ck_tag_subscriber · UnClick MCP: Risk & Policy

WHAT IT DOES

What ck_tag_subscriber does on UnClick

AI agents use ck_tag_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.

PARAMETERS

Parameter	Type	Required
`email`	string	Yes
`tag_id`	string	Yes
`api_key`	string	Yes
`first_name`	string	—

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why ck_tag_subscriber needs a policy

This tool modifies subscriber data in ConvertKit by applying a tag, which is a reversible write operation. It does not delete data or trigger code execution. Misuse could result in incorrect tagging of subscribers affecting marketing segmentation.

From the tool's definition Apply a tag to a subscriber in ConvertKit

Risk signalsHandles credentials or secrets (api_key)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ck_tag_subscriber Rate-limited

ck_tag_subscriber 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": {
    "ck_tag_subscriber": {
      "limits": [
        {
          "counter": "ck_tag_subscriber_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches UnClick, so you can run agents against it safely.

FAQ

Questions about ck_tag_subscriber

What does the ck_tag_subscriber tool do? +

Apply a tag to a subscriber in ConvertKit. 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.

What parameters does ck_tag_subscriber accept? +

ck_tag_subscriber accepts 4 parameters: email, tag_id, api_key, first_name. Required: email, tag_id, api_key. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on ck_tag_subscriber? +

Register the UnClick MCP server in PolicyLayer and add a rule for ck_tag_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.

What risk level is ck_tag_subscriber? +

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

Can I rate-limit ck_tag_subscriber? +

Yes. Add a rate_limit block to the ck_tag_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.

How do I block ck_tag_subscriber completely? +

Set action: deny in the PolicyLayer policy for ck_tag_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.

What MCP server provides ck_tag_subscriber? +

ck_tag_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.