add_subscriber

Add one subscriber. Status is only applied when creating a new contact; use update_subscriber to change an existing contact

SERVERSequenzy Mcp SOURCESequenzy/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/io-github-polnikale-sequenzy-mcp/add-subscriber.md

WHAT IT DOES

What add_subscriber does on Sequenzy Mcp

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

RISK

Why add_subscriber is rated Medium

The tool creates a new subscriber record in the email marketing system, which is a reversible write operation. It does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or query/retrieve data (Read). The scope is limited to a single subscriber addition with low blast radius if misused.

From the tool's definition Tool name: 'add_subscriber'. Description states it adds 'one subscriber' with status applied only 'when creating a new contact', indicating reversible data creation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_subscriber safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Sequenzy Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_subscriber, this is the rule to start with:

add_subscriber Rate-limited

add_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": {
    "add_subscriber": {
      "limits": [
        {
          "counter": "add_subscriber_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 Sequenzy Mcp, apply this rule, and every add_subscriber call is checked against it from then on.

FAQ

Questions about add_subscriber

What does the add_subscriber tool do? +

Add one subscriber. Status is only applied when creating a new contact; use update_subscriber to change an existing contact. It is categorised as a Write tool in the Sequenzy Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_subscriber? +

Register the Sequenzy MCP server in PolicyLayer and add a rule for 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 Sequenzy Mcp. Nothing to install.

What risk level is add_subscriber? +

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

Can I rate-limit add_subscriber? +

Yes. Add a rate_limit block to the 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.

How do I block add_subscriber completely? +

Set action: deny in the PolicyLayer policy for 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.

What MCP server provides add_subscriber? +

add_subscriber is provided by the Sequenzy MCP server (Sequenzy/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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