applySubscriptionChange

SERVERStable Baseline SOURCEhttps://api.stablebaseline.io/functions/v1/cloud-serve/mcp

Critical RISK CLASS

Category Financial

Parameters 11 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-stablebaseline-sb/applysubscriptionchange.md

WHAT IT DOES

What applySubscriptionChange does on Stable Baseline

AI agents use applySubscriptionChange 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.

RISK

Why applySubscriptionChange is rated Critical

This tool directly modifies a Stripe subscription, which commits financial obligations. It can upgrade/change subscription tiers, triggering billing charges. The explicit mention of Stripe, pricing confirmation, and checkout URLs confirms financial transactions are involved. Misuse could result in unauthorized charges to a customer's payment method, making this critical severity.

From the tool's definition Apply a previously previewed subscription change... update Stripe in place... cross-tier upgrades from Free return a hosted Checkout URL... Rate limit 5/h

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs applySubscriptionChange 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 applySubscriptionChange, this is the rule to start with:

applySubscriptionChange Approval-gated

Any call to applySubscriptionChange is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "applySubscriptionChange": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Stable Baseline, apply this rule, and every applySubscriptionChange call is checked against it from then on.

FAQ

Questions about applySubscriptionChange

What does the applySubscriptionChange tool do? +

Apply a previously previewed subscription change. Same-tier seat changes update Stripe in place; cross-tier upgrades from Free return a hosted Checkout URL. Refuses target=free (use cancelSubscription) and target=enterprise (sales-led). Rate limit 5/h. Use only AFTER previewSubscriptionChange and after the user confirms the preview's pricing — never call apply without the user seeing 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.

What parameters does applySubscriptionChange accept? +

applySubscriptionChange accepts 1 parameter: confirmation_token. Required: confirmation_token. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on applySubscriptionChange? +

Register the Stable Baseline MCP server in PolicyLayer and add a rule for applySubscriptionChange: 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.

What risk level is applySubscriptionChange? +

applySubscriptionChange is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit applySubscriptionChange? +

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

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

applySubscriptionChange 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.

KEEP EXPLORING

More on Stable Baseline, and thousands of servers like it.

This server

All 196 Stable Baseline tools → Critical-risk tools on this server →

Across the catalogue

All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →