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

With no annotations, the description carries the full burden and does reveal one important behavioral trait: the body is discarded, so only the HTTP status matters. But it does not disclose other behaviors such as redirects, authentication, whether a network request is made for non-URL parameters, or any side effects, leaving a meaningful gap for an agent.

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, with the purpose front-loaded and the body-discarded behavior immediately after. There is no filler or redundancy, 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 tool with nine optional parameters, no annotations, no output schema, and many overlapping siblings, this two-sentence description is insufficient. It does not specify which parameter to pass, what the return value looks like beyond 'HTTP status', why the other parameters are accepted, or how to select this tool among the sibling status and fetch 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 the baseline is 3. The main description adds little beyond implying the 'url' parameter is the one that matters; it does not clarify why eight other unrelated optional parameters exist or how they relate to the stated purpose. The url parameter's own schema description ('normalize or cite') even conflicts with the HTTP-status purpose, further reducing clarity.

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 operation: retrieve the HTTP status of a public library docs URL, while discarding the response body. This is specific enough to identify the core intent, but it does not explicitly differentiate this tool from siblings like fetch-status or web-fetch, and the nine unrelated optional parameters muddy the resource definition.

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 library docs URL' and 'Body discarded' imply a use case: check whether a docs URL is reachable without needing content. However, no alternative tools are named, no when-not-to-use guidance is given, and there is no explanation of how this differs from the many sibling status/fetch tools.

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