get_url

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

With no annotations provided, the description carries the burden of explaining behavior, and it does state that the tool returns the current URL and title, clearly implying a read-only operation. However, it gives no details on output format, error conditions (e.g., no page loaded), or whether it operates on the active tab versus the whole browser context. This is adequate but lacks richer behavioral 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 extremely concise—six words—and fully front-loaded. Every word contributes meaning, and there is no redundant phrasing or unnecessary filler.

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 parameterless getter tool with no output schema, the description provides enough information for an agent to understand what it does: it fetches the current URL and title. It does not explain return formatting or edge cases, but given the tool's simplicity, these are minor gaps rather than critical omissions.

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 description does not need to clarify parameter meanings. The baseline of 4 is appropriate because there is no parameter documentation gap to compensate for.

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 specifies the action ('Get') and the resource ('current URL and title'), making the primary function unambiguous. However, it does not explicitly distinguish itself from sibling tools like get_text, get_html, or get_viewport_size, relying on the resource name to imply the distinction.

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 about when to use this tool versus alternatives such as wait_for_url, navigate, or get_text. The description implies usage for retrieving the active page's location and title, but there are no explicit context cues, exclusions, or comparisons to siblings.

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