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

No annotations are provided, so the description carries the burden of behavioral disclosure. It valuably states that the body is discarded and that the URL must be public. It does not mention redirects, timeouts, error handling, or side-effect potential, making the disclosure adequate but incomplete.

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 two short sentences with no filler. The core purpose is front-loaded, and the caveat about discarding the body is immediately useful and does not waste space.

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 tool has nine parameters, no output schema, and no annotations, yet the description only explains the URL-facing behavior. It does not clarify how the many optional parameters relate to the tool or what response/error details to expect, leaving important context to inference.

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 the schema already documents each parameter. The description adds little parameter-level meaning beyond emphasizing URL as the meaningful input, but because the schema is self-sufficient, the baseline score of 3 is appropriate.

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 and resource: return the HTTP status and content type for a public URL. It also clarifies that the body is discarded, which clearly separates it from tools that return page content. This is specific enough for an agent to understand the core purpose.

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 'for a public URL' gives a clear context, and 'Body discarded' implies this tool should not be used when page content is needed. However, it does not explicitly name alternatives such as fetch-status or browser-url-ok, so guidance about when to choose this tool over siblings is only implied.

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