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

There are no annotations, so the description carries the full burden. It does disclose that page content is not stored, which is useful, but it does not mention network access, auth, rate limits, or the fact that most parameters are explicitly ignored. This is minimal behavior disclosure for a tool with a side-effect-free-sounding 'return' operation.

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 just two short, front-loaded sentences: the primary action and the important behavioral guarantee about page content. There is no fluff or redundant restatement of the schema, making it appropriately concise and easy to scan.

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 tool has 9 optional parameters, no output schema, and no annotations, yet the description only covers the main action and one privacy-related detail. It lacks guidance on which parameter actually supplies the URL, ignores the other params, and offers no backstop for understanding the return format. Given the tool's complexity, this is insufficient contextual support.

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 is 3. The description adds the phrase 'for a URL', which hints at the url parameter, but it does not detail which parameter drives the action or how other inputs relate to the behavior beyond the schema's own discarded-axis notes. No negative value added, so the baseline holds.

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 specifies a clear action and output ('Return host, scheme, and HTTP status for a URL') which identifies its core purpose. It does not explicitly distinguish itself from similar sibling tools like fetch-status or normalize-url, so it falls short of a full 5.

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 provides no guidance on when to use this tool versus alternatives, nor does it mention any prerequisites or recommended contexts. The only implicit hint is the URL focus, but the agent is left to compare against siblings without explicit direction.

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