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

With no annotations, the description carries full responsibility for behavioral disclosure. It only reveals that no browser is launched; it does not state whether an HTTP request is made, what the return value looks like, or whether side effects such as network requests or rate limits apply.

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 very short, front-loaded, and contains no filler. Every word earns its place, though the extreme brevity contributes to a broader lack of context.

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?

There are no annotations, no output schema, and seven heterogeneous parameters. The description is too thin for an agent to confidently understand what 'can be opened' means, how results are reported, and how the many optional parameters relate to the operation.

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 includes descriptions for all seven parameters, so schema coverage is high. The tool description itself adds no parameter-level meaning and does not explain why unrelated-looking fields like city, ref, or json are accepted, so the baseline score applies.

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 operation: check whether a URL can be opened, and adds the important trait that no browser is launched. This helps distinguish it from browser-launching siblings such as playwright-url-ok, though it does not explicitly name alternatives.

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?

'No browser is launched' implies a lightweight reachability check rather than a full browser test, so usage context is somewhat clear. However, it never explicitly says when to prefer this tool over playwright-url-ok, web-fetch, or fetch-status, nor does it list exclusions.

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