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

The 'No disk access' statement is a valuable side-effect disclosure and is especially important because the tool carries no annotations. It tells the agent the tool is safe and won't touch the filesystem, but it leaves open the return value, error behavior, and what constitutes a 'safe' path. The description does some work, but not enough to fully carry the burden of an unannotated checker.

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 crisp sentences with no filler: the core action is stated first and the important behavioral constraint (no disk access) is immediately visible. The description is concise and well front-loaded without sacrificing its main message.

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 checker tool with no output schema and no annotations, but the schema contains nine optional parameters and the description only addresses the concept of path. An agent cannot tell if other parameters are needed or how 'safe' is determined, and the expected return/output is not explained. The description is not rich enough to stand alone for correct invocation of an otherwise unannotated tool.

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 input schema already gives descriptions for all nine properties (100% coverage), so the baseline is 3; the description adds only the notion of 'looks safe' to the 'path' parameter. It doesn't clarify whether the other eight optional properties are relevant, ignored, or mutually exclusive, so it adds minimal 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?

The description clearly names the resource (a path) and a distinctive action (safe shape check) and adds a strong scoping remark ('No disk access'), which distinguishes it from sibling URL-checking tools. It does not define what 'safe' means, and the schema lists nine optional parameters that the description doesn't map to the path concept, which leaves some ambiguity in broader tool selection.

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 explicit when-to-use, when-not-to-use, or pointer to sibling alternatives such as browser-url-ok or normalize-url. The only usage signal is 'No disk access,' which implies a purely lexical check, but the same concept could be applied to any path and doesn't narrow the choice between several similarly named validation tools. An agent is left to infer the appropriate use case 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.