close_current_tab

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

With no annotations, the description must carry the transparency burden. It clearly discloses the destructive action and the immediate side effect of switching to the previous tab. However, it does not address edge cases such as what happens when only one tab is open, whether the browser/window may close, whether the action is undoable, or whether confirmation prompts can appear.

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. The action and its result are front-loaded, and every word contributes meaning.

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 zero-parameter tool with no output schema, the description states the trigger condition and the outcome clearly. It is close to complete for the core behavior, though additional context about single-tab behavior or browser lifecycle would make it fully robust.

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 coverage is trivially complete and there are no parameter semantics to document. The description correctly implies that the target is implicit via the current active tab, matching the parameterless interface.

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 precise verb-resource pair ('close the currently active tab') and adds the behavioral consequence ('switch to the previous one'). The target resource is clear, and the phrase 'active tab' differentiates it from sibling tools like close_browser and go_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 about when to choose this tool over close_browser, open_new_tab, switch_to_window, or go_back. There are no conditions, exclusions, or alternatives mentioned. The only usage inference comes from the tool name and the action itself.

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