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

With no annotations provided, the description carries the full burden of explaining side effects, network access, rate limits, or data handling. It only states the action and a cryptic note about titles, offering no transparency about the tool's behavior beyond the surface action.

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 extremely concise, consisting of two short sentences. It is well-structured and free of unnecessary content, but the brevity sacrifices essential information about parameters and usage, making it concise yet incomplete.

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?

Given the presence of 9 optional parameters with seemingly irrelevant descriptions, the tool description fails to provide sufficient context for correct invocation. It does not explain whether parameters are intended to be ignored, what each parameter does in the context of counting stories, or what output to expect, leaving the agent with a large gap in understanding.

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 100% description coverage for its 9 parameters, those descriptions are generic and unrelated to counting Hacker News stories (e.g., 'url' for normalization, 'city' for weather). The tool description does not map any parameters to its purpose, so an agent cannot determine which, if any, parameters should be provided.

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 verb 'Count' and the specific resource 'Hacker News front-page stories', making the primary purpose understandable. However, it does not explicitly mention that the tool returns a number, and the odd phrase 'Titles discarded' adds minor ambiguity about output format.

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 gives no indication of when to use this tool versus any of the 27 sibling tools. There is no mention of suitable use cases, prerequisites, or scenarios where this tool is preferred, leaving the agent without guidance on selection.

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