Create a project-scoped email mailbox at <slug>@mail.run402.com. Returns mailbox_settings and next_actions when the gateway provides default-role repair guidance. Not idempotent: slug conflicts/cooldowns/limit errors are surfaced.
AI agents use create_mailbox to create or update resources in Run402 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Run402 environment.
This tool creates new email infrastructure that is reversible (mailboxes can be deleted/recreated). While it modifies system state and adds a new resource, it does not irreversibly destroy data, execute arbitrary code, handle financial transactions, or delete resources. The primary concern is that an AI agent could create excessive mailboxes or configure them inappropriately, affecting project email infrastructure.
From the tool's definition The tool description explicitly states 'Create a project-scoped email mailbox' which is a creation operation that modifies system state by adding a new resource.
Attacks that exploit this kind of access
Create a project-scoped email mailbox at <slug>@mail.run402.com. Returns mailbox_settings and next_actions when the gateway provides default-role repair guidance. Not idempotent: slug conflicts/cooldowns/limit errors are surfaced. It is categorised as a Write tool in the Run402 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Run402 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 Run402. Nothing to install.
create_mailbox is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
create_mailbox is provided by the Run402 MCP server (kychee-com/run402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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