browser_closeTab

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

The description discloses the automatic switch to the previous tab, which is a key behavior. However, it does not mention side effects like closing the last tab, invalid index handling, or whether confirmation is required. No annotations provide additional transparency.

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, using only two clauses to convey the action and default behavior. No unnecessary words or redundancy.

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?

The description is sufficient for a simple tab-close operation but lacks context about edge cases (e.g., single tab, invalid index) and does not mention how it interacts with other tab-management tools. It is clear but not exhaustive.

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 parameter 'index' is fully described in the schema with its default behavior. The tool description does not add extra meaning beyond the schema, so it meets the baseline for high schema coverage.

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 (closing a tab) and the resource (browser tab), and implies the default behavior of closing the current tab. It distinguishes from sibling tools like browser_newTab and browser_switchTab by focusing on the close operation.

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 explicit guidance on when to use this tool versus alternatives (e.g., when to close a tab vs. switching). The description does not mention scenarios where this is preferred or any prerequisites.

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