Agent Callback Mailbox

Enables coding agents such as Codex and Claude Code to exchange durable, locally stored messages through shared MCP tools for listing enrolled recipients, sending and replying to messages, reading pending inbox items, acknowledging receipt, and checking message status. Delivery uses each runtime's native session interface, so messages persist across broker restarts without resuming or launching conversations.

Enables agents to communicate asynchronously via private inboxes and to ask a human a question and block until answered. Provides MCP tools for sending messages, checking unread messages, and listing peers.

Provides asynchronous messaging infrastructure for AI agents, enabling them to get permanent addresses and send/receive encrypted messages via MCP tools.

Enables durable agent-to-agent messaging across any MCP client, DSH session, or A2A agent, with threads, receipts, search, broadcast, attachments, presence, SSE streaming, signing, and wake-on-message.