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

With no annotations, the description and implementation notes carry the full burden of behavioral disclosure. 'No disk access' is a useful boundary that tells the agent the tool will not actually touch files, but it does not explain what a 'safe' path means, whether the check is syntactic only, what it returns, or whether it has any other side effects. This is minimal but not completely absent.

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 very short and front-loaded, with no filler: it states the core action first and then adds the most important behavioral boundary. It is concise, but it is concise at the expense of missing useful usage and context details.

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 9 optional parameters, 0 required, no output schema, and no annotations, the description has to explain how the tool is invoked and what should be passed. It does not explain how the remaining params relate to the path check, what a useful call would contain, or how results are reported. This leaves the agent unable to confidently use it.

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 description coverage is 100%, so the schema describes all 9 parameters. The description itself adds little parameter-level meaning; it only reinforces the path check and leaves connections among the other optional parameters unexplained. The baseline of 3 is appropriate because the schema does the heavy lifting.

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 gives a specific verb and resource: 'Check whether a path looks safe. No disk access.' This clearly communicates that the tool performs a static, non-filesystem path safety check. It does not explicitly differentiate from sibling URL-shape tools like browser-url-ok or playwright-url-ok, but the path focus is reasonably clear.

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, when not to use it, or which sibling tool is a better alternative. The description does not mention prerequites, expected input modes, or any conditions such as 'use this instead of a filesystem-access tool.' This leaves the agent to infer context on its own.

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