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

With no annotations provided, the description carries the full burden, and it does disclose one meaningful behavioral trait: 'Page content is not stored.' This is a useful privacy guarantee. However, it does not disclose whether the URL is actually fetched live, whether rate limits apply, whether the request follows redirects, or what happens on failure (e.g., invalid URL, timeout). The single behavioral statement is valuable but incomplete.

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 compact and front-loaded, with the primary purpose in the first sentence and a behavioral caveat in the second. Every sentence earns its place. It loses one point because the tool name 'citation' does not match the description's focus, which could confuse parsing, and the description is almost too minimal to be genuinely useful.

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?

Given 4 parameters, no annotations, and no output schema, the description should explain more about how the tool behaves, what constitutes valid input, and what the return shape is. The one-sentence description plus a privacy note is insufficient for an agent to confidently invoke this tool in a real workflow. Sibling tool names suggest overlapping functionality, but no disambiguation is provided.

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 schema already documents all four parameters. The description adds minimal meaning beyond the schema, but the schema covers the heavy lifting. The described output ('host, scheme, HTTP status') aligns with the `url`, `host`, and `status` parameters, and the description's phrase 'normalize or cite' helps contextualize the URL parameter. Since coverage is complete, a baseline of 3 applies, and the small extra context warrants a 4.

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 ('Return') and resource ('host, scheme, and HTTP status for a URL'), so an agent can infer the core function. However, the tool is named 'citation' yet the description is about URL fetching, which creates ambiguity about the intended use. It does not distinguish itself from the sibling tools like normalize-url or validate-json beyond listing a few outputs.

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 siblings such as normalize-url, validate-json, or status-catalog. The description implies a URL-checking purpose but does not state what scenarios it is appropriate for, what prerequisites exist (e.g., URL reachability), or when a sibling would be a better choice. This leaves the agent to guess.

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