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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does add useful information about the cost ($0.09 via x402) and the live nature of the data, but it omits details such as response structure, pagination, error handling, or authentication requirements beyond payment.

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 sentence that packs key information: pricing, payment method, content delivered, and data freshness. Every word contributes to the core purpose, with no redundancy or fluff.

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?

The tool is simple (2 params, no output schema), and the description largely explains the core function and output fields. However, it doesn't describe the response format, how many stories are returned (the 'top' parameter), or what x_payment entails, leaving gaps for an agent to invoke it 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 covers only 'top' (1-20) and leaves 'x_payment' undocumented. The description mentions 'via x402' but never explicitly connects this to the x_payment parameter, nor does it explain how to provide it. With 50% schema coverage, the description should compensate but fails to clarify the payment parameter semantics.

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 indicates the resource (Hacker News top stories) and output contents (score, author, comment count, links), making the tool's function easy to identify. However, it lacks an explicit verb like 'get' or 'list', so it doesn't fully meet the 'specific verb+resource' criterion; it is still distinguishable from all sibling tools.

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?

Usage context is only implied by the resource name and description; there is no explicit guidance on when to use this tool versus alternatives. Since there are no closely related sibling tools, the lack of explicit alternatives isn't a major issue, but the description still doesn't state scenarios or exclusions.

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