AI agents use add_user_to_group to create or update resources in Awslabs Amazon Sns Sqs — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Awslabs Amazon Sns Sqs environment.
This tool creates or modifies access control state by adding a user to a group. It is reversible (the user can be removed), so it does not qualify as Destructive. The empty description limits confidence, but the naming pattern and context strongly suggest a Write operation with medium severity due to potential privilege escalation or access control changes if misused by an agent.
From the tool's definition Tool name 'add_user_to_group' indicates a mutating operation that adds a user to a group, which modifies membership state. However, the tool description is empty, reducing confidence.
Documented attack patterns abuse exactly the kind of access add_user_to_group gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Amazon Sns Sqs, and nothing reaches the server without passing your rules. This is the rule we recommend for add_user_to_group:
{
"version": "1",
"default": "deny",
"tools": {
"add_user_to_group": {
"limits": [
{
"counter": "add_user_to_group_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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add_user_to_group. It is categorised as a Write tool in the Awslabs Amazon Sns Sqs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Awslabs Amazon Sns Sqs 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 Awslabs Amazon Sns Sqs. Nothing to install.
add_user_to_group is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
add_user_to_group is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Awslabs Amazon Sns Sqs, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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