mqtt_disconnect

THE RISK

Low Risk

Why mqtt_disconnect needs a policy

This tool terminates a network/messaging connection to the printer. It does not read data, write/modify data, execute code, delete anything, or move money. It simply closes a communication channel. The closest category is 'Other' as it is a connectivity management action. Misuse could disrupt printer monitoring/control but causes no direct data or financial harm.

From the tool's definition Disconnect from the MQTT printer connection

Documented attack patterns abuse exactly the kind of access mqtt_disconnect gives an agent:

POLICY

How to control mqtt_disconnect

PolicyLayer is an MCP gateway — it sits between your AI agents and Bambu Lab MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for mqtt_disconnect:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mqtt_disconnect": {
      "limits": [
        {
          "counter": "mqtt_disconnect_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

mqtt_disconnect gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Bambu Lab MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mqtt_disconnect

What does the mqtt_disconnect tool do? +

Disconnect from the MQTT printer connection. It is categorised as a Other tool in the Bambu Lab MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on mqtt_disconnect? +

Register the Bambu Lab MCP Server MCP server in PolicyLayer and add a rule for mqtt_disconnect: 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 Bambu Lab MCP Server. Nothing to install.

What risk level is mqtt_disconnect? +

mqtt_disconnect is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit mqtt_disconnect? +

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

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

mqtt_disconnect is provided by the Bambu Lab MCP Server MCP server (schwarztim/bambu-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bambu Lab MCP Server tool call.

Start from Bambu Lab MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →