create_kubeconfig · Rancher MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_kubeconfig does on Rancher MCP Server

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

WHY IT NEEDS A POLICY

Why create_kubeconfig needs a policy

This tool creates a new kubeconfig credential document, which is a reversible write operation. While it doesn't directly modify cluster state, it produces authentication credentials that could be used to access Kubernetes clusters. The severity is high because kubeconfig documents contain sensitive credential material that, if generated for the wrong context or intercepted, could grant unauthorized cluster access.

From the tool's definition Tool generates and creates a kubeconfig document (credential artifact). The verb 'generate' + 'kubeconfig' indicates creation of a new credential/configuration file that can be used for authentication.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_kubeconfig Rate-limited

create_kubeconfig 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": {
    "create_kubeconfig": {
      "limits": [
        {
          "counter": "create_kubeconfig_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 Rancher MCP Server, so you can run agents against it safely.

FAQ

Questions about create_kubeconfig

What does the create_kubeconfig tool do? +

Generate a kubeconfig document for the given cluster. It is categorised as a Write tool in the Rancher 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 create_kubeconfig? +

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

What risk level is create_kubeconfig? +

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

Can I rate-limit create_kubeconfig? +

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

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

create_kubeconfig is provided by the Rancher MCP Server MCP server (lokimcpuniverse/rancher-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.