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

With no annotations, the description must carry the behavioral burden. It does disclose a key transformation (query and fragment are dropped) and implies a read-only extraction by saying 'Return'. It does not mention invalid URL handling, error cases, or whether any network access occurs, but for a simple normalizer this is partial rather than absent.

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 short sentences with no filler. The main output is front-loaded, and the additional behavioral note 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 absence of annotations and output schema, combined with a large set of mostly irrelevant optional parameters and no sibling differentiation, leaves the agent without enough context to know the return structure or to be certain only `url` matters. The core idea is present, but the surrounding context is not adequately resolved.

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 no parameter-specific details, but the schema already identifies `url` as the URL to normalize and marks the other parameters as discarded. The overlap between output names and input names (`host`, `path`) is mildly confusing but not actively misleading.

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 states a specific operation: return origin, host, and path for a URL, and it adds a concrete behavioral detail about dropping query and fragment. This is clear and not a tautology, but it does not explicitly contrast with URL-related siblings like web-fetch or browser-url-ok, 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 guidance on when to use this tool instead of the many URL-related siblings, no exclusions, and no prerequisites. The intended use is only implied by the tool name and the output description.

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