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

With no annotations, the description carries the burden. It discloses that the tool is free, returns aggregated demand data sorted by most-requested first, and covers underserved categories. It does not mention authentication, rate limits, data freshness, or output structure, but for a simple read-only report it provides reasonable 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 short and front-loaded with the most important fact: it is free. The second sentence covers content and use case. Minor redundancy exists because the title already says '(free)' and the description repeats 'FREE, no payment,' but overall it is efficient.

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 report tool with one optional parameter and no output schema, the description gives enough context: what the report contains, how it is ordered, and when to use it. It does not detail the exact output format, but the description provides a workable mental model for an agent.

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 single optional parameter 'days' is already fully documented in the schema with default and maximum. The description adds no additional parameter-level meaning, which is acceptable given the baseline of 3 for full schema coverage.

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 clearly states what the tool provides: an aggregate of what agents are looking for, most-requested first, including categories with no current supply. The title reinforces this as a free demand report. It is not as explicit as naming a distinct sibling, but it is unambiguous enough to be understood.

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 a concrete use case: "Useful if you are deciding what to build or sell into the agent economy." This clearly signals when to use the tool, though it does not explicitly mention when not to use it or name an alternative sibling.

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