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

No annotations are provided, so the description carries the full burden. It only says the tool is a catalog; it does not disclose whether inputs are used, whether any state changes occur, what is returned, or whether there are side effects. The schema descriptions mention discarded inputs and 'no disk access,' but the description itself provides no behavioral transparency.

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 text is short, but it is under-specified rather than concisely structured. It reads like a title, not a tool description, and lacks a verb or actionable framing. There is no front-loaded usage instruction.

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 9 unrelated optional parameters, no output schema, and no explanation of how the catalog relates to the parameters, the definition is not complete enough for an agent to call the tool correctly. The schema hints at shape-checking behavior, but the description does not clarify what the tool returns or how to invoke it.

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 itself adds no parameter meaning, but the schema compensates by describing each parameter, including discard behavior and constraints like 'no disk access.'

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 is essentially a noun phrase restating the tool name: 'Short catalog of common HTTP status codes.' It does not state an action an agent can perform or the resource being acted upon, and it fails to distinguish status-catalog from sibling fetch-status, which also deals with HTTP statuses.

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, what problem it solves, or when alternative tools like fetch-status or normalize-url would be preferable. The 9 optional parameters and no required parameters make the intended invocation even less clear.

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