tmux_create_session · TmuxControlLib MCP Server MCP

WHAT IT DOES

What tmux_create_session does on TmuxControlLib MCP Server

AI agents invoke tmux_create_session to trigger actions in TmuxControlLib MCP Server. 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 tmux_create_session needs a policy

Creating a tmux session spawns a new terminal session environment, which is an external system operation. While the description is empty (lowering confidence), the tool's name and server context strongly suggest it creates a new tmux session — an operation that establishes a shell environment in which arbitrary commands could subsequently be run.

From the tool's definition Tool name 'tmux_create_session' on a server described as enabling control of tmux sessions, managing windows and panes, and searching/extracting text from terminal output.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tmux_create_session Rate-limited

tmux_create_session 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": {
    "tmux_create_session": {
      "limits": [
        {
          "counter": "tmux_create_session_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 TmuxControlLib MCP Server, so you can run agents against it safely.

FAQ

Questions about tmux_create_session

What does the tmux_create_session tool do? +

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

How do I enforce a policy on tmux_create_session? +

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

What risk level is tmux_create_session? +

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

Can I rate-limit tmux_create_session? +

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

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

tmux_create_session is provided by the TmuxControlLib MCP Server MCP server (jbwinters/tmuxcontrollib). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.