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

No annotations are provided, so the description carries the behavioral burden. It does disclose that query and fragment are dropped, which is a meaningful behavioral trait, but it does not say whether the tool performs network access, how invalid URLs are handled, or whether only the 'url' parameter is actually used.

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 two crisp sentences with the core behavior front-loaded and no filler. The query/fragment caveat earns its place as a natural 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?

Despite the clear core statement, the tool has 9 optional parameters, no output schema, no annotations, and many sibling tools. The description does not explain the return structure, whether 'url' is the only meaningful parameter, or what happens with invalid input, so an agent cannot confidently invoke it correctly.

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 meaning to the 'url' parameter by defining the expected output, but it does not clarify the role of the eight other optional parameters, several of which are explicitly described as discarded.

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 the verb and resource: 'Return origin, host, and path for a URL' and adds the key lossy behavior that query and fragment are dropped. It does not explicitly contrast any sibling tools, 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?

The usage is implied: use this when you need normalized URL components and do not need query or fragment. However, there is no explicit when-not guidance or pointer to alternatives like web-fetch, browser-url-ok, or fetch-status, which would be valuable given the large sibling set.

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