vnc_execute_sequence · VNC MCP Server MCP: Risk & Policy

WHAT IT DOES

What vnc_execute_sequence does on VNC MCP Server

AI agents invoke vnc_execute_sequence to trigger actions in VNC 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.

WHY IT NEEDS A POLICY

Why vnc_execute_sequence needs a policy

This tool allows an AI agent to programmatically control a remote computer by simulating user input (mouse moves, clicks, keyboard input, waits). An agent could use this to interact with any GUI application, browser, or system interface without restrictions. The 'sequence' capability amplifies risk by enabling complex multi-step operations in one call.

From the tool's definition "Execute a sequence of input actions (move, click, type, key, wait)" — the tool directly controls computer input/output by clicking, typing, and triggering keyboard events.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vnc_execute_sequence Rate-limited

vnc_execute_sequence 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": {
    "vnc_execute_sequence": {
      "limits": [
        {
          "counter": "vnc_execute_sequence_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 VNC MCP Server, so you can run agents against it safely.

FAQ

Questions about vnc_execute_sequence

What does the vnc_execute_sequence tool do? +

Execute a sequence of input actions (move, click, type, key, wait) in a single call for higher speed. It is categorised as a Execute tool in the VNC MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on vnc_execute_sequence? +

Register the VNC MCP Server MCP server in PolicyLayer and add a rule for vnc_execute_sequence: 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 VNC MCP Server. Nothing to install.

What risk level is vnc_execute_sequence? +

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

Can I rate-limit vnc_execute_sequence? +

Yes. Add a rate_limit block to the vnc_execute_sequence 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 vnc_execute_sequence completely? +

Set action: deny in the PolicyLayer policy for vnc_execute_sequence. 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 vnc_execute_sequence? +

vnc_execute_sequence is provided by the VNC MCP Server MCP server (volkan-m/vnc-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.