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

With no annotations, the description carries the behavioral transparency burden. It does disclose a meaningful non-obvious behavior: page content is not stored. However, it does not explain redirects, failures, rate limits, or how the json and zone inputs behave, leaving significant behavioral gaps.

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 fluff; the core operation is front-loaded and the second sentence adds a valuable privacy guarantee. Every sentence 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?

The description is incomplete relative to the tool's schema and sibling context. It explains only the URL-related behavior while the schema also accepts host, json, and zone, and no output schema or annotations fill in missing return/error semantics. An agent would not know how to correctly invoke the tool for the non-URL parameters or what happens if none are provided.

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 100%, and each parameter already has a meaningful description, including that JSON text is discarded after the check. The description adds no extra parameter-level detail beyond what the schema provides, 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 states a specific operation: return host, scheme, and HTTP status for a URL, which distinguishes it from siblings like normalize-url and status-catalog. However, it ignores the substantial json, zone, and host parameters in the schema, so the stated purpose is only partially complete.

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 about when to use this tool versus related siblings such as normalize-url, validate-json, or status-catalog. The privacy note about page content is not stored is useful but does not help an agent choose this tool over alternatives.

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