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

The annotation only declares readOnlyHint=true, so the description bears responsibility for explaining behavior. It goes well beyond that by revealing that the result carries rendered palette and downloadable assets, that archive anchors must not be presented as recommended colours, and that proceeding to an own final palette requires palette_finalize. This is rich, honest behavioral context.

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 compact and every sentence earns its place: first the core function and outputs, second the customer-facing deliverables, third the two critical behavioural guardrails. It is front-loaded with the most important information and contains no filler.

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 that an output schema exists and annotations cover the read-only nature, the description covers the essential usage workflow, including customer presentation and the palette_finalize handoff. It is slightly incomplete in not clarifying how palette_specify relates to the sibling interior_specify or house_specify tools, but it is otherwise sufficient for correct invocation.

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 100%, so the parameters already have adequate documentation. The description adds the key constraint that the tool takes 2-8 hex values, which reinforces the 'colours' parameter, but it adds no additional meaning for 'style' or 'room_type' beyond what the schema already provides.

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 opens with a specific verb and resource: 'Generate a complete interior specification from 2-8 hex values.' It clearly differentiates itself from generic palette generation tools by naming concrete outputs like surface assignments, 60-30-10 proportions, and lighting behaviour. However, it does not explicitly distinguish itself from closely related siblings such as interior_specify or house_specify.

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 gives clear operational guidance: show the embedded downloads to the customer, never present archive anchors as recommendations, and call palette_finalize if choosing an own final palette. This effectively routes a key alternative use case. It does not, however, explicitly state when to choose this tool over other specification or palette tools.

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