browser_tabs

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

No annotations are present, so the description carries the burden. It discloses that the action returns the resulting tab list, but does not discuss error handling, side effects (e.g., focus changes on close), or default behavior beyond listing. Basic transparency but incomplete.

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, fitting all essential information in a single sentence. It front-loads the action (Manage tabs) and uses parenthetical notation for parameter usage efficiently.

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 4 parameters, one (session_id) is entirely unaddressed. The output schema exists but its contents are not available to evaluate. The description fails to cover all aspects of the tool's behavior for all parameters.

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 explains that 'index' is for select/close and 'url' is optional for new, but makes no mention of 'session_id'. This leaves a parameter undocumented, reducing its utility.

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 'Manage tabs' and enumerates the specific actions (list, new, select, close), with clear purpose as a tab management tool. It distinguishes itself from sibling browser tools which handle navigation, clicking, etc.

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 implicitly indicates when to use (for tab operations) but lacks explicit when-not-to-use or alternatives. Given it's the only tab manager among siblings, this is adequate but not fully explicit.

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