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

With no annotations, the description carries the behavioral burden, and it does usefully disclose that only status/content type are returned and the body is discarded. However, it does not explain that non-URL parameters appear to be ignored, nor does it address network behavior such as redirects, timeouts, auth, or failure handling.

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 short, front-loaded, and contains no filler; the key constraint 'Body discarded' is stated immediately. It is slightly under-specified for a tool with a confusing nine-parameter schema, but that issue is better captured by completeness rather than conciseness.

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 no annotations, no output schema, and a schema containing nine optional parameters, this sparse description is incomplete. It does not identify which parameter is required in practice, what happens when other parameters are passed, or how the tool relates to sibling fetch and status-checking tools.

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 description coverage is 100%, so each parameter already has an individual description and the baseline is 3. The tool description adds little beyond implying that `url` is the meaningful parameter, and it does not rationalize why the schema includes eight unrelated optional fields.

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 specifies a narrow operation: return HTTP status and content type for a public URL, discarding the body. It is easy to understand on its own, but it does not distinguish this tool from siblings like fetch-status, browser-url-ok, or normalize-url.

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 gives almost no guidance about when to choose this tool over alternatives like fetch-status or browser-url-ok. It also fails to clarify which of the nine optional schema parameters should actually be supplied, especially when most are unrelated to URL fetching.

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