create-cache · Momento MCP Server MCP: Risk & Policy

WHAT IT DOES

What create-cache does on Momento MCP Server

AI agents use create-cache to create or update resources in Momento MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Momento MCP Server environment.

WHY IT NEEDS A POLICY

Why create-cache needs a policy

This tool creates a new cache resource, which is a reversible write operation. The cache can be deleted later if needed. While it consumes resources and could be misused to create numerous caches (resource exhaustion/DoS risk), it does not delete data, execute arbitrary code, or move money.

From the tool's definition Tool name is 'create-cache' and description states 'Creates a new cache', indicating creation of a new resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create-cache Rate-limited

create-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": {
    "create-cache": {
      "limits": [
        {
          "counter": "create-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 Momento MCP Server, so you can run agents against it safely.

FAQ

Questions about create-cache

What does the create-cache tool do? +

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

How do I enforce a policy on create-cache? +

Register the Momento MCP Server MCP server in PolicyLayer and add a rule for create-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 Momento MCP Server. Nothing to install.

What risk level is create-cache? +

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

Can I rate-limit create-cache? +

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

Set action: deny in the PolicyLayer policy for create-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 create-cache? +

create-cache is provided by the Momento MCP Server MCP server (momentohq/mcp-momento). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.