update_subscription · Creem MCP: Risk & Policy

WHAT IT DOES

What update_subscription does on Creem

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

WHY IT NEEDS A POLICY

Why update_subscription needs a policy

This tool creates or modifies subscription data reversibly—specifically changing subscription parameters like seat counts or units. While it affects financially-relevant entities, it does not itself move money or create new financial obligations (that would be create_checkout or similar); it modifies existing subscriptions.

From the tool's definition Tool description states 'Update subscription (e.g., change number of seats/units)' which modifies existing subscription data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_subscription Rate-limited

update_subscription 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": {
    "update_subscription": {
      "limits": [
        {
          "counter": "update_subscription_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Creem, so you can run agents against it safely.

FAQ

Questions about update_subscription

What does the update_subscription tool do? +

Update subscription (e.g., change number of seats/units). It is categorised as a Write tool in the Creem MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_subscription? +

Register the Creem MCP server in PolicyLayer and add a rule for update_subscription: 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 Creem. Nothing to install.

What risk level is update_subscription? +

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

Can I rate-limit update_subscription? +

Yes. Add a rate_limit block to the update_subscription 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 update_subscription completely? +

Set action: deny in the PolicyLayer policy for update_subscription. 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 update_subscription? +

update_subscription is provided by the Creem MCP server (selenium39/mcp-server-creem). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.