cmux_rename_workspace · Cmux MCP: Risk & Policy

WHAT IT DOES

What cmux_rename_workspace does on Cmux

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

WHY IT NEEDS A POLICY

Why cmux_rename_workspace needs a policy

This tool modifies workspace configuration (title/name) reversibly. It does not execute arbitrary code, delete data, or trigger financial transactions. While it alters state, the change is non-destructive and can be undone by renaming again.

From the tool's definition Tool description states 'Set a workspace title' — a direct modification operation. The tool name contains 'rename' and operates on workspace metadata.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cmux_rename_workspace Rate-limited

cmux_rename_workspace 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": {
    "cmux_rename_workspace": {
      "limits": [
        {
          "counter": "cmux_rename_workspace_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 Cmux, so you can run agents against it safely.

FAQ

Questions about cmux_rename_workspace

What does the cmux_rename_workspace tool do? +

Set a workspace title. Uses workspace-action (the legacy rename alias mangles args). It is categorised as a Write tool in the Cmux MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on cmux_rename_workspace? +

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

What risk level is cmux_rename_workspace? +

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

Can I rate-limit cmux_rename_workspace? +

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

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

cmux_rename_workspace is provided by the Cmux MCP server (puchkoff/cmux-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.