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

Annotations already mark this as a non-read-only, non-destructive, idempotent write. The description adds concrete context: empty lists clear the selection, existing work remains in history, and stale revisions or active work refuse safely, which substantially exceeds what the annotations alone provide.

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?

Three tight sentences with no filler. The core action is front-loaded, followed by edge-case behavior and safety semantics in a logical order.

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 annotations, output schema, and schema-provided parameter descriptions, the description covers the critical behavioral cases an agent needs: clearing, history preservation, and revision conflict. It could mention ownership or permission context, but the schema already states the project must be owned.

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 coverage is 67%. The description restates constraints already encoded in the schema for creatorPalette (0–5, unique, uppercase #RRGGBB) and adds the useful behavioral note that an empty list clears the selection, but it does not explain projectId semantics or add meaning beyond the schema for expectedRevision.

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: save project colours as creative direction, with 0–5 #RRGGBB values. It is clearly a palette-write tool rather than a generic project mutation, but it does not explicitly distinguish itself from sibling colour/selection tools like studio_artist_voice_choose or studio_artist_ready_made_choose.

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 explains what happens on an empty list, a stale revision, and active work, but never says when an agent should choose this tool over alternatives or what prerequisite conditions select it. Those are behavioral facts, not usage guidance.

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