Press a specified keyboard key or type a character in the active Firefox-family browser tab to trigger shortcuts, navigation, or form input.
Press a key on the keyboard
| Name | Required | Description | Default |
|---|---|---|---|
| key | Yes | Name of the key to press or a character to generate, such as `ArrowLeft` or `a` |
Changes observed during successful MCP inspections.
v0.4.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description does not mention any side effects, such as triggering keyboard events or potential destructive behavior. The annotations indicate destructiveHint: true, but the description adds no additional behavioral context beyond that.
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 extremely concise — a single sentence that directly conveys the action. No unnecessary information or repetition.
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 action with a single well-defined parameter, the description is adequate. It lacks mention of when to use this tool (e.g., for shortcuts or navigation keys) but is otherwise complete for basic 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?
The parameter 'key' is fully described in the schema with examples, and schema coverage is 100%. The description adds minimal extra meaning ('on the keyboard') but doesn't clarify key formats or special keys, which is already covered by 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 clearly states the action (press) and the resource (key on the keyboard). It is distinct from broader actions like navigate or click, though it does not explicitly differentiate from browser_type (typing) or browser_click (clicking).
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 provided on when to use this tool versus its siblings (e.g., browser_type for text entry or browser_click for mouse actions). The description lacks any contextual cues for choosing this tool.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.