cluster_update · GreenNode MCP Server MCP: Risk & Policy

WHAT IT DOES

What cluster_update does on GreenNode MCP Server

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

WHY IT NEEDS A POLICY

Why cluster_update needs a policy

The name 'cluster_update' strongly implies modifying an existing Kubernetes cluster configuration. Updates to clusters are generally reversible (Write category), but given the blast radius of misconfiguring a production cluster, severity is high. Confidence is reduced due to empty description — it could potentially trigger destructive operations, but 'update' conventionally implies modification rather than deletion.

From the tool's definition Tool name 'cluster_update' on a server that manages VNG Cloud infrastructure including Kubernetes resources. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cluster_update Rate-limited

cluster_update 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": {
    "cluster_update": {
      "limits": [
        {
          "counter": "cluster_update_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 GreenNode MCP Server, so you can run agents against it safely.

FAQ

Questions about cluster_update

What does the cluster_update tool do? +

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

How do I enforce a policy on cluster_update? +

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

What risk level is cluster_update? +

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

Can I rate-limit cluster_update? +

Yes. Add a rate_limit block to the cluster_update 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_update completely? +

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

cluster_update is provided by the GreenNode MCP Server MCP server (vngcloud/greennode-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.