langgraph-builder

Build stateful LangGraph agents with StateGraph, checkpointing, and FastAPI deployment.

Updated Aug 23, 2026
One-click install
npx skills add https://github.com/TerraCo89/Cernji-Agents --skill langgraph-builder
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: langgraph-builder
Source: https://github.com/TerraCo89/Cernji-Agents/tree/main/.claude/skills/langgraph-builder
Command: npx skills add https://github.com/TerraCo89/Cernji-Agents --skill langgraph-builder

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires langgraph, langchain-core, anthropic, openai, fastapi, uvicorn, and includes examples (resource) and references (resource) components.

What problem does it solve?

This Skill provides comprehensive guidance for building complex, stateful conversational AI agents using LangGraph. It addresses common challenges like message format inconsistencies, conversation persistence, and web deployment, enabling you to create robust and production-ready agents efficiently.

Core Features & Use Cases

  • StateGraph Workflows: Guides you through defining agent state, nodes, and edges for complex conversational flows.
  • Conversation Persistence: Implements checkpointing to maintain conversation history across interactions.
  • Agent Chat UI Integration: Provides patterns for seamlessly connecting your LangGraph agent to a web-based chat interface.
  • FastAPI Deployment: Offers production-ready patterns for serving your agents via FastAPI with streaming support.
  • Use Case: "Create a new LangGraph agent that manages job applications", "Implement StateGraph for a multi-turn customer support agent", or "Add chat UI to my existing LangGraph agent" to quickly bring your AI agent ideas to life.

Quick Start

Start a minimal LangGraph agent server

python examples/minimal_agent.py --server

Test the API with a chat message

curl -X POST http://localhost:8080/chat
-H "Content-Type: application/json"
-d '{"message": "Hello, my name is Alice", "thread_id": "test-123"}'