modify-cache-cluster · Awslabs Valkey MCP: Risk & Policy

WHAT IT DOES

What modify-cache-cluster does on Awslabs Valkey

AI agents use modify-cache-cluster 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 modify-cache-cluster needs a policy

The tool name strongly suggests it modifies an existing ElastiCache/MemoryDB Valkey cache cluster. While the description is empty, 'modify' is a clear Write action that would alter cluster properties (configuration, parameters, etc.) in a reversible manner. This is not Destructive (no deletion), not Execute (not running code), and not Financial.

From the tool's definition Tool name 'modify-cache-cluster' indicates modification of cache cluster configuration or state. The name contains the verb 'modify' which is characteristic of Write operations that alter data or system state reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify-cache-cluster Rate-limited

modify-cache-cluster 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": {
    "modify-cache-cluster": {
      "limits": [
        {
          "counter": "modify-cache-cluster_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 modify-cache-cluster

What does the modify-cache-cluster tool do? +

modify-cache-cluster. 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 modify-cache-cluster? +

Register the Awslabs Valkey MCP server in PolicyLayer and add a rule for modify-cache-cluster: 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 modify-cache-cluster? +

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

Can I rate-limit modify-cache-cluster? +

Yes. Add a rate_limit block to the modify-cache-cluster 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 modify-cache-cluster completely? +

Set action: deny in the PolicyLayer policy for modify-cache-cluster. 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 modify-cache-cluster? +

modify-cache-cluster 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.