GBrain

Your AI agent is smart but forgetful. GBrain gives it a brain.

Built by the President and CEO of Y Combinator to run his actual AI agents. The production brain powering his OpenClaw and Hermes deployments: 17,888 pages, 4,383 people, 723 companies, 21 cron jobs running autonomously, built in 12 days. The agent ingests meetings, emails, tweets, voice calls, and original ideas while you sleep. It enriches every person and company it encounters. It fixes its own citations and consolidates memory overnight. You wake up and the brain is smarter than when you went to bed.

The brain wires itself. Every page write extracts entity references and creates typed links (attended, works_at, invested_in, founded, advises) with zero LLM calls. Hybrid search. Self-wiring knowledge graph. Structured timeline. Backlink-boosted ranking. Ask "who works at Acme AI?" or "what did Bob invest in this quarter?" and get answers vector search alone can't reach. Benchmarked side-by-side against the category: gbrain lands P@5 49.1%, R@5 97.9% on a 240-page Opus-generated rich-prose corpus, beating its own graph-disabled variant by +31.4 points P@5 and ripgrep-BM25 + vector-only RAG by a similar margin. The graph layer plus v0.12 extract quality together carry the gap. Full BrainBench scorecards + corpus live in the sibling gbrain-evals repo.

GBrain is those patterns, generalized. 34 skills. Install in 30 minutes. Your agent does the work. As Garry's personal agent gets smarter, so does yours.

New in v0.25.0 — BrainBench-Real (session capture, contributor opt-in): with GBRAIN_CONTRIBUTOR_MODE=1 set in your shell, every real query + search call through MCP, CLI, or the subagent tool-bridge gets captured (PII-scrubbed) into an eval_candidates table. Snapshot with gbrain eval export, replay against your code change with gbrain eval replay. Three numbers come back: mean Jaccard@k between captured and current retrieved slugs, top-1 stability, and latency Δ. Off by default for production users — no surprise data accumulation. Walkthrough: docs/eval-bench.md. NDJSON wire format: docs/eval-capture.md.

~30 minutes to a fully working brain. Database ready in 2 seconds (PGLite, no server). You just answer questions about API keys.

LLMs: fetch llms.txt for the documentation map, or llms-full.txt for the same map with core docs inlined in one fetch. Agents: start with AGENTS.md (or CLAUDE.md if you're Claude Code).

Install

On an agent platform (recommended)

GBrain is designed to be installed and operated by an AI agent. If you don't have one running yet:

• OpenClaw ... Deploy AlphaClaw on Render (one click, 8GB+ RAM)
• Hermes Agent ... Deploy on Railway (one click)

Paste this into your agent:

Retrieve and follow the instructions at:
https://raw.githubusercontent.com/garrytan/gbrain/master/INSTALL_FOR_AGENTS.md

That's it. The agent clones the repo, installs GBrain, sets up the brain, loads 34 skills, and configures recurring jobs. You answer a few questions about API keys. ~30 minutes.

If your agent doesn't auto-read AGENTS.md, point it at that file first: https://raw.githubusercontent.com/garrytan/gbrain/master/AGENTS.md is the non-Claude agent operating protocol (install, read order, trust boundary, common tasks). For the full doc map, use llms.txt at the same URL root.

Standalone CLI (no agent)

git clone https://github.com/garrytan/gbrain.git && cd gbrain && bun install && bun link
gbrain init                     # local brain, ready in 2 seconds
gbrain import ~/notes/          # index your markdown
gbrain query "what themes show up across my notes?"

Do NOT use bun install -g github:garrytan/gbrain. Bun blocks the top-level postinstall hook on global installs, so schema migrations never run and the CLI aborts with Aborted() the first time it opens PGLite. Use git clone + bun install && bun link as shown above. See #218.

3 results (hybrid search, 0.12s):

1. concepts/do-things-that-dont-scale (score: 0.94)
   PG's argument that unscalable effort teaches you what users want.
   [Source: paulgraham.com, 2013-07-01]

2. originals/founder-mode-observation (score: 0.87)
   Deep involvement isn't micromanagement if it expands the team's thinking.

3. concepts/build-something-people-want (score: 0.81)
   The YC motto. Connected to 12 other brain pages.

MCP server (Claude Code, Cursor, Windsurf)

GBrain exposes 30+ MCP tools via stdio:

{
  "mcpServers": {
    "gbrain": { "command": "gbrain", "args": ["serve"] }
  }
}

Add to ~/.claude/server.json (Claude Code), Settings > MCP Servers (Cursor), or your client's MCP config.

Remote MCP (Claude Desktop, Cowork, Perplexity)

gbrain auth create "claude-desktop"            # tokens via the existing CLI
gbrain serve --http --port 8787                 # built-in HTTP transport (Postgres-only)
ngrok http 8787 --url your-brain.ngrok.app      # any tunnel works
claude mcp add gbrain -t http https://your-brain.ngrok.app/mcp -H "Authorization: Bearer TOKEN"

Per-client guides: docs/mcp/. Hardening defaults, env vars, and threat model: SECURITY.md. ChatGPT requires OAuth 2.1 (not yet implemented).

Using gbrain with GStack

If your engineering agent runs on GStack, point it at gbrain for code lookup instead of grep+read. Cathedral II (v0.21.0) ships call-graph edges and two-pass retrieval — /investigate, /review, /plan-eng-review, and /office-hours all benefit when the agent walks the symbol graph instead of scanning files line by line.

The five magical-moment commands:

gbrain code-callers searchKeyword           # who calls this symbol?
gbrain code-callees searchKeyword           # what does this symbol call?
gbrain code-def BrainEngine                 # where is X defined?
gbrain code-refs BrainEngine                # all reference sites
gbrain query "how does N+1 handling work" --near-symbol BrainEngine.searchKeyword --walk-depth 2

All five auto-emit JSON on non-TTY (gh-CLI convention) so a GStack subagent shelling out via bash gets a clean parseable response. Run gbrain sources add <repo> --strategy code to index a repo, then your agent's brain-first lookup covers code, not just markdown. (Cathedral II release notes)

The 34 Skills

GBrain ships 34 skills organized by skills/RESOLVER.md (or your OpenClaw's AGENTS.md — both filenames are supported as of v0.19). The resolver tells your agent which skill to read for any task. v0.25.1 added 9 research-flavored skills (book-mirror flagship plus 8 pairings); see the new "Research and synthesis" section below.

Skill files are code. They're the most powerful way to get knowledge work done. A skill file is a fat markdown document that encodes an entire workflow: when to fire, what to check, how to chain with other skills, what quality bar to enforce. The agent reads the skill and executes it. Skills can also call deterministic TypeScript code bundled in GBrain (search, import, embed, sync) for the parts that shouldn't be left to LLM judgment. Thin harness, fat skills: the intelligence lives in the skills, not the runtime.

Always-on

Skill	What it does
signal-detector	Fires on every message. Spawns a cheap model in parallel to capture original thinking and entity mentions. The brain compounds on autopilot.
brain-ops	Brain-first lookup before any external API. The read-enrich-write loop that makes every response smarter.

Content ingestion

Skill	What it does
ingest	Thin router. Detects input type and delegates to the right ingestion skill.
idea-ingest	Links, articles, tweets become brain pages with analysis, author people pages, and cross-linking.
media-ingest	Video, audio, PDF, books, screenshots, GitHub repos. Transcripts, entity extraction, backlink propagation.
meeting-ingestion	Transcripts become brain pages. Every attendee gets enriched. Every company gets a timeline entry.
voice-note-ingest	Voice notes captured verbatim — exact phrasing preserved, never paraphrased. Routes to originals/concepts/people/companies/ideas/personal/voice-notes based on content.
article-enrichment	Raw article dumps become structured pages with executive summary, verbatim quotes, key insights, and why-it-matters.

Research and synthesis (v0.25.1)

Skill	What it does
book-mirror	Flagship. Hand the agent a book, get a personalized two-column chapter-by-chapter analysis. Left column preserves the chapter's actual content; right column maps every idea to your life using your words from the brain. ~$6 for a 20-chapter book at Opus. Pairs with gbrain book-mirror CLI for the trusted runtime.
strategic-reading	Read a book / article / case study through ONE specific problem-lens. Output: applied playbook with do / avoid / watch-for and short / medium / long-term recommendations.
concept-synthesis	Deduplicate thousands of concept stubs into a tiered intellectual map (T1 Canon to T4 Riff). Trace how ideas evolved across years of notes.
perplexity-research	Brain-augmented web research. Sends brain context to Perplexity so the search focuses on what's NEW vs already-known. Output: Executive Summary + Key New Developments + Confirming Signals + Contradictions or Updates + Recommended Brain Updates + Citations.
archive-crawler	Universal archivist for personal file archives (Dropbox / Backblaze / Gmail-takeout / hard-drive dumps). REFUSES to run unless archive-crawler.scan_paths: is set in gbrain.yml. Safe-by-default safety fence.
academic-verify	Trace a research claim through publication → methodology → raw data → independent replication. Routes through perplexity-research; produces a verdict (verified / partial / unverifiable / misattributed / retracted).
brain-pdf	Render any brain page to publication-quality PDF via the gstack make-pdf binary. Strips frontmatter, sanitizes emoji, applies running headers.

Brain operations

Skill	What it does
enrich	Tiered enrichment (Tier 1/2/3). Creates and updates person/company pages with compiled truth and timelines.
query	3-layer search with synthesis and citations. Says "the brain doesn't have info on X" instead of hallucinating.
maintain	Periodic health: stale pages, orphans, dead links, citation audit, back-link enforcement, tag consistency. v0.23 adds the dream cycle's synthesize + patterns phases ... overnight conversation transcripts become reflections, originals, and 25-year patterns.
citation-fixer	Scans pages for missing or malformed citations. Fixes format to match the standard.
repo-architecture	Where new brain files go. Decision protocol: primary subject determines directory, not format.
publish	Share brain pages as password-protected HTML. Zero LLM calls.
data-research	Structured data research with parameterized YAML recipes. Extract investor updates, expenses, company metrics from email.

Operational

Skill	What it does
daily-task-manager	Task lifecycle with priority levels (P0-P3). Stored as searchable brain pages.
daily-task-prep	Morning prep: calendar lookahead with brain context per attendee, open threads, task review.
cron-scheduler	Schedule staggering (5-min offsets), quiet hours (timezone-aware with wake-up override), idempotency.
reports	Timestamped reports with keyword routing. "What's the latest briefing?" finds it instantly.
cross-modal-review	Quality gate via second model. Refusal routing: if one model refuses, silently switch.
webhook-transforms	External events (SMS, meetings, social mentions) converted into brain pages with entity extraction.
testing	Validates every skill has SKILL.md with frontmatter, manifest coverage, resolver coverage.
skill-creator	Create new skills following the conformance standard. MECE check against existing skills.
skillify	The "skillify it!" meta-skill. Orchestrates the 10-step loop so failures become durable skills: scaffold the stubs via gbrain skillify scaffold, write the real logic, gate with gbrain skillify check + gbrain check-resolvable.
skillpack-check	Agent-readable gbrain health report. Exit code for CI; JSON for debugging. Cron-friendly.
smoke-test	8 post-restart health checks with auto-fix (Bun, CLI, DB, worker, Zod CJS, gateway, API key, brain repo). Drop-in user tests at ~/.gbrain/smoke-tests.d/*.sh.
minion-orchestrator	Background work in one skill. Shell jobs via gbrain jobs submit shell (operator/CLI, MCP blocks protected names) and LLM subagents via gbrain agent run. Parent-child DAGs, child_done inbox, durability across worker restarts.

Identity and setup

Skill	What it does
soul-audit	6-phase interview generating SOUL.md (agent identity), USER.md (user profile), ACCESS_POLICY.md (4-tier privacy), HEARTBEAT.md (operational cadence).
setup	Auto-provision PGLite or Supabase. First import. GStack detection.
migrate	Universal migration from Obsidian, Notion, Logseq, markdown, CSV, JSON, Roam.
briefing	Daily briefing with meeting context, active deals, and citation tracking.

Conventions

Cross-cutting rules in skills/conventions/:

• quality.md ... citations, back-links, notability gate, source attribution
• brain-first.md ... 5-step lookup before any external API call
• model-routing.md ... which model for which task
• test-before-bulk.md ... test 3-5 items before any batch operation
• cross-modal.yaml ... review pairs and refusal routing chain

How It Works

Signal arrives (meeting, email, tweet, link)
  -> Signal detector captures ideas + entities (parallel, never blocks)
  -> Brain-ops: check the brain first (gbrain search, gbrain get)
  -> Respond with full context
  -> Write: update brain pages with new information + citations
  -> Auto-link: typed relationships extracted on every write (zero LLM calls)
  -> Sync: gbrain indexes changes for next query

Every cycle adds knowledge. The agent enriches a person page after a meeting. Next time that person comes up, the agent already has context. The difference compounds daily.

The system gets smarter on its own. Entity enrichment auto-escalates: a person mentioned once gets a stub page (Tier 3). After 3 mentions across different sources, they get web + social enrichment (Tier 2). After a meeting or 8+ mentions, full pipeline (Tier 1). The brain learns who matters without being told. Deterministic classifiers improve over time via a fail-improve loop that logs every LLM fallback and generates better regex patterns from the failures. gbrain doctor shows the trajectory: "intent classifier: 87% deterministic, up from 40% in week 1."

"Prep me for my meeting with Jordan in 30 minutes" ... pulls dossier, shared history, recent activity, open threads

"What have I said about the relationship between shame and founder performance?" ... searches YOUR thinking, not the internet

Minions: your sub-agents won't drop work anymore

A durable, Postgres-native job queue built into the brain. Every long-running agent task is now a job that survives gateway restarts, streams progress, gets paused / resumed / steered mid-flight, and shows up in gbrain jobs list. Zero infra beyond your existing brain.

The production numbers that matter

Here's my personal OpenClaw deployment: one Render container. Supabase Postgres holding a 45,000-page brain. 19 cron jobs firing on schedule. Real gateway load from real daily work. The task: pull a month of my social posts from an external API and ingest them end-to-end into the brain as a structured page.

	Minions	sessions_spawn
Wall time	753ms	>10,000ms (gateway timeout)
Token cost	$0.00	~$0.03 per run
Success rate	100%	0% (couldn't even spawn)
Memory/job	~2 MB	~80 MB

Under that 19-cron load, sub-agent spawn couldn't clear the 10-second gateway wall. Minions landed it in under a second for zero tokens. Scaling: 19,240 posts across 36 months, single bash loop, ~15 min total, $0.00. Sub-agents: ~9 min best case, ~$1.08 in tokens, ~40% spawn failure. Lab: durability ∞ (SIGKILL mid-flight, 10/10 rescued), throughput ~10× faster, fan-out ~21× with no failure wall, memory ~400× less.

Full benchmarks live in gbrain-evals.

The routing rule

Deterministic (same input → same steps → same output) → Minions Judgment (input requires assessment or decision) → Sub-agents

Pull posts, parse JSON, write a brain page, run a sync — deterministic. $0 tokens, survives restart, millisecond runtime. Triage the inbox, assess meeting priority, decide if a cold email deserves a reply — judgment. What sub-agents are actually good at. minion_mode: pain_triggered (the default) automates the routing.

What's fixed

The six daily pains — spawn storms, agents that stop responding, forgotten dispatches, gateway crashes mid-run, runaway grandchildren, debugging soup — all belonged to the "deterministic work through a reasoning model" mistake. Minions fixes them by not making that mistake: max_children cap, timeout_ms + AbortSignal, child_done inbox, full parent_job_id/depth/transcript per job, Postgres durability with stall detection, cascade cancel via recursive CTE. Plus idempotency keys, attachment validation, removeOnComplete, and gbrain jobs smoke that proves the install in half a second.

gbrain jobs smoke                        # verify install
gbrain jobs submit sync --params '{}'    # fire a background job
gbrain jobs stats                        # health dashboard
gbrain jobs supervisor --concurrency 4   # canonical: auto-restarting worker (Postgres only)
gbrain jobs work --concurrency 4         # raw worker (no crash recovery — prefer `supervisor`)

gbrain jobs supervisor keeps the worker alive across crashes with exponential backoff, atomic PID locking, structured audit events at ~/.gbrain/audit/supervisor-*.jsonl, and a start --detach / status --json / stop subcommand surface for agents. In containers it runs as PID 1; on systemd hosts it's the child of gbrain-worker.service. Full deployment guide: docs/guides/minions-deployment.md.

Read skills/minion-orchestrator/SKILL.md for parent-child DAGs, fan-in collection, steering via inbox.

Minions is not incrementally better than sub-agents for background work. It's categorically different. 753ms vs gateway timeout. $0 vs tokens. 100% vs couldn't-spawn. If your agent does deterministic work on a schedule, it runs on Minions now.

Health check and self-heal

Minions is canonical as of v0.11.1 — every gbrain upgrade runs the migration automatically (schema → smoke → prefs → host rewrites → env-aware autopilot install). If you ever want to verify manually or wire a cron into your morning briefing:

gbrain doctor                    # half-migrated state? prints loud banner + exits non-zero
gbrain skillpack-check --quiet    # exit 0/1/2 for pipeline gating
gbrain skillpack-check | jq       # full JSON: {healthy, summary, actions[], doctor, migrations}

If anything's off, actions[] tells you the exact command to run. For deeper troubleshooting: docs/guides/minions-fix.md.

Moving gateway crons to Minions (deterministic scripts, zero LLM tokens per fire): docs/guides/minions-shell-jobs.md.

Durable agents: gbrain agent (v0.15)

Your subagent runs survive crashes now. OpenClaw died mid-run? The worker re-claims on restart and replays from the last committed turn. Fan-out across 50 shards, one shard crashes — the aggregator still claims after every child reaches a terminal state and writes a mixed-outcome summary. Tool calls persist as a two-phase ledger (pending → complete | failed) so replay is safe by construction, not by hope.

# Submit a single-subagent run
gbrain agent run "summarize my last 10 journal pages"

# Fan out N prompts across N subagent children + 1 aggregator
gbrain agent run "analyze every page" \
  --fanout-manifest manifests/pages.json \
  --subagent-def analyzer

# Tail a running job (heartbeat per turn + full transcript on completion)
gbrain agent logs 1247 --follow --since 5m

Durability is the point: every Anthropic turn commits to subagent_messages, every tool call to subagent_tool_executions. Worker kills, OpenClaw crashes, timeouts — all resumable. Host repos (your OpenClaw, etc.) ship their own subagent definitions via GBRAIN_PLUGIN_PATH + a gbrain.plugin.json manifest: see docs/guides/plugin-authors.md. Requires ANTHROPIC_API_KEY on the worker.

Skillify: say "skillify it!" and the bug becomes structurally impossible to repeat

Your OpenClaw hit a new failure. You fix it once in conversation. You say "skillify it!" And now the fix is permanent: a SKILL.md with triggers, a deterministic script with tests, a routing fixture the agent re-evaluates daily, a filing audit that keeps the output from drifting. Ten items. Every one required. The bug can't recur.

Hermes and similar agent frameworks auto-create skills as a background behavior. Fine until you don't know what the agent shipped. Checklists decay. Tests drift. Resolver entries get stale. Six months later it's an opaque pile nobody has read, nobody has tested, and nobody is sure still works. GBrain ships the same capability except the human stays in the loop and every step is a command you can run.

The four verbs you need (v0.19)

# 1. Scaffold all 5 stub files for a new skill in one shot.
gbrain skillify scaffold webhook-verify \
  --description "verify ngrok webhooks" \
  --triggers "verify the webhook,check tunnel" \
  --writes-pages --writes-to people/,companies/

# 2. Replace the SKILLIFY_STUB sentinels with real logic + real tests.
$EDITOR skills/webhook-verify/scripts/webhook-verify.mjs
$EDITOR test/webhook-verify.test.ts

# 3. Run the 10-item audit: SKILL.md exists, script exists, unit + E2E tests,
#    LLM evals, resolver entry, trigger eval, check-resolvable gate, brain filing.
gbrain skillify check skills/webhook-verify/scripts/webhook-verify.mjs

# 4. Verify the whole tree: reachability, MECE overlap, DRY, routing gaps,
#    filing audit, SKILLIFY_STUB sentinels (fails if any skill still has one).
gbrain check-resolvable              # warnings advisory, errors block
gbrain check-resolvable --strict     # warnings block too (CI opt-in)

Idempotent re-runs. --force regenerates stub files but NEVER duplicates a resolver row. Scaffold completes in under 2 seconds. The real work (your rule, your script, your tests) is what you spend time on. Everything else is boilerplate the CLI writes for you.

gbrain routing-eval — catch the routing gaps your users actually hit

Drop a routing-eval.jsonl fixture next to any skill. Each line is {intent, expected_skill, ambiguous_with?}. gbrain check-resolvable runs the structural layer by default; gbrain routing-eval runs the same structural layer as a dedicated CI verb. The --llm flag is accepted as a placeholder for a future LLM tie-break layer; in this release it emits a stderr notice and runs structural only. False positives (wrong skill matched), missed routes (no skill matched), and tautological fixtures (intent copies trigger verbatim) all surface as specific advisories with the exact file:line to fix.

Works on your OpenClaw, not just gbrain's repo

v0.19 teaches gbrain check-resolvable to accept AGENTS.md as a resolver file alongside RESOLVER.md, at either the skills directory OR one level up (OpenClaw-native workspace-root layout). The skill manifest auto-derives from walking skills/*/SKILL.md when manifest.json is missing. Set OPENCLAW_WORKSPACE=~/your-openclaw/workspace and everything just works:

export OPENCLAW_WORKSPACE=~/your-openclaw/workspace
gbrain check-resolvable --verbose
# Auto-detects: AGENTS.md at workspace root, 107 skills derived from SKILL.md walk,
# 15 unreachable errors surfaced, 108 advisory warnings for overlaps and gaps.

First run on a real OpenClaw deployment found 15 unreachable skills out of 102 — about 15% of the tree was dark. The essay's "skills the agent can never reach" footgun, now visible.

gbrain skillpack install — drop 25 curated skills into your OpenClaw

The skills gbrain ships are a curated bundle. Install them into your workspace with dependency closure (shared conventions come along), per-file diff protection (your local edits are never clobbered without --overwrite-local), a file lock that serializes concurrent installers, and an atomic managed-block update to your AGENTS.md so you can see exactly what gbrain wrote.

gbrain skillpack list                          # 25 curated skills
gbrain skillpack install brain-ops             # one skill + its shared conventions
gbrain skillpack install --all                 # the full bundle
gbrain skillpack install brain-ops --dry-run   # preview; no writes
gbrain skillpack diff brain-ops                # compare bundle vs your local copy

Re-running is safe. The managed-block markers in your AGENTS.md let skillpack install accumulate rows across separate single-skill installs instead of overwriting each other. A receipt comment inside the fence (<!-- gbrain:skillpack:manifest cumulative-slugs="..." -->) tracks what gbrain has installed across runs. install --all is the only path that prunes; per-skill install never deletes what it didn't install. If you hand-add a row inside the fence, gbrain preserves it on reinstall and emits a stderr notice telling your agent to investigate.

Skillify is the piece that makes the skills tree survive six months of compounding work. Read skills/skillify/SKILL.md for the full 10-item checklist and the anti-patterns it catches.

Storage tiering: keep bulk content out of git (v0.22.11)

When your brain crosses 100K files and bulk machine-generated content (tweets, articles, transcripts) becomes the size driver, declare which directories belong in git and which live in the database only.

# gbrain.yml at the brain repo root
storage:
  db_tracked:
    - people/
    - companies/
    - deals/
  db_only:
    - media/x/
    - media/articles/
    - meetings/transcripts/

gbrain sync auto-manages your .gitignore for db_only paths. gbrain export --restore-only --repo . repopulates missing files from the database (container restart, fresh clone, accidental rm). gbrain storage status shows the tier breakdown.

Full guide: docs/storage-tiering.md.

Getting Data In

GBrain ships integration recipes that your agent sets up for you. Each recipe tells the agent what credentials to ask for, how to validate, and what cron to register.

Recipe	Requires	What It Does
Public Tunnel	—	Fixed URL for MCP + voice (ngrok Hobby $8/mo)
Credential Gateway	—	Gmail + Calendar access
Voice-to-Brain	ngrok-tunnel	Phone calls to brain pages (Twilio + OpenAI Realtime)
Email-to-Brain	credential-gateway	Gmail to entity pages
X-to-Brain	—	Twitter timeline + mentions + deletions
Calendar-to-Brain	credential-gateway	Google Calendar to searchable daily pages
Meeting Sync	—	Circleback transcripts to brain pages with attendees

Data research recipes extract structured data from email into tracked brain pages. Built-in recipes for investor updates (MRR, ARR, runway, headcount), expense tracking, and company metrics. Create your own with gbrain research init.

Run gbrain integrations to see status.

GBrain + GStack

GStack is the engine. GBrain is the mod.

• GStack = coding skills (ship, review, QA, investigate, office-hours, retro). 70,000+ stars, 30,000 developers per day. When your agent codes on itself, it uses GStack.
• GBrain = everything-else skills (brain ops, signal detection, ingestion, enrichment, cron, reports, identity). When your agent remembers, thinks, and operates, it uses GBrain.
• hosts/gbrain.ts = the bridge. Tells GStack's coding skills to check the brain before coding.

gbrain init detects if GStack is installed and reports mod status. If GStack isn't there, it tells you how to get it.

Architecture

┌──────────────────┐    ┌───────────────┐    ┌──────────────────┐
│   Brain Repo     │    │    GBrain     │    │    AI Agent      │
│   (git)          │    │  (retrieval)  │    │  (read/write)    │
│                  │    │               │    │                  │
│  markdown files  │───>│  Postgres +   │<──>│  29 skills       │
│  = source of     │    │  pgvector     │    │  define HOW to   │
│    truth         │    │               │    │  use the brain   │
│                  │<───│  hybrid       │    │                  │
│  human can       │    │  search       │    │  RESOLVER.md     │
│  always read     │    │  (vector +    │    │  routes intent   │
│  & edit          │    │   keyword +   │    │  to skill        │
│                  │    │   RRF)        │    │                  │
└──────────────────┘    └───────────────┘    └──────────────────┘

The repo is the system of record. GBrain is the retrieval layer. The agent reads and writes through both. Human always wins... edit any markdown file and gbrain sync picks up the changes.

The Knowledge Model

Every page follows the compiled truth + timeline pattern:

---
type: concept
title: Do Things That Don't Scale
tags: [startups, growth, pg-essay]
---

Paul Graham's argument that startups should do unscalable things early on.
The key insight: the unscalable effort teaches you what users actually
want, which you can't learn any other way.

---

- 2013-07-01: Published on paulgraham.com
- 2024-11-15: Referenced in batch W25 kickoff talk

Above the ---: compiled truth. Your current best understanding. Gets rewritten when new evidence changes the picture. Below: timeline. Append-only evidence trail. Never edited, only added to.

Knowledge Graph

Pages aren't just text. Every mention of a person, company, or concept becomes a typed link in a structured graph. The brain wires itself.

Write a meeting page mentioning Alice and Acme AI
  -> Auto-link extracts entity refs from content (zero LLM calls)
  -> Infers types: meeting page + person ref => `attended`
                   "CEO of X" pattern        => `works_at`
                   "invested in"             => `invested_in`
                   "advises", "advisor"      => `advises`
                   "founded", "co-founded"   => `founded`
  -> Reconciles stale links: edits remove links no longer in content
  -> Backlinks rank well-connected entities higher in search

gbrain graph-query people/alice --type attended --depth 2
# returns who Alice met with, transitively

The graph powers questions vector search can't: "who works at Acme AI?", "what has Bob invested in?", "find the connection between Alice and Carol". Backfill an existing brain in one command:

gbrain extract links --source db        # wire up the existing 29K pages
gbrain extract timeline --source db     # extract dated events from markdown timelines

Then ask graph questions or watch the search ranking improve. Benchmarked side-by-side against ripgrep-BM25, vector-only RAG (same embedder), and gbrain-with-graph-disabled: gbrain lands P@5 49.1%, R@5 97.9% on a 240-page Opus-generated rich-prose corpus, beating hybrid-nograph by +31.4 points P@5. Isolate the contribution: v0.11→v0.12 moved the same gbrain codebase from P@5 22.1% → 49.1% on identical inputs, so typed-link extract quality is load-bearing. Full scorecards + reproducible corpus: gbrain-evals.

Search

Hybrid search: vector + keyword + RRF fusion + multi-query expansion + 4-layer dedup.

Query
  -> Intent classifier (entity? temporal? event? general?)
  -> Multi-query expansion (Claude Haiku)
  -> Vector search (HNSW cosine) + Keyword search (tsvector)
  -> RRF fusion: score = sum(1/(60 + rank))
  -> Cosine re-scoring + compiled truth boost
  -> 4-layer dedup + compiled truth guarantee
  -> Results

Keyword alone misses conceptual matches. Vector alone misses exact phrases. RRF gets both. Search quality is benchmarked and reproducible: gbrain eval --qrels queries.json measures P@k, Recall@k, MRR, and nDCG@k. A/B test config changes before deploying them.

Why it works: many strategies in concert

The brain isn't one trick. Every retrieval question goes through ~20 deterministic techniques layered together. No single one is magic; the win comes from stacking them so each layer covers what the others miss.

Question
  │
  ├─ INGESTION (every put_page)
  │    ├─ Recursive markdown chunking (or semantic / LLM-guided)
  │    ├─ Embedding cache invalidation on edit
  │    └─ Idempotent imports (content-hash dedup)
  │
  ├─ GRAPH EXTRACTION (auto-link post-hook, zero LLM)
  │    ├─ Entity-ref regex (markdown links + bare slugs)
  │    ├─ Code-fence stripping (no false-positive slugs in code blocks)
  │    ├─ Typed inference cascade (FOUNDED → INVESTED → ADVISES → WORKS_AT)
  │    ├─ Page-role priors (partner-bio language → invested_in)
  │    ├─ Within-page dedup (same target collapses to one link)
  │    ├─ Stale-link reconciliation (edits remove dropped refs)
  │    └─ Multi-type link constraint (same person can works_at AND advises)
  │
  ├─ SEARCH PIPELINE (every query)
  │    ├─ Intent classifier (entity / temporal / event / general — auto-routes)
  │    ├─ Multi-query expansion (Haiku rephrases the question 3 ways)
  │    ├─ Vector search (HNSW cosine over OpenAI embeddings)
  │    ├─ Keyword search (Postgres tsvector + websearch_to_tsquery)
  │    ├─ Source-aware ranking (curated dirs outrank chat/daily swamp at SQL layer)
  │    ├─ Hard-exclude (test/ archive/ attachments/ .raw/ filtered before retrieval)
  │    ├─ Reciprocal Rank Fusion (score = sum 1/(60+rank) across both)
  │    ├─ Cosine re-scoring (re-rank chunks against actual query embedding)
  │    ├─ Compiled-truth boost (assessments outrank timeline noise)
  │    ├─ Backlink boost (well-connected entities rank higher)
  │    └─ Source-aware dedup (one CT chunk per page guaranteed)
  │
  ├─ GRAPH TRAVERSAL (relational queries)
  │    ├─ Recursive CTE with cycle prevention (visited-array check)
  │    ├─ Type-filtered edges (--type works_at, attended, etc.)
  │    ├─ Direction control (in / out / both)
  │    └─ Depth-capped (≤10 for remote MCP; DoS prevention)
  │
  └─ AGENT WORKFLOW (graph-confident hybrid)
       ├─ Graph-query first (high-precision typed answers)
       ├─ Grep fallback when graph returns nothing
       └─ Graph hits ranked first in top-K (better P@K and R@K)

End-to-end on the BrainBench v1 corpus (240 rich-prose pages, before/after PR #188):

Metric	BEFORE PR #188	AFTER PR #188	Δ
Precision@5	39.2%	44.7%	+5.4 pts
Recall@5	83.1%	94.6%	+11.5 pts
Correct in top-5	217	247	+30
Graph-only F1 (ablation)	57.8% (grep)	86.6%	+28.8 pts

Plus 5 orthogonal capability checks (identity resolution, temporal queries, performance at 10K-page scale, robustness to malformed input, MCP operation contract). All pass. Full report: gbrain-evals.

The point: each technique handles a class of inputs the others miss. Vector search misses exact slug refs; keyword catches them. Keyword misses conceptual matches; vector catches them. RRF picks the best of both. Compiled-truth boost keeps assessments above timeline noise. Auto-link extraction wires the graph that lets backlink boost rank well-connected entities higher. Graph traversal answers questions search alone can't reach. The agent picks graph-first for precision and falls back to keyword for recall. All deterministic, all in concert, all measured.

Voice

Call a phone number. Your AI answers. It knows who's calling, pulls their full context from the brain, and responds like someone who actually knows your world. When the call ends, a brain page appears with the transcript, entity detection, and cross-references.

See it in action

The voice recipe ships with GBrain: Voice-to-Brain. WebRTC works in a browser tab with zero setup. A real phone number is optional.

Engine Architecture

CLI / MCP Server
     (thin wrappers, identical operations)
              |
      BrainEngine interface (pluggable)
              |
     +--------+--------+
     |                  |
PGLiteEngine       PostgresEngine
  (default)          (Supabase)
     |                  |
~/.gbrain/           Supabase Pro ($25/mo)
brain.pglite         Postgres + pgvector
embedded PG 17.5

     gbrain migrate --to supabase|pglite
         (bidirectional migration)

PGLite: embedded Postgres, no server, zero config. When your brain outgrows local (1000+ files, multi-device), gbrain migrate --to supabase moves everything.

File Storage

Brain repos accumulate binaries. GBrain has a three-stage migration:

gbrain files mirror <dir>       # copy to cloud, local untouched
gbrain files redirect <dir>     # replace local with .redirect pointers
gbrain files clean <dir>        # remove pointers, cloud only
gbrain files restore <dir>      # download everything back (undo)

Storage backends: S3-compatible (AWS, R2, MinIO), Supabase Storage, or local.

Commands

SETUP
  gbrain init [--supabase|--url]        Create brain (PGLite default)
  gbrain migrate --to supabase|pglite   Bidirectional engine migration
  gbrain upgrade                        Self-update with feature discovery

PAGES
  gbrain get <slug>                     Read a page (fuzzy slug matching)
  gbrain put <slug> [< file.md]         Write/update (auto-versions)
  gbrain delete <slug>                  Delete a page
  gbrain list [--type T] [--tag T]      List with filters

SEARCH
  gbrain search <query>                 Keyword search (tsvector)
  gbrain query <question>              Hybrid search (vector + keyword + RRF)

IMPORT
  gbrain import <dir> [--no-embed] [--workers N]
                                        Import markdown (idempotent)
  gbrain sync [--repo <path>] [--workers N]
                                        Git-to-brain incremental sync
                                        (>100-file diffs auto-parallelize 4 workers on Postgres)
  gbrain export [--dir ./out/]          Export to markdown

FILES
  gbrain files list|upload|sync|verify  File storage operations

EMBEDDINGS
  gbrain embed [<slug>|--all|--stale]   Generate/refresh embeddings

LINKS + GRAPH
  gbrain link|unlink|backlinks          Cross-reference management
  gbrain extract links|timeline|all     Batch backfill from existing pages
                                        (--source db|fs, --type, --since, --dry-run)
  gbrain graph-query <slug>             Typed traversal (--type T --depth N
                                        --direction in|out|both)

JOBS (Minions)
  gbrain jobs submit <name> [--params JSON] [--follow]  Submit a background job
  gbrain jobs list [--status S] [--queue Q]             List jobs with filters
  gbrain jobs get|cancel|retry|delete <id>              Manage job lifecycle
  gbrain jobs prune [--older-than 30d]                  Clean completed/dead jobs
  gbrain jobs stats                                     Job health dashboard
  gbrain jobs smoke                                     One-command health check
  gbrain jobs work [--queue Q] [--concurrency N]        Start worker daemon

SKILLS (v0.19)
  gbrain skillify scaffold <name>       Create 5 stub files + idempotent resolver row
  gbrain skillify check [path]          10-item audit of a skill
  gbrain skillpack list                 Print the 25 curated skills in the bundle
  gbrain skillpack install <name>       Copy one skill + its shared conventions into target
  gbrain skillpack install --all        Install the full curated bundle
  gbrain skillpack diff <name>          Per-file diff: bundle vs target workspace
  gbrain check-resolvable [--strict]    Resolver audit (reachability, MECE, DRY, routing, filing,
                                        SKILLIFY_STUB). Accepts RESOLVER.md OR AGENTS.md.
  gbrain routing-eval [--llm] [--json]  Intent→skill routing accuracy on fixtures

ADMIN
  gbrain doctor [--json] [--fast]       Health checks (resolver, skills, DB, embeddings)
  gbrain doctor --fix [--dry-run]       Auto-fix DRY violations (delegate inlined rules to conventions)
  gbrain doctor --locks                 List idle-in-tx backends (57014 diagnostic, Postgres only)
  gbrain stats                          Brain statistics
  gbrain serve                          MCP server (stdio)
  gbrain serve --http --port 8787       MCP server (HTTP, Postgres-only, bearer auth)
  gbrain auth create|list|revoke|test   Token management for the HTTP transport
  gbrain integrations                   Integration recipe dashboard
  gbrain sources list|add|remove|...    Multi-source brain management (v0.18)
  gbrain dream [--dry-run] [--phase N]  8-phase maintenance cycle (lint→backlinks→sync→synthesize
                                        →extract→patterns→embed→orphans). v0.23 added synthesize +
                                        patterns: transcripts → reflections + cross-session themes.
  gbrain dream --input <file>           Ad-hoc transcript synthesis (implies --phase synthesize)
  gbrain dream --date YYYY-MM-DD        Synthesize a single day; --from/--to for backfill ranges
  gbrain check-backlinks check|fix      Back-link enforcement
  gbrain lint [--fix]                   LLM artifact detection
  gbrain repair-jsonb [--dry-run]       Repair v0.12.0 double-encoded JSONB (Postgres)
  gbrain orphans [--json] [--count]     Find pages with zero inbound wikilinks
  gbrain transcribe <audio>             Transcribe audio (Groq Whisper)
  gbrain research init <name>           Scaffold a data-research recipe
  gbrain research list                  Show available recipes

Run gbrain --help for the full reference.

Origin Story

I was setting up my OpenClaw agent and started a markdown brain repo. One page per person, one page per company, compiled truth on top, timeline on the bottom. Within a week: 10,000+ files, 3,000+ people, 13 years of calendar data, 280+ meeting transcripts, 300+ captured ideas.

The agent runs while I sleep. The dream cycle scans every conversation, enriches missing entities, fixes broken citations, consolidates memory. I wake up and the brain is smarter than when I went to sleep.

The skills in this repo are those patterns, generalized. What took 11 days to build by hand ships as a mod you install in 30 minutes.

Docs

For agents:

• skills/RESOLVER.md ... Start here. The skill dispatcher.
• Individual skill files ... 28 standalone instruction sets (25 ship in the curated gbrain skillpack install bundle)
• GBRAIN_SKILLPACK.md ... Legacy reference architecture
• Getting Data In ... Integration recipes and data flow
• GBRAIN_VERIFY.md ... Installation verification

For humans:

• GBRAIN_RECOMMENDED_SCHEMA.md ... Brain repo directory structure
• Thin Harness, Fat Skills ... Architecture philosophy
• ENGINES.md ... Pluggable engine interface

Reference:

• GBRAIN_V0.md ... Full product spec
• CHANGELOG.md ... Version history

Benchmarks:

• gbrain-evals ... BrainBench, the sibling repo that holds the eval harness, corpus, scorecards, and 4-adapter comparisons. Depends on gbrain; not installed alongside gbrain.

Contributing

See CONTRIBUTING.md. Run bun test for unit tests. For the full local CI gate (gitleaks + unit + all 29 E2E files in Docker, the same checks GH Actions runs), use bun run ci:local ... or bun run ci:local:diff for the diff-aware subset during fast iteration.

If you're working on retrieval or any of the search/embedding/ranking surface, set GBRAIN_CONTRIBUTOR_MODE=1 in your shell rc and use gbrain eval replay to gate your changes against a snapshot of real captured queries — the dev loop is documented in docs/eval-bench.md. Capture is off by default for production users (no surprise data accumulation); the env var is the contributor opt-in.

PRs welcome for: new enrichment APIs, performance optimizations, additional engine backends, new skills following the conformance standard in skills/skill-creator/SKILL.md.

License

MIT