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

The description discloses that page content is not stored, which is a useful transparency note. However, it does not mention other side effects such as a network request, redirect behavior, or whether any state is modified, and there are no annotations to fill that gap.

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 short and direct, with no redundant phrasing. The two sentences pack the core behavior and a meaningful privacy guarantee into a compact, easily parsed form.

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 nine optional parameters and no output schema, the description is incomplete. It does not specify the return format or error behavior, nor does it explain how to choose among the many optional parameters, so an agent would need additional information to call it confidently.

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 descriptions for all nine parameters, so the baseline is met, but the tool description only references the 'url' parameter. It does not explain whether the other eight parameters are ignored, alternatives, or mutually exclusive, leaving their semantics unclear.

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 action and output ('Return host, scheme, and HTTP status for a URL'), so the core purpose is clear. It could be stronger by distinguishing it from sibling tools such as fetch-status or normalize-url, but the action is 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?

No guidance is given about when to use this tool rather than sibling tools, and no alternatives or exclusions are mentioned. The privacy note ('Page content is not stored') hints at safety but does not provide usage direction.

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