Restart a UniFi device.
AI agents invoke restart_device to trigger actions in UniFi MCP. 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.
Restarting a device is an Execute-class action that disrupts network services, potentially affecting multiple clients and operations. While not destructive (data is not deleted) or financial, it has significant blast radius if misused—an agent could restart critical infrastructure devices.
From the tool's definition The tool 'restart_device' triggers an external operation (device restart) whose effects depend on the device argument.
Documented attack patterns abuse exactly the kind of access restart_device gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and UniFi MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for restart_device:
{
"version": "1",
"default": "deny",
"tools": {
"restart_device": {
"limits": [
{
"counter": "restart_device_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}restart_device 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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Restart a UniFi device. It is categorised as a Execute tool in the UniFi MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the UniFi MCP server in PolicyLayer and add a rule for restart_device: 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 UniFi MCP. Nothing to install.
restart_device 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 restart_device 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 restart_device. 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.
restart_device is provided by the UniFi MCP server (jmagar/unifi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from UniFi MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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29 UniFi MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.