update-security-group-rule-descriptions-egress

THE RISK

Medium Risk

Why update-security-group-rule-descriptions-egress needs a policy

This tool modifies security group egress rule metadata (descriptions) in AWS. While descriptions themselves are low-impact metadata, security group rules control network traffic flow and are critical infrastructure components.

From the tool's definition The tool is named 'update-security-group-rule-descriptions-egress' and described as 'Update the description of a security group rule egress in the given region'.

Documented attack patterns abuse exactly the kind of access update-security-group-rule-descriptions-egress gives an agent:

POLICY

How to control update-security-group-rule-descriptions-egress

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 update-security-group-rule-descriptions-egress:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update-security-group-rule-descriptions-egress": {
      "limits": [
        {
          "counter": "update-security-group-rule-descriptions-egress_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

update-security-group-rule-descriptions-egress 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.

Create a free account and register AWS MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update-security-group-rule-descriptions-egress

What does the update-security-group-rule-descriptions-egress tool do? +

Update the description of a security group rule egress 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.

How do I enforce a policy on update-security-group-rule-descriptions-egress? +

Register the AWS MCP Server MCP server in PolicyLayer and add a rule for update-security-group-rule-descriptions-egress: 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.

What risk level is update-security-group-rule-descriptions-egress? +

update-security-group-rule-descriptions-egress is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update-security-group-rule-descriptions-egress? +

Yes. Add a rate_limit block to the update-security-group-rule-descriptions-egress 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.

How do I block update-security-group-rule-descriptions-egress completely? +

Set action: deny in the PolicyLayer policy for update-security-group-rule-descriptions-egress. 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.

What MCP server provides update-security-group-rule-descriptions-egress? +

update-security-group-rule-descriptions-egress 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.

Enforce policy on every AWS MCP Server tool call.

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.

CHECK YOUR STACK →