LangChain
The most widely used framework for building applications on language models, with tracing and evaluation alongside.
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About LangChain
LangChain provides the plumbing for model-backed applications — prompt management, retrieval, tool calling, agent loops — across Python and JavaScript, with LangGraph for stateful multi-step agents and LangSmith for tracing and evaluation. Its ubiquity is its main advantage: whatever you are trying to do, someone has done it and written it down. Its abstractions are also a common complaint.
What We Love
- ✓Enormous ecosystem and documentation
- ✓Observability tooling is genuinely good
- ✓Model-agnostic
Limitations
- ✗Abstractions add indirection
- ✗API has churned across versions
- ✗Easy to over-engineer with
Details
Specifications
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