update-contact-list · Mcp Mailtrap MCP: Risk & Policy

WHAT IT DOES

What update-contact-list does on Mcp Mailtrap

AI agents use update-contact-list to create or update resources in Mcp Mailtrap — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Mailtrap environment.

WHY IT NEEDS A POLICY

Why update-contact-list needs a policy

This is a Write operation because it updates/modifies data (the contact list name) reversibly. It does not read-only query data (Read), execute arbitrary code (Execute), irreversibly destroy data (Destructive), or move money (Financial).

From the tool's definition The tool 'update-contact-list' with description 'Rename an existing contact list' modifies existing data (a contact list name) in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update-contact-list Rate-limited

update-contact-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": {
    "update-contact-list": {
      "limits": [
        {
          "counter": "update-contact-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 Mcp Mailtrap, so you can run agents against it safely.

FAQ

Questions about update-contact-list

What does the update-contact-list tool do? +

Rename an existing contact list. It is categorised as a Write tool in the Mcp Mailtrap MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update-contact-list? +

Register the Mcp Mailtrap MCP server in PolicyLayer and add a rule for update-contact-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 Mcp Mailtrap. Nothing to install.

What risk level is update-contact-list? +

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

Can I rate-limit update-contact-list? +

Yes. Add a rate_limit block to the update-contact-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 update-contact-list completely? +

Set action: deny in the PolicyLayer policy for update-contact-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 update-contact-list? +

update-contact-list is provided by the Mcp Mailtrap MCP server (mcp-mailtrap). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

update-contact-list is one line of Mcp Mailtrap's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →