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

The description adds a meaningful behavioral disclosure: 'Page content is not stored,' which is useful privacy context beyond the raw schema. However, with no annotations available, the description carries the burden of explaining side effects, network behavior, and error handling, and it does not address these dimensions.

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 very concise and front-loaded: it leads with the primary output and adds a single valuable caveat about content storage. Every sentence earns its place, and there is no filler.

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?

Despite having nine optional parameters, no output schema, and no annotations, the description only explains the URL-facing behavior. It does not clarify why parameters like ref, city, feed, json, host, and path exist, how they relate to the tool's purpose, or how this tool fits among its many URL-related siblings.

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 100% description coverage for all nine parameters, so the description does not need to repeat parameter meanings. It adds little beyond pointing at 'a URL,' but the baseline of 3 applies because the schema handles semantic documentation well.

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 the resource ('a URL'), and specifies three concrete outputs: host, scheme, and HTTP status. However, it does not distinguish this tool from closely related siblings like fetch-status or normalize-url, and the name 'citation' plus the unusually broad input schema dilute the overall clarity.

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 such as fetch-status, normalize-url, or web-fetch. It states what the tool does, but not when it is the appropriate choice, nor does it mention any exclusions or preferred conditions.

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