cancelSubscription
Apply a previewed soft cancellation (cancel_at_period_end=true). Customer keeps full access until period end. Rate limit 5/h. Use only AFTER previewSubscriptionCancellation and after the user confirms — never cancel without showing the preview first.
This record as markdown: /tools/io-stablebaseline-sb/cancelsubscription.md
What cancelSubscription does on Stable Baseline
AI agents use cancelSubscription to commit financial operations through Stable Baseline, usually the final step of a payment, billing, or trading workflow. A call moves real money.
| Parameter | Type | Required | Description |
|---|---|---|---|
confirmation_token | string | Yes |
Parameters from the server's own tool schema.
Why cancelSubscription is rated Critical
This tool commits a financial action by cancelling a subscription, directly affecting billing and service obligations. Even though access continues until period end, it is an irreversible financial commitment (cancellation) that cannot be undone without re-subscribing.
From the tool's definition cancelSubscription, 'Apply a previewed soft cancellation (cancel_at_period_end=true)', 'never cancel without showing the preview first'
Attacks that exploit this kind of access
The rule that runs cancelSubscription safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Stable Baseline, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For cancelSubscription, this is the rule to start with:
Any call to cancelSubscription is blocked until a human approves it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Stable Baseline, apply this rule, and every cancelSubscription call is checked against it from then on.
Questions about cancelSubscription
Apply a previewed soft cancellation (cancel_at_period_end=true). Customer keeps full access until period end. Rate limit 5/h. Use only AFTER previewSubscriptionCancellation and after the user confirms — never cancel without showing the preview first. It is categorised as a Financial tool in the Stable Baseline MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
cancelSubscription accepts 1 parameter: confirmation_token. Required: confirmation_token. The full parameter table on this page comes from the server's own tool schema.
Register the Stable Baseline MCP server in PolicyLayer and add a rule for cancelSubscription: 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 Stable Baseline. Nothing to install.
cancelSubscription 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 cancelSubscription 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 cancelSubscription. 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.
cancelSubscription is provided by the Stable Baseline MCP server (https://api.stablebaseline.io/functions/v1/cloud-serve/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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