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Single tool with basic schema and minimal description. Tool name 'control_light_by_rgb' is action-oriented but lacks verb prefix (should be 'set_light_color_by_rgb'). Description is 44 chars, acceptable but generic, missing WHEN to use and WHAT it returns. Input schema is present with proper types (integer for RGB/kelvin) and defaults, but parameters lack individual descriptions entirely. No output schema documented. Error handling returns plain text without recovery guidance. No parameter constraints (RGB 0-255 validated in code, not schema). Missing tool annotations (destructiveHint for WRITE operation). Overall structure is functional but falls short of production quality.
Set LIFX bulb color based on RGB values
Tool name lacks action verb prefix. 'control_light_by_rgb' should be 'set_light_color_by_rgb' or 'set_light_rgb' to match verb_noun convention and improve LLM intent parsing.
Tool description is 44 characters, too brief. Missing WHAT it does (sets bulb color), WHEN to use it (when user wants to change light color), and WHAT it returns (confirmation or error). Should be 100-200 chars.
Input parameters (red, green, blue, kelvin) have no descriptions. LLM cannot infer that RGB values are 0-255 or that kelvin is color temperature. Each parameter must have a description explaining its purpose and constraints.
No output schema documented. LLM does not know what fields to expect in the response (success message, error details, etc.). Must document return type structure.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | F | 41 | 2026-07-28+ | v2 |
Tool marked as WRITE risk but lacks destructiveHint annotation. Error handling returns plain text ('Error occurred: ...') without recovery guidance. LLM cannot determine if error is retryable or user-fixable.