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

With no annotations, the description carries the full burden and discloses only that the result is a live count and titles are excluded. It does not state what output format is returned, whether a network request occurs, or how the nine optional schema parameters relate to 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 short and action-first with no fluff. The phrase 'Titles discarded' is cryptic, which keeps it from full marks, but it earns its place as a behavioral qualifier.

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 tool with nine optional parameters, no annotations, and no output schema, this two-sentence description is insufficient. It fails to explain parameter relevance, invocation behavior, or return shape, so an agent cannot confidently invoke it.

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 even though the description itself provides no parameter guidance. The schema gives each parameter a meaning, but those meanings are mostly unrelated to the stated tool purpose, and the description does not clarify which parameter(s) to use.

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 operation—counting current Hacker News front-page stories—and adds 'Titles discarded' to narrow the output. It is not a tautology, though it does not explicitly differentiate itself from sibling tools like web-fetch or memory-key-count.

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 or when not to use it. 'Titles discarded' hints that title retrieval should be done elsewhere, but no sibling or condition is mentioned.

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