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

With no annotations, the description carries the full burden of behavioral disclosure. It does state the HTTP method (HEAD), the access scope (public URL), and the output scope (status only), which implies a read-only operation. But it does not explain how the nine optional schema parameters relate to the URL operation or what happens on redirects, timeouts, or errors.

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 sentence with no filler. It front-loads the method and outcome, and every word contributes to the meaning.

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?

With nine optional parameters and no output schema, the description is too thin to be fully actionable. It does not specify which parameter carries the URL, what the status return value looks like, or how to treat the many apparently unrelated optional parameters.

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 baseline is 3. The description adds only that a URL is being HEADed, but it does not map parameters or clarify why the schema includes many unrelated optional fields such as city, json, zone, and query. This leaves ambiguity about which parameters are actually used.

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 uses a specific verb and resource: 'HEAD a public URL' and narrows the result to 'status only.' This clearly distinguishes it from sibling tools like web-fetch or normalize-url, which fetch content or transform URLs rather than just reporting status.

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 usage is implied: use this tool when you need the HTTP status of a public URL without retrieving content. However, it does not explicitly name alternatives or state when not to use this tool, such as when page content or a full browser check is needed.

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