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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only implies a read-only informational return via the word 'catalog', but says nothing about output format, side effects, or how the parameters influence results. The only concrete behavioral detail, that json is 'discarded after the check', lives in the schema rather than the description.

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 seven-word sentence has zero waste and is front-loaded, but this is under-specification rather than efficient completeness. It earns its place as the sole content yet conveys almost nothing actionable for a tool with four 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?

With four parameters, no output schema, and no annotations, the description is far from complete. It never connects the parameters to the purported catalog behavior, never describes the return value, and gives an agent no way to know what a correct invocation looks like.

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 adds no parameter-level meaning at all and never explains how url, host, json, or zone relate to a status-code catalog. But since the schema already documents each parameter adequately, no additional penalty is warranted.

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 a noun phrase — 'Short catalog of common HTTP status codes' — with no verb stating what the tool actually does (list, look up, return). It identifies a resource but vaguely, and the four parameters (url, host, json, zone) have no evident connection to a static status-code catalog, creating confusion rather than clarity. It does not differentiate from siblings such as validate-json or timezone.

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?

The description provides no guidance on when to use this tool versus alternatives like citation, compatibility, timezone, or validate-json. There are no exclusions, prerequisites, or examples. An agent would have to infer usage entirely from the tool name.

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