browser_tabs

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

The description does not contradict the annotations (destructiveHint: true, readOnlyHint: false) and lists actions that align with those hints. However, it adds no extra behavioral context beyond what annotations and schema already provide, such as what happens when 'index' is omitted or how 'list' returns data.

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 a single concise sentence that lists all supported operations. It front-loads the core purpose and contains no fluff or redundant detail.

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?

While the schema and annotations provide solid coverage of parameters and safety hints, the description is thin on operational details like return formats, edge cases for 'index', and what 'select' does exactly. There is no output schema to fill this gap. The tool is simple enough to function, but not richly specified as a whole.

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 100%, meaning all three parameters are already documented with descriptions in the schema. The description adds no additional parameter meaning beyond restating the action names, so the baseline score of 3 applies.

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 resource (browser tab) and specific actions (list, create, close, select). This distinguishes it from sibling tools that handle navigation, clicking, or snapshots. The verb+resource structure makes the tool's purpose unmistakable.

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 guidance is given on when to use this tool versus alternatives like browser_navigate or browser_snapshot. There are no prerequisites, exclusions, or explicit context suggesting typical use cases beyond the bare action list.

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