browser_tabs

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

Annotations already indicate destructive and non-read-only behavior, but the description adds little beyond restating the action verbs. It does not explain side effects such as which tab is closed when index is omitted, whether select changes focus, or what happens when creating a tab without a URL. Those details live in the schema, not in the description, so the description itself does not enrich behavioral transparency.

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 sentence that lists the four supported operations concisely. It is front-loaded and contains no filler, making it easy for an agent to parse quickly.

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?

The combination of the description, action enum, and parameter descriptions is adequate for basic calls. However, with no output schema, the tool does not disclose what 'list' returns, and there is no guidance about behavior when required parameters are omitted. This leaves some gaps for an agent deciding how to interpret the result.

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%, so each parameter already has a clear explanation. The description does not add extra semantic detail beyond what the schema provides, so the baseline of 3 is appropriate.

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 names a specific resource ('browser tab') and enumerates the exact operations ('List, create, close, or select'), which aligns with the action enum and distinguishes this tool from browser-level siblings like browser_navigate or browser_close. This leaves little ambiguity about what the tool does.

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 for when to use this tool rather than an alternative. For example, it does not mention browser_close as the sibling for closing the browser itself, or browser_navigate for navigation. The intended usage is only implied by the tool name and the action enum.

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