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

No annotations are provided and the description discloses no behavioral traits—no indication of whether the tool is read-only, whether it performs network calls, has rate limits, or produces side effects. The parameter descriptions suggest behaviors from other tools (URL normalization, JSON validation, timezone handling) but nothing is disclosed about the actual behavior of this tool.

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 a single concise sentence, which is structurally clean and brief. However, the brevity works against clarity here—the one sentence provides only a vague noun-phrase purpose without explaining the operation or parameter linkage. It is concise but not effectively informative.

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 the tool's complexity (four parameters with seemingly unrelated purposes), the description is severely incomplete. It does not explain how the parameters relate to the catalog functionality, what the expected input/output format is, or any usage examples. Without an output schema or additional context, an agent cannot reliably determine how to invoke this tool correctly.

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?

While schema coverage is 100% with descriptions for all four parameters, those descriptions are semantically mismatched with the tool's stated purpose. Parameters like 'url' (HTTPS URL to normalize or cite), 'json' (JSON text to validate), and 'zone' (IANA timezone name) have nothing to do with an HTTP status code catalog, and no parameter exists that would logically query status codes. The descriptions actively mislead rather than clarify.

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 the tool is a 'Short catalog of common HTTP status codes,' which gives a general topic but no clear verb or operation (lookup, list, filter?). It does not distinguish itself from sibling tools, and the stated purpose conflicts with the parameter names—none of which relate to status codes. This creates significant ambiguity about what the tool actually does.

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 on when to use this tool versus alternatives. The description does not explain how the provided parameters (url, host, json, zone) would be used to access the status code catalog, nor does it contrast with sibling tools like validate-json or normalize-url. No usage context is provided at all.

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