get_current_url

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

With no annotations, the description carries full responsibility for behavioral disclosure. It does not mention side effects, prerequisites (e.g., an open page), error conditions, or return format. The description is a bare statement of the action without any added context.

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, focused sentence without any filler or redundancy. It is front-loaded with the key information and is appropriately sized for a simple getter tool. Every word adds value.

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?

While the tool is simple and the output schema exists, the description omits any context about the runtime environment (e.g., requiring an active page) or potential failure states. It is minimally adequate but lacks explicit completion of the usage context that an agent might need to call it correctly.

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 tool has zero parameters, so the schema is trivially 100% covered. The description correctly implies no parameters are needed. According to the baseline for zero-parameter tools, a score of 4 is appropriate since the description aligns with the schema and adds no ambiguity.

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 action (get) and the resource (URL of current page), making it unambiguous and distinct from siblings like get_title or get_page_source. It precisely names what the tool returns without ambiguity.

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 provided on when to use this tool versus alternatives or when not to use it. The description only states what it does, leaving the agent to infer context. Unlike the sibling tools, no explicit routing or exclusions are given.

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