INVOKE THIS SKILL when writing ANY LangGraph code. Covers StateGraph, state schemas, nodes, edges, Command, Send, invoke, streaming, and error handling.
Install
npx skills add langchain-ai/langchain-skills --skill langgraph-fundamentalsnpx skills add langchain-ai/langchain-skills --skill langgraph-fundamentals -a claude-code -gnpx skills add langchain-ai/langchain-skills --skill langgraph-fundamentals -a codex -ggemini skills install https://github.com/langchain-ai/langchain-skills.git --path config/skills/langgraph-fundamentalsgh skill install langchain-ai/langchain-skills langgraph-fundamentalsgit clone --depth 1 https://github.com/langchain-ai/langchain-skills /tmp/langchain-ai__langchain-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/langchain-ai__langchain-skills/config/skills/langgraph-fundamentals ~/.claude/skills/langgraph-fundamentals # Claude Code
cp -R /tmp/langchain-ai__langchain-skills/config/skills/langgraph-fundamentals ~/.agents/skills/langgraph-fundamentals # Codex, Cursor, Gemini CLI, Copilot, OpenCode