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

With no annotations, the description must carry behavioral disclosure; it does add one useful guarantee ('Page content is not stored') and implies a read-only status check. However, it does not state that the tool performs a network request, what happens for invalid or missing URL, or how the host/scheme/status are returned.

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?

Two front-loaded sentences, no filler: the result is stated first and the privacy caveat second. Every word earns its place.

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?

Given nine optional parameters, no output schema, no annotations, and many overlapping siblings, this description is too thin. It omits which fields to use or ignore, invocation context, and error or return behavior, so an agent cannot confidently select and invoke it correctly.

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 coverage is 100%, so the parameter descriptions already carry the meaning; the tool description adds only the link between URL and the returned host/scheme/status. It does not explain how the other eight parameters relate to the stated purpose, which is acceptable only because the schema documents them.

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 names a concrete operation—return host, scheme, and HTTP status for a URL—and adds a privacy statement. It is clear about what the tool does but does not differentiate it from siblings such as fetch-status, normalize-url, or web-fetch.

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?

There is no guidance on when to use this tool instead of the many URL-related siblings, and no mention of which parameter(s) to pass among the nine optional fields. The only implicit hint is that it expects a URL.

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