Agent Relay

Turn coding agents into a working team.

Agent Relay is an open-source infrastructure platform for coordinating multiple coding agents, such as Claude and Codex, across shared work, approvals, and long-running workflows. It addresses the problem of agents operating in isolation by providing channels and messaging for collaboration, durable workflow execution with persistence and retries, a shared filesystem, real-time events, and searchable history so decisions remain recoverable.

Core capabilities include channels, threads, reactions, DMs, and @mentions for routing handoffs; a PTY-based driver that can power any CLI agent; an SDK for registering tools, validating inputs, and receiving callbacks; MCP and CLI surfaces for exposing actions to agents; A2A Agent Card support for discovery and calls over the Agent2Agent protocol; a queue-first virtual filesystem-over-REST with conflict-safe writeback, retries, dead-lettering, and replay; and a WebSocket stream for live events covering agent lifecycle, messages, reactions, threads, and action calls. Workflows can be triggered from schedules and events, with per-step retries and a run history tracing inputs, outputs, model actions, artifacts, and interventions.

Agent Relay is intended for teams building agent-centered workflows and products. It is open source and can be self-hosted or used through a hosted cloud option, with a free tier available for the hosted service.

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