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

No annotations are provided, so the description must carry the burden of disclosing side effects, limitations, or error behavior. It only states the HTTP method and return type, without mentioning redirects, timeouts, ignore behavior for unrelated parameters, or any 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 verb and resource. There is no redundant wording or unnecessary detail, making it easy to parse quickly.

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 does not explain the format of the returned status, error handling, or how the many optional parameters interact with the HEAD request. Given the absence of an output schema, the description is insufficient for an agent to fully understand expected results and edge cases.

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 input schema contains nine parameters with descriptions that appear unrelated to a HEAD request (e.g., 'Git ref name', 'City name', 'JSON text to validate'). The url parameter description ('HTTPS URL to normalize or cite') is inconsistent with the tool's stated purpose, making the parameters confusing and potentially misleading.

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 action ('HEAD a public URL') and expected result ('return status'), which clearly identifies the tool's core purpose. It does not explicitly distinguish it from sibling tools like web-fetch or browser-url-ok, but the HTTP method and focus on status make the purpose reasonably clear.

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 provides no guidance on when to use this tool instead of alternatives, such as web-fetch for content or browser-url-ok for availability checks. There is no mention of appropriate conditions, limitations, or exclusions, leaving the agent without usage context.

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