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

With no annotations provided, the description carries the behavioral burden. It adds the useful privacy-related trait that page content is not stored, implying a non-retaining read operation. Still, it does not disclose details such as whether the URL is fetched live, how redirects or errors are handled, or what happens to the other schema parameters.

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 that front-load the core purpose and add a useful caveat. Every sentence earns its place, and there is no redundant or vague filler.

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?

Despite being concise, the tool has nine parameters, no output schema, no annotations, and many closely related sibling tools. The description does not clarify how to handle the extra parameters or what the exact return shape looks like, leaving an agent uncertain about correct invocation.

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%, so the baseline applies. The description adds minimal parameter-specific meaning beyond identifying URL as the core input; the many discardable parameters are only explained inside the schema itself.

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 concrete operation: return host, scheme, and HTTP status for a URL. It is specific about the resource and output, and the 'page content is not stored' caveat adds useful distinction from content-fetching tools. However, it does not explicitly differentiate from URL-focused siblings 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 given about when to use this tool versus alternatives, and the description does not mention exclusions or prerequisites. The only hint is 'for a URL', which is too weak to route an agent among many similar sibling tools.

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