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

With no annotations, the description carries the full burden of behavioral disclosure. It only says it is a 'short catalog', implying a read-only reference listing, but does not disclose what inputs do, whether anything is returned, or what side effects might 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 and free of fluff, but it is under-specified: an 8-word noun phrase rather than a structured instruction. It is concise without being informative enough for a tool with four diverse optional parameters.

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, no output schema, and four optional parameters that do not obviously relate to the stated purpose, the description is incomplete. An agent cannot determine what to pass in or what result to expect.

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 schema already explains each parameter individually (e.g., 'JSON text to validate; discarded after the check'), but the tool description adds no connection between these parameters and HTTP status codes, so it does not increase semantic clarity.

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 subject matter: a 'catalog of common HTTP status codes'. However, it has no action verb (lookup, list, validate) and does not explain how the catalog relates to the four diverse parameters (url, host, json, zone), leaving the actual operation ambiguous.

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 guidance is given about when to use this tool versus its siblings 'citation' and 'compatibility'. There are no usage scenarios, prerequisites, or exclusions, so an agent must guess when this tool is appropriate.

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