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

Without annotations, the description carries the full burden of behavioral disclosure. It reveals that page content is not stored, which is helpful, but it fails to explain that the other 8 parameters are effectively discarded after shape checks and that this is essentially a URL-only tool. Its network behavior, side effects, and de facto ignored parameters are undisclosed.

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 compact and front-loaded, with two clear sentences that state the core behavior and a valuable non-storage detail. No wording is wasted, though the brevity does not address the tool's surprisingly large parameter surface.

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 the tool has 9 optional parameters, no annotations, and no output schema, the description is not complete enough for an agent to call the tool correctly. It fails to clarify that only the URL parameter is actually used and that the other parameters are ignored after validation; an agent might mistakenly believe all or some parameters matter for the URL check.

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 schema description coverage is 100%, so a baseline of 3 is warranted. The description adds minimal meaning beyond the schema by reinforcing that url is the relevant parameter, but it does not clarify how the other 8 parameters relate to the stated purpose, leaving ambiguity about their role.

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 a distinctive function: returning host, scheme, and HTTP status for a URL, with a specific verb ('Return') and resource. It does not, however, name or contrast any sibling tools such as fetch-status or normalize-url, so differentiation is left to inference.

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 gives no guidance on when to use this tool instead of alternatives. It does not state conditions, exclusions, or compare with siblings like browser-url-ok or web-fetch, leaving the agent to guess the appropriate context.

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