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

With no annotations provided, the description must carry the burden of disclosing behavior. It mentions returning status only but does not explain that the many additional schema parameters appear to be ignored or unrelated, nor does it state that HEAD is read-only and has no side effects.

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 a single concise sentence that front-loads the core action and result. It avoids unnecessary detail and is easy to parse.

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 too minimal for the complex, unrelated parameter set. It does not specify the output format (e.g., HTTP status code only), whether other parameters are required or ignored, or how to handle cases where no URL is provided. This leaves an agent uncertain about how to call the 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?

The schema descriptions are present and cover each parameter, but they are inconsistent with the tool's stated purpose. For example, the 'url' parameter is described as 'HTTPS URL to normalize or cite' rather than as the target of the HEAD request, and several parameters are described as being discarded, which is confusing for an agent.

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 performs an HTTP HEAD request on a public URL and returns only the status, which is a specific action with a clear resource. This distinguishes it from sibling tools like web-fetch or normalize-url that deal with content or URL transformation.

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 does not provide explicit guidance on when to choose this tool over alternatives such as browser-url-ok or web-fetch. The use of 'HEAD' and 'status only' implies a lightweight status check, but no direct comparison or exclusion is given.

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