langgraph-fundamentals: a Claude Code skill by LangChain

Official

For developers building agent workflows in LangGraph with Python or TypeScript. Skip it if you are not using LangGraph or a single prompt or simple chain already does the job.

Copy install command View the source

Score: 73of 100
Rank: #151of 239
Installs: 19Kon skills.sh
Security: Clear 5 scanners
Updated: Nov 102026
Context: ~43tokens always

Install

npx skills add https://github.com/langchain-ai/langchain-skills --skill langgraph-fundamentals

Run it in your terminal. View the source

Using the Claude app rather than Claude Code? You can add a skill there too. How to add it in the app

What does langgraph-fundamentals do?

langgraph-fundamentals is a skill from LangChain that teaches Claude the core of LangGraph, which models agent workflows as directed graphs. It walks through a five-step design method: map the steps, classify each as an LLM, data, action or user-input step, design shared state, build nodes, then wire edges and compile. Tables explain when to use add_edge, conditional edges, Command or Send for fan-out, which stream mode to pick, and how to handle errors with retry policies, ToolNode or interrupt(). It warns that Command routing does not cancel static edges, so both paths run. Python and TypeScript references hold the code.

When should you use langgraph-fundamentals?

Use it when

You are starting a new LangGraph agent
Your graph runs a node you did not expect
You need parallel workers with Send

Skip it when

You are not using LangGraph
A single prompt or simple chain is enough

What it needs and what it can touch

You need

A Python or TypeScript project with LangGraph

What it can do

Reads and edits project files

From reading its instructions, not from running it.

Why it scores 73

Strongest on upkeep (100 of 100), weakest on adoption (38).

Adoption35 points 38
Upkeep20 points 100
Trust20 points 100
Quality15 points 85
Reader answers10 points Not enough answers yet, so this does not count

How the formula works

Is langgraph-fundamentals safe to install?

Every scanner that checked it passed it. Scanners often miss what other scanners catch, and a skill can change after a scan. Read its source before you install it.

Scanner	Result	Date
Gen Agent Trust Hub	Passed	Sep 17, 2026
Socket	Passed	Sep 17, 2026
Snyk	Low risk	Sep 17, 2026
Runlayer	Passed	Mar 4, 2026
ZeroLeaks	Passed	Apr 16, 2026

Details

Installs: 19,029
Repository stars: 1,331
Last repository change: Nov 10, 2026
Tokens always loaded: about 43
Tokens when used: about 1,419
License: MIT
Data confidence: High

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