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

With no annotations, the description carries the behavioral disclosure burden. It discloses that query and fragment are dropped, which is useful. However, it does not explain how the additional schema parameters (host, json, zone) behave, nor does it mention error handling or whether the operation is side-effect free beyond the implicit 'Return' wording.

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?

Two short, direct sentences with no filler. The main purpose is front-loaded, and the second sentence adds a clear behavioral caveat. This is an appropriately sized description for a simple tool, though it may be incomplete due to schema mismatches.

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 tool has four optional parameters and no output schema, yet the description only explains the URL-related behavior. The purpose of 'host', 'json', and 'zone' is left entirely unexplained, and the return structure (object shape, formatting) is not described. This is insufficient for reliable tool selection and invocation.

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?

The schema descriptions cover all four parameters (100% coverage), so the baseline is 3. The tool description adds no additional parameter meaning, and it actually creates confusion by describing only the 'url' behavior while the schema also supports host, json, and zone.

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 uses a specific verb ('Return') and resource ('URL'), and clearly states the expected output (origin, host, path). It is not a tautology and does not reference sibling tools, so it misses the top score by failing to distinguish itself from alternatives.

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?

No when-to-use advice or explicit alternatives are provided. The note that query and fragment are dropped is an output constraint, not guidance on when to select this tool over others. The sibling tools are not mentioned, leaving the agent without routing direction.

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