cancel_subscription
Schedule the project owner's subscription for cancellation at the end of the current billing period. Returns {kind: 'scheduled', newPlan: 'free', effectiveAt}. Add-ons keep renewing while the plan is active; after it ends they stop renewing and each already-paid add-on cycle stays active until it...
This record as markdown: /tools/dev-echorelay-management/cancel-subscription.md
What cancel_subscription does on EchoRelay
AI agents use cancel_subscription to commit financial operations through EchoRelay, usually the final step of a payment, billing, or trading workflow. A call moves real money.
Why cancel_subscription is rated Critical
Cancelling a subscription is a financial operation that ends a billing commitment and downgrades the plan to free. While it is scheduled (not immediate), it irreversibly changes the financial relationship unless explicitly reversed, placing it firmly in the Financial category. Misuse by an AI agent could result in service disruption and loss of paid features for the project owner.
From the tool's definition 'Schedule the project owner's subscription for cancellation at the end of the current billing period' and 'requires a token minted with the billing scope' — this tool commits a financial action by terminating a paid subscription plan
Attacks that exploit this kind of access
The rule that runs cancel_subscription safely
PolicyLayer is an MCP gateway: it sits between your AI agents and EchoRelay, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For cancel_subscription, this is the rule to start with:
Any call to cancel_subscription is blocked until a human approves it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect EchoRelay, apply this rule, and every cancel_subscription call is checked against it from then on.
Questions about cancel_subscription
Schedule the project owner's subscription for cancellation at the end of the current billing period. Returns {kind: 'scheduled', newPlan: 'free', effectiveAt}. Add-ons keep renewing while the plan is active; after it ends they stop renewing and each already-paid add-on cycle stays active until its own end date (use unsubscribe_addon to stop one sooner). Owner-only; requires a token minted with the billing scope. It is categorised as a Financial tool in the EchoRelay MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the EchoRelay MCP server in PolicyLayer and add a rule for cancel_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 EchoRelay. Nothing to install.
cancel_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 cancel_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 cancel_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.
cancel_subscription is provided by the EchoRelay MCP server (https://mcp.echorelay.dev). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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