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

No annotations are provided, so the description must carry the behavioral burden. It does disclose a meaningful behavior: URL query and fragment are dropped. However, it does not state whether the tool makes network requests, whether it has side effects, or how the many non-URL schema parameters are treated beyond what the schema already says.

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 only two sentences, front-loads the main purpose, and follows with a useful caveat. Every word earns its place and there is no redundant or filler content.

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?

With 9 optional parameters, no output schema, no annotations, and multiple sibling URL tools, this sparse description is not complete enough for reliable invocation. It does not identify 'url' as the operative parameter, does not clarify that most other parameters are discarded, and leaves the output shape and side-effect profile underspecified.

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 some context by clarifying that the URL's query/fragment are not included in the result, but it does not explain parameter relationships or provide usage details. The potential clash between the 'query' schema parameter and the URL query mentioned in the description adds slight ambiguity.

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 a specific operation and result: 'Return origin, host, and path for a URL' and adds a key transformation ('Query and fragment are dropped'). It is easy for an agent to understand what the tool does, but it does not explicitly distinguish itself from sibling URL tools like browser-url-ok or fetch-status, so it stops short of a 5.

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 versus the many sibling URL-related tools. The statement about dropping query/fragment implies one use case, but no alternatives, exclusions, or prerequisites are mentioned. An agent selecting among normalize-url, browser-url-ok, fetch-status, and domain-shape gets no help.

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