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

The description adds a useful behavioral detail: query and fragment are dropped. Since no annotations are provided, this partially compensates for the lack of structured safety or side-effect hints. However, it does not disclose how invalid URLs are handled, whether only the 'url' parameter is used while others are ignored, or any other side effects.

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 extremely concise: two sentences, with the primary function stated first and a key behavioral caveat immediately after. There is no redundant wording or low-value filler.

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?

Given nine optional parameters, zero required parameters, no annotations, and no output schema, the description is too sparse to fully support correct invocation. It does not explain how the returned origin, host, and path are formatted, whether the other parameters are ignored, or what happens with invalid input.

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 clarifies that the URL's query and fragment are dropped, but it does not help an agent decide which of the nine optional parameters are relevant. It adds no parameter-level meaning beyond what the schema already provides.

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 verb and resource: 'Return origin, host, and path for a URL.' It also specifies a key behavior, dropping query and fragment. However, it does not explicitly distinguish itself from sibling URL-related tools such as browser-url-ok or domain-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?

No guidance is provided about when to use this tool versus the many sibling tools, nor are any alternatives named. The intended context must be inferred from the function name and general phrase 'for a URL,' so an agent has little support in choosing it over similar URL-handling tools.

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