change_plan
Switch the project owner between Pro and Scale, or cancel the subscription (effectively dropping to Free at period end). Returns {kind, newPlan, effectiveAt, applied} — applied=true means Paddle was charged immediately, otherwise the change is queued for the current period end. Use preview_plan_c...
This record as markdown: /tools/dev-echorelay-management/change-plan.md
What change_plan does on EchoRelay
AI agents use change_plan to commit financial operations through EchoRelay, usually the final step of a payment, billing, or trading workflow. A call moves real money.
| Parameter | Type | Required | Description |
|---|---|---|---|
plan | string | Yes |
Parameters from the server's own tool schema.
Why change_plan is rated Critical
This tool directly commits financial transactions — it can immediately charge a customer via Paddle or alter their subscription tier. It involves billing scope, real money movement, and subscription lifecycle changes, placing it firmly in the Financial category with critical severity due to potential for unexpected charges or service disruption.
From the tool's definition Switch the project owner between Pro and Scale, or cancel the subscription... `applied=true` means Paddle was charged immediately
Attacks that exploit this kind of access
The rule that runs change_plan 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 change_plan, this is the rule to start with:
Any call to change_plan 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 change_plan call is checked against it from then on.
Questions about change_plan
Switch the project owner between Pro and Scale, or cancel the subscription (effectively dropping to Free at period end). Returns {kind, newPlan, effectiveAt, applied} — applied=true means Paddle was charged immediately, otherwise the change is queued for the current period end. Use preview_plan_change first to see the dollar impact. 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.
change_plan accepts 1 parameter: plan. Required: plan. The full parameter table on this page comes from the server's own tool schema.
Register the EchoRelay MCP server in PolicyLayer and add a rule for change_plan: 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.
change_plan 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 change_plan 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 change_plan. 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.
change_plan 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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