Close Safari Tab

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

Annotations already declare the tool destructive and non-read-only, and the description adds no additional behavioral context beyond the plain action. It doesn't mention consequences of closing a tab (e.g., unsaved data, irreversibility) or error handling. Since annotations cover the safety profile, the low score reflects that the description contributes nothing beyond annotations.

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?

A single, direct sentence with no filler. Perfectly concise for the action it describes.

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 tool has two optional parameters and no output schema; annotations provide safety context. The description is minimal but works in combination with the schema. However, it lacks explicit mention of default behavior (e.g., 'if omitted, closes current tab') which is only in the schema, and no usage guidance is given. This is a minimum viable description.

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?

The input schema provides complete descriptions for tabIndex and windowIndex (100% coverage), so the description doesn't need to explain them. The baseline is 3 because the description adds no additional meaning beyond the schema.

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 'Closes' and resource 'Safari tab', clearly distinguishing the action from sibling tools that list or open tabs. It directly states 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?

The description provides no guidance on when to use this tool versus alternatives, nor any prerequisites or behavioral notes. It simply states the action. The schema mentions optional parameters but the description doesn't explain usage context.

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