This server has well-structured tool registration with consistent naming conventions (verb_noun pattern), but suffers from critical gaps in schema documentation, parameter descriptions, and output specification. All 20 tools follow a clear naming pattern (light_*, group_*, list_*, etc.), which is a strength. However, the source code provided does not show complete input schemas for parameters, we see parameter names and basic type hints in main.go, but crucial schema details are missing from the visible code. The descriptions are minimal (avg ~20-40 chars) and lack actionable guidance for LLM selection. Most critically: (1) output schemas are completely undocumented, we have no visibility into what these tools return, (2) error handling is invisible, (3) no descriptions explain WHEN to use each tool or WHY it differs from related tools, (4) parameter constraints (ranges, enums, formats) are absent from descriptions. The 'group_brightness' tool has a malformed input schema in the spec (group_id parameter is described as 'Brightness percentage (0-100)', copy-paste error). Tools like 'light_effect' and 'group_effect' lack enum constraints on the 'effect' parameter, inviting hallucination. The server appears to be a functional CLI wrapper around the Hue API, but the tool interface has not been optimized for LLM usability per the 54 patterns.

• Document output schemas for all 20 tools. Specify the JSON structure, field names, types, and required/optional status. Example: 'Returns: {"id": string, "name": string, "brightness": number (0-100), "state": "on"|"off", "color": string (hex code)}'
• Add min/max constraints to numeric parameters. For 'brightness', document '0-100 (required, integer)'. For 'duration', document the valid range (e.g., '0-3600 seconds; 0 = infinite').
• Convert free-form 'effect' and 'color' parameters to enums or documented patterns. E.g., 'effect must be one of: colorloop, alert, pulse, ...' or 'color as 6-digit hex code (e.g., #FF0000) or name from list_colors tool'.
• Expand tool descriptions to 50-150 characters. Example: 'Turn a light on. Use this for individual lights; for multiple lights in a room/group, use group_on. Returns immediately; light state updates within 1 second.'
• Add per-tool error guidance. Example for light_on: 'Fails if light_id does not exist (try list_lights first) or bridge is unreachable (network issue). Returns error with available light IDs to enable self-correction.'
• Fix group_brightness schema: add missing 'brightness' parameter with type number and description. Remove the erroneous description from 'group_id'.
• Add pagination/limit parameters to list_* tools. Example: 'list_lights(limit: 50, offset: 0) Returns: {total: number, items: [{id, name, ...}], next_cursor: string|null}'
• Clarify the relationship between groups, rooms, and zones in descriptions. Add a discovery tool (e.g., get_structure or describe_locations) that explains these concepts, or consolidate overlapping list_* tools.