Manage and delegate work to Mermail mailbox-agent conversations from Claude, Codex, or another external MCP client. Use when a user explicitly wants to create, list, continue, rename, or delete a mailbox-agent conversation, inspect its history, or ask the Mermail mailbox Assistant to work on a mailbox task. Do not use for generic email search, OTP retrieval, direct email composition without delegation, triager configuration, or Agent Wallet operations.