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

With no annotations provided, the description carries the full behavioral burden. It clearly discloses the HTTP method, the public-URL scope, and the status-only output, which gives a solid safety and behavior profile for a read-only probe.

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 earns its place by stating the method, target, and output.

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?

For a tool with 9 optional parameters, no output schema, and no annotations, a one-sentence description is insufficient. It does not clarify which field maps to the URL, that all other fields are ignored, or what 'status' looks like in the response, leaving an agent with real invocation ambiguity.

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?

Although schema coverage is 100%, the schema descriptions are mismatched with the tool's stated purpose: the 'url' parameter is described as 'HTTPS URL to normalize or cite', not as the target of a HEAD request. The description never tells the agent which parameter to populate or that the other nine optional fields are irrelevant, so parameter selection is unnecessarily ambiguous.

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 gives a specific verb ('HEAD'), a resource ('a public URL'), and the output ('status only'). It clearly distinguishes itself from content-fetching siblings like web-fetch by limiting the result to 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 phrase 'status only' implies the tool should be used when only an HTTP status is needed, not full content. However, it does not explicitly name alternatives or state when not to use it, leaving selection among siblings like browser-url-ok and web-fetch to inference.

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