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Install

Three install paths. Pick one. Mix later if needed.

1. Run with an agent platform (recommended)

Already running OpenClaw or Hermes?

bun install -g github:garrytan/gbrain
gbrain init --pglite                  # 2 seconds; no server
gbrain skillpack scaffold --all       # 43 skills scaffolded into your agent workspace
gbrain doctor                         # green checks all the way down

Your agent now reads skills/RESOLVER.md once per request, routes intent to the right skill, executes. New entity mentions create new pages. Daily cron runs enrichment overnight.

Scaffolded skills are first-class files in your agent repo — edit freely. To pull upstream gbrain improvements later, gbrain skillpack reference <name> diffs your local copy vs the bundle. The legacy skillpack install managed-block model was retired in v0.36.0.0; if you're upgrading from an older release, run gbrain skillpack migrate-fence once to strip the legacy fence and keep your existing skill rows.

To upgrade later: gbrain upgrade runs schema migrations + post-upgrade prompts (chunker bumps, the v0.36.2.0 ZeroEntropy switch). Always TTY-only; non-TTY upgrades skip prompts with informational stderr lines.

2. CLI standalone

No agent platform, just shell + MCP-aware editor.

bun install -g github:garrytan/gbrain
gbrain init --pglite

If bun install -g hits a postinstall error (Bun blocks postinstall hooks in some environments), the CLI prints a recovery hint pointing at #218. Run gbrain doctor to diagnose, then gbrain apply-migrations --yes manually. The deterministic fallback is git clone https://github.com/garrytan/gbrain.git ~/gbrain && cd ~/gbrain && bun install && bun link.

The init flow detects your repo size and suggests Supabase for brains > 1000 markdown files. To switch later:

gbrain migrate --to supabase     # PGLite → Postgres
gbrain migrate --to pglite       # Postgres → PGLite (rare)

API keys live in ~/.gbrain/config.json (file plane) or env vars (OPENAI_API_KEY, ZEROENTROPY_API_KEY, VOYAGE_API_KEY, ANTHROPIC_API_KEY). Set via CLI:

gbrain config set zeroentropy_api_key sk-...
gbrain config set anthropic_api_key sk-ant-...

Common follow-ups:

gbrain import ~/my-knowledge      # bulk-import a markdown folder
gbrain sync --watch               # live-sync a git repo (autopilot mode)
gbrain autopilot --install        # background daemon for nightly enrichment

3. MCP server (any MCP client)

gbrain serve                      # stdio MCP (Claude Desktop / Code / Cursor)
gbrain serve --http               # HTTP MCP with OAuth 2.1 + admin dashboard

Per-client setup guides live in docs/mcp/:

The HTTP server ships with an admin SPA at /admin, an SSE activity feed at /admin/events, DCR-style client registration, scope-gated read/write/admin access, and rate limiting.

Thin-client mode

Connect to someone else's brain without running a local engine:

gbrain init --mcp-only            # configures remote MCP, skips local DB

Useful for: team mounts, brain-as-a-service deployments, dev machines without disk space. Most local commands refuse with a paste-ready hint. See docs/architecture/topologies.md.

Verifying the install

gbrain doctor --json              # full health check
gbrain models                     # which AI models are configured for what
gbrain models doctor              # 1-token probe per configured model

If anything's yellow, gbrain doctor names the fix command in the message. Most issues are missing API keys or stale schema (gbrain upgrade --force-schema).