stream_group_create

THE RISK

Medium Risk

Why stream_group_create needs a policy

Creating a consumer group is a reversible write operation that establishes a new resource for stream processing. It does not destroy data, execute arbitrary code, or move money. However, it could have medium severity due to potential downstream effects on stream consumption patterns and resource costs if misused by an agent (e.g., creating many groups).

From the tool's definition Tool name 'stream_group_create' and description 'Create consumer group' indicate creation of a new resource (AWS Kinesis or similar stream consumer group). This is a write operation that modifies state by adding a new entity.

Documented attack patterns abuse exactly the kind of access stream_group_create gives an agent:

POLICY

How to control stream_group_create

PolicyLayer is an MCP gateway — it sits between your AI agents and Amazon ECS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for stream_group_create:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stream_group_create": {
      "limits": [
        {
          "counter": "stream_group_create_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

stream_group_create 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 Amazon ECS 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 805 Amazon ECS MCP Server tools →

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about stream_group_create

What does the stream_group_create tool do? +

Create consumer group. It is categorised as a Write tool in the Amazon ECS 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 stream_group_create? +

Register the Amazon ECS MCP Server MCP server in PolicyLayer and add a rule for stream_group_create: 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 Amazon ECS MCP Server. Nothing to install.

What risk level is stream_group_create? +

stream_group_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit stream_group_create? +

Yes. Add a rate_limit block to the stream_group_create 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 stream_group_create completely? +

Set action: deny in the PolicyLayer policy for stream_group_create. 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 stream_group_create? +

stream_group_create is provided by the Amazon ECS MCP Server MCP server (awslabs.ecs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Amazon ECS MCP Server tool call.

Start from Amazon ECS 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 →