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langchain-dependencies

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INVOKE THIS SKILL when setting up a new project or when asked about package versions, installation, or dependency management for LangChain, LangGraph, LangSmith, or Deep Agents. Covers required packages, minimum versions, environment requirements, versioning best practices, and common community tool packages for both Python and TypeScript.

config/skills/langchain-dependencies/SKILL.md

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<overview>
The LangChain ecosystem is split into focused, independently-versioned packages. Understanding which packages you need — and their version constraints — prevents incompatibilities and keeps upgrades predictable.

**Key principles:**
- **LangChain 1.0 is the current LTS release.** Always start new projects on 1.0+. LangChain 0.3 is legacy maintenance-only — do not use it for new work.
- **langchain-core** is the shared foundation: always install it explicitly alongside any other package.
- **langchain-community** (Python only) does NOT follow semantic versioning; pin it conservatively.
- **LangGraph vs Deep Agents:** choose one orchestration approach based on your use case — they are alternatives, not a required stack (see [Framework Choice](#framework-choice) below).
- Provider integrations (model, vector store, tools) are installed separately so you only pull in what you use.
</overview>

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## Environment Requirements
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