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 disclose a genuine behavioral trait by stating that 'Query and fragment are dropped', which is useful. However, it does not explain error behavior, output formatting, or whether HTTPS is enforced beyond the schema hint, so transparency is partial.

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 with no filler. The core purpose is front-loaded, and the second sentence adds a meaningful behavioral constraint without redundancy.

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 annotations, and no output schema, this description is too thin. It does not state the return format, error behavior, or how to handle the many parameters that appear irrelevant to URL normalization, so an agent cannot reliably predict the full result of a call.

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 input schema has 100% description coverage, with parameter-level notes such as 'discarded after the shape check', so the schema already carries most semantic weight. The description adds the context that the operation is URL-based, but it does not clarify which of the nine parameters is the primary one or how the discarded parameters interact with the call.

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 and resource: it will 'Return origin, host, and path for a URL'. It clearly states the tool's core function, but it does not explicitly differentiate it from sibling URL-oriented tools such as browser-url-ok or figma-url-shape.

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, and no mention of sibling tools. The description only implies URL normalization, leaving the selection decision entirely to inference.

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