Set the next billing date for a subscription contract
AI agents use set_subscription_contract_next_billing_date to create or update resources in Shopify Graphql — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Shopify Graphql environment.
This tool creates or modifies data reversibly—changing a billing date can be corrected later by setting it again. However, it has high severity because misuse could cause unintended billing timing changes affecting customer subscriptions and financial flows. It does not move money directly (Financial) or irreversibly delete data (Destructive), so Write is the most precise category.
From the tool's definition The tool 'set_subscription_contract_next_billing_date' modifies subscription contract state by changing when the next billing cycle occurs.
Attacks that exploit this kind of access
Set the next billing date for a subscription contract. It is categorised as a Write tool in the Shopify Graphql MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Shopify Graphql MCP server in PolicyLayer and add a rule for set_subscription_contract_next_billing_date: 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 Shopify Graphql. Nothing to install.
set_subscription_contract_next_billing_date is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the set_subscription_contract_next_billing_date 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 set_subscription_contract_next_billing_date. 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.
set_subscription_contract_next_billing_date is provided by the Shopify Graphql MCP server (uvu-store/shopify-graphql-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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