keypress · ComputerMate MCP: Risk & Policy

WHAT IT DOES

What keypress does on ComputerMate

AI agents invoke keypress to trigger actions in ComputerMate. 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.

WHY IT NEEDS A POLICY

Why keypress needs a policy

Keypresses are external computer control operations. A malicious or mistaken agent could send dangerous key combinations (e.g., Ctrl+Alt+Del, Alt+F4, Win+R to run commands, Ctrl+C/V to exfiltrate data) with wide-ranging and potentially irreversible effects on the controlled system.

From the tool's definition 'Press a key combination. For combos like Ctrl+C' — triggers keyboard input actions on a real or sandboxed computer, executing arbitrary key combinations that can trigger system-level commands, copy/paste, close applications, etc.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

keypress Rate-limited

keypress 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "keypress": {
      "limits": [
        {
          "counter": "keypress_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches ComputerMate, so you can run agents against it safely.

FAQ

Questions about keypress

What does the keypress tool do? +

Press a key combination. For combos like Ctrl+C, pass [. It is categorised as a Execute tool in the ComputerMate MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on keypress? +

Register the ComputerMate MCP server in PolicyLayer and add a rule for keypress: 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 ComputerMate. Nothing to install.

What risk level is keypress? +

keypress is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit keypress? +

Yes. Add a rate_limit block to the keypress 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.

How do I block keypress completely? +

Set action: deny in the PolicyLayer policy for keypress. 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.

What MCP server provides keypress? +

keypress is provided by the ComputerMate MCP server (one710/computermate). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.