disconnect_ssh · Arthas MCP Proxy MCP: Risk & Policy

WHAT IT DOES

What disconnect_ssh does on Arthas MCP Proxy

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

WHY IT NEEDS A POLICY

Why disconnect_ssh needs a policy

Disconnecting an SSH session is a state-modifying operation that closes a connection and releases resources. It is reversible (a new session can be reconnected) and does not irreversibly delete data, execute arbitrary code, or cause financial impact. This qualifies as Write category rather than Read (which would be passive queries) or Destructive (which would be irreversible data loss).

From the tool's definition Tool description states 'Disconnect an SSH session and release resources' - this modifies the state of an active SSH connection by terminating it and freeing associated resources, a reversible action typical of Write category.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

disconnect_ssh Rate-limited

disconnect_ssh 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": {
    "disconnect_ssh": {
      "limits": [
        {
          "counter": "disconnect_ssh_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 Arthas MCP Proxy, so you can run agents against it safely.

FAQ

Questions about disconnect_ssh

What does the disconnect_ssh tool do? +

Disconnect an SSH session and release resources. It is categorised as a Write tool in the Arthas MCP Proxy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on disconnect_ssh? +

Register the Arthas MCP Proxy MCP server in PolicyLayer and add a rule for disconnect_ssh: 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 Arthas MCP Proxy. Nothing to install.

What risk level is disconnect_ssh? +

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

Can I rate-limit disconnect_ssh? +

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

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

disconnect_ssh is provided by the Arthas MCP Proxy MCP server (narcissux/arthas-mcp-proxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.