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

With no annotations, the description carries the transparency burden. It honestly discloses that query and fragment are dropped and that only origin, host, and path are returned, which is useful behavioral detail beyond the schema. It does not cover error behavior or output formatting, but for a pure read/transform tool this is reasonably transparent.

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 sentences, no filler, and the key outcome is front-loaded. The critical behavioral caveat about query and fragment being dropped is included without wasted words.

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?

With 9 optional parameters, no required parameters, and no output schema, the description alone is insufficient for an agent to know which parameter to populate and how to interpret the result across all the unrelated-looking fields. The core output shape is named, but the ambiguous parameter space is not resolved.

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 parameters already carry most semantic weight and the baseline of 3 applies. The description adds no beyond the discard behavior, and leaves unclear which of the nine optional parameters is actually needed.

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 identifies the exact action and outcome: return origin, host, and path for a URL, dropping query and fragment. This is specific enough for an agent to distinguish it from URL-checking siblings such as browser-url-ok, playwright-url-ok, or web-fetch.

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 explicit guidance on when to use this tool rather than a sibling, no when-not-to-use statement, and no mention of prerequisites or alternatives. The description focuses on behavior, not selection context.

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