Document output schema. Define the expected response structure for each tool as JSON Schema. Example for clock/now: specify response contains { iso_8601: string, local_datetime: string, epoch_milliseconds: number }. Return typed objects instead of concatenated text strings.
• Add parameter constraints to descriptions. For echo, update description to: 'Repeat the input text exactly as provided (1 - 100 characters). Useful for testing connectivity.' For math/calc, specify: 'Second number must not be zero for division operations.'
• Implement structured error responses. Instead of returning text 'Error: Division by zero...', return a structured object with error code and recovery guidance: { error: 'DIVISION_BY_ZERO', message: 'Cannot divide by zero.', suggestion: 'Please provide a non-zero divisor.' }