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

It discloses that page content is not stored, which is useful privacy information. It does not disclose whether a network request is made, what error behavior to expect, or any rate/access implications.

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 one focused sentence and wastes no words. It could be better structured, but it is concise and front-loaded.

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?

For a tool with nine optional parameters and no output schema, the description is too thin: it only explains one URL-related outcome and ignores the other accepted fields, result shape, and failure modes.

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 descriptions cover every parameter, but they are terse and do not explain how parameters relate to each other or whether exactly one should be supplied. With zero required parameters, the description leaves the calling convention 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 first sentence names a concrete action and scope: 'Return host, scheme, and HTTP status for a URL.' However, it does not reconcile that purpose with the nine unrelated-looking optional parameters in the schema, so the tool's actual scope feels ambiguous.

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 instead of sibling tools such as fetch-status, normalize-url, or web-fetch. The only added note is a privacy statement, not usage direction.

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