OpenAI has open-sourced Symphony, a SPEC.md-based reference design for orchestrating multiple autonomous coding agents. Rather than having engineers manually manage a handful of Codex sessions, Symphony uses project-management constructs — issues, tasks, tickets, and milestones — as a control plane. It continuously monitors a task board, assigns each task to a dedicated agent, restarts stalled agents, and surfaces completed work for human review. Agents can also autonomously open new issues for optimization opportunities, though humans must approve them before execution. The reference implementation is written in Elixir for its concurrency primitives, but Symphony is intentionally not a product — it is a specification any organization can use to build its own orchestrator.
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