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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It only mentions that titles are discarded, but does not disclose network access, failure modes, caching, or that the tool accepts many optional parameters that are largely irrelevant to the described purpose.

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 a single sentence with no fluff, front-loading the core purpose immediately. It is maximally concise and structured.

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 simple purpose, the tool accepts nine optional parameters that are seemingly unrelated to counting HN stories. The description does not explain how these parameters interact with the count or whether they are ignored entirely. Without an output schema or additional context, an agent would be uncertain how to invoke this tool correctly.

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 coverage is 100% with each parameter individually described, so the baseline is 3. The description adds no parameter-level information; it neither clarifies which parameters are relevant for the HN count nor explains the relationship between the parameters and the described action.

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 the action (count) and resource (Hacker News front-page stories) and even adds the useful detail that titles are discarded. However, it does not differentiate from sibling tools, though none seem to directly compete with this specific count operation.

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 provides no guidance on when to use this tool versus alternatives, no conditions, no exclusions. It simply states what it does without contextualizing against siblings like web-fetch or domain-shape.

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