An open-source spec for Codex orchestration: Symphony

· ai-agents coding · Source ↗

TLDR

  • OpenAI released Symphony, an open-source spec that turns issue trackers like Linear into always-on orchestrators for coding agents.

Key Facts

  • Symphony assigns every open task to a Codex agent automatically; humans review results rather than supervise sessions.
  • Teams using Symphony saw landed pull requests increase 500% in the first three weeks on some teams.
  • The core of Symphony is a SPEC.md file; the reference implementation is written in Elixir, chosen for its concurrency primitives.
  • Codex built the Elixir reference implementation in one shot and was also used to implement Symphony in TypeScript, Go, Rust, Java, and Python to surface ambiguities.

Why It Matters

  • Moving orchestration to the issue tracker removes the human-attention bottleneck that caps how many concurrent agent sessions engineers can manage.
  • Because the spec is a Markdown document, teams can point any coding agent at it and generate their own implementation.

OpenAI · 2026-04-27 · Read the original

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