---
id: "entity-langchain"
type: "entity"
entityType: "organization"
canonicalName: "LangChain"
aliases: []
url: "https://www.langchain.com/"
source_timestamps: ["00:05:42"]
tags: ["ai-infrastructure", "rag", "developer-tools"]
related: ["entity-harrison-chase", "concept-context-engineering", "prereq-rag-pipelines"]
sources: ["s24-prompt-engineering-dead"]
sourceVaultSlug: "s24-prompt-engineering-dead"
originDay: 24
---
# LangChain

## Profile

**LangChain** is one of the de facto standard open-source frameworks for building applications with LLMs, including RAG pipelines (see [[prereq-rag-pipelines]]) and agent orchestration. Founded by [[entity-harrison-chase]].

## Role in This Source

Referenced indirectly via the [[quote-harrison-chase-context|Harrison Chase quote]] about [[concept-context-engineering]]. LangChain (alongside LlamaIndex) is treated by adjacent literature as the kind of tooling that *enabled* the era of context engineering by abstracting away the plumbing of retrieval and chaining.

The speaker's argument is that even tools as sophisticated as LangChain are *not enough* — they solve Layer 1/2 plumbing, but not Layer 3 [[concept-intent-engineering|intent]].