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

No annotations are present, and the description does not disclose any side effects, permissions, or data handling. The parameter descriptions mention that certain values are 'discarded after the shape check' or 'discarded after the length check', which hints at validation behavior but is not explained in the tool description.

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 concise (one sentence), but the brevity sacrifices clarity. The phrase 'Titles discarded' is cryptic and the lack of any parameter explanation makes the description inefficient for understanding the tool.

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?

No output schema or return value description is provided. The description says it counts stories but does not specify the output format. The parameter list is irrelevant to the purpose, and there is no mention of how the tool interacts with Hacker News data, making the context highly incomplete.

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?

The schema includes descriptions for all parameters, but they are completely unrelated to the tool's stated purpose (e.g., 'Git ref name', 'City name', 'IANA timezone name'). The tool description provides no context to connect these parameters to counting Hacker News stories, leaving semantics entirely unclear.

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 a clear verb and resource ('Count current Hacker News front-page stories'), but the phrase 'Titles discarded' is confusing and the parameter list is entirely unrelated to the stated purpose, making the actual function ambiguous.

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 provided for when to use this tool versus alternatives. The description does not mention any use cases, preconditions, or comparisons to sibling tools.

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