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

Annotations already declare readOnly, idempotent, and non-destructive behavior. The description simply says 'List', which is consistent but adds no additional context such as output format or pagination. It does not contradict annotations, but the description contributes little beyond what annotations already convey.

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 a single, direct sentence that communicates the core purpose without any filler. It is appropriately sized for a zero-parameter list operation.

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 low complexity (no parameters, simple list operation) and the presence of an output schema, the description is mostly sufficient. However, it is vague about what 'templates' are and could be confused with the many similar template-listing sibling tools without relying on the tool name. A brief note about being specific to AI Hair Volume would improve completeness.

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 tool has zero parameters, so the description does not need to explain parameter details. The baseline for no parameters is 4, and the description adequately avoids adding unnecessary parameter information.

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 'List predefined templates' clearly states the action (list) and resource (predefined templates). The tool name disambiguates it from sibling template tools, but the description itself does not explicitly distinguish which templates it lists, relying on the name for context.

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?

No guidance on when to use this tool versus the related 'AI-Hair-Volume-Virtual-Try-On' or other template-listing tools. There is no mention of prerequisites or whether this should be called before a try-on operation.

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