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

With no annotations, the description must carry behavioral disclosure, and it does provide one useful detail: 'Body discarded,' so the agent knows the response is just the status. However, it omits side effects, error/redirect behavior, and what happens with the other eight accepted parameters, and there is no output schema to compensate.

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 two short clauses with no filler; 'Body discarded' earns its place as a meaningful behavioral qualifier. It is somewhat too terse to cover the tool's nine-parameter schema, but as a writing-quality matter it is clear and front-loaded.

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 nine optional parameters, no annotations, no output schema, and many sibling status/URL tools, this one-liner is not enough for confident selection and invocation. It covers only the URL-status case and leaves the agent to guess response shape, failure modes, and applicability of the other fields.

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 coverage is 100%, so the baseline is 3, but the tool description adds little to parameter meaning and conflicts with the schema's url description, which says 'HTTPS URL to normalize or cite' rather than a docs URL whose status is checked. The description also does not connect 'public library docs URL' to the appropriate field or explain why the other parameters exist.

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 outcome—HTTP status for a public library docs URL—and adds that the body is discarded, signaling a lightweight status check. It is not a tautology and roughly differentiates from a full fetch, though it never explicitly says 'returns' and does not contrast with 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 fetch-status, browser-url-ok, normalize-url, or other siblings. The qualifier 'public library docs URL' weakly implies a scope, but no when-to-use or when-not-to-use conditions are stated.

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