Skip to main content
affpapa.org
RU EN
skill

langgraph · davila7 — Claude Code skill: build agents as graphs

A Claude skill for building LangGraph agents: state, branching, checkpointers and the ReAct loop.

Install into Claude Code · claude-code-templates All methods and platforms ↓ 
npx claude-code-templates@latest --skill ai-research/langgraph
Open on GitHub

What langgraph does

This skill turns Claude into a LangGraph architect. It walks through StateGraph construction: declaring state, adding nodes and edges, wiring conditional routing. Reducers get their own treatment — add_messages appends instead of overwriting, and a custom reducer can merge dicts coming from several nodes.

Inside are code templates: a basic ReAct agent with ToolNode, state with multiple reducers, branching on query type. There is also an anti-patterns section. A loop with no exit burns tokens, and stateless nodes throw away the main LangGraph benefit — you cannot resume a conversation.

You need Python 3.9+, the langgraph package and LLM API access such as OpenAI or Anthropic. If your graph has a cycle, put an iteration counter in state: without an exit condition the agent loops and hits your request limit.

What it helps with

  • build a ReAct agent that calls tools
  • define state with reducers for accumulating data
  • route queries into branches with conditional edges
  • add a checkpointer and resume a conversation
  • catch an infinite loop in an agent graph

Example prompts for the agent

  • help me build a StateGraph for an agent with search and a calculator
  • write state with a reducer that merges findings from several nodes
  • add an exit condition based on an iteration counter

How to install langgraph

1claude-code-templates

npx claude-code-templates@latest --skill ai-research/langgraph

2Skills CLI (Vercel)

npx skills add davila7/claude-code-templates --skill langgraph -a claude-code

3Manually: put the files in place

~/.claude/skills/langgraph/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/langgraph/

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about langgraph

How do I install langgraph in Claude?

Use the templates: npx claude-code-templates@latest --skill ai-research/langgraph. Or run npx skills add davila7/claude-code-templates --skill langgraph -a claude-code.

What does the langgraph skill do?

It helps you design LangGraph agents: graphs, state, reducers, branching, checkpointers and human-in-the-loop patterns. Code templates and common mistakes are included.

What do I need to run it?

Python 3.9+, the langgraph package installed, and LLM API access — Anthropic, Anthropic or another provider. Some familiarity with graph concepts helps.

Similar skills

Everything for AI and ML →

langgraph by other authors comes first.

langgraph sickn33 A skill for building production-grade agents with deliberate structure. Design graph topology, manage state, add cycles and branches, persist progress via checkpoints, and loop humans back into decisions. CX Codex +1 1,300installs langgraph OrchestKit A skill with 41 rules for LangGraph 1.x in Python: state schemas, node timeouts, routing, supervisors, checkpoints. Useful when you build a pipeline or a multi-agent system. CX Codex +1 359installs langgraph-persistence langchain-ai A Claude Code skill for LangGraph persistence: wiring a checkpointer, keeping conversations apart by thread_id, and replaying older graph state. CX Codex +1 18,000installs langgraph-python-quickstart langchain-ai Scaffolds a minimal local LangGraph Python agent using the official quickstart. Useful when you need to test a Graph API agent in an isolated folder. CX Codex +1 5,200installs options-analytics-agent-langgraph reason-machines Builds a LangGraph agent that pulls options data from Polygon.io, caches it in ChromaDB and keeps memory across sessions. Useful when you want your own trading assistant. CX Codex +1 2,000installs langgraph-code-review existential-birds LangGraph code review skill for Claude Code and coding agents. It flags state mutations, missing reducers, and broken graph topologies. CX Codex +1 884installs langchain-development Mindrally Gives your agent a rulebook for LangChain and LangGraph work in Python: chain composition, agents, memory, RAG. Useful once a Python LLM project outgrows one file. CX Codex +1 681installs migrating-langchain-to-pydantic-ai pydantic A skill that moves Python apps off LangChain, LangGraph and Deep Agents onto Pydantic AI. Useful when you want to keep the behavior and drop the framework shape. CX Codex +1 314installs

From the same set224

The whole set →
rollback-deploy Walks an agent through rolling a deployment back to the previous version, with safety checks and database handling. 260installs webapp-testing A slash command that drives your local web app in a real browser through Playwright: clicks, forms, screenshots, console logs. 259installs matplotlib A Claude skill for matplotlib: line plots, scatter, bar, histograms, heatmaps and 3D figures, exported to PNG, PDF or SVG. 257installs pptx-official A Claude skill that handles .pptx files end to end: reading, editing and building slide decks. Useful whenever a presentation lands in your task. 257installs i18n-localization A Claude skill covering internationalization and localization: translation keys, locale files, RTL layout and a checker script. 251installs feature-design-assistant Turns a rough feature idea into a design and spec by asking you structured questions. Useful before a large change to the codebase. 247installs setup-rate-limiting A slash command that inspects your project and builds a rate limiting setup: algorithms, per-user quotas, counter storage. 247installs nextjs-migration-helper A Claude slash command that walks a Next.js project from Pages Router to App Router, from JavaScript to TypeScript, and from class components to hooks. 237installs

Project sponsors

Companies that keep this analytics open
Gold sponsor
Nutra.Club

Impressions, clicks and code copies — open statistics. We keep the numbers public for the same reason NeBlask itself is public. Become a sponsor