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

With no annotations, the description carries the behavioral burden. It does disclose a key behavior (HTTP status returned, body discarded), but it does not explain how the surplus parameters are treated, whether redirects are followed, or what error/timeout behavior to expect.

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 no filler; the core behavior is front-loaded. 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?

The description is too sparse for a tool with nine optional parameters, no required fields, no output schema, and no annotations. An agent cannot tell how to construct a valid invocation or which parameter matters, so the definition is not complete enough for correct use.

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?

All nine parameters have schema descriptions, so the baseline is 3, but the description fails to resolve which parameter is the URL to check. The `url` schema description ('HTTPS URL to normalize or cite') conflicts with the tool's stated status-checking purpose, and the other parameters are marked as discarded for unrelated checks, adding confusion.

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 specific action and resource: it returns an HTTP status for a public library docs URL, and notes the body is discarded. This is more informative than a tautology and gives a basic sense of what the tool returns, though it does not differentiate from sibling status tools like fetch-status.

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 when-to-use or alternative guidance is provided. The phrase 'Body discarded' hints that the tool is not for content retrieval, but it never names siblings or states conditions for choosing this over fetch-status, browser-url-ok, or web-fetch.

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