enrol_membership
Enrol a member into a membership tier. Free tiers enrol immediately; paid tiers return PAYMENT_REQUIRED unless skipPriceCheck is set. Use list_tiers first to find the target tier.
This record as markdown: /tools/io-favcrm-favcrm/enrol-membership.md
What enrol_membership does on FavCRM
AI agents use enrol_membership to commit financial operations through FavCRM, usually the final step of a payment, billing, or trading workflow. A call moves real money.
| Parameter | Type | Required | Description |
|---|---|---|---|
tierId | string | — | The membership tier ID. Omit to enrol on the default no-tier membership. |
accountId | string | Yes | The member/account ID to enrol |
expiresAt | string | — | Optional ISO date to override the tier-computed expiry. |
Parameters from the server's own tool schema.
Why enrol_membership is rated Critical
The tool directly triggers or initiates payment obligations for paid membership tiers. Even if free tiers are immediate, the tool's design around 'skipPriceCheck' and 'PAYMENT_REQUIRED' responses indicates it can commit financial transactions, placing it in the Financial category as the most severe applicable.
From the tool's definition paid tiers return PAYMENT_REQUIRED unless skipPriceCheck is set — enrolling a member into a paid membership tier commits a financial obligation
Attacks that exploit this kind of access
The rule that runs enrol_membership safely
PolicyLayer is an MCP gateway: it sits between your AI agents and FavCRM, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For enrol_membership, this is the rule to start with:
Any call to enrol_membership is blocked until a human approves it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect FavCRM, apply this rule, and every enrol_membership call is checked against it from then on.
Questions about enrol_membership
Enrol a member into a membership tier. Free tiers enrol immediately; paid tiers return PAYMENT_REQUIRED unless skipPriceCheck is set. Use list_tiers first to find the target tier. It is categorised as a Financial tool in the FavCRM MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
enrol_membership accepts 3 parameters: tierId, accountId, expiresAt. Required: accountId. The full parameter table on this page comes from the server's own tool schema.
Register the FavCRM MCP server in PolicyLayer and add a rule for enrol_membership: 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 FavCRM. Nothing to install.
enrol_membership 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 enrol_membership 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 enrol_membership. 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.
enrol_membership is provided by the FavCRM MCP server (https://api.favcrm.io/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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