updateContact · Omnisend MCP Server MCP: Risk & Policy

WHAT IT DOES

What updateContact does on Omnisend MCP Server

AI agents use updateContact 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 updateContact needs a policy

This tool creates or modifies contact data reversibly. Updates can be undone through subsequent operations (re-update, revert), making it Write rather than Destructive. The blast radius is medium because incorrect contact updates could affect marketing campaigns, customer communications, or data integrity across the Omnisend platform, but the changes are not permanent or irreversible.

From the tool's definition Tool name 'updateContact' and description 'Update an existing contact' indicate modification of existing data in the Omnisend platform's contact database.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

updateContact Rate-limited

updateContact 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": {
    "updateContact": {
      "limits": [
        {
          "counter": "updatecontact_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 updateContact

What does the updateContact tool do? +

Update an existing contact. 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 updateContact? +

Register the Omnisend MCP Server MCP server in PolicyLayer and add a rule for updateContact: 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 updateContact? +

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

Can I rate-limit updateContact? +

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

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

updateContact 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.