Open-source second brain repo bundles Jev engineering and loop engineering learning tracks
The author packaged his viral second brain system into an MIT-licensed repo with 18 agent skills, 72 slash commands, and five learning tracks including Jev engineering and loop engineering.
this is free f*cking gold if youre building a second brain his second brain article hit 8 million views, so he packaged the entire system into one repo the guide, the tools and the learning path all come with it • the guide > 10 sections, 65 pages, from the core idea to troubleshooting > 5 additional tracks, 44 pages, including 15 pages of build guides with working code • the machine (.claude/) > 18 agent skills, one for each workflow > 72 slash commands - /ingest-pdf, /ingest-youtube, /ingest-voice, /backfill > 6 subagents - curator, linker, researcher, reviewer, ingestor, graph-analyst > 4 are read-only, so those agents can't rewrite your vault • the scripts (plain Python, zero dependencies) > graph export, link checker, vault stats, chat converter, site builder • the starter vault > its own CLAUDE.md with page contracts and linking rules > raw/ preserves the original inputs; wiki/ is maintained by the agent > log.md - one entry per run to keep changes traceable • 87 vetted resources > 28 tools, 26 Obsidian plugins, 15 repos, 12 skills, plus papers and articles five tracks to choose from: > knowledge graphs > Jev engineering > agent harnesses > loop engineering > eval engineering start with the second brain guide if you're new to this. jump straight to the tracks if you've already built your setup the Jev engineering and loop engineering tracks alone are worth cloning the repo for a consultant can charge four figures for a research system like this. this one is public and MIT-licensed ↳ http://github.com/undefined-ui/second-brain-os
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