Simulate pressing a combination of keys. Use any of the following special keys: ctrl, shift, alt, esc, enter, tab, space, left, right, up, down as well the regular characters. ONLY USE THIS AS A LAST RESORT.
AI agents invoke press_keys to trigger actions in MCP Windows. 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.
Simulating arbitrary keystrokes can trigger any action in any application — submitting forms, executing commands, deleting files, or interacting with system dialogs. The effects are entirely argument-dependent and can span all severity levels. The server's own warning ('ONLY USE THIS AS A LAST RESORT') confirms the high blast radius.
From the tool's definition Simulate pressing a combination of keys... ONLY USE THIS AS A LAST RESORT.
Documented attack patterns abuse exactly the kind of access press_keys gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Windows, and nothing reaches the server without passing your rules. This is the rule we recommend for press_keys:
{
"version": "1",
"default": "deny",
"tools": {
"press_keys": {
"limits": [
{
"counter": "press_keys_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}press_keys 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 pressing a combination of keys. Use any of the following special keys: ctrl, shift, alt, esc, enter, tab, space, left, right, up, down as well the regular characters. ONLY USE THIS AS A LAST RESORT. It is categorised as a Execute tool in the MCP Windows MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP Windows MCP server in PolicyLayer and add a rule for press_keys: 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 MCP Windows. Nothing to install.
press_keys 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 press_keys 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 press_keys. 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.
press_keys is provided by the MCP Windows MCP server (secretiveshell/mcp-windows). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Windows, 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 MCP Windows tools catalogued and risk-classified — across an index of 43,000+ MCP servers.