Apple Control Frontmost App

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

Annotations already provide openWorldHint, idempotentHint, and destructiveHint, so the description needs to add behavioral context beyond those flags. 'Bounded GUI fallback actions' hints at constraints, but the description does not disclose what actions are allowed, what side effects GUI manipulation may have, or any permission or accessibility prerequisites. This leaves an agent uncertain about the tool's actual behavior.

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 single sentence is concise and contains no filler, but it is terse to the point of being under-specified. For an 11-parameter tool, a one-sentence description is not appropriately sized and lacks any structure such as parameter guidance or examples.

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 description provides a useful fallback-routing rule and the output schema may cover return values, but it is far from complete for a tool with 11 parameters and no parameter documentation. An agent cannot correctly invoke the tool without knowing valid actions and parameter combinations. Some usage context exists, but the operational picture is largely missing.

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 0% and the description names none of the 11 parameters. An agent receives no help understanding the required 'action' values or the roles of 'menu_path', 'modifiers', 'bundle_id', 'application', and the other parameters. With zero schema documentation, the description needed to compensate and it does not.

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 conveys that this is a fallback GUI control mechanism for Apple apps, but 'unified Apple control plane' and 'bounded GUI fallback actions' are abstract and do not say concretely what the tool performs, such as clicking menu paths, pressing keys, or typing text. It distinguishes from native app-domain tools, but not from the many system_gui_* siblings, so an agent would still need to open the schema to understand its role.

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 explicitly states the trigger condition: use when a native app-domain tool cannot complete the task. This gives a clear selection rule and implies this tool should not be the first-line approach. It does not name specific sibling alternatives, but the native-vs-fallback distinction is sufficient for routing.

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