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

There are no annotations, so the description carries full responsibility for behavioral disclosure. It only mentions 'Billing per call: 1 Credits.' and does not disclose output format, data scope, limitations, sorting, or any other runtime behavior.

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 but under-specified rather than appropriately concise. The phrase 'Top Websites / v2' is redundant with the title, and 'Group: Websites' gives no operational value. The only useful line is billing, which is metadata rather than functional guidance.

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 four optional parameters, no output schema, no annotations, and sibling tools with clear naming overlaps, the description is incomplete. It lacks any explanation of what top websites means, how filters combine, whether results are ranked, or what response will look like, making it far below the minimum viable context.

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 covers three of four parameters with meaningful descriptions (country, category, subcategory), and the trending parameter is missing only a description. The tool description itself adds no parameter information beyond what the schema already provides, so baseline schema coverage supports a 3.

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 is essentially a restatement of the title: 'Top Websites / v2'. It does not use a specific verb or explain what the tool does beyond the name, nor does it distinguish get_v2_top_websites from sibling tools like get_v3_top_websites or get_v2_top_engines.

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 usage context is provided. The description does not explain when to use this tool, how it differs from v3, which combinations of country/category/subcategory are valid, or when alternatives like get_v2_website_analytics would be more appropriate.

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