set_color_brightness

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

With no annotations, the description must cover behavioral traits. It explains 'iswhite' mode but fails to disclose how device selection works (e.g., if both idx and name are null, does it fail?), side effects, or permissions. This leaves significant ambiguity.

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 is concise with a clear purpose sentence upfront followed by parameter list. It avoids unnecessary text, though the parameter descriptions could be more streamlined.

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?

Given the complexity (5 parameters, device selection ambiguity) and no annotations, the description fails to adequately explain device identification logic. An output schema exists, so return values are covered, but operational context is lacking.

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?

Schema description coverage is 0%, so the description adds necessary meaning: ranges for hue (0-360) and brightness (0-100), and explanations for idx, name, and iswhite. However, it does not clarify how idx and name relate or if one is required, providing only partial compensation.

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 clearly states 'Set color and brightness for an RGB light,' providing a specific verb and resource. It effectively distinguishes this tool from siblings like set_color_temperature and set_dimmer_level.

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 description does not explicitly state when to use this tool versus alternatives like set_color_temperature or set_switch_state. The context is implied by the name and description, but no exclusions or alternative recommendations are provided.

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