set_color

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

Annotations already declare that this is a mutating, idempotent, non-destructive operation, so the description has a lower burden. It adds little beyond those annotations and does not clarify behavioral questions such as precedence between hex and hue/saturation or whether unspecified parameters retain current values.

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?

A single front-loaded sentence with no wasted wording. The primary action comes first, followed by the two supported colour specification modes.

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 existence of an output schema and safety annotations removes the need to explain return values or basic mutation safety. Still, an agent would benefit from knowing how hex and hue/saturation interact, whether brightness is affected, and what defaults apply when no parameters are supplied.

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 schema already documents three of four parameters with ranges and examples, giving a baseline of 3. The description usefully frames hex as an alternative to hue and saturation, but it omits the optional brightness parameter and does not explain parameter interaction rules beyond the basic either/or.

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?

States a specific verb and resource: setting a coloured light. It also distinguishes the two main input modes (hue/saturation vs #RRGGBB), though it does not explicitly contrast with siblings like set_white or set_brightness.

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?

Usage is implied: use this for coloured light rather than white or brightness. However, it gives no explicit guidance on when to prefer hex over hue/saturation, what happens if both are supplied, or how it relates to siblings such as set_effect.

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