Stop guessing how to use AI in your codebase. Start building with a workflow that holds up in real projects. Most developers have tried AI coding tools — autocomplete here, a chat window there. But turning AI into a reliable part of day-to-day development is still hard. Claude Code is it works in the terminal, reads your codebase, and operates within your project's rules and workflows. This book shows you how to use it through the story of Tanaka, a mid-career developer who grows from experimentation to leading AI-driven development in a real team.What You'll LearnSetup and Configuration — Install Claude Code, configure CLAUDE.md, and establish project rules you can operationalize across your teamPlan Mode and Subagents — Break complex tasks into manageable steps and let Claude Code handle them in parallelMCP Integration — Connect Claude Code to external tools, databases, and APIs through the Model Context ProtocolAgent Teams — Orchestrate multiple AI agents working together on large-scale refactoring and feature developmentGit Worktree Workflows — Run parallel development branches with AI assistance without conflictsTeam Adoption Strategy — Introduce AI-driven development to your team with shared conventions and quality controlsWhy This Book Is DifferentMost AI tool books give you a feature list. This one gives you a story — and then puts you to work. Each chapter follows Tanaka, a working developer navigating a real codebase, as he tackles practical onboarding onto legacy code, debugging production issues under pressure, convincing a skeptical team to adopt new tools. You learn the how through hands-on terminal exercises and the why through his experience.Who This Book Is ForDevelopers who have used AI coding tools but want deeper integration into real workflowsEngineers working with large, existing codebases who need practical AI-assisted strategiesTeam leads exploring how to roll out AI-driven development across their organizationAnyone who prefers learning through narrative over dry documentation Basic programming experience and familiarity with Git. No prior Claude Code experience required. Covers Plan Mode, subagents, MCP, hooks, skills, and Agent Teams.