LangChain 1 cheatsheet
LangChain 1: Setup
4 common LangChain 1 tasks.
Install LangChain
Install the core package. Add a provider package for the model you use.
pip install -U langchain
Install a model provider
Install the integration package for Anthropic. Other providers have packages such as langchain-openai.
pip install -U langchain-anthropic
Set the provider API key
The integration reads the key from an environment variable. Use your own key and keep it out of source control.
export ANTHROPIC_API_KEY="your-api-key"
Turn on LangSmith tracing
Send traces of every run to LangSmith to inspect prompts, tool calls and latency.
export LANGSMITH_TRACING=true
export LANGSMITH_API_KEY="your-api-key"