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

WHAT IT DOES

What update-contact-field does on Mcp Mailtrap

AI agents use update-contact-field 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-field needs a policy

This tool creates or modifies contact field definitions reversibly. The update operation is not destructive (data can be modified again) and does not delete or permanently remove information. It falls under Write category as it modifies data schemas/definitions.

From the tool's definition Tool name 'update-contact-field' combined with description stating 'Update a contact field definition' indicates modification of existing data structures.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update-contact-field Rate-limited

update-contact-field 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-field": {
      "limits": [
        {
          "counter": "update-contact-field_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-field

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

Update a contact field definition. Any combination of. 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-field? +

Register the Mcp Mailtrap MCP server in PolicyLayer and add a rule for update-contact-field: 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-field? +

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

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

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

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

update-contact-field 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.