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

The only behavioral disclosure is 'Page content is not stored,' which is a minor safety note. There are no annotations, so the description carries the full burden. It does not explain side effects, authentication needs, rate limits, or what happens to the other parameters (e.g., city, json, path). The behavior for non-URL inputs is entirely undisclosed.

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 at two sentences with no fluff. However, it is under-specified for a tool with nine parameters and no output schema. Conciseness without completeness is not a strength; the structure is acceptable but the content is insufficient.

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 nine parameters, no output schema, and no annotations, the description is woefully incomplete. It explains only the URL case and says nothing about the remaining parameters, the response format, or edge cases. An agent cannot confidently invoke this tool for inputs other than a simple URL.

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 schema describes each parameter individually with 100% coverage, so the baseline is 3. The description adds no extra meaning about how parameters relate to the tool's function beyond mentioning 'URL.' It does not clarify which parameters are active for the stated purpose or how the others are handled, but the schema already provides basic semantics.

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 clear verb-resource pair: 'Return host, scheme, and HTTP status for a URL.' This is specific and distinct from many siblings. However, it does not mention the other eight parameters in the schema, which suggest a broader or multi-purpose function. The tool name 'citation' adds ambiguity, and the description does not clarify how the additional parameters relate to the stated purpose, making the scope unclear.

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 provided on when to use this tool versus alternatives like fetch-status, normalize-url, or browser-url-ok. There is no mention of conditions, exclusions, or alternative tools. An agent would have no basis to choose this tool over siblings that also deal with URLs and HTTP status.

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