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

With no annotations, the description carries the full burden of behavioral disclosure. It discloses that page content is not stored, which is useful, but it does not mention network access, side effects, or how the other parameters are handled. The schema descriptions for other params say they are discarded, but the tool description itself omits that, leaving the agent uncertain about whether passing those parameters has any effect.

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, two sentences with no wasted words. It front-loads the primary purpose and adds a behavioral note. However, the brevity omits critical context about the other parameters, making it under-specified rather than merely concise.

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 9 parameters, none required, and no output schema, the description is severely incomplete. It does not explain what happens when non-URL parameters are passed, what the output structure looks like, or how the tool relates to citations. The tool name and sibling context suggest a more complex role, but the description fails to cover it.

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 coverage is 100%, so every parameter has a description. The tool description adds no new meaning about parameters beyond the schema; it only references the URL parameter indirectly. The baseline of 3 is appropriate since the schema already documents parameters adequately, though the description could have clarified which parameter is primary.

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 and resource: return host, scheme, and HTTP status for a URL. This distinguishes it from siblings like normalize-url and fetch-status. However, it doesn't mention the other 8 parameters, and the tool name 'citation' suggests a broader purpose that is not reflected. The core action is clear, but the scope is understated.

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?

No guidance is given on when to use this tool versus alternatives. The description does not mention any conditions, exclusions, or alternative tools. With 28 sibling tools, the lack of routing guidance leaves the agent to infer usage from the vague description.

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