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

With no annotations, the description carries the full behavioral burden. It discloses that query and fragment are dropped, but it does not state behavior for invalid URLs, whether network access is involved, what happens if no parameters are provided, or that many schema parameters appear unrelated and may be ignored.

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 brief, front-loaded, and free of filler. It loses a point because the brevity is not matched to the schema's real complexity: it omits scope details that the interface makes necessary.

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 optional parameters, no required parameters, no output schema, and no annotations, this description is incomplete. It does not define the expected input contract, return shape, failure behavior, or how the extra schema fields should be treated.

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%, but the description adds no clarity about the nine-parameter interface and conflicts with the schema's implication that `url` can be used to 'normalize or cite.' The description only adds URL-component behavior, leaving the roles of `city`, `json`, `zone`, `query`, and the 'discarded' fields ambiguous.

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 is specific: it names the operation ('Return origin, host, and path') and the resource ('a URL'). However, it does not distinguish this tool from sibling URL-related tools or clarify why the schema exposes eight seemingly unrelated optional parameters.

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 normalize-url versus siblings like browser-url-ok, web-fetch, fetch-status, or citation. The description implies a URL-normalization use case but gives no exclusions, prerequisites, or explicit routing hints.

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