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

With no annotations, the description must carry the full behavioral burden. It discloses two behaviors (returns an HTTP status, discards the body), but it does not explain what happens with the other eight parameters, whether any are side-effect free, or what the response includes. The behavior is underspecified relative to 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 two sentences are short and front-loaded, but the description is too terse for a nine-parameter tool. It is concise only by omission: the broad schema and important behavioral details are left out, so the brevity is not compelling.

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 tool has nine optional parameters, no annotations, and no output schema, but the description only explains a narrow use case. It does not explain why ref, city, json, zone, query, or path are included or how they relate to the stated HTTP status behavior, making it impossible for an agent to reliably call it 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?

The schema already provides 100% description coverage for all nine parameters, so the baseline is 3, but the description adds no extra parameter semantics. Worse, it suggests the tool is only for library docs URLs, which conflicts with parameters like city, zone, and json that imply broader uses.

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 names a specific outcome ('HTTP status for a public library docs URL') and notes that the body is discarded, which gives some sense of scope. However, the input schema contains nine unrelated parameters (city, json, zone, feed, etc.) that the description does not acknowledge, making the tool's true purpose 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?

There is no guidance about when to use this tool instead of siblings like web-fetch, fetch-status, or normalize-url. The description gives no usage context, prerequisites, or conditions that would help an agent choose this tool.

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