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

With no annotations, the description carries the behavioral burden. It does disclose an important transformation (query and fragment are dropped), but it does not state whether the operation is purely local, how invalid URLs are handled, or that all parameters other than url are effectively ignored for normalization. This is partial disclosure, not full transparency.

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 a single front-loaded sentence with no filler: it states the return value first and then the key exclusion. Every word earns its place, and it is easy to scan in a tool list.

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 simple normalizer the description is usable, but with no output schema it does not specify the return shape (e.g., object keys or tuple order) or behavior for invalid/malformed URLs. The nine-parameter schema also raises ambiguity about which inputs are meaningful, and the description does not resolve that.

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 main description adds no parameter-level meaning beyond identifying URL and dropping query/fragment, but the schema's own descriptions document the parameters, albeit with many 'discarded' notes. The description could have helped by explicitly saying only 'url' is used, given the nine-parameter 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 names a specific verb ('Return') and resource ('origin, host, and path for a URL') and adds a distinguishing behavior: 'Query and fragment are dropped.' This clearly separates it from sibling URL tools like fetch-status or browser-url-ok, which imply different operations.

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 description implies when to use it: whenever an agent needs a URL reduced to origin, host, and path. However, it gives no explicit when-not-to-use guidance or alternatives, and with 27 sibling tools the agent must infer the boundary from the one-sentence behavior.

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