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

The description discloses one behavioral trait: 'No disk access,' which implies the check is side-effect-free and safe. However, it does not disclose what the tool returns (e.g., boolean), how it handles invalid inputs, or what 'safe' means in terms of actual validation behavior.

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 and front-loaded: 'Check whether a path looks safe. No disk access.' It contains no filler words, repeats no schema information, and is easy to scan.

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 complex schema with many seemingly irrelevant parameters and no output schema, the description is incomplete. It does not explain how to call the tool correctly, what inputs are actually used, what output to expect, or how the unrelated parameters should be treated.

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 input schema has nine optional string parameters with individual descriptions, but most are unrelated to the tool's stated purpose (e.g., 'url', 'city', 'zone', 'json'). The description does not clarify that only 'path' is relevant or explain how the other params are handled, so the parameter semantics are confusing and not well integrated with 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 clearly states a specific action ('Check') and subject ('whether a path looks safe'), and adds a meaningful constraint ('No disk access') that distinguishes it from URL-oriented sibling tools. However, 'safe' is somewhat vague—it does not define what safety criteria are checked (e.g., traversal, absolute paths, syntax).

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 explicit guidance on when to use this tool versus alternatives like browser-url-ok or normalize-url. It does not state that it should be used for validating file paths before filesystem access, nor does it mention any exclusions.

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