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

With no annotations, the description carries the transparency burden. It does disclose an important behavioral guarantee ('No disk access'), but it does not state return value, error behavior, or whether the check covers traversal, absolute paths, or other safety properties.

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 only two sentences, front-loaded with the core purpose and a key behavioral constraint. There is no filler or redundant content.

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 is contextually complex due to nine optional parameters and no output schema, but the description covers only the path aspect and leaves the other parameters unexplained. It also does not describe what the tool returns, making it incomplete for an agent to use confidently.

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%, so the baseline is 3; each parameter already has a description, and the path parameter description explicitly ties to the tool's purpose. However, the tool accepts many seemingly unrelated optional parameters (url, city, json, zone, etc.) and the main description does not clarify their relationship to path checking, so the description adds little semantic value beyond 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?

Description names a clear action ('check') and resource ('path'), and the phrase 'looks safe' plus 'No disk access' distinguishes it as a syntactic shape validator rather than an actual filesystem access tool. It could be more specific about what 'safe' means, but it is distinct from sibling URL/domain/wikipedia checkers.

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 provides no explicit when-to-use or when-not-to-use guidance, and it does not mention alternatives such as browser-url-ok or domain-shape. The only contextual hint is 'No disk access', which indirectly implies it will not verify real file state, but this is not developed into usable usage guidance.

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