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

It does disclose a real behavioral trait: query and fragment are dropped. However, with no annotations, the description does not mention accepted URL scheme, output format, error behavior, or how the many unrelated schema parameters are handled, leaving significant behavioral gaps.

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 sentences with no filler. The core output and the key transformation are front-loaded, making the description easy to parse quickly.

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?

For a tool with 9 parameters, no annotations, and no output schema, this description is too thin. It does not explain why parameters like city, json, feed, or zone exist, which are ignored, or what the return value looks like, so an agent cannot fully understand the tool's actual contract.

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 baseline is 3 even though the description adds little parameter-specific meaning. The description's 'query' wording is slightly ambiguous against the schema's 'Search text; discarded after the length check' description, but it does not actively mislead enough to lower the score.

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 states a specific operation ('Return origin, host, and path') on a clear resource ('a URL') and adds a concrete normalization behavior (query and fragment are dropped). This clearly distinguishes it from sibling URL checkers like browser-url-ok or fetchers like web-fetch, even without naming them.

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 gives no guidance on when to use this tool versus alternatives, and it does not mention exclusions or prerequisites. An agent must infer the use case from the name and behavior alone.

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