unsubscribe_subscriber · Sitecore Send MCP: Risk & Policy

WHAT IT DOES

What unsubscribe_subscriber does on Sitecore Send

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

WHY IT NEEDS A POLICY

Why unsubscribe_subscriber needs a policy

Unsubscribing a subscriber modifies their subscription status in the mailing list. This is a reversible write operation (the subscriber could potentially be re-added), not a full deletion of the subscriber record. However, it could cause unintended communication gaps if misused, warranting a medium severity.

From the tool's definition "Unsubscribe subscriber from a mailing list"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unsubscribe_subscriber Rate-limited

unsubscribe_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": {
    "unsubscribe_subscriber": {
      "limits": [
        {
          "counter": "unsubscribe_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 Sitecore Send, so you can run agents against it safely.

FAQ

Questions about unsubscribe_subscriber

What does the unsubscribe_subscriber tool do? +

Unsubscribe subscriber from a mailing list. It is categorised as a Write tool in the Sitecore Send MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unsubscribe_subscriber? +

Register the Sitecore Send MCP server in PolicyLayer and add a rule for unsubscribe_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 Sitecore Send. Nothing to install.

What risk level is unsubscribe_subscriber? +

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

Can I rate-limit unsubscribe_subscriber? +

Yes. Add a rate_limit block to the unsubscribe_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 unsubscribe_subscriber completely? +

Set action: deny in the PolicyLayer policy for unsubscribe_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 unsubscribe_subscriber? +

unsubscribe_subscriber is provided by the Sitecore Send MCP server (izharikov/send-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.