add_user_to_group

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/add-user-to-group.md

WHAT IT DOES

What add_user_to_group does on AWS

AI agents use add_user_to_group 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 add_user_to_group is rated Medium

Adding a user to a group modifies IAM configurations reversibly and creates access relationships. This is a Write operation with high severity because incorrect group assignments could grant unintended permissions or affect security posture, though it is not Destructive (reversible) or Execute (no code execution).

From the tool's definition Tool name 'add_user_to_group' indicates modification of IAM group membership. Sibling tools include 'attach_group_policy' and 'attach_user_policy', confirming this is an AWS IAM identity/access management context where user group membership changes have Write…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_user_to_group 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 add_user_to_group, this is the rule to start with:

add_user_to_group Rate-limited

add_user_to_group 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": {
    "add_user_to_group": {
      "limits": [
        {
          "counter": "add_user_to_group_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 add_user_to_group call is checked against it from then on.

FAQ

Questions about add_user_to_group

What does the add_user_to_group tool do? +

add_user_to_group 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 add_user_to_group? +

Register the AWS MCP server in PolicyLayer and add a rule for add_user_to_group: 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 add_user_to_group? +

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

Can I rate-limit add_user_to_group? +

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

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

add_user_to_group 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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