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

No annotations are provided, and the description does not disclose side effects, permission requirements, rate limits, or error behavior. It does not even explicitly state that the tool is read-only or that the URL is not modified, which is critical for a HEAD request.

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 clear sentence, which is concise. However, it lacks structure such as separate sections for usage, parameters, or return format, and the brevity sacrifices essential information. It is not verbose, but it is too minimal for a tool with this many parameters.

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 omits nearly all contextual details: there is no explanation of the output schema, no description of how the parameters are used, no mention of error handling, and no indication of what 'status' means or what format it takes. The mismatched parameter descriptions further compound the incompleteness.

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 description itself says nothing about the 9 parameters. The schema descriptions are clearly mismatched for this tool (e.g., 'Git ref name; discarded after the shape check' for 'ref', 'City name for a public weather hint' for 'city'), providing no meaningful explanation of how they relate to fetching a URL status. The agent would be completely unable to infer correct usage.

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 clearly states the primary action ('HEAD a public URL') and the return value ('status only'), which is distinct from siblings like web-fetch or browser-url-ok. However, it does not explain how the many parameters relate to this purpose, leaving some ambiguity.

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 offers no guidance on when to use this tool versus alternatives like browser-url-ok, playwright-url-ok, or web-fetch, nor does it mention any prerequisites or typical use cases. It simply states the action without context.

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