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

With no annotations, the description carries the behavioral burden, and it does disclose the primary behavior: output fields and the dropping of query strings and fragments. However, it does not explain what happens with the other accepted inputs such as city, feed, json, path, or ref, nor how multiple inputs interact.

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-loaded with the action and output, followed by the key transformation. Every sentence earns its place and there is no filler or duplication of schema text.

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 exposes nine optional parameters, has no output schema, and no annotations, yet the description only covers the URL normalization path. It is adequate for a simple single-url call, but it does not explain what happens when other parameters are supplied, how the returned components are structured, or when to choose this tool over its many siblings.

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 structured data already carries most parameter meaning. The description adds useful context for the url parameter by specifying that query strings and fragments are dropped, but it does not clarify the role of the remaining optional parameters.

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 concrete action and output: returning origin, host, and path for a URL, which distinguishes it from sibling URL checkers. It is not a 5 because it ignores the 'or cite' behavior hinted at in the url parameter description and the unrelated optional parameters in the schema.

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 explicit when-to-use or when-not-to-use guidance, and no alternative sibling tool is named. The intended usage must be inferred from the tool name and output phrase, which is risky given the nine optional parameters and many related URL tools.

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