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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does add one useful privacy trait ('Page content is not stored'), but it does not disclose whether the tool makes network requests, what side effects occur, how json/zone inputs behave, or any rate/auth limitations. This is insufficient for a tool with no annotation coverage.

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 concise sentences with the core behavior front-loaded and no filler. The privacy note is relevant and earns its place. However, the brevity is achieved by omitting the json/zone behaviors, making it concise but incomplete.

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 and no annotations, and the description covers only the URL-related behavior. The tool accepts four parameters spanning URL, host, JSON, and timezone, but the description gives no context for json/zone or how they relate to 'citation'. An agent cannot determine whether this tool overlaps with validate-json or timezone.

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, but the description actively undermines parameter clarity by listing 'host' as an output while the schema defines it as an input. It also ignores json and zone entirely, so an agent cannot infer their roles from the description. This ambiguity prevents the description from adding value beyond the schema.

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 operation ('Return host, scheme, and HTTP status for a URL') and adds a privacy note. However, the input schema includes json and zone parameters that the description ignores, so the stated purpose is incomplete and may mislead an agent about the tool's full scope. It also does not differentiate the tool from siblings like normalize-url or status-catalog.

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 siblings such as normalize-url, status-catalog, validate-json, or timezone. The description implies URL checking but provides no selection criteria, exclusions, or alternative routing.

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