cluster_bash · Cluster Execution MCP Server MCP

WHAT IT DOES

What cluster_bash does on Cluster Execution MCP Server

AI agents invoke cluster_bash to trigger actions in Cluster Execution 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 cluster_bash needs a policy

The tool name 'cluster_bash' combined with the server's explicit purpose of cluster-wide command execution and SSH-based remote node management strongly implies this tool executes bash/shell commands across multiple distributed nodes simultaneously.

From the tool's definition Tool name 'cluster_bash' on a server described as enabling 'cluster-aware command execution', 'parallel execution', 'remote node management via SSH', and 'dynamic load balancing'. The 'bash' suffix strongly implies shell command execution.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cluster_bash Rate-limited

cluster_bash 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": {
    "cluster_bash": {
      "limits": [
        {
          "counter": "cluster_bash_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 Cluster Execution MCP Server, so you can run agents against it safely.

FAQ

Questions about cluster_bash

What does the cluster_bash tool do? +

cluster_bash. It is categorised as a Execute tool in the Cluster Execution 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 cluster_bash? +

Register the Cluster Execution MCP Server MCP server in PolicyLayer and add a rule for cluster_bash: 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 Cluster Execution MCP Server. Nothing to install.

What risk level is cluster_bash? +

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

Can I rate-limit cluster_bash? +

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

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

cluster_bash is provided by the Cluster Execution MCP Server MCP server (marc-shade/cluster-execution-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.