Giving Claude Code a fast-and-slow brain with Jev
An open-source setup treats Jev as the fast gut brain that makes simple calls in milliseconds while Claude handles only hard problems, with install commands and a measured ~30% cost reduction.
I couldn't f*cking believe this someone gave Claude Code a human brain setup, and it's all open source. JEV is the fast gut brain. it scans everything in milliseconds and makes the easy calls. Claude is the slow thinking brain. it only wakes up for the hard ones. here are the commands that wire the two together: /plugin marketplace add rashedInt32/jev-mcp /plugin install jev@jev-mcp -> Claude gets Jev as tools: classify, score, check npm install -g @dzhng/jevgrep jg "how are payments retried?" ./my-project -> ask what the code does, get the right files back. the author measured ~30% lower cost on the same tasks npx skills add altryne/jevify --skill jevify -> teaches your agent to hand the bulk yes/no work to Jev by itself > and fast-jev-compaction swaps Claude Code's summary for Jev decisions: it drops stale tool calls and keeps everything else word for word. faster runs, smaller bills, almost no compute wasted. save this before your next session.
This post quotes another post: x.com/hanakoxbt/status/2101709924828934222