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

No annotations are provided, so the description carries the full behavioral burden. It does add one useful trait: 'Page content is not stored,' which addresses retention. However, it does not disclose whether a network request occurs, how redirects are handled, or that the many optional parameters are discarded, so transparency is only partial.

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 short sentences with the core output front-loaded and a useful privacy note second. Every sentence earns its place, though the brevity is achieved by omitting broader guidance.

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?

For a tool with nine optional parameters and no output schema, the description is incomplete: it does not explain which parameters matter, what the return format looks like, or how this tool relates to sibling shape/URL tools. The schema covers parameter meanings but not selection or invocation strategy.

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 little beyond signaling that URL is the central input; the detailed parameter descriptions in the schema already carry the semantic weight.

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 verb ('Return') and a concrete result ('host, scheme, and HTTP status for a URL'), so the core purpose is clear. It does not explicitly differentiate from siblings like fetch-status or normalize-url, but the output trio gives enough shape for an agent to infer the main job.

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 prefer this tool over alternatives, nor any mention of exclusions or related siblings. The only usage signal is the implied case of needing host/scheme/status for a URL, which is weak for a nine-parameter tool with 27 sibling tools.

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