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

With no annotations, the description carries the full disclosure burden. It does reveal one meaningful behavioral trait: the body is discarded, so only the HTTP status is relevant. It does not mention network behavior, redirects, error handling, auth, or rate limits, but for a simple status probe the stated behavior is minimally transparent.

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?

Two short sentences, front-loaded with the action and target. There is no filler, no restatement of the schema, and every word earns its place.

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 9-parameter tool with no annotations and no output schema, the description is too sparse. It does not explain which parameter to provide, what happens with the other accepted parameters, what the HTTP status result looks like, or how this tool relates to siblings like fetch-status, browser-url-ok, and web-fetch.

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 input schema has 100% per-parameter description coverage with explicit 'discarded' notes, so the baseline is 3. The tool description itself adds little parameter meaning beyond narrowing the URL concept to 'public library docs', and it does not clarify which of the nine optional parameters are expected.

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 names a concrete action ('HTTP status') and a specific target ('public library docs URL'), and adds that the response body is discarded. It is not a tautology and is reasonably distinguishable from generic fetch-status tools because of the docs-URL restriction, though it does not explicitly differentiate itself from siblings.

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 'public library docs URL' and 'Body discarded' imply this is for lightweight status checks where content is not needed. However, there is no explicit when-to-use or when-not-to-use guidance, and no alternative tools such as fetch-status or web-fetch are named, so the boundary must be inferred.

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