remote_bash_execute · Tmux MCP: Risk & Policy

WHAT IT DOES

What remote_bash_execute does on Tmux

AI agents invoke remote_bash_execute to trigger actions in Tmux. 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 remote_bash_execute needs a policy

This tool executes shell commands on remote systems via tmux, which is Execute category (runs code/commands with effects dependent on arguments). Severity is critical due to unrestricted command execution potential on remote machines—an AI agent misuse could compromise systems, exfiltrate data, or cause widespread damage.

From the tool's definition Tool name 'remote_bash_execute' combined with server description stating it 'manage[s] and interact[s] with tmux sessions' indicates execution of arbitrary bash commands on remote systems.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

remote_bash_execute Rate-limited

remote_bash_execute 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": {
    "remote_bash_execute": {
      "limits": [
        {
          "counter": "remote_bash_execute_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 Tmux, so you can run agents against it safely.

FAQ

Questions about remote_bash_execute

What does the remote_bash_execute tool do? +

remote_bash_execute. It is categorised as a Execute tool in the Tmux MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on remote_bash_execute? +

Register the Tmux MCP server in PolicyLayer and add a rule for remote_bash_execute: 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 Tmux. Nothing to install.

What risk level is remote_bash_execute? +

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

Can I rate-limit remote_bash_execute? +

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

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

remote_bash_execute is provided by the Tmux MCP server (wenlixiao-cs/tmux-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.