policy_create · Awslabs Valkey MCP: Risk & Policy

WHAT IT DOES

What policy_create does on Awslabs Valkey

AI agents use policy_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 policy_create needs a policy

Policy creation is a reversible write operation that modifies access control configurations but does not permanently delete data or execute arbitrary code. The blast radius is medium because misconfigured policies could grant unintended permissions, but the operation is not destructive and can be undone. Confidence is 0.7 due to empty tool description requiring inference from context.

From the tool's definition Tool name 'policy_create' indicates creation of a policy resource. No description provided, but based on sibling tools (add_inline_policy, add_user_to_group) this appears to be an AWS IAM/access control operation that creates or adds policies.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

policy_create Rate-limited

policy_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": {
    "policy_create": {
      "limits": [
        {
          "counter": "policy_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 policy_create

What does the policy_create tool do? +

policy_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 policy_create? +

Register the Awslabs Valkey MCP server in PolicyLayer and add a rule for policy_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 policy_create? +

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

Can I rate-limit policy_create? +

Yes. Add a rate_limit block to the policy_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 policy_create completely? +

Set action: deny in the PolicyLayer policy for policy_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 policy_create? +

policy_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.