reconnect_mqtt · CO2 Sensor MCP Server MCP: Risk & Policy

WHAT IT DOES

What reconnect_mqtt does on CO2 Sensor MCP Server

AI agents invoke reconnect_mqtt to trigger actions in CO2 Sensor 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 reconnect_mqtt needs a policy

The tool triggers an external operation — forcing a network reconnection to an MQTT broker. This is an Execute-category action as it initiates a real-world side effect (network/connection state change) rather than simply reading data or writing a record. Severity is medium because disrupting MQTT connectivity could interrupt sensor data flows.

From the tool's definition Force the device to reconnect to the MQTT broker

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reconnect_mqtt Rate-limited

reconnect_mqtt 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": {
    "reconnect_mqtt": {
      "limits": [
        {
          "counter": "reconnect_mqtt_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 CO2 Sensor MCP Server, so you can run agents against it safely.

FAQ

Questions about reconnect_mqtt

What does the reconnect_mqtt tool do? +

Force the device to reconnect to the MQTT broker (NOT IMPLEMENTED). It is categorised as a Execute tool in the CO2 Sensor 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 reconnect_mqtt? +

Register the CO2 Sensor MCP Server MCP server in PolicyLayer and add a rule for reconnect_mqtt: 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 CO2 Sensor MCP Server. Nothing to install.

What risk level is reconnect_mqtt? +

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

Can I rate-limit reconnect_mqtt? +

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

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

reconnect_mqtt is provided by the CO2 Sensor MCP Server MCP server (kmwebnet/mcp-server-for-sensor-device). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.