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

No annotations are provided, so the description carries the full behavioral burden. It conveys that this is a read-only reference ('short catalog') but does not disclose the return format, whether inputs like url, host, json, or zone affect output, or any side effects. The input schema hints at validation/normalization behavior ('JSON text to validate; discarded after the check') that the description never connects to the status-code catalog.

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 eight-word sentence with no filler, and the core subject is front-loaded. It is efficient and easy to parse, though the brevity contributes to the behavioral and usage gaps noted elsewhere.

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?

For a tool with four unrelated-looking optional parameters, no annotations, and no output schema, this description is incomplete. It never explains why a status-code catalog would accept a URL, JSON text, timezone name, and host, nor what the agent should expect in return. The description covers the happy-path concept but not enough to invoke the tool with confidence.

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%, and each parameter has a meaningful description (e.g., 'HTTPS URL to normalize or cite'), so the schema carries the parameter documentation burden. The tool description adds nothing about how url, host, json, or zone relate to the catalog lookup. Baseline 3 is appropriate because the schema is sufficient but the description fails to link the parameters to the tool's purpose.

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 resource clearly — a catalog of common HTTP status codes — and the subject is distinct from siblings like validate-json or timezone. However, it is a noun phrase without an explicit action verb ('return', 'look up'), and it largely restates what the name 'status-catalog' already implies. It is clear but under-specified about what the agent can actually do with it.

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 on when to use this tool versus alternatives such as normalize-url or validate-json; there are no prerequisites, exclusions, or context cues. The only signal is the name and the one-line description, which implies a reference lookup but never states it explicitly. For a tool with multiple optional parameters, this is a notable gap.

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