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

With no annotations, the description carries the full burden of behavioral disclosure. It only says titles are discarded; it does not state the return value shape, whether a feed or URL parameter is required, whether live network access is involved, or any error or rate-limit 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 and front-loaded, with no filler. The fragment 'Titles discarded' is terse and slightly cryptic, but it does add a useful constraint; integrating it more clearly would improve the structure.

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?

There is no output schema and no annotations, so the description needs to explain return values and calling context. It fails to say what the tool returns beyond 'Count', which optional parameters apply, or how the count is obtained, leaving the wide 9-parameter schema confusing.

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 each parameter is already documented and the baseline is 3. The tool description does not map its purpose to any of the 9 optional parameters, but the schema itself provides the parameter-level meanings.

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 states a concrete action ('Count') on a specific resource ('current Hacker News front-page stories'), so the core purpose is clear. It does not explicitly distinguish from sibling tools or clarify the role of the 'Titles discarded' fragment, but the primary operation is unambiguous.

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 intended use is implied: invoke when a count of Hacker News front-page stories is needed, and 'Titles discarded' hints that this tool is not for retrieving story titles. However, no alternatives are named and no explicit when-not-to-use conditions are given.

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