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

Annotations already declare readOnly=false, destructive=true, idempotent=false, and openWorld=true. The description usefully clarifies that the tool changes visible UI state without deleting child items, which softens the destructiveHint concern, but it does not explain repeated-collapse behavior, prerequisites, or effects on selection/focus.

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 two front-loaded sentences with no wasted language. The first sentence states purpose and usage, and the second adds a key behavioral caveat.

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 that annotations cover the safety profile, the schema fully documents parameters, and an output schema exists, the description is largely complete. It explains what the tool does and that it does not delete children, though it could mention prerequisites such as requiring an expanded node.

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 all nine parameters are already documented in the schema. The description adds no parameter-specific guidance beyond the schema and relies entirely on structured fields for id, app, pid, name, role, label, device, window_title, and automation_id.

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 states a specific verb and resource: collapse an identified native Accessibility/UI Automation tree node or disclosure control. It is clear and concrete, though it does not name the sibling tool ui_expand or otherwise differentiate from nearby collapse/expand 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 phrase 'Use this to collapse...' gives an implied usage context, and 'identified' signals that a target reference is required. However, it does not state when not to use it, nor does it route the agent to alternatives such as ui_expand or computer_collapse.

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