AI Engineering Lifecycle on LangSmith Platform

Enterprise workshop series teaching the complete AI engineering lifecycle using LangChain, LangGraph, and LangSmith—centered around building a customer support agent for a fictional online technology e-commerce store called TechHub.

What You'll Build

A customer support agent system featuring:

• Multi-agent architecture with specialized Database and Documents agents coordinated by a Supervisor
• Human-in-the-loop (HITL) customer verification with LangGraph primitives
• Evaluation-driven development using offline evaluation to identify and fix bottlenecks
• Production deployment to LangSmith with online evaluation and data flywheels for continuous improvement

Quick Setup

This workshop uses uv - a fast Python package installer and resolver. If you don't have it:

# Install uv
curl -LsSf https://astral.sh/uv/install.sh | sh

Then set up the workshop:

# Clone repository
git clone https://github.com/langchain-ai/techhub-workshop.git
cd techhub-workshop

# Install dependencies (creates virtual environment automatically)
uv sync

# Configure API keys
cp .env.example .env
# Edit .env and add your API keys:
#   ANTHROPIC_API_KEY=sk-ant-...
#   LANGSMITH_API_KEY=lsv2_pt_...

# Build vectorstore (one-time setup, ~60 seconds)
uv run python data/data_generation/build_vectorstore.py

# Launch Jupyter
uv run jupyter lab

Workshop Outline

This workshop consists of three modules that take you from manual tool calling to production deployment:

1. Module 1: Agent Development - Build from basics to multi-agent systems with HITL
2. Module 2: Evaluation & Improvement - Use eval-driven development to systematically improve agents
3. Module 3: Deployment & Continuous Improvement - Deploy to production and build a data flywheel

📚 To get started, see workshop_modules/README.md

Repo Structure

techhub-workshop/
├── workshop_modules/        # Interactive Jupyter notebooks
│   ├── module_1/            # Agent Development (4 sections)
│   ├── module_2/            # Evaluation & Improvement (2 sections)
│   └── module_3/            # Deployment & Continuous Improvement (2 sections)
│
├── agents/                  # Reusable agent factory functions
│   ├── db_agent.py          # Database queries (rigid tools)
│   ├── sql_agent.py         # Flexible SQL generation (improved)
│   ├── docs_agent.py        # RAG for product docs & policies
│   ├── supervisor_agent.py  # Multi-agent coordinator
│   └── supervisor_hitl_agent.py  # Full verification + routing system
│
├── tools/                   # Database & document search tools
│   ├── database.py          # 6 DB tools (orders, products, SQL)
│   └── documents.py         # 2 RAG tools (products, policies)
│
├── evaluators/              # Evaluation metrics
│   └── evaluators.py        # Correctness & tool call counters
│
├── deployments/             # Production-ready graph configurations
│   ├── db_agent_graph.py                   # Baseline database agent
│   ├── docs_agent_graph.py                 # RAG documents agent
│   ├── sql_agent_graph.py                  # Improved SQL agent
│   ├── supervisor_agent_graph.py           # Basic supervisor
│   ├── supervisor_hitl_agent_graph.py      # Supervisor with verification
│   └── supervisor_hitl_sql_agent_graph.py  # Complete system (best)
│
├── data/                    # Complete dataset & generation scripts
│   ├── structured/          # SQLite DB + JSON files
│   ├── documents/           # Markdown docs for RAG
│   ├── vector_stores/       # Pre-built vectorstore
│   └── data_generation/     # Scripts to regenerate data
│
├── config.py                # Workshop-wide configuration
├── langgraph.json           # LangGraph deployment config
└── pyproject.toml           # Dependencies

Key Concepts Covered

• Agent Development: Tool calling, multi-agent systems, supervisor pattern, HITL with interrupts
• Evaluation & Testing: Offline evaluation, LLM-as-judge, trace metrics, eval-driven development
• Deployment & Production: LangSmith deployments, online evaluation, annotation queues, SDK integration
• Best Practices: Factory functions, state management, dynamic prompts, structured outputs, streaming

See workshop_modules/README.md for detailed breakdown by module.

Dataset Overview

The TechHub dataset is a high-quality synthetic e-commerce dataset:

• 50 customers across consumer, corporate, and home office segments
• 25 products (laptops, monitors, keyboards, audio, accessories)
• 250 orders spanning 2 years with realistic patterns
• 439 order items with product affinity patterns
• SQLite database (156 KB) with full schema and indexes
• 30 documents (25 product specs + 5 policies) for RAG

All data is ready to use! See data/data_generation/README.md for details.

Additional Resources

Documentation

• Data Generation Guide: data/data_generation/README.md - Complete dataset documentation
• Database Schema: data/structured/SCHEMA.md - Full schema reference
• RAG Documents: data/documents/DOCUMENTS_OVERVIEW.md - Document corpus guide
• Agent Architecture: agents/README.md - Agent factory patterns

External Links

• LangChain Python Docs
• LangGraph Python Docs
• LangSmith Platform
• LangChain Academy

Prerequisites

Required (Complete Before Workshop)

Free courses from LangChain Academy:

• LangChain Essentials - Python (30 min)
• LangGraph Essentials - Python (1 hour)
• LangSmith Essentials (30 min)

Recommended (For Deeper Understanding)

• Foundation: Introduction to LangGraph (6 hours)
• Foundation: Introduction to Agent Observability & Evaluations (3.5 hours)

Technical Requirements

• Python 3.10+
• API Keys:
  • LangSmith (free tier: smith.langchain.com)
  • Anthropic or OpenAI (workshop uses Claude Haiku 4.5 by default)
• Tools: Git, Jupyter, uv (or pip)

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

Educational workshop materials. Synthetic dataset free to use and distribute.

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Ready to begin? Open workshop_modules/module_1/section_1_foundation.ipynb and start building! 🚀