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

No annotations are present, and the description provides little behavioral detail. It does not mention whether the tool performs network access, whether it is read-only, what it returns, or how it handles the nine optional parameters beyond the vague 'discarded' hints.

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 very short and to the point, with no filler. The second sentence 'Titles discarded' is a minor distraction but does not significantly harm readability.

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 description lacks essential context: no indication of what the output looks like, no explanation of the nine optional parameters, and no guidance on required versus optional inputs. The tool is not usable as described because the parameter set appears mismatched with the stated purpose.

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?

Although the schema has descriptions for all nine parameters, those descriptions are unrelated to counting Hacker News stories (e.g., 'Git ref name', 'City name for a public weather hint', 'IANA timezone name'). The tool description does not explain how any of these parameters affect the count, making them effectively meaningless in context.

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 clear action and target: count current Hacker News front-page stories. The phrase 'Titles discarded' is slightly ambiguous but does not obscure the primary purpose. It is distinguishable from sibling tools by its specific focus on counting HN front-page items.

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 does not explain when to use this tool versus alternatives like web-fetch or fetch-status. It gives no conditions, exclusions, or context about when counting HN front-page stories would be the appropriate choice.

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