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

The description implies a read-only counting operation, but it does not disclose side effects, network access, or how parameters are handled, especially since the schema includes unrelated fields with 'discarded' notes.

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 to the point, but the phrase 'Titles discarded' is cryptic and could be clearer without adding length.

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 omits essential context about parameter usage, output format, and why unrelated parameters are present, making it impossible to invoke correctly based on the definition alone.

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 has descriptions for all parameters, they are disconnected from the stated purpose (e.g., 'city', 'json', 'path'). None of the parameter descriptions explain how they contribute to counting Hacker News stories, so they add no meaningful guidance.

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 specific action and object ('Count current Hacker News front-page stories'), but the phrase 'Titles discarded' is ambiguous and the listed parameters are entirely unrelated to this purpose, undermining overall clarity.

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 use this tool versus alternatives, and the mismatch between the description and the parameter schema leaves the agent without any usage direction.

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