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

With no annotations, the description carries a heavy burden. It does disclose one useful behavior—query and fragment are dropped—but it does not mention error handling, URL validation rules, or whether any network or side effects occur. This is a partial, not complete, behavioral disclosure.

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 with no filler. The core purpose is front-loaded, and the key transformation ('Query and fragment are dropped') is stated in the second sentence. 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 is nontrivial with seven parameters, several marked as 'discarded', and there is no output schema or annotations. The description does not explain return format, failure behavior, or why multiple seemingly unrelated parameters exist, leaving an agent uncertain about safe invocation.

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 high since every parameter has a description, so the baseline is 3. The description clarifies that 'url' is the primary input, but it does not explain the unrelated parameters such as 'ref', 'city', 'feed', and 'json', nor the surprising presence of 'host' and 'path' as inputs alongside being outputs.

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 uses a specific verb ('Return') and identifies the resource ('origin, host, and path for a URL'). It also adds a distinguishing behavior ('Query and fragment are dropped'), which separates it from generic fetch or validation tools, though it does not explicitly compare against named siblings.

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 when-to-use or when-not-to-use guidance, and no alternatives are named. The description implies it is appropriate when normalized URL components are needed, but it leaves the decision to the agent without stating exclusions.

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