AI agents use attach-internet-gateway to create or update resources in AWS MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS MCP Server environment.
Attaching an internet gateway to a VPC modifies network infrastructure by enabling internet connectivity for resources within the VPC. This is a reversible write operation (the gateway can be detached), but misuse can expose private cloud resources to the public internet, resulting in high severity blast radius.
From the tool's definition Attach an internet gateway to a VPC
Documented attack patterns abuse exactly the kind of access attach-internet-gateway gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for attach-internet-gateway:
{
"version": "1",
"default": "deny",
"tools": {
"attach-internet-gateway": {
"limits": [
{
"counter": "attach-internet-gateway_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}attach-internet-gateway 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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Attach an internet gateway to a VPC. It is categorised as a Write tool in the AWS MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the AWS MCP Server MCP server in PolicyLayer and add a rule for attach-internet-gateway: 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 MCP Server. Nothing to install.
attach-internet-gateway 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 attach-internet-gateway 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 attach-internet-gateway. 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.
attach-internet-gateway is provided by the AWS MCP Server MCP server (lokeswaran-aj/aws-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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54 AWS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.