toolmux_batch · Mcp Toolmux MCP: Risk & Policy

WHAT IT DOES

What toolmux_batch does on Mcp Toolmux

AI agents invoke toolmux_batch to trigger actions in Mcp Toolmux. 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 toolmux_batch needs a policy

This tool executes downstream MCP tools in batch, meaning it can trigger any operation (read, write, destructive, financial) depending on which tool is called and with what arguments.

From the tool's definition 'Call one downstream MCP tool with multiple argument sets' — executes downstream MCP tools, potentially triggering arbitrary operations across multiple invocations

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

toolmux_batch Rate-limited

toolmux_batch 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": {
    "toolmux_batch": {
      "limits": [
        {
          "counter": "toolmux_batch_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 Mcp Toolmux, so you can run agents against it safely.

FAQ

Questions about toolmux_batch

What does the toolmux_batch tool do? +

Call one downstream MCP tool with multiple argument sets. It is categorised as a Execute tool in the Mcp Toolmux MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on toolmux_batch? +

Register the Mcp Toolmux MCP server in PolicyLayer and add a rule for toolmux_batch: 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 Mcp Toolmux. Nothing to install.

What risk level is toolmux_batch? +

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

Can I rate-limit toolmux_batch? +

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

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

toolmux_batch is provided by the Mcp Toolmux MCP server (mxz-dddd/mcp-toolmux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.