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

With no annotations, the description carries the burden of behavioral disclosure. It usefully states 'No disk access,' which is a meaningful safety trait. Still, it does not disclose what 'looks safe' means, what the return value looks like, or whether other parameters are ignored.

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 two tight, front-loaded sentences with no filler. The main action comes first and the important side-effect disclaimer follows immediately.

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 nine optional parameters, no required parameters, no output schema, and no annotations, the description is too sparse. It fails to state which parameter is the intended subject, what the tool returns, and why the unrelated parameters exist, so an agent cannot confidently invoke it correctly from the definition alone.

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 already documents each parameter; the path parameter is described as 'File path to check.' The description itself adds no parameter-level semantics and does not explain the roles of the eight other optional parameters, leaving the agent to rely entirely on the schema.

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 specific action ('Check') and resource ('a path'), and the tool name reinforces the file-path focus. However, 'looks safe' is vague and the description does not explicitly differentiate this from sibling URL/shape validators beyond the word 'path'.

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 versus alternatives such as browser-url-ok, normalize-url, or wiki-title-ok. 'No disk access' hints at a lightweight check, but it does not say when to prefer this tool or when not to use it.

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