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

No annotations are present, so the description carries the full behavioral disclosure burden. It does disclose one meaningful privacy trait—'Page content is not stored'—but it does not explain that the tool likely performs a network request, how failures or redirects are handled, what happens with the numerous other accepted parameters, or any rate-limit/auth concerns. This is insufficient for an HTTP-facing tool.

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 short sentences, front-loads the main purpose, and adds one genuinely useful behavioral note about content not being stored. Every sentence earns its place, and there is no redundant restating of the tool name or schema.

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 the tool has a complex nine-parameter schema, no output schema, no annotations, and many similar sibling tools, this description is too thin. It does not explain return value structure, error behavior, which parameters should actually be supplied, or how this tool differs from fetch-status or normalize-url. An agent would struggle to invoke it reliably outside a narrow URL-status case.

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 effectively 100%, with each parameter having a description, so the baseline is 3. The tool description adds little beyond identifying URL as the relevant input; it does not clarify the roles of the other decoy parameters or the inconsistent host/path descriptions. Since the schema already documents each parameter, the description is not required to restate them, but it also does not compensate for the overall confusion.

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 action and result: 'Return host, scheme, and HTTP status for a URL.' This clearly identifies the resource and the output fields, and the added note that page content is not stored helps separate it from general fetch tools. However, it does not reconcile the tool name 'citation' with the many unrelated schema parameters, so some ambiguity remains.

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 like fetch-status, normalize-url, web-fetch, or browser-url-ok. The description implies URL checking/citation but does not state conditions, exclusions, or alternatives. An agent must infer the appropriate context from the name and schema alone.

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