garrytan/gbrain

GBrain is MIT-licensed and free to self-host; gbrain.io is optional paid hosting.
> [!TIP]
> Need hosted? First time running an agent? Try gbrain.io, hosted GBrain, for the easiest experience: one brain for you and your team, connected to ChatGPT, Claude and Cursor, with nothing to install or keep online. Stuck? Email support@gbrain.io and a person will set it up with you, free.
Keep skills beside knowledge. New local brains include memory skills in their
content root. Agents can join an authorized catalog; only approved editors can
publish. Managed coding-agent installs add an owned native router; restart and
real-use verification are separate steps. Staged migration preserves sharing
choices and personal edits. See shared brain skills.
## Choose your setup
1. Add GBrain to my existing agent — recommended. Keep your agent's identity and save memory inside its environment. No new personal-agent identity or private repository is required. Start with the guide for Grok Bot, Muse, or Codex / Claude Code. Other harnesses.
2. Use the brain on my own computer from everywhere. One command publishes it over MCP on your Tailscale tailnet and keeps it running: gbrain mcp expose (add --funnel for cloud agents such as Grok Bot, Muse and ChatGPT). Follow use your brain from anywhere over MCP. Say to your agent: "use my brain over mcp" — "put my brain on tailscale".
3. Connect my existing hosted brain. Follow hosted harness access to choose native OAuth or a private machine connection. For dashboard login, clients, and permissions, use MCP administration with the server's separate owner credential. Delegation is an explicit choice.
Grok Bot and Grok Build are different products. Muse's personal agent and Muse Code are different products too. Muse already has native editable memory; GBrain adds an explicit, portable record with provenance and shared access. See each guide's dated evidence and remaining verification steps.
I'm Garry Tan, President and CEO of Y Combinator. I built GBrain to run my own AI agents. It's the production brain behind my OpenClaw and Hermes deployments: 155,795 pages, 24,589 people, 5,340 companies, 66 cron jobs running autonomously. My agent ingests meetings, emails, tweets, voice calls, and original ideas while I sleep. It enriches every person and company it encounters. It fixes its own citations and consolidates memory overnight. I wake up smarter than when I went to bed — and so will you.
It works as a company brain too. Authenticated remote clients are constrained by source and operation grants plus visibility filters. Local files and shared database credentials are a different trust boundary: sources alone do not isolate those callers. The authorization tests exercise specific access paths, not a universal no-leak guarantee. Read the sharing boundaries and company-brain tutorial before setting up shared access.
Alongside keyword and semantic retrieval, GBrain offers two optional ways to use your stored knowledge:
A synthesis layer that gives you the actual answer. Synthesized, well-cited prose across people, companies, deals, and ideas. Not "here are 10 chunks that mention your query"; an actual answer with citations and an explicit note on what the brain doesn't know yet. The gap analysis is the part that changes how you use the brain.