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

With no annotations provided, the description carries the behavioral burden. It does disclose that the body is discarded, which is useful, but it does not mention whether the tool performs a network request, how errors are handled, redirect behavior, or whether any other side effects occur.

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 and front-loaded: the primary action and the body-discard behavior are stated in two brief sentences. It is concise with no filler, though it sacrifices some necessary context.

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?

Given 9 optional parameters, no annotations, and no output schema, the one-sentence description is insufficient. It does not explain what the return value looks like, which parameters to use, why most schema parameters are seemingly unrelated, or how this tool behaves when the URL is invalid or unreachable.

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 baseline is 3. The tool description adds no parameter-level meaning beyond the schema; it does not clarify that 'url' is likely the relevant parameter or how the other eight optional parameters relate to the stated purpose.

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 concrete outcome: it returns the HTTP status for a public library docs URL, and mentions that the body is discarded. This makes the core purpose understandable, though it does not explicitly contrast with sibling tools like fetch-status or browser-url-ok.

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 scope 'for a public library docs URL' implies when the tool should be used, but the description gives no explicit usage guidance, no prerequisites, and no mention of when to prefer a sibling tool such as fetch-status or normalize-url.

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