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

With no annotations, the description carries the behavioral disclosure burden. It does state the input range and that three hues are returned 120 degrees apart, which conveys the core behavior. However, it omits how out-of-range hues are handled, the exact formatting of returned hues, and the fact that the schema rejects any hue argument.

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 sentence with no redundancy. It front-loads the tool's purpose and packs the input constraint and output relationship into a compact, readable form.

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 description explains the algorithm and output conceptually, but the fundamental mismatch between the described hue input and the empty schema leaves the agent unable to invoke the tool. With no output schema and no parameter schema, this gap is critical rather than minor.

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 is empty (0 parameters), yet the description instructs the caller to 'Provide hue (0-360)'. Rather than adding useful meaning beyond the schema, this creates a false parameter that the schema will not accept, making the tool effectively uncallable as documented.

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 the verb ('Generate'), the resource ('a triadic (3-color) color harmony'), and the defining algorithm ('three hues 120 degrees apart'). This precisely distinguishes it from sibling harmony tools like analogous, complementary, monochromatic, and tetradic, even without seeing their descriptions.

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 provides no guidance on when to prefer this tool over the many other color-harmony siblings. More importantly, its only actionable instruction—'Provide hue (0-360)'—is misleading because the input schema defines zero properties, so an agent following the description cannot successfully pass a hue.

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