langchain-install-auth

【效率与协作】Install and configure LangChain SDK with provider authentication. Use when setting up a new LangChain project, configuring API keys for OpenAI/Anthropic/Google, or initializing @langchain/core in Node.js or Python. Trigger: "install langchain", "setup langchain", "langchain auth", "configure langchain API key", "langchain credentials".

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