create_mailbox · agentsbase — Email for AI Agents MCP

WHAT IT DOES

What create_mailbox does on agentsbase — Email for AI Agents

AI agents use create_mailbox to create or update resources in agentsbase — Email for AI Agents — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your agentsbase — Email for AI Agents environment.

WHY IT NEEDS A POLICY

Why create_mailbox needs a policy

Creating a mailbox is a reversible write operation that adds data/resources to the system. It does not execute arbitrary code, delete data, or move money. Severity is medium because misuse could create spam accounts or bypass email verification controls, but the blast radius is contained to email account creation rather than broader system compromise.

From the tool's definition Tool description states 'Create a new mailbox' — a direct creation/write operation that generates new email infrastructure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_mailbox Rate-limited

create_mailbox 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_mailbox": {
      "limits": [
        {
          "counter": "create_mailbox_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 agentsbase — Email for AI Agents, so you can run agents against it safely.

FAQ

Questions about create_mailbox

What does the create_mailbox tool do? +

Create a new mailbox. Optionally specify a domain to use. It is categorised as a Write tool in the agentsbase — Email for AI Agents 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_mailbox? +

Register the agentsbase — Email for AI Agents MCP server in PolicyLayer and add a rule for create_mailbox: 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 agentsbase — Email for AI Agents. Nothing to install.

What risk level is create_mailbox? +

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

Can I rate-limit create_mailbox? +

Yes. Add a rate_limit block to the create_mailbox 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_mailbox completely? +

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

create_mailbox is provided by the agentsbase — Email for AI Agents MCP server (agentsbase-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.