create_contact · Unosend MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_contact does on Unosend MCP Server

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

WHY IT NEEDS A POLICY

Why create_contact needs a policy

Adding a contact to an audience is a reversible write operation that modifies contact data without deleting or causing destructive changes. It's less severe than Execute (no code execution) or Destructive (not irreversible), but has medium severity due to potential spam/data integrity issues if misused (an AI could add malicious contacts or spam lists).

From the tool's definition Tool description states 'Add a contact to an audience' — this creates/modifies contact data. The Unosend server enables 'emails and SMS messages' and 'contact list operations', indicating this tool writes to a contact management system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_contact Rate-limited

create_contact 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": {
    "create_contact": {
      "limits": [
        {
          "counter": "create_contact_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 Unosend MCP Server, so you can run agents against it safely.

FAQ

Questions about create_contact

What does the create_contact tool do? +

Add a contact to an audience. It is categorised as a Write tool in the Unosend 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 create_contact? +

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

What risk level is create_contact? +

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

Can I rate-limit create_contact? +

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

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

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