AI agents use gateway_update 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.
The tool name indicates an update/modification operation on a gateway resource, which is reversible (Write category) rather than destructive. However, without a description, confidence is moderate. In the context of SNS/SQS, gateway updates could affect message routing or access controls, making the severity high due to potential blast radius affecting message delivery infrastructure.
From the tool's definition Tool name 'gateway_update' suggests modification of gateway configuration; server context is Amazon SNS/SQS messaging services where gateway updates would alter routing, permissions, or message delivery paths.
Documented attack patterns abuse exactly the kind of access gateway_update 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_update:
{
"version": "1",
"default": "deny",
"tools": {
"gateway_update": {
"limits": [
{
"counter": "gateway_update_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gateway_update 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_update. 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_update: 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_update 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_update 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_update. 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_update 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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