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

The description discloses that titles are discarded, but it does not explain the return format, that all parameters appear optional/ignored, or any side effects. With no annotations, this leaves important behavior unspecified.

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 at two short sentences and front-loads the primary purpose. There is no redundant or extraneous content.

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 confusing parameter list and absent output schema, the description does not sufficiently explain how to call the tool or what result to expect. It omits return format, parameter relevance, and edge-case behavior.

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 lists nine optional parameters with descriptions completely unrelated to counting Hacker News stories (Git refs, URLs, cities, timezones, etc.). The tool description provides no clarification of whether these parameters are meaningful, making the interface confusing.

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 tool counts current Hacker News front-page stories, giving a specific verb and resource. The phrase 'Titles discarded' adds a minor limitation, but the core purpose is immediately understandable.

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 choose this tool over alternatives, such as web-fetch or fetch-status, or whether the optional parameters should be supplied. The description lacks any usage context.

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