> ## 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.

# HumanLayer

> Open-source IDE built on Claude Code for scaling AI-assisted development — parallel sessions, keyboard-first workflows, and context engineering.

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

# HumanLayer

**Claude Code at scale — a keyboard-first IDE that manages parallel AI sessions, bakes in context engineering practices, and ships the 12 Factor Agents framework.**

<Frame>
  <img src="https://mintcdn.com/tumbleweedlabs/QT0SlrwbzlJBSMcS/images/og-humanlayer.png?fit=max&auto=format&n=QT0SlrwbzlJBSMcS&q=85&s=69d5fbf2914a3f3e8cf164d1558f4318" alt="HumanLayer GitHub" width="1200" height="600" data-path="images/og-humanlayer.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">TypeScript</Card>
  <Card title="Stars" icon="star">10.7k+</Card>
</CardGroup>

## What it is

Originally a human-in-the-loop approval SDK for AI agents, HumanLayer has evolved into CodeLayer — an open-source IDE built on top of Claude Code for teams that want to scale AI-first development organization-wide. It provides keyboard-first workflows, parallel multi-Claude session management, and advanced context engineering patterns baked into the tooling. The project also originated the widely-cited "12 Factor Agents" and "Context Engineering" frameworks.

The focus is preventing "slop" — the low-quality output that results from poorly managed agents operating without sufficient context or oversight. CodeLayer structures how developers interact with Claude Code to produce consistently high-quality results, especially across complex multi-file codebases.

<Tip>
  **Use this when** you're running Claude Code seriously across a team and want structured workflows, parallel session management, and context engineering best practices built into your tooling.
</Tip>

## Get started

<CardGroup cols={2}>
  <Card title="GitHub ↗" icon="github" href="https://github.com/humanlayer/humanlayer">
    Source, 12 Factor Agents framework, and setup.
  </Card>
</CardGroup>

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<CardGroup cols={2}>
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  <Card title="Symphony" icon="github" href="/library/agents/symphony">
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  </Card>
</CardGroup>