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

With no annotations provided, the description carries the full transparency burden. It does disclose that the body is discarded, which meaningfully tells the caller not to expect content. However, it does not mention network behavior, redirects, timeouts, error handling, or whether the operation is strictly read-only, leaving some important behavior undisclosed.

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 two short sentences with the main purpose front-loaded and no filler. 'Body discarded' earns its place by clarifying the output behavior. However, given the tool's nine optional parameters, the description is perhaps slightly too terse and could have used an added sentence on the relevant parameter.

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 tool has nine optional parameters, no output schema, and no annotations, so the description must compensate. It does not indicate which parameter is used, what the response format looks like, what 'hint' means in this context, or how this relates to the many sibling tools. The definition is incomplete for an agent to confidently select and invoke this tool correctly.

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 description coverage is 100%, many parameter descriptions seem mismatched with the tool's stated purpose: 'city' references a weather hint, 'zone' is a timezone, 'json' is for validation, and 'query' is for a length check. The description does not explain which parameter to use for the HTTP status check, and the 'url' parameter is described as 'to normalize or cite' rather than to fetch a status. The schema therefore provides little coherent help for selecting the correct parameter.

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 verb and resource: it returns the HTTP status for a public library docs URL. The added 'Body discarded' clarifies the scope of the result. It does not explicitly differentiate itself from sibling tools like fetch-status or web-fetch, but the 'public library docs URL' qualifier narrows the purpose.

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 instead of siblings such as fetch-status, browser-url-ok, web-fetch, or normalize-url. The description gives no context about prerequisites, preferred inputs, or exclusions. It is left entirely to the agent to infer the intended use case.

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