kubectl_apply · Kubernetes MCP Server MCP: Risk & Policy

WHAT IT DOES

What kubectl_apply does on Kubernetes MCP Server

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

WHY IT NEEDS A POLICY

Why kubectl_apply needs a policy

kubectl apply creates or modifies Kubernetes resources (deployments, services, configs, etc.) based on the provided YAML manifest. This is a Write operation as it can create new resources or update existing ones, but changes are generally reversible (resources can be deleted or reverted).

From the tool's definition "应用Kubernetes YAML清单" (Apply Kubernetes YAML manifest) — 'apply' creates or updates Kubernetes resources from a manifest

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

kubectl_apply Rate-limited

kubectl_apply 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": {
    "kubectl_apply": {
      "limits": [
        {
          "counter": "kubectl_apply_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 Kubernetes MCP Server, so you can run agents against it safely.

FAQ

Questions about kubectl_apply

What does the kubectl_apply tool do? +

应用Kubernetes YAML清单. It is categorised as a Write tool in the Kubernetes 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 kubectl_apply? +

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

What risk level is kubectl_apply? +

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

Can I rate-limit kubectl_apply? +

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

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

kubectl_apply is provided by the Kubernetes MCP Server MCP server (secret-deus/kubernetes-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.