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langchain-multi-env-setup

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plugins/saas-packs/langchain-py-pack/skills/langchain-multi-env-setup/SKILL.md

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# LangChain Multi-Env Setup (Python)

## Overview

A team ships a LangChain 1.0 service to staging with `python-dotenv` loading
`.env.staging` into `os.environ`. Security audits —
[Credential-related source omitted]
plain text. Anyone with `kubectl exec`, any sidecar, any core dump, any
error tracker that auto-captures process env sees the key. This is pain
**P37**: secrets loaded from `.env` in production containers leak via `env`.

A second failure chains. A developer runs the staging deploy from a shell
where `LANGCHAIN_ENV=production` was set hours earlier. The loader picks
the prod `.env`, staging answers with a prompt commit tuned only for the
prod model tier, latency doubles. Two root causes: no type-safe env gate,
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