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

With no annotations, the description carries the full transparency burden. It only implies a network request via 'HEAD' and states that status is returned, but it does not disclose side effects, access patterns, or the fact that most schema parameters are 'discarded' or checked without disk access.

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, front-loaded sentence with no wasted words. It loses a point because it omits any mention of the tool's actual multi-parameter behavior, making it too terse relative to the schema complexity.

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?

Given the nine-parameter schema, no output schema, and no annotations, the description is far from complete. It does not explain how the different parameters relate, what the return value looks like, or what happens when multiple parameters are provided.

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 coverage is 100%, so the baseline is 3. The tool description itself adds no parameter-level meaning; however, the schema descriptions do provide individual semantics for each parameter, even if some are inconsistent with the tool's stated URL-focused 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 a clear action for one input ('HEAD a public URL and return status only'), but the schema exposes nine unrelated optional parameters (ref, city, feed, json, path, zone, query). This makes the actual scope of the tool ambiguous and misrepresents its broader multi-input nature.

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 any sibling tools. It does not mention alternatives like normalize-url, browser-url-ok, or validate-json, nor does it explain which parameter should be supplied for which use case.

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