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Free 2-hour Codex course covers agents, TDD, MCP, and secrets

Cagri Sarigoz

Published November 11, 2026

freeCodeCamp just dropped a free two-hour course on agentic coding with Codex, taught by Tom Chant, Head of Education at Scrimba. It covers the full workflow: prompting, planning, testing, secrets management, permissions, and MCP integrations.

What the Course Covers

The course targets two audiences: experienced developers folding AI into an existing workflow, and non-coders who want to build software with AI assistance. Six topic areas:

• Prompting and project setup: Writing effective prompts and comment prompts, initializing a project, and working with multiple AGENTS.md files.
• Plan Mode and skills: Breaking larger tasks into manageable chunks with Plan Mode and extending the agent with custom skills.
• Testing agent changes: Verifying output with characterization tests and test-driven development, plus common testing pitfalls to avoid.
• Git and secrets: Using Git safely alongside a coding agent and keeping API keys and credentials out of the agent’s reach.
• Context, permissions, and config.toml: Managing what the agent can read and change via the VS Code Codex extension and config.toml configuration.
• MCP and shadcn: Connecting agents to external tools through the Model Context Protocol, including shadcn.

Quick Background on Codex

Codex is an AI coding agent that reads your codebase, edits multiple files, and runs commands and tests as it works through tasks. Two files drive its behavior on a project: AGENTS.md for persistent instructions and config.toml for agent configuration.

The course is also available interactively on Scrimba. Watch it free on the freeCodeCamp YouTube channel.

Cagri Sarigoz( Founder )

I’m founder of BizStack at Cagri Sarigoz LLC and a passionate advocate for entrepreneurs.

With over 14 years in tech, marketing, and AI, including my role as Head of SEO at CitizenShipper and co-founder of TaleBot at Intale AI, I’m dedicated to sharing genuine, useful product insights and tips.

At BizStack, I aim to cut through the digital noise to provide clear, actionable advice.

And more than all else, I’m a father to a (always) little girl and a husband.

Contact me at [email protected] for assistance.