Ex-manufacturing engineer ports Toyota Andon system to Claude Code, open-sources it
PrimeFold · reddit · 2026-09-08
A developer with 15 years in Lean/Six Sigma manufacturing open-sourced Andon (MIT, free), adapting Toyota production-line thinking to Claude Code so agents stop repeating the same mistakes.
Origin: an agent fixed a bug in 5 spots, claimed it was done, but 9 more instances lurked in files it never opened. The fix wasn't better prompts — it was changing the process, as manufacturing learned decades ago.
How it works:
- Every meaningful failure is logged, understood, and turned into a countermeasure that makes the error harder to repeat;
- The standout piece is a Stop hook: when the agent says "done/shipped/verified," the hook checks for fresh verification evidence; if absent, the session enters warn mode (promotable to blocking) instead of quietly ending;
- Rest is modular: a memory file, instructions with a mistakes log, hooks, and a setup for parallel agent sessions.
Deliberately boring infrastructure: Markdown, two Python hooks using only the standard library, no dependencies. The repo also includes a defect ledger inviting PRs in the format defect → root cause → countermeasure → result.
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