Q: Why is @langchain/core missing in my monorepo install?

@langchain/core is a peer dependency and is not always hoisted automatically in yarn workspaces or monorepos. Always list it explicitly in your package.json dependencies alongside @langchain/langgraph.

Question 1

How do I set up dependencies for a new LangGraph project?

Accepted Answer

Install langchain, langchain-core, langgraph, and langsmith at version 1.0 or higher, then add your model provider package such as langchain-openai or langchain-anthropic. For TypeScript, use @langchain/core, langchain, @langchain/langgraph, and langsmith.

Question 2

LangGraph vs Deep Agents: which should I use?

Accepted Answer

Choose LangGraph when you need fine-grained graph control with custom workflows, loops, or branching. Choose Deep Agents when you want batteries-included planning, memory, and file context; it installs LangGraph as a transitive dependency.

Question 3

Does LangChain 1.0 support Python 3.9 or older Node versions?

Accepted Answer

LangChain 1.0 requires Python 3.10 or higher and Node.js 20 or higher. Older runtimes are not officially supported, so verify your runtime version before installing.

Question 4

Why does langchain-community break after upgrading?

Accepted Answer

langchain-community does not follow semantic versioning, so minor releases can contain breaking changes. Pin it to an exact minor series like >=0.4.0,<0.5.0, or switch to a dedicated integration package such as langchain-chroma when one exists.

Question 5

Why is @langchain/core missing in my monorepo install?

Accepted Answer

@langchain/core is a peer dependency and is not always hoisted automatically in yarn workspaces or monorepos. Always list it explicitly in your package.json dependencies alongside @langchain/langgraph.

langchain-dependencies

SYSTEM DOCUMENTATION & REQUIREMENTS

Frequently Asked Questions about langchain-dependencies

Related Skills

langchain-dependencies

langchain

langsmith-observability

agent-orchestration-frameworks