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

No annotations are provided, so the description must carry full behavioral disclosure. It says 'return status only' but doesn't specify what statuses are returned, whether it's a success/failure code, or how it handles the non-URL parameters. It also fails to mention that many parameters are discarded after validation.

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 extremely concise (one sentence), but it is under-specified rather than efficient. It omits critical information about the tool's multi-input behavior and return semantics, making it more of a placeholder than a useful definition.

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 9 optional parameters, no output schema, and no annotations, the description is grossly inadequate. An agent cannot determine what this tool does for inputs like city, zone, or json, nor what 'status' means in each case. The description fails to provide a complete picture for a tool with such a broad parameter set.

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 coverage is 100%, so each parameter has a description. However, the tool description does nothing to connect the URL-centric purpose to the other parameters. The description contradicts the schema's breadth by implying only URL handling, leaving agents confused about how to use the other 8 parameters.

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 clear verb and resource: HEAD a public URL and return status. However, the input schema includes 9 unrelated parameters (city, ref, zone, etc.), which the description ignores. It also doesn't differentiate from sibling tools like browser-url-ok or web-fetch.

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 on when to use this tool vs alternatives. The description gives no context about what types of inputs are appropriate or when a HEAD request would be preferred over other fetching tools. Sibling tools exist but no exclusions or conditions are mentioned.

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