Server defines 7 time-related tools with reasonable naming (verb_noun pattern) and descriptions. All tools have input schemas with type definitions and parameter descriptions. However, output schemas are not formally documented, responses are inferred from code. Error handling exists but lacks recovery guidance. Descriptions are adequate (100-200 chars) but could be more LLM-optimized. No tool annotations (readOnlyHint, etc.) despite all tools being read-only. Parameter descriptions are present but some lack format/constraint details (e.g., timezone parameter accepts any string without validation hints).

• Add readOnlyHint annotation to all 7 tools via FastMCP's tool decorator to signal safety to LLMs.
• Formalize output schemas in tool docstrings. E.g., 'Returns: {seconds: float, formatted: str, is_negative: bool, requested_unit?: float, error?: str}'.
• Standardize error responses: always return structured dicts with 'error' and 'error_code' keys, never plain strings. Enables consistent LLM error handling.
• Add regex pattern or enum constraint to timezone parameter in schema (if FastMCP supports it) or document valid timezone format more explicitly in description.
• Document timestamp format as a JSON Schema pattern constraint (e.g., pattern: '^\d{4}-\d{2}-\d{2}(\s\d{2}:\d{2}:\d{2})?$') rather than relying on prose description.