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

Annotations are absent, so the description carries full burden. It does disclose that query and fragment are dropped, which is a useful behavioral trait. However, it does not mention error handling, invalid URL behavior, or the exact return format (e.g., string vs. object), which are typical behavioral details an agent might need. It provides minimal but non-contradictory 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 zero filler. It clearly states the output and the key transformation (dropping query/fragment). This is appropriately concise and well-structured for a simple tool.

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 tool has 9 parameters and no output schema, the description is incomplete. It explains only URL normalization but does not address why other parameters exist, how results are returned, or any edge cases. The mismatch between the description and the parameter list suggests a significant gap in completeness. An agent would struggle to know how to invoke this tool correctly with so many unrelated parameters.

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 coverage is 100%, so all 9 parameters are documented in the schema itself. The description adds no parameter-specific meaning; it only mentions 'URL' generically. The schema's descriptions for parameters like 'city' and 'feed' seem unrelated to the stated purpose, but the description does not clarify their role. Baseline 3 applies because the schema handles documentation, but the description fails to enrich or reconcile the parameter list.

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 purpose: returning origin, host, and path from a URL while dropping query and fragment. It is specific with a clear verb and resource. However, it does not explicitly differentiate from sibling URL tools like browser-url-ok or playwright-url-ok, which also handle URLs, so it loses a point for lack of sibling distinction.

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?

There is no guidance on when to use this tool versus alternatives. The description merely states what it does without mentioning use cases, exclusions, or when another tool would be more appropriate. With many sibling URL-related tools, this omission is significant.

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