zerodom_close_tab

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

With no annotations, the description carries the behavioral burden. It discloses the default-active behavior and the last-tab refusal, which are valuable. However, it does not state what happens on failure, whether closing is irrevocable, or how tab_id resolution behaves, leaving some behavioral gaps.

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 whole description is one tight sentence with no filler. The verb and primary behavior are front-loaded, and the last-tab guardrail is added economically.

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 single-optional-parameter tool with an output schema, the description is largely sufficient: it names the action, the default, and the key edge case. Minor omissions like error behavior on invalid tab_id are not likely to block 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%, so the description must compensate. It explains the default-null behavior ('active one by default'), which helps. But it never explicitly states that tab_id identifies a specific tab to close or where to obtain a valid tab_id, so the parameter semantics remain partially implicit.

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 specific verb and resource: 'Close a tab', and adds the default-active-tab behavior. The guardrail 'Refuses to close the last tab' makes it clearly distinct from siblings like new_tab, switch_tab, and list_tabs.

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?

Clear context is given: this closes a tab, defaults to the active one, and will not close the last tab. It does not explicitly name alternatives like switch_tab or new_tab, but the usage is unambiguous for a tab lifecycle tool.

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