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

With no annotations provided, the description carries the transparency burden. It does disclose a meaningful behavior: the response body is discarded, so only the HTTP status matters. However, it does not mention network side effects, redirects, timeouts, error behavior, or why so many unrelated parameters are accepted, leaving important behavioral context missing.

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 appropriately short and front-loaded with the main action, followed by a useful discard note. It has no filler, though it omits enough context to be fully self-sufficient, so it is not a perfect 5.

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 parameters, no annotations, and no output schema, this two-sentence description is insufficient. It does not explain the broad parameter surface, what the return value looks like beyond 'HTTP status,' or how this tool relates to its many siblings, leaving significant contextual gaps.

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 description adds no parameter-level meaning beyond what the schema already provides, and its narrow URL framing obscures the other eight accepted parameters. It neither compensates for gaps nor enriches the schema's parameter explanations.

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 action and resource: returning the HTTP status for a public library docs URL and discarding the body. However, the input schema exposes nine unrelated parameters such as city, zone, json, and query, so the stated purpose does not accurately cover the full invocation surface and does little to distinguish it from sibling tools like fetch-status or normalize-url.

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?

There is no guidance about when to use this tool instead of alternatives like fetch-status, browser-url-ok, normalize-url, or other URL/status tools. The intended use is only implied by the phrase 'HTTP status for a public library docs URL,' with no exclusions, prerequisites, or alternative conditions stated.

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