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

The action is read-only by nature, and several parameter descriptions disclose that values are discarded or not used (e.g., 'no disk access'), which adds some transparency. However, there is no explicit statement about side effects, errors, or output format beyond the count.

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 extremely short and to the point, consisting of two sentences with no filler or redundant detail. 'Titles discarded' is a useful clarification rather than unnecessary verbosity.

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?

With no output schema and no annotations, the description should state the return shape or explicitly say that all parameters are ignored; it does neither. The core behavior is clear, but the presence of nine irrelevant optional parameters leaves important context unresolved.

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 optional parameters, those descriptions are unrelated to counting HN stories and mostly state that values are discarded after checks. The tool description adds no explanation of why these parameters exist or how they affect the result, so an agent cannot infer meaningful 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 names a specific action ('Count') and target ('current Hacker News front-page stories'), making the tool's core function unambiguous. It also clarifies that titles are not part of the result, which distinguishes output expectations.

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 guidance is given about when to choose this tool over alternatives, and no comparison with sibling tools is offered. The description only states what the tool does, not when it should be used.

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