AI agents use upgrade_subscription to commit financial operations through Creem — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Changing a subscription plan commits the customer (or merchant) to a different payment amount going forward. This is a financial operation with real monetary consequences — upgrading increases charges, downgrading reduces revenue. Either direction constitutes a financial commitment change, placing it firmly in the Financial category with critical severity due to the potential for unintended billing changes at scale.
From the tool's definition 'Upgrade or downgrade a subscription to a different product' — modifies an active subscription's billing tier, directly affecting recurring financial obligations
Attacks that exploit this kind of access
Upgrade or downgrade a subscription to a different product. It is categorised as a Financial tool in the Creem MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Creem MCP server in PolicyLayer and add a rule for upgrade_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.
upgrade_subscription is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the upgrade_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.
Set action: deny in the PolicyLayer policy for upgrade_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.
upgrade_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.
upgrade_subscription is one line of Creem's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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