Moves the mouse to the coordinates (x, y) in the VNC session's workspace.
AI agents invoke move_mouse_to to trigger actions in Vnc. 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 triggers an external operation (mouse movement) on a remote desktop via VNC. It is an action with real effects on the remote system's UI state, placing it in Execute. Misuse could position the cursor for subsequent clicks on sensitive UI elements, but on its own the blast radius is moderate.
From the tool's definition Moves the mouse to the coordinates (x, y) in the VNC session's workspace
Documented attack patterns abuse exactly the kind of access move_mouse_to gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vnc, and nothing reaches the server without passing your rules. This is the rule we recommend for move_mouse_to:
{
"version": "1",
"default": "deny",
"tools": {
"move_mouse_to": {
"limits": [
{
"counter": "move_mouse_to_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}move_mouse_to 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.
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Moves the mouse to the coordinates (x, y) in the VNC session's workspace. It is categorised as a Execute tool in the Vnc MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Vnc MCP server in PolicyLayer and add a rule for move_mouse_to: 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. Nothing to install.
move_mouse_to 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 move_mouse_to 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 move_mouse_to. 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.
move_mouse_to is provided by the Vnc MCP server (regulad/vnc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vnc, 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.
20 Vnc tools catalogued and risk-classified — across an index of 43,000+ MCP servers.