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

No annotations are present, so the description carries the disclosure burden. It does disclose the key behavior: a read-only HEAD request to a public URL, returning status rather than body. It does not explain how the many non-URL parameters are treated, nor does it clarify redirect, timeout, or output-format behavior, so transparency is only partial.

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 front-loaded sentence with no filler. Every word contributes to the core operation: HEAD, public URL, status only. It is concise and 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 core operation is clear, but the tool exposes 9 optional parameters, has no annotations, and has no output schema. The description does not clarify which parameter should be used for the HEAD request, what the returned status looks like, or how the seemingly unrelated optional parameters (ref, city, json, path, query) fit in. The schema compensates partially, but the description alone leaves notable gaps.

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?

Schema description coverage is 100%, so the schema already documents each of the 9 optional parameters. The description adds no parameter-level meaning and does not explicitly map 'public URL' to the `url` parameter, but the schema descriptions are sufficient to reach the baseline.

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 operation: perform an HTTP HEAD on a public URL and return only the status. The phrase 'status only' distinguishes it from content-fetching tools like web-fetch, though it does not explicitly name siblings. It is clear for the core use case, even if the broader optional parameter surface is not acknowledged.

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 implies the tool is for situations where only a status is needed, not page content. However, it gives no explicit when-to-use/when-not-to-use guidance and does not name alternative tools such as web-fetch or browser-url-ok for richer checks. This is implied usage rather than explicit routing.

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