Modify a security group rule in the given region
AI agents use modify-security-group-rules 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.
Modifying security group rules changes network access policies but is not destructive—rules can be modified again or reverted. This is a Write operation rather than Execute because it changes configuration state rather than triggering immediate code/command execution.
From the tool's definition Tool modifies security group rules, which is a reversible configuration change. The description states 'Modify a security group rule' and security groups are AWS network access control lists that can be updated and reverted.
Documented attack patterns abuse exactly the kind of access modify-security-group-rules 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 modify-security-group-rules:
{
"version": "1",
"default": "deny",
"tools": {
"modify-security-group-rules": {
"limits": [
{
"counter": "modify-security-group-rules_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}modify-security-group-rules 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.
Free to start. No card required.
Modify a security group rule in the given region. 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 modify-security-group-rules: 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.
modify-security-group-rules 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 modify-security-group-rules 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 modify-security-group-rules. 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.
modify-security-group-rules 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.
Free to start. No card required.
54 AWS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.