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 usefully states that there is no disk access, indicating a side-effect-free check. However, it does not explain what 'safe' means, what criteria are evaluated, or what the tool returns.

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 two short sentences with no wasted words. The core action is front-loaded, and 'No disk access' adds an important behavioral qualifier efficiently.

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 has no output schema and no annotations, yet the description does not explain the result format or the meaning of 'looks safe'. With nine optional parameters and several sibling validation tools, an agent would need more context to invoke this tool confidently and interpret its response correctly.

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 has 100% parameter description coverage, so each parameter already has its own explanation. The description itself adds little parameter-level meaning beyond identifying 'path' as the core input, which is sufficient given the schema coverage.

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 states the verb and resource: it checks whether a path looks safe. It also adds a distinguishing trait, 'No disk access', which sets it apart from tools that actually interact with files or URLs. However, 'looks safe' is somewhat vague and does not specify what kinds of path safety are considered.

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 explicit guidance on when to use this tool versus alternatives like browser-url-ok, normalize-url, or wiki-title-ok. 'No disk access' implies it is a safe, lightweight check, but the description does not state when it should be preferred or when it should be avoided.

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