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

With no annotations provided, the description carries the full burden. 'Body discarded' is a useful behavioral disclosure, and it clarifies that the response is limited to status. Still, it does not cover redirects, timeouts, error handling, or whether the other schema parameters affect behavior.

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 and front-loaded: the main action appears in the first sentence, and the second sentence adds a meaningful behavioral constraint. Every word earns its place; there is no filler or repetition.

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 definition is incomplete given the large optional schema, no output schema, and no annotations. It does not define the return format for the HTTP status, does not clarify how to supply the docs URL, and ignores the eight other parameters that the schema invites an agent to consider.

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 schema coverage is 100%, the schema is misaligned with the description: the 'url' parameter is described as 'HTTPS URL to normalize or cite', not as a docs URL to fetch status for, and the schema also contains unrelated parameters like city, feed, json, and query. The description does not explain which parameter is the intended docs URL, making correct invocation ambiguous.

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 a specific action and resource: returning the HTTP status for a public library docs URL. The 'Body discarded' clause helps distinguish it from full-fetch tools, though it does not explicitly name any sibling alternatives.

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 intended context is implied: use when you need an HTTP status for a public library docs URL. However, there is no explicit guidance about when not to use it, which sibling to prefer for generic URLs, or what to do if the URL is not a library docs page.

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