createContact · Omnisend MCP Server MCP: Risk & Policy

WHAT IT DOES

What createContact does on Omnisend MCP Server

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

WHY IT NEEDS A POLICY

Why createContact needs a policy

This tool creates or modifies contact records in Omnisend, a marketing platform. Creating/updating contacts is a reversible write operation that alters stored data but does not permanently destroy it or move money.

From the tool's definition Tool description states 'Create or update a contact' which are reversible write operations. Contact data includes 'identifiers (email, phone), personal information, subscription status, and custom properties,' indicating modification of customer records in a…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createContact Rate-limited

createContact 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": {
    "createContact": {
      "limits": [
        {
          "counter": "createcontact_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 Omnisend MCP Server, so you can run agents against it safely.

FAQ

Questions about createContact

What does the createContact tool do? +

Create or update a contact in Omnisend. Contact data can include identifiers (email, phone), personal information, subscription status, and custom properties. It is categorised as a Write tool in the Omnisend 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 createContact? +

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

What risk level is createContact? +

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

Can I rate-limit createContact? +

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

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

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