kubectl_patch · Kubernetes MCP Server MCP: Risk & Policy

WHAT IT DOES

What kubectl_patch does on Kubernetes MCP Server

AI agents use kubectl_patch 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_patch needs a policy

kubectl patch modifies existing Kubernetes resource fields without deletion. While reversible (patches can be undone), it has high severity because misconfigured patches could disrupt running workloads, alter security policies, or modify critical resource configurations. However, it does not irreversibly delete data (would be Destructive) nor execute arbitrary code (would be Execute).

From the tool's definition Tool name 'kubectl_patch' combined with description '更新Kubernetes资源的字段' (update Kubernetes resource fields) indicates in-place modification of cluster resources. This is a reversible write operation on Kubernetes objects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

kubectl_patch Rate-limited

kubectl_patch 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_patch": {
      "limits": [
        {
          "counter": "kubectl_patch_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_patch

What does the kubectl_patch tool do? +

更新Kubernetes资源的字段. 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_patch? +

Register the Kubernetes MCP Server MCP server in PolicyLayer and add a rule for kubectl_patch: 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_patch? +

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

Can I rate-limit kubectl_patch? +

Yes. Add a rate_limit block to the kubectl_patch 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_patch completely? +

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

kubectl_patch 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.