close_tab

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

With no annotations provided, the description carries the full burden of behavioral disclosure but states nothing. It does not indicate whether closing a tab is destructive, how unsaved state is handled, or whether the optional index defaults to the active tab.

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 short, but its brevity reflects under-specification rather than effective conciseness. It fails to include necessary context for a tool with an optional parameter, so the two-word phrase does not earn its place as adequate documentation.

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?

Given a browser automation tool with one optional parameter, no annotations, and no output schema, the description is completely incomplete. It does not explain which tab is closed, what happens if index is omitted, or any side effects, making it inadequate for correct invocation.

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?

Schema description coverage is 0% and the description does not mention the 'index' parameter at all. It provides no meaning, format, or constraint information for the single parameter, leaving it completely undocumented.

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 tab' is a verbatim restatement of the tool name, making it tautological. While the underlying action is clear, the description adds no distinguishing detail beyond the name itself, so it falls into the tautology category.

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?

There is no guidance on when to use this tool versus alternatives like switch_tab or new_tab, nor any mention of prerequisites or context. The description provides no usage instructions at all.

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