# Use Brian

> A shared brain for small teams: an assistant that remembers your customers, deals, and docs, runs scheduled work and workflows, and is reachable from web, Telegram, Slack, a public API, and MCP.

If you are an AI agent, prefer the agent-readable markdown mirror of these docs: https://github.com/use-brian/agent-docs (kb-style markdown, same facts as usebrian.ai/docs, optimized for machine reading).

## Category guides

- [What is an AI company brain?](https://usebrian.ai/ai-company-brain): definition of the category, what a company brain replaces, and how its memory compounds
- [What is an AI operating system?](https://usebrian.ai/ai-operating-system): the layer that owns memory, scheduling, permissions, and tool access for a company's AI work
- [Changelog](https://usebrian.ai/changelog): what shipped, newest first

## Docs

- [Overview](https://usebrian.ai/docs): what Use Brian is and how the docs are organized
- [Quickstart](https://usebrian.ai/docs/quickstart): sign in to first conversation in five minutes
- [Assistants](https://usebrian.ai/docs/assistants): the unit of identity; memory scope, channels, tools
- [Memory & knowledge](https://usebrian.ai/docs/memory): auto-extracted memory vs the curated knowledge base
- [Brain](https://usebrian.ai/docs/brain): entities, edges, episodes; how signals become structure
- [Tasks](https://usebrian.ai/docs/tasks): durable commitments the assistant tracks
- [CRM](https://usebrian.ai/docs/crm): contacts, companies, deals as first-party brain rows
- [Workspaces & sharing](https://usebrian.ai/docs/workspaces): membership, roles, inter-assistant sharing
- [Channels](https://usebrian.ai/docs/channels): web, Telegram, Slack; bring-your-own bots
- [Tools & scheduled tasks](https://usebrian.ai/docs/tools): connectors (MCP), per-tool policy, cron jobs
- [Workflows](https://usebrian.ai/docs/workflows): step types, triggers, approvals, cost
- [Doc](https://usebrian.ai/docs/doc): the page surface chat assembles over your data
- [Custom apps](https://usebrian.ai/docs/apps): build a static web app that renders inside a workspace and reads its brain through a scoped bridge

## API

- [Public API overview](https://usebrian.ai/docs/api): embed an assistant server-to-server
- [Authentication](https://usebrian.ai/docs/api/authentication): sk_live keys, lifecycle, rotation
- [Send messages](https://usebrian.ai/docs/api/messages): POST /api/v1/assistants/{id}/messages, errors, examples
- [Identity & memory](https://usebrian.ai/docs/api/identity): anonymous vs identified end users
- [Connector identity](https://usebrian.ai/docs/api/connector-identity): trusted X-Sidanclaw-* headers for your MCP server
- [MCP server](https://usebrian.ai/docs/api/brain-mcp): plug any MCP client into the workspace brain (sk_brain keys / OAuth)

## Trust

- [Pricing](https://usebrian.ai/docs/pricing): plans, credits, tier menu, extra usage
- [Privacy](https://usebrian.ai/docs/privacy): what is stored, retention, third parties
- [FAQ](https://usebrian.ai/docs/faq): common questions
- [Open source & self-hosting](https://usebrian.ai/docs/open-source): AGPLv3 core, three-command local install

## Optional

- [Agent docs (markdown mirror)](https://github.com/use-brian/agent-docs): kb-style docs written for AI agents
- [Source code](https://github.com/use-brian/use-brian): the open core (AGPLv3)