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

No annotations are provided, so the description carries the full burden. It discloses the transformation (returns origin/host/path, drops query/fragment) which is helpful. However, it does not mention edge cases like invalid URLs, whether the operation is read-only, or any potential side effects, though for a normalization tool this is minor.

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, concise sentence with no redundancy. It front-loads the main output and efficiently covers the key behavior. Every word earns its place.

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 schema contains 9 parameters, many seemingly unrelated to URL normalization (city, json, zone, etc.). The description does not clarify that only the 'url' parameter is needed or that the others are ignored. It also does not specify the output format beyond the three components. An agent could be confused about which parameters to supply, making this incomplete for a tool with such a broad schema.

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 each parameter has a description. The tool description adds no extra meaning beyond the schema, and does not clarify which of the 9 parameters are relevant for the URL normalization (only 'url' seems applicable). The baseline of 3 is appropriate given the high schema coverage, but the description could have clarified the role of the extra parameters.

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 ('Return'), the resource ('URL'), and the specific outputs ('origin, host, and path'), while also specifying what is dropped ('Query and fragment'). This precisely distinguishes the tool from siblings like browser-url-ok or web-fetch, which have different purposes.

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 usage: if an agent needs URL components, it should use this tool. However, it does not explicitly mention alternatives or when not to use it. With many sibling tools present, explicit routing would strengthen guidance, but the purpose alone makes the usage context reasonably clear.

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