System Gui Press Keys

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

The description discloses no behavioral traits. While annotations exist, they do not clarify the runtime effect of pressing keys, whether the action targets the frontmost application or a specified bundle_id, or whether any side effects such as focus changes or app navigation may occur. The description adds zero behavioral context beyond the 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?

The description is short, but it is under-specified rather than concise. It spends its only sentence on generic MCP routing boilerplate instead of tool-specific information. Every sentence should earn its place, and this one does not.

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?

Even with an output schema present, this is a GUI automation tool that manipulates keyboard input. The agent needs to know what the key parameter accepts, how modifiers are formatted, what bundle_id and application do, and what the function returns. None of that is present, making the description inadequate for correct invocation.

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%, so the description carries full responsibility for explaining parameters, but it explains none of them. The four parameters (key, bundle_id, modifiers, application) remain entirely undocumented in terms of their meaning, allowed values, or interactions.

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 is essentially a boilerplate wrapper: 'Delegated Apple domain tool ... exposed through Apple-Tools-MCP.' It restates the tool name without explaining what pressing keys does, what resource it acts on, or how it differs from sibling tools like system_gui_type_text. This provides almost no functional meaning to an agent selecting the tool.

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 versus alternatives. There is no mention of which applications or contexts support key pressing, no note about frontmost app targeting, and no comparison to sibling GUI tools such as system_gui_type_text or system_gui_click_button.

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