Appendices

Building Real-World Agentic AI Systems with LangGraph

The printed book and the ebook refer to seven appendices, A to G. They live here, so the printed book stays a manageable size. Each is reference material for the chapters: the fast path back to a pattern, or a look at a surface the book chose not to build on.

• Appendix A: Environment, Setup, and the Companion Repo - the companion repo and the seeded backends every Atlas increment runs against.
• Appendix B: Migrating from 0.x to 1.x - the 0.x-to-1.x migration map for readers arriving from an older LangChain.
• Appendix C: API Quick Reference - the core signatures as a lookup table.
• Appendix D: Glossary of Core Concepts and Supporting Terms - six core concepts and twenty supporting terms, each with the chapter that argued for it.
• Appendix E: The Deep Research Agent - the research arm’s two builds side by side.
• Appendix F: The Functional API - a second way to write the same durable workflows.
• Appendix G: Retrieval for Atlas - the retrieval box behind search_kb.

The code they print is the companion repo’s, at the code-v1.2 tag.