> ## Documentation Index
> Fetch the complete documentation index at: https://kindling.birklid.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Symphony

> OpenAI's open-source agent orchestration system — monitors project backlogs, assigns tasks to agents, and verifies completion via CI.

<div style={{display: "flex", gap: "8px", marginBottom: "1.5rem", flexWrap: "wrap"}}>
  <Badge>Open Source</Badge>
  <Badge color="#F97316">Applications Layer</Badge>
</div>

# Symphony

**Autonomous project execution: Symphony watches your backlog, assigns tasks to coding agents, and verifies their work — you manage the work, not the agents.**

<Frame>
  <img src="https://mintcdn.com/tumbleweedlabs/QT0SlrwbzlJBSMcS/images/og-symphony.png?fit=max&auto=format&n=QT0SlrwbzlJBSMcS&q=85&s=7372b5e1df005dff514f03510432dc9a" alt="Symphony GitHub" width="1200" height="600" data-path="images/og-symphony.png" />
</Frame>

<CardGroup cols={4}>
  <Card title="Type" icon="code-branch">Open Source (Apache 2.0)</Card>
  <Card title="Stack Layer" icon="browsers">Applications</Card>
  <Card title="Language" icon="code">Elixir</Card>
  <Card title="Stars" icon="star">22.8k+</Card>
</CardGroup>

## What it is

Symphony is OpenAI's reference implementation of an agent orchestration system for software development. It shifts the developer's role from supervising individual agents to managing work queues: Symphony monitors a project backlog (e.g., a Linear board), autonomously assigns tasks to coding agents, and verifies completion through CI status and code review. The model is "isolated, autonomous implementation runs" — each task is a self-contained agent session, reducing the interference and state accumulation that plagues long-running agents.

The repo includes both a detailed specification document and an experimental Elixir implementation. It's positioned for engineering teams that have already adopted harness engineering practices and want to scale agent usage across a full development backlog without individual supervision.

<Tip>
  **Use this when** your team has moved beyond one-off AI coding sessions and wants autonomous agents working through a project backlog continuously, verified by your existing CI pipeline.
</Tip>

## Get started

<CardGroup cols={2}>
  <Card title="GitHub ↗" icon="github" href="https://github.com/openai/symphony">
    Spec document, Elixir reference implementation, and architecture notes.
  </Card>
</CardGroup>

## Related tools

<CardGroup cols={2}>
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  </Card>

  <Card title="HumanLayer" icon="github" href="/library/control-surfaces/humanlayer">
    Claude Code IDE for scaling AI-assisted development organization-wide.
  </Card>
</CardGroup>