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

The readOnlyHint annotation already establishes the safety profile, and the description adds useful behavioral context: the call is free, the result includes kit contents and the default standard_id, and the tag can be used in a prompt to override the default. It does not discuss pagination or error behavior, but it adds meaningful context beyond annotations.

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 front-loaded with the main action and scope, then adds the kit contents, default behavior, and tag usage in compact form. Every sentence contributes useful information without unnecessary repetition.

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?

For a simple read-only list tool with one fully documented parameter and annotations covering safety, this description is complete enough. It explains what is returned and how the returned tag can be used, compensating for the absence of an output schema.

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% for the single project_id parameter, so the schema already provides the necessary parameter semantics. The description only indirectly reinforces this by saying 'of this project,' without adding format or constraint details beyond the schema.

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 gives a specific verb and resource: list the style kits of this project. It also explains what a style kit contains and which one is the project default, though it does not explicitly distinguish itself from siblings such as lab_create_stil_kit or lab_stil_kit_standard.

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?

It implies usage by saying to write the returned @stil_ tag into an image or video prompt to override the default for one call, and notes that the operation is free. However, it does not explicitly say when to choose this tool over lab_create_stil_kit or lab_stil_kit_standard.

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