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

The description adds a useful behavioral guarantee: page content is not stored. With no annotations available, this helps the agent understand privacy and side-effect expectations. Still, it does not disclose whether a network request is made, whether inputs are retained, or what the exact return shape is beyond the three headline fields.

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 concise and front-loaded: the primary output is stated first, and the privacy caveat follows in a tight second sentence. It has no filler, though it is terse relative to the large optional parameter set.

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 multi-parameter optional tool with no output schema, this description is incomplete. It does not explain the role of the many non-URL parameters, what 'citation' means in this context, or how results are returned. The non-storage note is useful but does not fill the gap.

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 input schema already provides descriptions for all parameters, so the baseline is 3. The tool description only references 'a URL' and adds no extra meaning for parameters like ref, city, feed, host, json, or path. It does not contradict the schema, but it also does not help the agent reason about which parameters are relevant for a given call.

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 concrete verb and resource: return host, scheme, and HTTP status for a URL. It is not a tautology and gives the agent a specific sense of the tool's output. However, it does not explicitly differentiate from sibling tools like fetch-status or normalize-url, which may also operate on URLs.

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 on when to use this tool versus fetch-status, normalize-url, web-fetch, status-catalog, or other URL-related siblings. The 'page content is not stored' note is a behavioral statement rather than a usage condition or alternative-selection heuristic.

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