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

# Welcome

> The governed knowledge graph your AI agents read before they act.

<Warning>
  **Early access** — Product Brain is in hosted beta. Some surfaces in these docs may not be visible on every account yet. For early access, help, and release notes, [**join the Product Brain Community**](https://community.productbrain.io).
</Warning>

# Product Brain

*The governed knowledge graph your AI agents read before they act.*

Product knowledge usually scatters — across docs, chats, and people's heads. Product Brain stores it as a typed, governed graph called the **Chain**, and your AI tools read it on every prompt.

## What brings you here?

Use the **tabs** above after you pick a path:

1. **[Try it](/docs/quickstart)** — Open **Cortex** (our web app). Your first capture in about five minutes, no MCP install.
2. **[Connect](/docs/integrations/overview)** — Your **host environment** is Cursor, Claude, ChatGPT, Codex, or another MCP client. Pick your tool and install the **wiring** that connects it to the Chain.
3. **[Learn](/docs/the-chain)** — What the **Chain** is, why it exists, how it's governed — the model for CPOs, leads, and investors.
4. **For engineers and power users** — **[Reference](/docs/reference/overview)** tab: the **wiring layer** (CLI · MCP server · REST API), schemas, and auth.

***

**What you'll find here (this page):** a five-second orientation. Everything else lives under the tabs so we do not dump the whole machine on a cold reader.

† Vocabulary used across these docs (kernel · runtime · wiring · product surface · marketing surface · host environment) is **pending governing Chain DEC ratification** (see internal taxonomy work: DEC-833 draft, TEN-1695). This footnote comes off the Welcome page once that DEC and glossary amendments are committed.