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

No annotations are provided, and the description does not disclose side effects, authentication requirements, rate limits, or output format. The presence of many unrelated optional parameters makes the tool's actual behavior even more opaque.

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 to the point, containing only two sentences. 'Titles discarded' adds a bit of clarification but is somewhat ambiguous; still, there is no significant fluff.

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 tool has no output schema and its description does not explain how any of the 9 optional parameters affect the count. Given the mismatched and irrelevant parameter descriptions, the context is far from complete.

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 description coverage is 100%, every parameter description is unrelated to counting Hacker News front-page stories (e.g., 'Git ref name', 'IANA timezone name'). This provides no meaningful semantics for how the parameters should be used.

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 the resource ('Hacker News front-page stories'), which gives a solid sense of purpose. However, it does not distinguish this tool from sibling tools that might also access HN content, such as web-fetch.

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?

There is no guidance on when to use this tool versus alternatives. The phrase 'Titles discarded' hints at output behavior but does not explain usage conditions or prerequisites.

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