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

With no annotations, the description carries the behavioral disclosure burden. It does usefully disclose that query and fragment are dropped, which is a real behavioral trait. However, it does not mention that other parameters appear to be irrelevant to URL normalization, whether the operation is purely local, or how invalid URLs are handled.

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 sentences, front-loaded with the primary action, and contains no filler. Every word earns its place.

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, so the description is less complete than it could be. It does not state that only 'url' is needed or that other parameters are ignored, though the schema-level descriptions partially compensate by marking several parameters as discarded. The description is adequate but leaves meaningful ambiguity.

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 coverage is 100%, so the baseline is 3. The description adds little beyond the schema: it mentions dropping query and fragment, which maps to one aspect of the 'url' parameter, but it does not clarify which of the nine parameters should actually be used or how the parameters relate to the output.

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 clearly states the tool's action: returning origin, host, and path for a URL, with query and fragment dropped. It is specific about the resource and transformation, though it does not explicitly differentiate it from URL-related siblings like domain-shape or browser-url-ok.

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 about when to use this tool versus alternatives, no exclusions, and no mention of the conditions under which an agent should choose normalize-url over sibling tools. Usage is only weakly implied by the description.

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