gateway_update · Awslabs Valkey MCP: Risk & Policy

WHAT IT DOES

What gateway_update does on Awslabs Valkey

AI agents use gateway_update to create or update resources in Awslabs Valkey — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Awslabs Valkey environment.

WHY IT NEEDS A POLICY

Why gateway_update needs a policy

Despite the empty description, the tool name 'gateway_update' unambiguously signals a write/modification action rather than a read, delete, or execute operation. In AWS ElastiCache/MemoryDB contexts, gateway updates could affect cluster connectivity, routing, or access control, making them Write-category with high severity due to potential blast radius on data availability if misconfigured.

From the tool's definition Tool name 'gateway_update' indicates a modification operation on AWS ElastiCache/MemoryDB infrastructure. In the context of a Valkey/Redis MCP server, 'update' operations on gateways typically modify configuration or state of data access endpoints.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gateway_update Rate-limited

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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Awslabs Valkey, so you can run agents against it safely.

FAQ

Questions about gateway_update

What does the gateway_update tool do? +

gateway_update. It is categorised as a Write tool in the Awslabs Valkey MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gateway_update? +

Register the Awslabs Valkey 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 Valkey. Nothing to install.

What risk level is gateway_update? +

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

Can I rate-limit gateway_update? +

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.

How do I block gateway_update completely? +

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.

What MCP server provides gateway_update? +

gateway_update is provided by the Awslabs Valkey MCP server (awslabs.valkey-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.