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

With no annotations, the description must carry behavioral disclosure, and it provides only 'No disk access.' It does not explain what 'looks safe' means, whether the call returns a boolean or throws, whether it normalizes paths, or whether the other schema properties are ignored, so the behavior remains largely opaque.

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 short sentences with no filler, and the main action plus the key side-effect qualifier are front-loaded. It is appropriately compact for a simple check, though its brevity leaves behavioral gaps that are penalized in other dimensions.

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?

There is no output schema and no annotations, so the definition should cover what the check returns and what 'safe' means, but it does not. The broad optional input schema and absence of a required parameter also make it incomplete: an agent cannot tell whether to pass only `path`, multiple fields, or none.

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% and each property has a descriptive comment (e.g., 'File path to check; no disk access'), so the description does not need to restate parameter meanings. The main gap is that the description does not clarify that `path` is the relevant parameter among many optional fields, but the schema itself is informative enough to keep this at baseline.

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 names a concrete action ('Check whether a path looks safe') and a clear resource, with 'No disk access' adding useful scope. However, the input schema exposes several unrelated optional properties (ref, url, city, feed, host, json, query), so the description does not make clear that `path` is the effective input, creating ambiguity about the actual purpose.

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 on when to use file-path-ok versus alternatives, nor any exclusion such as 'use a filesystem tool if you need existence checks.' The only contextual signal is 'No disk access,' which weakly implies a non-filesystem validation but does not state when this check is appropriate.

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