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

With no annotations, the description is the only behavior source. It discloses the important behavior that query and fragment are stripped and that it returns URL components, but it does not cover error cases, input validity, or whether any network or read-only effect exists.

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 brief but precise sentences with no filler. It front-loads the primary output and handles the dropped query/fragment in the second sentence.

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 output is clearly summarized (origin, host, path), but with nine optional parameters and no output schema the description does little to clarify which parameter is the required URL or how missing/invalid input is handled. It is adequate but not fully complete.

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 parameters are already well documented. The description adds no parameter-specific detail such as which parameter is the URL to pass, leaving the agent to rely fully on 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?

Clearly states the resource (URL) and the specific result (origin, host, path), plus that query and fragment are dropped. This distinguishes the tool from generic URL-shape checkers without needing 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?

The description implies when to use the tool: when origin, host, and path are needed and query/fragment are not. However, it does not name sibling alternatives or give an explicit when-not-to-use comparison.

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