Learn Agentic Coding with Codex & AI Coding Agents

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Beau Carnes AI coding agents such as Codex read your codebase, edit multiple files, and run commands and tests while they work through larger tasks with you. In Codex, an AGENTS.md file holds persistent instructions for a project, and config.toml holds the agent's configuration. We just published a course on the freeCodeCamp.org YouTube channel that will teach you how to get reliable results from a coding agent by giving it the right context, planning the work, controlling its permissions, and verifying every change. This course is taught by Tom Chant, Head of Education at Scrimba. You'll work through realistic tasks, including challenges on skills, characterization tests, and config.toml. The course is aimed at experienced developers adding AI to their workflow and at non-coders who want to build software with AI help. You can also study it interactively on Scrimba. In this course, you will learn: Prompting & Project SetupHow to write effective prompts and comment prompts for a coding agent, then initialize a project and use multiple AGENTS.md files. Plan Mode & SkillsHow to break larger development tasks down with Plan Mode and extend a coding agent with skills. Testing Agent ChangesHow to verify an agent's changes with characterization tests and test-driven development (TDD), and which testing pitfalls to look out for. Git & SecretsHow to use Git safely alongside a coding agent and keep API keys, credentials, and other secrets safe. Context, Permissions & config.tomlHow to use the VS Code Codex extension, manage context, control what an agent can access and change, and configure it with config.toml. MCP & shadcnHow to connect agents to external tools with the Model Context Protocol (MCP), including shadcn. Watch the full course on the freeCodeCamp.org YouTube channel (2-hour watch). Recommended courses from our partners (sidebar) Class Central (opens in a new tab) ADVERTISEMENT On Udemy AI Coder: Complete Claude Code & Coding Agents Course Ligency ​ and Ed Donner 4.6 out of 5 stars (11,741) from 11,741 ratings 16h 14m 16 hours 14 minutes Beginner Certificate View course (opens in a new tab) On Udemy MCP Crash Course: Complete Model Context Protocol in a Day Eden Marco 4.5 out of 5 stars (4,646) from 4,646 ratings 8h 30m 8 hours 30 minutes Intermediate Certificate View course (opens in a new tab) On Coursera AI Agents with Model Context Protocol & Typescript Dr. Jules White 4.8 out of 5 stars (9,212) from 9,212 ratings 4w 4 weeks, 10 hours a week Beginner Certificate View course (opens in a new tab) On Udemy Complete MCP Developer Guide: Agents, Servers & Tools Nikolai Schuler and Alejandro AO 4.5 out of 5 stars (14,596) from 14,596 ratings 6h 36m 6 hours 36 minutes Beginner Certificate View course (opens in a new tab) More Model Context Protocol courses on Class Central →(opens in a new tab) Beau Carnes I'm a teacher and developer with freeCodeCamp.org. I run the freeCodeCamp.org YouTube channel. If this article was helpful, share it. Learn to code for free. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Get started Recommended courses from our partners Class Central (opens in a new tab) ADVERTISEMENT On Udemy AI Coder: Complete Claude Code & Coding Agents Course Ligency ​ and Ed Donner 4.6 out of 5 stars (11,741) from 11,741 ratings 16h 14m 16 hours 14 minutes Beginner Certificate View course (opens in a new tab) On Udemy MCP Crash Course: Complete Model Context Protocol in a Day Eden Marco 4.5 out of 5 stars (4,646) from 4,646 ratings 8h 30m 8 hours 30 minutes Intermediate Certificate View course (opens in a new tab) On Coursera AI Agents with Model Context Protocol & Typescript Dr. Jules White 4.8 out of 5 stars (9,212) from 9,212 ratings 4w 4 weeks, 10 hours a week Beginner Certificate View course (opens in a new tab) On Udemy Complete MCP Developer Guide: Agents, Servers & Tools Nikolai Schuler and Alejandro AO 4.5 out of 5 stars (14,596) from 14,596 ratings 6h 36m 6 ho