reset-sandbox-credentials · Mcp Mailtrap MCP: Risk & Policy

WHAT IT DOES

What reset-sandbox-credentials does on Mcp Mailtrap

AI agents use reset-sandbox-credentials 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 reset-sandbox-credentials needs a policy

Resetting SMTP credentials modifies existing data (generates new credentials, invalidating old ones). This is reversible in the sense that new credentials can be generated again, but it does break existing integrations using the old credentials. It's a Write operation as it modifies/overwrites credentials rather than deleting data entirely.

From the tool's definition Reset the SMTP credentials for a sandbox

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reset-sandbox-credentials Rate-limited

reset-sandbox-credentials 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": {
    "reset-sandbox-credentials": {
      "limits": [
        {
          "counter": "reset-sandbox-credentials_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 reset-sandbox-credentials

What does the reset-sandbox-credentials tool do? +

Reset the SMTP credentials for a sandbox. 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 reset-sandbox-credentials? +

Register the Mcp Mailtrap MCP server in PolicyLayer and add a rule for reset-sandbox-credentials: 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 reset-sandbox-credentials? +

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

Can I rate-limit reset-sandbox-credentials? +

Yes. Add a rate_limit block to the reset-sandbox-credentials 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 reset-sandbox-credentials completely? +

Set action: deny in the PolicyLayer policy for reset-sandbox-credentials. 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 reset-sandbox-credentials? +

reset-sandbox-credentials 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.