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

With no annotations, the description carries the full behavioral burden but only says 'short catalog.' It does not state whether the operation is read-only, what the return value looks like, whether the optional inputs are actually consumed, or whether side effects exist.

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 short, front-loaded, and contains no filler; the word 'short' even signals scope. Being under-specified is more a completeness issue than a conciseness issue.

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 no annotations and no output schema, the description is too thin to fully support invocation. It does not explain that no parameters are required, how the parameters relate to the result, or what the returned catalog contains beyond 'common HTTP status codes.'

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 four parameters have schema descriptions, so the baseline is 3. The tool description adds no meaning to the parameters, and those parameters look unrelated to an HTTP status code catalog, but the schema itself already documents their literal 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 names the resource ('catalog of common HTTP status codes') and the content domain, which gives a basic sense of purpose. However, it is a noun phrase rather than an action statement, and it does not reconcile the catalog topic with the url/host/json/zone parameters, so an agent cannot tell whether this returns a static list or checks a URL's 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?

There is no when-to-use or when-not-to-use guidance, and no mention of alternatives despite siblings like normalize-url, validate-json, and iana-zones covering adjacent use cases. The agent is left to infer selection from the name alone.

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