get_message_types

THE RISK

Low Risk

Why get_message_types needs a policy

This tool retrieves metadata about message types available in the Iterable platform. It queries existing data to enumerate available options for template creation, which is a read-only operation with no mutations, deletions, or external side effects. No data is created, modified, or deleted.

From the tool's definition Tool name 'get_message_types' and description 'Get all message types within the project for use in templates' indicate a retrieval operation with no side effects.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access get_message_types gives an agent:

POLICY

How to control get_message_types

PolicyLayer is an MCP gateway — it sits between your AI agents and Iterable MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_message_types:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_message_types": {}
  }
}

get_message_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Iterable MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_message_types

What does the get_message_types tool do? +

Get all message types within the project for use in templates. It is categorised as a Read tool in the Iterable MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_message_types? +

Register the Iterable MCP Server MCP server in PolicyLayer and add a rule for get_message_types: 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 Iterable MCP Server. Nothing to install.

What risk level is get_message_types? +

get_message_types is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_message_types? +

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

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

get_message_types is provided by the Iterable MCP Server MCP server (iterable/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Iterable MCP Server tool call.

Start from Iterable MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →