LangChain Multi-Env Setup (Python) Overview A team ships a LangChain 1.0 service to staging with loading into . Security audits — prints in plain text. Anyone with , any sidecar, any core dump, any error tracker that auto-captures process env sees the key. This is pain P37 : secrets loaded from in production containers leak via . A second failure chains. A developer runs the staging deploy from a shell where was set hours earlier. The loader picks the prod , staging answers with a prompt commit tuned only for the prod model tier, latency doubles. Two root causes: no type-safe env gate, no sta…