tmux_rename_session · Tmux MCP: Risk & Policy

WHAT IT DOES

What tmux_rename_session does on Tmux

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

WHY IT NEEDS A POLICY

Why tmux_rename_session needs a policy

Renaming a tmux session modifies metadata (the session name) reversibly — the session itself and its contents are unaffected, and the name can be changed again at any time. This is a straightforward Write operation with minimal blast radius.

From the tool's definition Rename a tmux session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tmux_rename_session Rate-limited

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

FAQ

Questions about tmux_rename_session

What does the tmux_rename_session tool do? +

Rename a tmux session. It is categorised as a Write tool in the Tmux MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tmux_rename_session? +

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

What risk level is tmux_rename_session? +

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

Can I rate-limit tmux_rename_session? +

Yes. Add a rate_limit block to the tmux_rename_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_rename_session completely? +

Set action: deny in the PolicyLayer policy for tmux_rename_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_rename_session? +

tmux_rename_session 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.