Async inbox protocol for agent-to-agent task handoff

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Builders running multi-agent systems are hitting the wall on handoff: there's no standard for one agent on machine A to hand work to another agent on machine B with state, encryption, and approval gates. r/AI_Agents and r/buildinpublic threads in early May 2026 surfaced the same shape repeatedly, 'addressable workers with message transport.' Existing options are either full orchestration frameworks (heavy) or DIY webhooks (no semantics).

builder note

Resist the urge to write the protocol first. Ship a hosted inbox with three operations (post, claim, ack) and a CLI. Get five real multi-agent users on it before you propose anything called a standard.

landscape (3 existing solutions)

Every option is either too big (orchestration platform) or too small (raw HTTP). The agent-to-agent inbox is a real protocol shape that nobody owns yet. First mover who keeps the spec small and the SDK boring wins.

LangGraph Solves graph-of-agents inside one process or one platform. Cross-machine, cross-tenant handoff with encrypted payload and human approval is not the primary use case. You end up bolting it on top.

Temporal Bullet-proof durable execution but a heavyweight commitment, and the developer ergonomics are oriented at workflow engineers, not agent builders. Onboarding tax is the killer.

MCP (Anthropic) Defines tool/context exchange between agent and tool, not async task handoff between two agents on different machines. Different protocol layer.

sources (2)

other https://dev.to/liv_melendez_4be3c47ea998/what-the-ai-agent-c... "Asynchronous messaging, encrypted task handoff across machines, addressable worker models" 2026-05-10

other https://github.com/Zijian-Ni/awesome-ai-agents-2026 "Long-running autonomy still breaks on state handoff and cold-start re-reading" 2026-05-23

ai-agentsinfrastructureprotocolmessagingorchestration