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

The description does disclose that the body is discarded, which is a small behavioral detail. It does not mention whether a network request is made, redirects, timeouts, or error handling, so it does not fully carry the transparency burden.

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 extremely short and front-loaded, with the output type in the first words.

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?

With nine optional parameters and no output schema, the description is too thin to tell an agent how to construct a valid call or interpret the response. It does not specify return format beyond 'HTTP status' or explain what to do with the many discarded parameters.

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?

Each parameter has a one-line description, but several are explicitly marked discarded (ref, city, feed, query, etc.), and the only apparently relevant parameter, 'url', is described as 'to normalize or cite' rather than 'to check'. This makes it unclear which of the nine optional parameters actually affect the result.

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 the output (HTTP status) and the target (a public library docs URL), and notes that the body is discarded. However, it does not use an explicit verb like 'check' or 'fetch' and does not differentiate itself from sibling URL-status tools.

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?

No guidance is given about when to prefer this tool over fetch-status, browser-url-ok, or normalize-url. The only implicit hint is that it focuses on HTTP status and discards the body.

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