Four tools with basic schemas and descriptions, but significant gaps in parameter documentation and output schema clarity. Tool names lack action verbs (echo, math.add, math.fibonacci, time.now are mostly nouns or generic). Descriptions are present but minimal (10-50 chars), below the 50-200 char baseline for LLM-optimized docs. Parameter descriptions exist but are terse. No visible output schema documentation. Error handling and recovery guidance absent. Naming convention inconsistent: 'echo' lacks verb; 'math.add' uses dot notation; 'time.now' is noun-based. No evidence of idempotency hints, destructive operation warnings, or permission gates.

• Rename tools with action verbs: 'echo' → 'return_echo', 'math.add' → 'compute_sum', 'math.fibonacci' → 'get_fibonacci_number', 'time.now' → 'get_current_time'. This helps LLMs parse intent from names alone.
• Expand descriptions to 50-200 chars. Example: 'compute_sum: Add two long integers and return their sum. Use for arithmetic operations. Returns {sum: long}. Fails if result overflows long range.'
• Document output schemas explicitly. For each tool, specify return type and fields: math.add returns {sum: long}, time.now returns {timestamp: string, timezone: string, formatted: string}.
• Add constraint details to parameter descriptions. Example: 'n (int): Fibonacci index, must be >= 0 and <= 100. Returns error if n < 0 or n > 100.' Include valid ranges and formats.
• Add error handling guidance. Example: 'time.now with invalid timezone returns error 'Invalid IANA timezone. Valid examples: UTC, America/New_York, Asia/Shanghai. Call list_timezones() to see all options.'