brain0 — the black box for AI-written code

git tells you what changed. brain0 tells you why — which prompt wrote it, what the agent read to write it, and whether you can trust it.

npx brain0 up

One command, any repo: brain0 passively indexes your git history (the facts) and your coding-agent sessions (the intents — Codex and Claude Code auto-discovered), then opens an explorable decision graph at http://localhost:8787. Clicking a commit reveals the prompts behind it, per-file diffs, what the agents read, and risk at a glance.

• Drift — the agent said "I only touched the parser". brain0 fact-checks it against git.
• DLP reads — which files (and which secrets) reached the model's context.
• Risk that learns — evidence-driven scoring; "looked safe, proved dangerous" gets flagged.
• MCP why-layer — claude mcp add brain0 -- brain0 mcp gives your agent long-term memory of why the code is the way it is.
• Offline by default — no hooks, no signup, no telemetry, zero egress without keys.

Daily loop:

brain0 today             # morning triage: what agents did, riskiest first
brain0 report            # the accountability report (add --md to share it)
brain0 rewind            # the agent wrecked your tree? restore any checkpoint

Requirements: Node ≥ 20. Local models via Ollama are optional and make summaries/search better — never required.

Full documentation, GUI guide, configuration and troubleshooting: https://github.com/Brain0-ai/brain0

Apache-2.0 · © The brain0 Authors