Langsmith

• It's a Langchain Addon
• https://www.langchain.com/langsmith/observability
• It's an observability and debugging toolkit
• It's an external paid service
• All you need to do on your langchain project is to configure the proper envs
• UI: https://smith.langchain.com/public/8d58a192-1231-4e47-8fe9-5b2affc5c526/r/876e2229-801f-4548-a17e-6a5569bd2808

LANGSMITH_TRACING=true
LANGSMITH_PROJECT=hello-world
LANGSMITH_API_KEY=...

• Open source alternatives:
• Langfuse