memory_create · Awslabs Valkey MCP: Risk & Policy

WHAT IT DOES

What memory_create does on Awslabs Valkey

AI agents use memory_create 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 memory_create needs a policy

The 'create' verb indicates a write operation that creates new data structures or entries in the Valkey cache. This is reversible (can be deleted/overwritten) and has moderate blast radius if misused to create malicious cache entries or exhaust resources. Without a description, confidence is reduced but the naming convention strongly suggests write semantics rather than read, execute, or destructive actions.

From the tool's definition Tool name 'memory_create' suggests creation of memory/cache entries in ElastiCache/MemoryDB Valkey service. The name follows the 'create' pattern which indicates data creation. Description is empty, limiting precision.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memory_create Rate-limited

memory_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "memory_create": {
      "limits": [
        {
          "counter": "memory_create_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 memory_create

What does the memory_create tool do? +

memory_create. 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 memory_create? +

Register the Awslabs Valkey MCP server in PolicyLayer and add a rule for memory_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 Awslabs Valkey. Nothing to install.

What risk level is memory_create? +

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

Can I rate-limit memory_create? +

Yes. Add a rate_limit block to the memory_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 memory_create completely? +

Set action: deny in the PolicyLayer policy for memory_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 memory_create? +

memory_create 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.