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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does usefully state that query and fragment are dropped, but it fails to disclose how the host, json, and zone parameters are handled, what happens on invalid input, or whether unrelated inputs are silently 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 two tight sentences with no filler. The primary behavior is front-loaded, and the dropped components note is concise and useful. It earns full credit for structure and brevity.

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?

The description only addresses the url parameter while the schema exposes three additional parameters with no explanation of their relationship to the tool. There is no output schema and no annotation context, so an agent cannot confidently understand the full contract of this tool or avoid misusing it with json, zone, or host inputs.

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 even without additional parameter explanation. The description adds a little semantic value by noting that query and fragment are dropped from the URL, but it does not clarify the puzzling presence of json and zone parameters or how they relate to the tool's stated purpose.

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 action and output: returning origin, host, and path for a URL. It is not tautological and gives the agent a concrete idea of the tool's core purpose. However, it does not differentiate from sibling tools or address the unrelated-looking schema parameters, so it falls 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?

The description gives no guidance on when to use normalize-url versus alternatives like validate-json, timezone, or citation. It also does not explain the role of the host, json, and zone parameters, leaving the agent without a decision framework for selecting this tool.

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