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

No annotations are provided, so the description carries the burden of disclosing side effects, persistence, or read-only behavior. It only describes output transformation and does not mention error behavior, failures, or whether inputs besides 'url' have 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 short and scannable, stating the core behavior in two sentences. It could be improved by listing the relevant parameter or explicitly saying that all other parameters are ignored.

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?

The tool has nine optional parameters and no output schema or annotations. The description only explains URL handling and completely omits behavior for eight parameters, making it severely incomplete for such a complex input surface.

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 descriptions cover 100% of parameters, but the tool description does not explain why unrelated parameters like ref, city, feed, json, path, zone, and query exist. The description's use of 'query' as a URL component conflicts with the schema's 'query' parameter described as search text, creating ambiguity.

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?

States a clear operation: return origin, host, and path for a URL and drop query/fragment. The name reinforces this. It loses a point because the input schema includes many unrelated parameters that the description does not reconcile with the stated purpose.

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 on when to use this tool versus sibling URL-related tools such as browser-url-ok, fetch-status, or web-fetch. It also does not explain which of the nine parameters are actually needed or ignored.

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