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, but it only states that this is a catalog. It does not disclose whether the tool accepts input, whether it performs lookups, whether it is read-only, or what it returns. Furthermore, the accepted parameters (url, host, json, zone) are completely unrelated to an HTTP status code catalog, creating a significant unexplained mismatch between the stated behavior and the schema.

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, short, front-loaded sentence with no wasted words. It is appropriately compact for a tool that appears to be a reference resource, though it sacrifices substance for brevity.

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?

The description is drastically incomplete for a tool with 4 parameters, no annotations, and no output schema. It does not explain the role of any parameter, the expected output, or how the catalog behavior maps onto the provided inputs, leaving an agent unable to invoke the 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?

Although schema description coverage is 100%, the parameter descriptions are generic and tied to other concerns (URL normalization, hostname, JSON validation, timezone) rather than to HTTP status codes. The description adds no connecting meaning, so an agent cannot determine how these parameters relate to a status-code catalog. The high coverage baseline of 3 is reduced by the semantic disconnect.

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 clearly identifies the resource: a catalog of common HTTP status codes. It implicitly distinguishes itself from the sibling tools (citation, compatibility, normalize-url, validate-json, timezone), none of which relate to HTTP status codes. However, 'catalog' is a noun phrase with no verb indicating what action the tool performs, so it stops short of a fully specified purpose.

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 state use cases for looking up status codes, nor excludes any sibling tools. An agent is left to infer the intended context from the tool name and the sibling list alone.

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