Simulate keyboard typing to input text into the currently focused application or text field. Supports all standard characters, numbers, symbols, and Unicode text. Use adjustable delay between keystrokes (default 50ms) to ensure reliable input in different applications. Essential for form filling,...
AI agents invoke type_text to trigger actions in macOS Simulator MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool directly controls keyboard input into running applications, which can trigger commands, submit forms, execute code, or manipulate any focused application. The effects are highly context-dependent and can range from benign text entry to executing shell commands or modifying critical data, making it an Execute-category tool with high blast radius potential.
From the tool's definition Simulate keyboard typing to input text into the currently focused application or text field... Essential for form filling, search queries, code input, and any text entry tasks.
Documented attack patterns abuse exactly the kind of access type_text gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and macOS Simulator MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for type_text:
{
"version": "1",
"default": "deny",
"tools": {
"type_text": {
"limits": [
{
"counter": "type_text_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}type_text stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Simulate keyboard typing to input text into the currently focused application or text field. Supports all standard characters, numbers, symbols, and Unicode text. Use adjustable delay between keystrokes (default 50ms) to ensure reliable input in different applications. Essential for form filling, search queries, code input, and any text entry tasks. Make sure to click on target input field first or use focus_window to ensure text goes to intended destination. For special keys or key combinations, use key_press instead. Supports newlines and special characters. Requires accessibility permission on macOS. It is categorised as a Execute tool in the macOS Simulator MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the macOS Simulator MCP Server MCP server in PolicyLayer and add a rule for type_text: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches macOS Simulator MCP Server. Nothing to install.
type_text is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the type_text rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for type_text. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
type_text is provided by the macOS Simulator MCP Server MCP server (ohqay/mac-commander). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from macOS Simulator MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
28 macOS Simulator MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.