get_current_url

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

No annotations are present, so the description must carry behavioral disclosure. It reveals the platform-dependence caveat but does not describe error behavior, device handling, or what happens if the URL is unavailable.

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 sentence with no filler, making it structurally efficient. However, it omits parameter semantics, so it is somewhat under-specified despite its brevity.

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?

An output schema is present, likely covering return values, and the tool is conceptually simple. Still, the missing parameter explanation and lack of usage guidelines leave notable gaps for an agent, though not severe enough to be considered inadequate for a simple getter.

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 only required parameter, device, has no schema description and the tool description does not mention it. With schema description coverage at 0%, the description fails to compensate, leaving the parameter entirely unexplained.

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 retrieves the current browser URL, with a caveat about platform exposure. It is specific and unambiguous, but it does not explicitly differentiate from sibling browser tools such as open_url or browser_back.

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?

No guidance is given on when to prefer this tool over alternatives or when not to use it. The phrase 'when the platform exposes it' is a technical precondition rather than a usage guideline.

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