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

WHAT IT DOES

What modify-serverless-cache does on Awslabs Valkey

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

The tool modifies AWS cache infrastructure parameters reversibly without irreversibly deleting data (which would be Destructive) or executing arbitrary code (which would be Execute). Modification of cloud infrastructure carries medium blast radius due to potential for configuration errors affecting availability or performance, but changes are typically reversible.

From the tool's definition Tool name 'modify-serverless-cache' indicates modification of serverless cache infrastructure; empty description limits confidence but the verb 'modify' clearly signals a Write operation that alters AWS ElastiCache/MemoryDB Valkey configuration or state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify-serverless-cache Rate-limited

modify-serverless-cache 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-serverless-cache": {
      "limits": [
        {
          "counter": "modify-serverless-cache_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-serverless-cache

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

modify-serverless-cache. 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-serverless-cache? +

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

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

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

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

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

modify-serverless-cache 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.