Codex & AI Coding Agents - Learn Agentic Coding

Learn agentic coding with AI coding agents such as Codex: prompting, plan mode, skills, testing, Git, secrets, permissions and MCP in one hands-on course. ✏️ Study this course interactively on Scrimba: https://scrimba.com/learn-agentic-coding-c0g68l84pg?via=scrimbafcc Code is available on the Scrimba course page for each lesson. Agentic coding is how many developers now build software: AI coding agents that read your codebase, edit multiple files, run commands and tests, and work through larger tasks with you. In this hands-on course, Tom Chant, Head of Education at Scrimba, shows you how to ensure reliable results from a coding agent by giving it the right context, planning work, and controlling permissions, while verifying every change. You'll work through realistic tasks covering prompting, AGENTS.md, skills, testing, Git, secrets, config.toml and the Model Context Protocol (MCP). This course suits experienced developers adding AI to their workflow and non-coders who wish to build software with AI help. We'll cover: - Writing effective prompts and comment prompts for AI coding agents - Initializing projects and setting persistent instructions with AGENTS.md - Using Plan Mode to break down larger development tasks - Extending a coding agent with skills - Verifying agent changes with characterization tests and test-driven development (TDD) - Using Git safely alongside a coding agent - Keeping API keys, credentials and other secrets safe - Managing context and configuring agents with config.toml - Controlling what an agent can access and change with permissions - Connecting agents to external tools with MCP, including shadcn Scrimba on YouTube: https://www.youtube.com/c/Scrimba ⭐️ Chapters ⭐️ 0:00:00 Intro to Agentic Coding 0:04:58 Intro to the Course 0:09:34 Prompting Basics 0:15:09 Comment Prompts 0:19:42 Two Problems 0:23:39 Initialising a Project 0:26:48 Multiple AGENTS.md files 0:28:46 Plan Mode 0:36:35 Skills Fundamentals 0:40:36 Skills challenge 1 0:44:58 Skills Challenge 2 0:47:19 Skills Challenge 2 Solution 0:50:33 Testing set up 0:55:17 Characterisation test challenge 1:01:13 Testing pitfalls 1:05:24 Test Driven Development 1:11:09 Git Hygiene 1:13:49 Version control & config files 1:15:58 Secrets 1:22:54 VS Code Codex Extension 1:26:46 Context 1:29:33 Context Management 1:34:20 Permissions 1:36:09 config.toml 1:39:46 config.toml challenge 1:43:50 MCP setup 1:46:44 MCP shadcn 🎉 Thanks to our Champion and Sponsor supporters: 👾 @omerhattapoglu1158 👾 @goddardtan 👾 @akihayashi6629 👾 @kikilogsin 👾 @anthonycampbell2148 👾 @tobymiller7790 👾 @rajibdassharma497 👾 @CloudVirtualizationEnthusiast 👾 @adilsoncarlosvianacarlos 👾 @martinmacchia1564 👾 @ulisesmoralez4160 👾 @_Oscar_ 👾 @jedi-or-sith2728 👾 @justinhual1290 -- Learn to code for free and get a developer job: https://www.freecodecamp.org Read hundreds of articles on programming: https://freecodecamp.org/news