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

With no annotations, the description must disclose all behaviors. It only mentions that titles are discarded, which is vague and unrelated to the parameters. No side effects, permissions, or operational details are disclosed, making it insufficient.

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 brief, which is concise, but it omits critical information about parameter usage and output. Given the tool has nine parameters, the brevity is a deficiency, not a strength, as it fails to provide necessary context.

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 is severely incomplete for a tool with nine parameters and no output schema. It does not explain what the tool returns, how to use the parameters, or what the 'count' refers to, making it inadequate for correct usage.

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 descriptions already provide parameter details (e.g., 'discarded after the shape check'), but the tool description does not connect these parameters to the counting function. It adds no meaning beyond the schema and leaves the relevance of parameters like 'url' or 'city' unexplained.

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: counting Hacker News front-page stories. However, it does not explain how the input parameters relate to this action, making the purpose ambiguous given the schema. It is distinguishable from siblings by name but not by explicit comparison.

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 the many sibling tools. No context or selection criteria are provided, leaving the agent without direction on appropriate usage.

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