AI agents use ck_add_subscriber to create or update resources in UnClick — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UnClick environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
email | string | Yes | |
api_key | string | Yes | ConvertKit API key |
form_id | string | Yes | |
first_name | string | — |
Parameters from the server's own tool schema.
This tool creates a new subscriber record, which is a reversible write operation (emails can be unsubscribed). It has medium severity because misuse could add unwanted addresses to mailing lists, but the impact is not destructive (no data deletion), financial (no money moved), or executing arbitrary external code. The tool modifies data in a controlled, predictable manner through the ConvertKit API.
From the tool's definition Subscribe an email address to a ConvertKit form. The verb 'subscribe' indicates data creation (adding a new email subscriber record) with side effects that modify the ConvertKit database.
Risk signalsHandles credentials or secrets (api_key)
Attacks that exploit this kind of access
Subscribe an email address to a ConvertKit form. It is categorised as a Write tool in the UnClick MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
ck_add_subscriber accepts 4 parameters: email, api_key, form_id, first_name. Required: email, api_key, form_id. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for ck_add_subscriber: 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 UnClick. Nothing to install.
ck_add_subscriber is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the ck_add_subscriber 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 ck_add_subscriber. 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.
ck_add_subscriber is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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