OpenCode AI for Beginners

Stop paying monthly seat fees for closed, proprietary AI tools that lock you into rigid models and usage caps. Take control of your coding toolchain with OpenCode—the fast, open-source terminal agent that lets you assemble your own AI programming stack.

In OPENCODE AI FOR BEGINNERS, Marc Gatsu provides an honest, zero-jargon roadmap to building software with open-source coding agents. You do not need to be a command-line wizard or an AI engineer to get started; if you can open a terminal and describe what you want built, you already have every skill required to orchestrate a tireless AI pair programmer directly on your computer.

Inside this practical manual, you’ll discover:Terminal-First Agility: Tour the interactive Terminal User Interface (TUI), monitor live tool-call traces, and select high-performance terminals like Ghostty, Kitty, or Warp.True Model Independence: Seamlessly switch between free tiers on OpenCode Zen, flat-rate bundles like OpenCode Go, bring-your-own API keys, or offline local models without changing your workflow.Precision Controls: Eliminate token bloat by referencing exact files with @ mentions and executing zero-token terminal commands instantly using ! shell mode.Project Rulebooks (AGENTS.md & DESIGN.md): Set persistent constraints, tech-stack rules, and UI design standards once so your agent never writes generic code or overrides project conventions.Build vs. Plan Modes: Master full-permission execution in Build mode and safe, read-only architectural exploration in Plan mode.Parallel Subagents: Delegate code reviews, security scans, and codebase exploration to isolated subagent threads that protect your main conversation’s context budget.Custom Commands & Modular Skills: Package multi-step git routines and framework expertise into simple slash commands and portable SKILL.md configurations.Headless Automation & Cloud Integration: Execute one-shot scripts with opencode run, launch local API servers via opencode serve, and manage browser sessions effortlessly.Whether you are building your first web application, debugging complex codebases, or looking for a free, transparent alternative to proprietary subscriptions, this book gives you the tools to own your development workflow.