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

With no annotations, the description carries full responsibility for behavioral disclosure. It merely defines 'product structure' as 'mobile or fixed' but does not explain what the tool does, what it returns, or any side effects. This is a severe lack of transparency.

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 extremely short, but this is under-specification rather than effective conciseness. A single fragment 'Product structure: mobile or fixed' does not provide enough substance to be considered well-structured. It is not front-loaded with useful information.

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 absence of an output schema and the simple parameter schema, the description must explain what the tool returns. It only hints at a classification ('mobile or fixed') but leaves out key details such as the format of results, whether it lists all structures, and how filtering works. The description is insufficient for an agent to use the tool correctly.

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 schema descriptions for 'search' and 'includeEmpty' are complete (100% coverage), so the baseline is 3. The description adds no additional meaning about how these parameters relate to 'mobile or fixed', but it does not contradict the schema. Thus it neither helps nor harms parameter understanding.

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 'Product structure: mobile or fixed' is a noun phrase without an explicit verb. It does not clearly state that the tool retrieves or lists structures, making the purpose vague. It also does not distinguish itself from sibling tools like getProductTypes or getSectors.

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 is provided about when to use this tool versus alternatives. There is no mention of context, prerequisites, or exclusions. The description gives no indication of the intended use case.

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