close_connection · SSH MCP Server MCP: Risk & Policy

WHAT IT DOES

What close_connection does on SSH MCP Server

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

WHY IT NEEDS A POLICY

Why close_connection needs a policy

This tool modifies state (closes a session, removes from global state) but does not execute commands, delete permanent data, or cause irreversible damage. It's a reversible state change—a new connection can be created again. This is analogous to logging out or disconnecting, which falls under Write (state modification) rather than Execute or Destructive.

From the tool's definition Tool terminates an SSH session and removes it from global state. The description explicitly indicates modification of connection state through disconnection.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

close_connection Rate-limited

close_connection 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": {
    "close_connection": {
      "limits": [
        {
          "counter": "close_connection_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 SSH MCP Server, so you can run agents against it safely.

FAQ

Questions about close_connection

What does the close_connection tool do? +

Terminate an SSH session and remove it from global state. It is categorised as a Write tool in the SSH MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on close_connection? +

Register the SSH MCP Server MCP server in PolicyLayer and add a rule for close_connection: 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 SSH MCP Server. Nothing to install.

What risk level is close_connection? +

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

Can I rate-limit close_connection? +

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

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

close_connection is provided by the SSH MCP Server MCP server (vilasone455/ssh-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.