ssh_disconnect · Claude Ssh MCP: Risk & Policy

WHAT IT DOES

What ssh_disconnect does on Claude Ssh

AI agents invoke ssh_disconnect to trigger actions in Claude Ssh. 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 ssh_disconnect needs a policy

Disconnecting an SSH session terminates an active network connection and any running processes tied to that session. While not destructive to data, it is an operational action with real side effects (terminating remote processes, interrupting ongoing work) that cannot be trivially undone. It falls under Execute as it triggers an external operation affecting the SSH connection state.

From the tool's definition Close an active SSH session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ssh_disconnect Rate-limited

ssh_disconnect 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": {
    "ssh_disconnect": {
      "limits": [
        {
          "counter": "ssh_disconnect_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 Claude Ssh, so you can run agents against it safely.

FAQ

Questions about ssh_disconnect

What does the ssh_disconnect tool do? +

Close an active SSH session. It is categorised as a Execute tool in the Claude Ssh MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ssh_disconnect? +

Register the Claude Ssh MCP server in PolicyLayer and add a rule for ssh_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 Claude Ssh. Nothing to install.

What risk level is ssh_disconnect? +

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

Can I rate-limit ssh_disconnect? +

Yes. Add a rate_limit block to the ssh_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 ssh_disconnect completely? +

Set action: deny in the PolicyLayer policy for ssh_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 ssh_disconnect? +

ssh_disconnect is provided by the Claude Ssh MCP server (marabank/mcp-ssh-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.