zen_close_tab

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

With no annotations, the description must disclose behavior. It states 'Close a browser tab,' which implies a destructive action, but does not mention what happens if the tab is the last one, error handling for invalid IDs, or any side effects. Minimal disclosure beyond the verb.

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 very short and to the point, with the main action in the first line and an Args section. No redundant text; every sentence earns its place.

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 one-parameter tool, the description covers the basic action and parameter sourcing. However, it lacks information on error behavior (e.g., what if tab_id is invalid) or confirmation. Adequate but could be more 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?

Schema coverage is 0%, so the description must compensate. It adds value by specifying that the tab_id comes from zen_tabs, providing a clear source for the parameter. This is helpful context beyond the schema's type and requirement.

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 it closes a browser tab by ID, using a specific verb and resource. However, it does not differentiate from sibling tools like zen_detach_tab or zen_close_window, which are similar tab management operations.

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 mentions where to get tab IDs (from zen_tabs), but provides no guidance on when to use this tool versus alternatives like zen_detach_tab or zen_close_window. No explicit when-not or context is given.

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