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

With no annotations, the description must disclose behavior, but it only states it's a 'short catalog'. It does not indicate whether the tool makes network calls, performs validation, or has side effects, despite parameters like url and host implying some external interaction. This is a significant transparency gap for a tool with no structured behavioral hints.

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 sentence, which is concise and free of fluff. However, it is underspecified and not front-loaded with actionable details; it reads more like a placeholder than a guide. The brevity does not earn credit when it omits critical information.

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 9 parameters, no output schema, and no annotations, the description is grossly incomplete. It fails to explain what the tool does with the inputs, what it returns, or any constraints, making it nearly impossible for an agent to invoke it correctly without further investigation.

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?

The schema already provides descriptions for all 9 parameters with 100% coverage, so the baseline is 3. The description adds no additional meaning about how parameters relate to the catalog or how they should be used, so it neither improves nor worsens the schema's own documentation.

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 provides a catalog of HTTP status codes, which identifies the resource and general action. However, it doesn't explain how the 9 unrelated parameters (e.g., url, city, json) are used, nor does it differentiate from siblings like fetch-status or normalize-url, leaving the purpose partially 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 on when to use this tool versus alternatives. The description does not mention any conditions, exclusions, or related tools, so an agent cannot determine if this is the appropriate choice among the many sibling tools.

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