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

With no annotations, the description carries full burden for behavioral disclosure. It reveals that no browser is launched, but does not explain what 'check whether a URL can be opened' actually entails—whether it performs a network request, validates format only, or has side effects. The parameter descriptions hint at checks and discards, but the central behavior remains opaque.

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 a single, front-loaded sentence with no wasted words. It conveys the core purpose and the key exception clearly, achieving maximal efficiency.

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 9 parameters, of which the description addresses only the URL concept. It does not explain the role of other parameters like ref, city, feed, or path, leaving an agent uncertain about what inputs are appropriate. With no output schema and no annotations, the description is insufficient for an agent to fully understand the tool's scope and return value.

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 description coverage is 100%, so the baseline is 3. The tool description adds no information beyond the schema; it does not clarify which parameters are relevant or how they interplay. The schema descriptions already provide per-parameter detail, so the description adds minimal value here.

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 tool checks whether a URL can be opened, using a specific verb and resource. It also adds the negative constraint 'No browser is launched', which distinguishes it from sibling tools like playwright-url-ok. This is precise and unambiguous.

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 does not explicitly state when to use this tool versus alternatives. It implies a use case (URL check without launching a browser) but never names sibling tools or conditions for choosing it over playwright-url-ok, fetch-status, or normalize-url. No exclusions or preferred scenarios are given.

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