Single-tool server with Material Color Utilities. Tool has good naming (verb_noun pattern: 'generate_corepalette_colors'), complete input schema with regex validation, and clear description. However, output schema is not documented in source code, only inferred from test file. Parameter descriptions are present and reasonably clear. No error handling documentation, no resource composition patterns visible. This is a narrow, focused tool that does one thing well, but lacks the multi-tool design patterns and comprehensive documentation needed for higher scores.

• Document the output schema explicitly in the MCP server code. Example: 'Returns an object with six color fields: {primary: string, secondary: string, tertiary: string, neutral: string, neutralVariant: string, error: string}, each a hex color code.' This enables LLMs to know what to do with the result.
• Add error handling documentation to the tool description: 'If seedColor is invalid (not a valid hex code), returns an error with the specific constraint violation. Retry with a valid hex code. If CorePalette generation fails, check your Material Color Utilities library version.'
• Enhance the tool description to explain use cases and output: 'Generates a Material Design 3 color scheme from a seed color. Returns six core palette colors used to build accessible, harmonious themes for UI applications. Use this when building design systems or customizing Material Design interfaces.'
• In seedColor parameter description, replace the example-based guidance with format clarity: 'Hex color code, 6 or 8 digits with optional # prefix. Examples: FF0062, #FF0062, #FF0062FF. Must match pattern ^#?(?:[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$'
• Add a tool annotation (if using MCP 2026-07-28 or later) to declare this as READ_ONLY: mark with idempotentHint=true so agents know repeated calls with the same seed produce identical results and are safe to cache or parallelize.