Two simple tools with basic schemas and descriptions, but significant quality gaps. Both tools have descriptions and input schemas visible in the source code (mcp/dice/src/index.ts and mcp/uuid/src/index.ts), but they are extremely minimal. The 'dice' tool has a description in Japanese ('サイコロを振った結果を返します' = 'Returns the result of rolling a die'), which is 24 chars, acceptable but terse. The 'uuid' tool has a similar brief description in Japanese ('UUID（バージョン4）を生成して返します' = 'Generate and return UUID v4'). Neither tool name starts with a clear action verb in the English context (though 'dice' is noun-like and 'uuid' is a noun). Neither tool description answers WHEN to use it or provides context beyond the raw action. Neither tool declares its output schema, LLMs must infer from the code that both return text-based results. The dice tool's 'sides' parameter has a description ('サイコロの面の数' = 'number of die faces') and type (number with min=1, default=6), which is better than many servers. The uuid tool has no parameters. No error handling guidance, no recovery hints. Output format is hardcoded in the implementation (returning {content: [{type: 'text', text: ...}]}) but never documented. Overall, these are toy tools with bare-minimum definitions.

• Rename 'dice' to 'roll_dice' and 'uuid' to 'generate_uuid' to signal action intent to LLMs.
• Expand descriptions to 50-150 characters in English: e.g., 'Roll a die with configurable number of sides (default 6) and return the result. Use this for simulating random outcomes.' and 'Generate a random UUID v4. Use this when you need a unique identifier for new records or requests.'
• Document output schema explicitly: 'Returns: {content: [{type: 'text', text: <result as string>}]}' or via OpenAPI/JSON Schema.
• Add parameter descriptions for 'sides': 'Number of sides on the die. Must be at least 1. Defaults to 6.' (already present but could be clearer).
• Add error handling guidance: 'If sides < 1, returns error: Invalid sides parameter. Minimum is 1.' and 'If UUID generation fails (rare), returns error: UUID generation failed.'
• Translate all descriptions and parameter documentation to English for global developer accessibility.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry