press_key

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The description only states what it does (simulates a key press) but doesn't disclose side effects, focus requirements, whether this operates on a hardware keyboard vs virtual keyboard, or whether modifier keys are supported. As a mutation-style input tool with zero annotation coverage, more behavioral context is needed.

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?

Single sentence, no wasted words. The sentence is front-loaded with the clear purpose. Could arguably be more concise but it's already efficient and to the point.

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?

For a simple single-parameter tool, the description is mostly adequate. However, without any annotations or output schema, the description should clarify return behavior (does it succeed silently, return a result?) and the context in which key presses are meaningful (e.g., requires an active field or focused element). These gaps lower the completeness below what would be ideal for a tool with zero annotations.

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 coverage is 100%, and the schema lists all valid key names. The description adds the human-readable examples which reinforces the key values but adds no semantic beyond what the schema's key description already provides. With 100% coverage, baseline 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 states 'Simulates a keyboard key press' with a specific verb and resource, and lists concrete examples (enter, tab, escape, backspace, arrow keys). It's clear in purpose. It doesn't explicitly distinguish from siblings like enter_text or tap, but the keyboard-press focus is distinct enough given the examples.

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 when-to-use or when-not-to-use guidance is provided. It doesn't clarify when to use press_key versus enter_text (which likely handles text input) or tap (which handles UI tapping). An agent would have to infer the distinction from the examples rather than from explicit guidance.

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