contact_with_list · Brevo MCP Server MCP: Risk & Policy

WHAT IT DOES

What contact_with_list does on Brevo MCP Server

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

WHY IT NEEDS A POLICY

Why contact_with_list needs a policy

This tool writes new data (contact creation) and performs a list association. Both operations are reversible (contact can be deleted, list membership can be removed), placing this firmly in the Write category. Misuse could result in unwanted contacts being created or added to marketing lists, hence medium severity.

From the tool's definition 'Create contact and add to list in one call' — creates a new contact record and associates it with a list

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

contact_with_list Rate-limited

contact_with_list 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": {
    "contact_with_list": {
      "limits": [
        {
          "counter": "contact_with_list_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 Brevo MCP Server, so you can run agents against it safely.

FAQ

Questions about contact_with_list

What does the contact_with_list tool do? +

Create contact and add to list in one call - universally useful combination. It is categorised as a Write tool in the Brevo 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 contact_with_list? +

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

What risk level is contact_with_list? +

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

Can I rate-limit contact_with_list? +

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

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

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