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

No annotations are provided, and the description only discloses that the tool performs no disk access. It does not mention return values, success/error behavior, or whether it validates syntax only—leaving the tool's observable behavior largely unspecified.

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 extremely concise, using two short sentences to convey the primary purpose and a key behavioral guarantee. It wastes no words, though it could benefit from a little more specificity.

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 no output schema, no usage examples, no return-type information, and no indication of which parameter to pass, the description leaves critical context missing. An agent would not be able to reliably interpret the result or know how to formulate a valid call.

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?

Although the schema has 100% description coverage, most of the parameters (ref, url, city, feed, host, json, zone, query) appear irrelevant to the stated purpose of checking a file path. Only 'path' is clearly relevant, and the presence of many unrelated optional fields creates confusion about what the tool actually accepts.

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 clearly states that the tool checks whether a path looks safe and explicitly notes no disk access, which distinguishes it from sibling URL and domain checkers. However, 'looks safe' is somewhat ambiguous—it does not specify what safety criteria are checked.

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 gives no guidance on when to use this tool versus alternatives like browser-url-ok or normalize-url, and it does not explain which of the nine schema parameters should be provided. It only notes the absence of disk access, which is a minimal safety signal.

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