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This server has 2 tools with adequate naming (verb_noun convention) and present input schemas, but falls short on description quality and output documentation. Both tools have reasonable descriptions (100-150 chars) that explain WHAT they do, but lack depth on WHEN to use them or error recovery guidance. Input schemas are well-formed with types and parameter descriptions present. However, output schemas are not documented, the tools return plain strings, and there is no specification of what format or content the caller should expect. No error categorization (retryable vs. user-fixable vs. fatal), no permission gating, no audit logging, and no tool annotations (readOnlyHint, destructiveHint, idempotentHint). The second tool includes some error handling in code (ValueError for invalid formats, empty lists) but does not expose recovery guidance in the description. No acknowledgment of parameter constraints (e.g., hex format validation details) in descriptions, these are only enforced in code. Overall: competent but minimal.
Find the nearest color from a predefined set of colors. Args: color (str): The color to find the nearest match for, in hex format (e.g., "#FF0000"). Returns: str: The nearest color from the predefined set (hex value).
Find the nearest color from a provided list of hex colors. Args: color (str): The color to find the nearest match for, in hex format (e.g., "#FF0000"). predefined_hex_colors (list[str]): List of hex colors to search from (e.g., ["#FF0000", "#00FF00"]). Returns: str: The nearest color from the provided list (hex value). Raises: ValueError: If color format is invalid or predefined colors list is empty
Output schemas not documented. Both tools return plain strings, but the calling agent cannot predict exact format, available values, or error responses without reading source code.
No tool annotations (readOnlyHint, destructiveHint, idempotentHint). Both tools are READ_ONLY and idempotent (same input → same output), but these hints are not declared in the schema or description, forcing LLMs to infer them.
Error handling lacks recovery guidance. The second tool's docstring mentions 'Raises: ValueError' but does not provide examples or suggest next steps. Code validates hex format and list emptiness, but error messages are not documented in the tool description, leaving LLMs without actionable recovery paths.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | D | 55 | 2026-07-28+ | v2 |
| 2026-03-09 | F | 0 | - | v1 |
Parameter constraints buried in code, not in descriptions. The color parameter requires '#RRGGBB' format, hex digits only, but the description says only 'in hex format (e.g., "#FF0000")'. No regex pattern or explicit format rule in the description text that an LLM can parse without executing the tool.