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 reveals one trait ('Titles discarded') and that the data is 'current', but it does not state network access, output shape, or any side-effect safety. This is minimal disclosure.

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?

Two short sentences, with the core action first and the output-shaping note second. No filler or repetition; every word earns its place.

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 count operation with no required parameters, the description is nearly sufficient, but it leaves open which optional fields apply, if any, and does not explicitly state the return type beyond 'count'. Given the 9-parameter generic schema and the absence of output schema and annotations, a bit more guidance would make it solid.

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?

All 9 parameters already have descriptions in the schema, so the description does not need to re-document them. However, the tool description does not tie any parameter, such as 'feed', to the operation, so it adds no semantic value beyond the schema.

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 names a specific verb and resource: count current Hacker News front-page stories. 'Titles discarded' clarifies that the result is a count, not the stories. No sibling tool advertises this behavior, so it is distinguishable.

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?

There is no statement of when to use this tool versus any alternative, and no mention of whether a feed or URL should be supplied. The tool is implicitly selected by an HN-front-page request, but the description gives no explicit trigger, prerequisites, or exclusions.

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