attach_group_policy

A write tool on the AWS MCP server.

SERVERAWS SOURCE@awslabs/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/aws/attach-group-policy.md

WHAT IT DOES

What attach_group_policy does on AWS

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

RISK

Why attach_group_policy is rated Medium

Attaching a policy to a group modifies access control by granting permissions to all group members. This is a reversible Write operation (policies can be detached), but has high severity due to potential privilege escalation and wide blast radius across all users in the group. Not Destructive because the action is reversible; not Execute because it doesn't run arbitrary code.

From the tool's definition Tool name 'attach_group_policy' indicates attaching (modifying/adding) an IAM policy to a group. Context from sibling tools shows this is an AWS IAM management server ('add_user_to_group', 'attach_user_policy').

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs attach_group_policy safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AWS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For attach_group_policy, this is the rule to start with:

attach_group_policy Rate-limited

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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every attach_group_policy call is checked against it from then on.

FAQ

Questions about attach_group_policy

What does the attach_group_policy tool do? +

attach_group_policy is a write tool on the AWS MCP server. It is categorised as a Write tool in the AWS 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 AWS 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 AWS. 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 AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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