serial_disconnect · MCP Remote Access MCP: Risk & Policy

WHAT IT DOES

What serial_disconnect does on MCP Remote Access

AI agents use serial_disconnect to create or update resources in MCP Remote Access — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Remote Access environment.

WHY IT NEEDS A POLICY

Why serial_disconnect needs a policy

An AI agent can call serial_disconnect faster than any human can review — one bad instruction and it creates or modifies resources in MCP Remote Access by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

serial_disconnect Rate-limited

serial_disconnect stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "serial_disconnect": {
      "limits": [
        {
          "counter": "serial_disconnect_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Remote Access, so you can run agents against it safely.

FAQ

Questions about serial_disconnect

What does the serial_disconnect tool do? +

Close a serial port connection. It is categorised as a Write tool in the MCP Remote Access MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on serial_disconnect? +

Register the MCP Remote Access MCP server in PolicyLayer and add a rule for serial_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 MCP Remote Access. Nothing to install.

What risk level is serial_disconnect? +

serial_disconnect is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit serial_disconnect? +

Yes. Add a rate_limit block to the serial_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 serial_disconnect completely? +

Set action: deny in the PolicyLayer policy for serial_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 serial_disconnect? +

serial_disconnect is provided by the MCP Remote Access MCP server (rfingadam/mcp-remote-access). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.