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

The description mentions that query and fragment are dropped, which is a behavioral detail, but it does not disclose side effects, permissions, or error handling. The lack of annotations and the mismatched schema further obscure the tool's actual behavior.

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 itself is concise and well-structured, but the overall tool definition is cluttered by the irrelevant schema parameters. The mismatch between the description and schema detracts from the structural clarity.

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?

Given the simple purpose of URL normalization, the description lacks essential context such as expected input format, output schema, and handling of invalid URLs. The presence of unrelated parameters further reduces completeness.

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 input schema includes four parameters, but only 'url' aligns with the described purpose; 'host', 'json', and 'zone' are completely irrelevant to URL normalization. The parameter descriptions are inconsistent with the tool's function, making it highly confusing.

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 tool's function: returning origin, host, and path for a URL while dropping query and fragment. It is specific enough to understand the primary action, though it does not detail the output format or structure.

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 provides no guidance on when to use this tool versus its siblings like citation, compatibility, or timezone. There is no mention of scenarios where this tool is preferred or alternatives to consider.

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