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

With no annotations, the description must carry behavioral disclosure on its own. It does disclose a meaningful behavioral trait—'Titles discarded'—and implies a live fetch by saying current, but it does not state what the return value looks like or note any network/external dependencies.

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 two short, front-loaded sentences with no filler. 'Count current Hacker News front-page stories' immediately states the action, and 'Titles discarded' adds relevant behavioral detail without wasting words.

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?

Despite the tool's simple core purpose, the surrounding context is complex: nine optional parameters, no required fields, and no output schema. The description does not indicate what the tool returns, whether it accepts no meaningful arguments, or how any of the parameters relate to counting HN stories, leaving an agent with significant gaps.

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 the input schema already documents all nine parameters. The description adds no additional parameter-level meaning and does not clarify which, if any, of the unrelated optional parameters are actually used by this tool.

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 an exact, specific operation: count current Hacker News front-page stories. The phrase 'Titles discarded' further clarifies that the result is a count, not a list of headlines, which distinguishes it from content-fetching or listing 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?

No guidance is given about when to choose this tool over alternatives such as web-fetch, fetch-status, or similar network tools. The description implies a use case through its purpose but provides no explicit when-to-use or when-not-to-use conditions.

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