This is a multi-sample SDK demonstrating MCP patterns across 7 different example servers (datetime, dynamic, functions, longrunning, math, sdk, string). Overall definition quality is FAIR with noticeable gaps. Tool naming is generally verb-forward and clear (current_utc_time, add_days, add_tool, etc.). Descriptions exist for all 39 visible tools and are moderately detailed (average ~80-150 chars). Input schemas are present and properly typed with JSON Schema format. However, there are significant gaps: (1) No output schemas documented anywhere, the server definitions show input schemas only, not what these tools return; (2) Parameter descriptions are terse (often 20-50 chars) and lack constraint guidance (ranges, enums, formats); (3) Error handling strategies are not documented, there is no guidance on what errors are retryable or how LLMs should recover; (4) The dynamic tools (add_tool, add_function) allow arbitrary Python code execution with minimal validation, a critical security and control-flow risk. Math tools (tools 18-37) and datetime tools (1-8) are safe and well-defined, but the dynamic execution model undermines overall quality. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) are present despite the MCP spec supporting them since 2025.

• Document output schemas for all 39 tools. For each tool, add a 'Returns' section describing the structure, field types, and field meanings. Example: 'Returns: {"result": number, "unit": string}'.
• Immediately refactor add_tool and add_function to remove arbitrary code execution. Options: (1) Restrict to pre-validated code templates; (2) Use a restricted interpreter (e.g., RestrictedPython); (3) Move to a separate privileged endpoint with approval workflow. Code injection is not acceptable in production.
• Add parameter constraints to all numeric and string parameters. Specify min/max for integers, regex patterns for strings, and enum values for fixed sets. Example: 'progress_interval_seconds: integer, 1 - 3600 seconds'.
• Document error cases for each tool. Add a section: 'Errors: Returns ValueError if [condition], suggesting to [recovery action]'. Example for divide: 'Denominator cannot be zero. Use multiply with reciprocal instead.'
• Adopt MCP tool annotations. Add readOnlyHint=true to all READ_ONLY tools (current_utc_time, all math tools, etc.). Add destructiveHint=true and require confirmation for add_tool, add_function, call_function.
• Provide enum constraints instead of free-form strings. For convert_temperature, define from_unit and to_unit as enums: ["celsius", "fahrenheit", "kelvin"]. For get_sdk_methods, define entity_type as an enum of valid types.
• Add dependency hints to discovery tools. Example for get_functions: 'Call this first to see available functions before invoking call_function.'