create_subscription

Create a manual, non-renewing subscription record for a member. Use a subscription action link for provider-backed recurring billing.

SERVERFavCRM SOURCEhttps://api.favcrm.io/mcp

Medium RISK CLASS

Category Write

Parameters 81 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-favcrm-favcrm/create-subscription.md

WHAT IT DOES

What create_subscription does on FavCRM

AI agents use create_subscription to create or update resources in FavCRM, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FavCRM environment.

Parameter	Type	Required	Description
`amount`	number	—	Override amount per cycle (otherwise derived from tier)
`tierId`	string	—	Membership tier ID — if set, amount/currency default from the tier
`currency`	string	—	ISO currency code (otherwise derived from tier or company default)
`accountId`	string	Yes	Customer accountId
`autoRenew`	boolean	—	Manual records cannot auto-renew
`billingCycle`	string	—	Billing cycle (default monthly)
`currentPeriodEnd`	string	—	Period end (ISO 8601). Defaults to start + cycle.
`currentPeriodStart`	string	—	Period start (ISO 8601). Defaults to now.

Parameters from the server's own tool schema.

RISK

Why create_subscription is rated Medium

An AI agent can call create_subscription faster than any human can review: one bad instruction and it creates or modifies resources in FavCRM by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

create_subscription Rate-limited

create_subscription stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_subscription": {
      "limits": [
        {
          "counter": "create_subscription_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about create_subscription

What does the create_subscription tool do? +

Create a manual, non-renewing subscription record for a member. Use a subscription action link for provider-backed recurring billing. It is categorised as a Write tool in the FavCRM MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does create_subscription accept? +

create_subscription accepts 8 parameters: amount, tierId, currency, accountId, autoRenew, billingCycle, currentPeriodEnd, currentPeriodStart. Required: accountId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on create_subscription? +

Register the FavCRM MCP server in PolicyLayer and add a rule for create_subscription: 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.

What risk level is create_subscription? +

create_subscription is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_subscription? +

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

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

create_subscription 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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