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

With no annotations, the description carries the full burden of explaining side effects, network access, and output behavior. It only says 'Titles discarded,' but does not disclose that the tool likely fetches live data, whether it is read-only, or that the many optional parameters appear to be ignored for the count itself.

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 front-loaded, with no filler. It efficiently states the main purpose and a key output limitation. However, it is arguably too terse given the confusing nine-parameter schema, which could have used at least a sentence of clarification.

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 leaves important gaps: it does not specify what the returned count looks like, why so many unrelated parameters exist, whether any parameters should be passed, or how failures are handled. With no output schema and no annotations, these gaps make the tool harder to invoke confidently.

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 baseline is 3. The tool description itself adds no parameter-level meaning. The schema descriptions are unusual and hint that many values are discarded after checks, but the description does not help connect any of the nine parameters to the actual counting behavior.

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 clearly states a specific action and resource: count current Hacker News front-page stories. The added phrase 'Titles discarded' clarifies that the result is a count rather than a list of titles, which distinguishes it from fetch-style sibling 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?

The description implies when to use the tool: when a count of current HN front-page stories is needed. 'Titles discarded' provides a useful exclusion: do not use this tool if story titles are needed. However, no alternative tools are named and no explicit when-not-to-use guidance is given.

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