AI agents call list_subscription_plans to retrieve information from PayPal without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists existing subscription plans without creating, modifying, deleting, or executing any financial transactions. It is a read-only operation that queries data from PayPal's subscription plan catalog. The low severity reflects that listing plans poses minimal risk—an agent could retrieve subscription information but cannot execute financial obligations or modify data.
From the tool's definition Tool name 'list_subscription_plans' and description 'List subscription plans' indicate a query/retrieval operation with no data modification.
Documented attack patterns abuse exactly the kind of access list_subscription_plans gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PayPal, and nothing reaches the server without passing your rules. This is the rule we recommend for list_subscription_plans:
{
"version": "1",
"default": "deny",
"tools": {
"list_subscription_plans": {}
}
}list_subscription_plans is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List subscription plans. It is categorised as a Read tool in the PayPal MCP Server, which means it retrieves data without modifying state.
Register the PayPal MCP server in PolicyLayer and add a rule for list_subscription_plans: 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 PayPal. Nothing to install.
list_subscription_plans is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_subscription_plans 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 list_subscription_plans. 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.
list_subscription_plans is provided by the PayPal MCP server (paypal/agent-toolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 30 PayPal tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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30 PayPal tools catalogued and risk-classified — across an index of 42,500+ MCP servers.