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

With no annotations, the description must fully disclose behavior. It does reveal that query and fragment are dropped, but it does not explain that most of the nine schema parameters appear to be ignored or discarded, nor does it clarify the relationship between the output 'path'/'host' and the similarly named input parameters. Error behavior and return format are also unspecified.

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?

Two sentences with no filler, and the primary behavior is front-loaded. The description is appropriately terse in style, though the tool's nine-parameter schema might justify a bit more detail.

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?

There is no output schema and no annotations, and the description covers only the single happy-path case of a URL. It leaves unexplained the rest of the input schema, the meaning of 'cite', the exact return structure, and what happens with invalid or non-URL input, so an agent cannot confidently call it in varied contexts.

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 baseline is 3. The description adds the URL-centric behavior but does not clarify how url relates to the other eight parameters or resolve the naming collision between output path/host and input path/host. It neither significantly enhances nor contradicts the schema.

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 names a specific verb ('Return') and a concrete resource ('origin, host, and path for a URL'), and it adds the key behavior that query and fragment are dropped. It is clear but does not contrast with sibling URL tools such as browser-url-ok or web-fetch, so it stops short of full differentiation.

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 guidance, no mention of alternatives, and no statement of what cases are excluded. An agent can infer that the tool is for extracting URL components, but the description never says when to choose normalize-url over a sibling tool.

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