attach_group_policy

THE RISK

Medium Risk

Why attach_group_policy needs a policy

Attaching a policy to a group is a reversible write operation that modifies IAM permissions. While not immediately destructive, it has high blast radius if an AI agent attaches overly permissive policies (e.g., admin policies to unintended groups), potentially granting unintended access. This is less severe than Financial or Destructive actions but more impactful than simple data retrieval.

From the tool's definition Tool name 'attach_group_policy' indicates it modifies IAM group policy attachments. The sibling tool 'add_inline_policy' confirms this server handles policy modifications.

Documented attack patterns abuse exactly the kind of access attach_group_policy gives an agent:

POLICY

How to control attach_group_policy

PolicyLayer is an MCP gateway — it sits between your AI agents and Amazon EKS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for attach_group_policy:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "attach_group_policy": {
      "limits": [
        {
          "counter": "attach_group_policy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

attach_group_policy 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.

Create a free account and register Amazon EKS MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 805 Amazon EKS MCP Server tools →

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about attach_group_policy

What does the attach_group_policy tool do? +

attach_group_policy. It is categorised as a Write tool in the Amazon EKS 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 attach_group_policy? +

Register the Amazon EKS MCP Server MCP server in PolicyLayer and add a rule for attach_group_policy: 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 Amazon EKS MCP Server. Nothing to install.

What risk level is attach_group_policy? +

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

Can I rate-limit attach_group_policy? +

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

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

attach_group_policy is provided by the Amazon EKS MCP Server MCP server (awslabs.eks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Amazon EKS MCP Server tool call.

Start from Amazon EKS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →