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

Annotations are null, so the description carries the behavioral disclosure burden. It does disclose the important trait that no disk access occurs, which is valuable. However, it does not mention whether the check is purely syntactic, whether inputs are discarded, or what the result/error behavior is.

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, each earning its place: the first states the action, the second states a critical constraint. There is no filler or redundant restatement of the tool name.

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 tool exposes seven heterogeneous parameters and has no output schema, yet the description is only two sentences. It leaves unspecified which parameters are required, what 'looks safe' means, and what response form an agent should expect.

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 description adds little per-parameter meaning, but the input schema already provides descriptions for all seven parameters, including discard behavior for ref, json, and feed. With high schema coverage, a baseline of 3 is appropriate.

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 and resource: 'Check whether a path looks safe,' and immediately clarifies a key boundary with 'No disk access.' It clearly points to file-path validation rather than URL or domain checks, though it does not explicitly differentiate itself from sibling shape-check tools.

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 guidance on when to use this tool versus alternatives such as browser-url-ok, wiki-title-ok, or domain-shape. It also does not define what 'safe' means or what kinds of paths are valid, leaving the usage decision mostly to inference from the tool name.

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