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

With no annotations, the description carries the transparency burden. 'No disk access' is a helpful and meaningful behavioral disclosure: it warns that this is not a real filesystem check. Still, the description does not state what a safe vs. unsafe path means, whether it returns a boolean or throws, or whether there are other side effects, so it is only minimally transparent.

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?

Two short sentences contain only useful information: the purpose and the side-effect boundary. The statement is front-loaded and contains no filler, examples, or repetitive wording.

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?

The description is not complete enough given the large optional-parameter schema and the absence of an output schema. An agent cannot know what the tool returns on success/failure, what 'looks safe' means, or which of the nine optional parameters are relevant to the check.

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 parameters are already individually documented and the baseline is 3. The prose adds no further parameter semantics; it only indicates that 'path' is the relevant input. The large set of unrelated-looking optional parameters is not addressed in the description.

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 the resource ('a path') and states exactly what the tool does: check whether the path 'looks safe', plus the important qualifier 'No disk access.' It is clear and aligns with the tool name, and it separates a path check from URL-style siblings. It does not, however, precisely define what counts as 'safe,' so it falls short of a 5.

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 the many sibling URL/shape tools, and no mention of when not to use it. The only implication is that any path check should use this tool, which is left to the reader rather than stated.

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