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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose that page content is not stored, which is useful, but it omits other important behaviors: whether it fetches the URL, what happens with the host/json/zone parameters, and the exact return structure. The description is too terse to convey the tool's full behavior.

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 sentences with no filler. It front-loads the core purpose and then adds a relevant caveat. Every word earns its place, making it concise and well-structured.

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?

There is no output schema, so the description should explain the return values and the role of each parameter. It partially does so by listing host, scheme, and HTTP status, but it fails to explain the purpose of the other parameters (host, json, zone) or how they influence the output. Given the tool's apparent complexity (4 parameters) and lack of output schema, the description is incomplete.

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 no parameter-level detail beyond the schema; it only implies that 'url' is the primary input. It does not clarify how 'host', 'json', or 'zone' affect the result, so the description provides minimal added semantic value.

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 the verb ('Return') and resource ('a URL'), and specifies the exact outputs: host, scheme, and HTTP status. It also adds a clarifying note about not storing content. However, it does not explicitly differentiate from siblings like normalize-url or status-catalog, which might have overlapping purposes.

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 its siblings. It does not mention any conditions, exclusions, or alternatives. An agent is left to infer the appropriate context solely from the tool name and description, which is insufficient given the number of similar-looking tools.

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