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

The phrase 'Page content is not stored' adds meaningful behavioral context, especially since no annotations are present. However, it does not disclose redirect handling, timeout behavior, failure modes, or whether other inputs are retained, leaving part of the burden unmet.

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 filler. The core purpose is front-loaded, and every word contributes to understanding what the tool does.

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 seven optional parameters, no output schema, and no annotations, the description only conveys the primary URL-related behavior. It does not clarify how the other parameters relate to the tool or when it should be chosen over sibling tools.

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 high, and each parameter already has an explanatory description. The tool description adds no additional meaning beyond those structured descriptions, so the baseline score of 3 is appropriate.

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 uses a specific verb, 'Return', and names concrete outputs: host, scheme, and HTTP status for a URL. It is more useful than a tautology, though it does not explicitly differentiate itself from sibling tools like fetch-status or normalize-url.

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 provided about when to use this tool versus related siblings such as web-fetch, normalize-url, or fetch-status. The description does not state exclusions, prerequisites, or context in which citation is preferred.

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