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

The description transparently states that no disk access occurs, which is useful. However, it does not disclose what 'safe' means, what the return value looks like, or how the many non-path parameters are handled beyond the schema's own 'discarded after' notes.

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 extremely concise and front-loads the main purpose, with no wasted words. However, it is so terse that it omits the criteria for 'safe' and any clarification of the mismatched parameter list, leaving structure adequate but content under-specified.

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?

With no output schema and no annotations, the description must carry all context. It fails to define 'safe', describe the expected return type, or reconcile the many irrelevant input parameters, making the tool's contract 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 the schema provides 100% coverage, the description adds no meaning to the parameters and the schema itself is internally inconsistent: a file-path checker has no apparent use for ref, url, city, feed, host, json, zone, or query. The path parameter is described, but the unrelated fields suggest a copy-paste template error.

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 clear verb and object ('Check whether a path looks safe') and notes no disk access, but 'looks safe' is undefined and the tool's actual schema includes many unrelated parameters (ref, url, city, zone, query), which muddies the 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 this tool rather than sibling tools such as browser-url-ok, fetch-status, or normalize-url. The only practical hint is 'No disk access', which implies a lightweight check, but no explicit conditions or alternatives are given.

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