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

The description usefully discloses that query and fragment are dropped, which is behavior beyond the schema. However, with no annotations, it does not clarify that the other schema fields appear irrelevant to URL normalization or whether the operation is purely local and read-only.

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 concise and front-loaded: two short sentences with no filler. It earns its place by stating the main behavior, though the noisy schema would benefit from a small amount of clarifying detail.

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 9 optional parameters, no output schema, and no annotations, the description is incomplete. It does not say which parameter to supply, what the return structure looks like, or how this tool relates to the many URL-related siblings, so an agent is under-equipped to invoke it confidently.

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 real parameter-level meaning and the mention of dropping query could be confused with the schema's unrelated 'query' parameter, but each parameter is individually described in 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?

The description states a specific verb and resource: it returns the origin, host, and path for a URL. This makes the core action clear and helps distinguish it from fetching or checking tools, though it does not explicitly name alternatives.

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 siblings like browser-url-ok, domain-shape, or web-fetch. No exclusions or alternative conditions are provided; usage context is only implicit from the stated output.

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