AI agents use gateway_resource_policy_put 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 modifies resource policies governing access to SNS/SQS gateways, which affects authorization and security posture. While not destructive (policies can be reverted), and not immediately financial, the ability to modify gateway resource policies could grant unauthorized access to messaging services.
From the tool's definition Tool name 'gateway_resource_policy_put' indicates a PUT operation on resource policies, which modifies access control configurations. The 'put' verb indicates a write/create-or-replace operation.
Documented attack patterns abuse exactly the kind of access gateway_resource_policy_put 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 gateway_resource_policy_put:
{
"version": "1",
"default": "deny",
"tools": {
"gateway_resource_policy_put": {
"limits": [
{
"counter": "gateway_resource_policy_put_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gateway_resource_policy_put 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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gateway_resource_policy_put. 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 gateway_resource_policy_put: 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.
gateway_resource_policy_put 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 gateway_resource_policy_put 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 gateway_resource_policy_put. 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.
gateway_resource_policy_put 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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