set_group_action

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states that lights are controlled simultaneously, but it does not disclose side effects, prerequisites such as the group existing, whether unspecified parameters are left unchanged, permission requirements, or how invalid combinations of color parameters behave.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description opens with a one-sentence purpose and then provides a tight, well-organized Args list. All 11 parameters are covered without redundant prose or filler, and the structure makes the parameter semantics easy to scan.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The parameter documentation is thorough and an output schema exists, so return values do not need explanation. However, the description omits important operational context: it does not state that at least one state parameter is typically needed beyond group_id, nor does it explain mutual exclusivity or fallback behavior when combining color fields, transition details, or scene recall.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 0% description coverage and no enums, but the description fully compensates: every parameter is explained with ranges, units, types, or allowed values. Examples include brightness 1–254, hue 0–65535, color_temp in mireds 153–500, transition_time in tenths of a second, and alert/effect enum values.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb and resource: "Control all lights in a group simultaneously." This clearly distinguishes the tool from siblings like set_light_state, which targets individual lights, and from group-management tools like create_group or modify_group.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The phrase "all lights in a group simultaneously" implies the intended use case, but the description never explicitly states when to prefer this over set_light_state or other sibling tools. There are no exclusions or alternative routing cues, so usage guidance is only implied rather than explicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.