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

With no annotations, the description carries the behavioral burden. It usefully discloses that only the HTTP status is returned and the body is discarded. However, it does not describe network-side behavior, failure handling, redirects, or the fact that most schema parameters are ignored during execution.

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, purposeful sentences with no filler. The core purpose is front-loaded and the body-discard behavior is a relevant secondary fact. 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?

This is a nine-parameter tool with no annotations and no output schema, so more contextual burden falls on the description. It does not specify which parameter should be passed, what a returned status looks like, how errors are represented, or how this tool relates to the many sibling URL/status 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 description adds a slight clue that the url parameter is the relevant input, but it does not name that parameter or explain the role of the other eight parameters. The schema already documents most fields as discarded, so the description provides limited extra parameter meaning.

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 HTTP status for a public library docs URL and discards the body. This makes it distinguishable from content-fetching tools like web-fetch, though it does not explicitly name or differentiate a sibling such as 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?

'For a public library docs URL' gives clear context, but there is no explicit when-to-use or when-not-to-use guidance. The description does not name alternatives like fetch-status, browser-url-ok, or normalize-url, so an agent must infer the intended selection.

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