Learn Claude Code
Build a coding agent from the first loop up
Start learningRead online, free, no sign-up.
- FormatSequential sessions, each with a runnable program
- LanguagesVietnamese · English
- CostFree
- PathAI agents and harness engineering
Each session adds one piece to a coding agent's harness: tool use, permissions, hooks, skills, context compaction, memory, background tasks and agent teams. Every session comes with runnable Python code.
What you will learn
- Understand the agent loop and what each harness layer adds
- Add tools, permissions and hooks to an agent yourself
- Know when an agent needs memory, context compaction or sub-agents
Who it is for
Developers who want to see inside coding agents such as Claude Code.