chrome_close_tab

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

With no annotations, the description carries the full burden of behavioral disclosure. It does not mention that closing a tab is irreversible, potentially loses unsaved state, or what happens if it's the last tab. This lack of side-effect disclosure is a significant gap for a destructive action.

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 concise sentence with no unnecessary words. It is perfectly sized for the simplicity of the action and front-loads the core purpose.

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 simple browser action with no parameters and no output schema, the description is adequate to convey the basic function. However, it lacks any context about when to use it or its behavioral impact, making it incomplete for an agent that needs to decide if this is the right tool.

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, and the schema is an empty object. The description adds meaning by specifying the target as the 'current tab,' which is implicit but helpful. Per the rubric baseline of 4 for zero parameters, this is appropriate.

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 'Close the current tab' clearly states the action (close) and the resource (current tab), distinguishing it from sibling tools like chrome_navigate or chrome_open_new_tab. It is specific and unambiguous.

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 provides no guidance on when to use this tool versus alternatives, nor does it mention any prerequisites or consequences. For example, it doesn't clarify how closing the current tab affects the browser window or the tab list.

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