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

With no annotations, the description must disclose side effects, ignored inputs, and error behavior itself. It does state HEAD and status-only, and some parameter descriptions mention discarded values, but the main description does not explain how the many unrelated parameters are handled, redirects, or failure modes.

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 focused sentence with no filler or repetition. It is front-loaded and easy to scan.

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 and no output schema, but the description only says 'return status only.' It does not specify which parameter is the URL target, what exact status is returned, how ignored fields are treated, or what happens on network errors or redirects, so an agent cannot reliably invoke it.

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?

Every parameter has a description, but most descriptions are disconnected from the stated HEAD-URL purpose and several explicitly say they are discarded or only checked for shape/length. The 'url' parameter is described as 'to normalize or cite' rather than as the target of the HEAD request, so the schema does not clarify which field drives the operation.

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 names a clear action and resource ('HEAD a public URL and return status only'), but the input schema exposes many unrelated optional fields (city, json, path, zone, query), so the intended scope is muddied. It only weakly distinguishes from sibling URL tools like web-fetch or browser-url-ok.

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?

No guidance is given about when to choose this tool over alternatives such as browser-url-ok, web-fetch, or status-catalog. The phrase 'status only' implies a use case, but there is no explicit when-to-use or when-not-to-use instruction.

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