custom_create_email_template · Marketo MCP Server MCP

WHAT IT DOES

What custom_create_email_template does on Marketo MCP Server

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

WHY IT NEEDS A POLICY

Why custom_create_email_template needs a policy

This tool creates or modifies email templates in Marketo, which is a write operation (not read-only retrieval, not irreversible deletion, not financial). The blast radius is high because a malicious or misconfigured email template could be used to send phishing or spam campaigns to Marketo's contact database, but the action itself is reversible by deleting or modifying the template afterward.

From the tool's definition Tool name 'custom_create_email_template' explicitly indicates creation of a new email template. Description states it 'Calls the Marketo REST API directly' for template creation, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

custom_create_email_template Rate-limited

custom_create_email_template 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": {
    "custom_create_email_template": {
      "limits": [
        {
          "counter": "custom_create_email_template_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 Marketo MCP Server, so you can run agents against it safely.

FAQ

Questions about custom_create_email_template

What does the custom_create_email_template tool do? +

[CUSTOM] Calls the Marketo REST API directly (not Adobe's native MCP). It is categorised as a Write tool in the Marketo MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on custom_create_email_template? +

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

What risk level is custom_create_email_template? +

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

Can I rate-limit custom_create_email_template? +

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

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

custom_create_email_template is provided by the Marketo MCP Server MCP server (tyron-pretorius/marketo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.