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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose the important fact that there is no disk access, but it never explains what the safety check verifies, whether it returns a boolean or an error, or what side effects are absent beyond disk access. This is too vague for an agent to predict behavior confidently.

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 concise and front-loaded: it states the purpose in the first sentence and adds the safety-relevant non-behavior in the second. There is no filler, though the extreme brevity leaves out important 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?

This is a simple tool, but there is no output schema and no required parameters, so the description must explain what the tool returns and how to invoke it. It does neither, nor does it specify what 'safe' means. The combination of vague description, irrelevant optional parameters, and missing return-value details makes the definition incomplete.

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?

Although schema coverage is 100%, the schema lists eight parameters unrelated to path checking, and no parameter is required. The only relevant parameter, 'path', is described only as 'File path to check', with no guidance on format, expectations, or why it is not marked required. The description itself adds no parameter meaning, and the cluttered schema makes correct invocation harder rather than easier.

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 verb and resource: 'Check whether a path looks safe.' It also adds a clarifying non-behavior, 'No disk access,' which helps distinguish it from filesystem-touching tools. However, 'looks safe' is ambiguous about what exactly is being validated, so it is not a perfect 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 alternatives such as normalize-url, browser-url-ok, or wiki-title-ok. The 'No disk access' note hints at a boundary but does not explain when this tool is preferable or what other tools should be used instead.

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