Codex Zero to Hero
Module 22: Skills, MCP, Subagents, and Expert Agent Workflows
A practical module for moving from concept to safe Codex execution.
Learning Outcomes
- Explain the topic in beginner-friendly language.
- Prompt Codex with context, constraints, and done-when criteria.
- Review output safely before publishing.
Safety Note
Use branches, backups, previews, and human review. Do not deploy untested code or commit secrets.
Module progress
0/7 lessons complete – 0% complete
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Lessons
What Skills Are
By the end, learners can explain what skills are, ask Codex for focused help, review the result, and decide the next safe step.
What MCP Is
By the end, learners can explain what mcp is, ask Codex for focused help, review the result, and decide the next safe step.
When to Use Connectors and MCP Servers
By the end, learners can explain when to use connectors and mcp servers, ask Codex for focused help, review the result, and decide the next safe step.
Subagents and Parallel Review
By the end, learners can explain subagents and parallel review, ask Codex for focused help, review the result, and decide the next safe step.
Custom Agents and Role Design
By the end, learners can explain custom agents and role design, ask Codex for focused help, review the result, and decide the next safe step.
Evaluation Loops and Scored Improvement
By the end, learners can explain evaluation loops and scored improvement, ask Codex for focused help, review the result, and decide the next safe step.
Module Capstone: Expert Agent Workflow
By the end, learners can explain module capstone: expert agent workflow, ask Codex for focused help, review the result, and decide the next safe step.
Module Project
Create a practical artifact for skills, mcp, subagents, and expert agent workflows: a prompt pack, checklist, issue brief, page draft, QA report, or deployment note.
Quiz
- What context should Codex inspect first?
- What should you review before accepting changes?
- What rollback step protects the work?
Answer key
Inspect relevant files and errors, review diffs and tests, and keep a backup, branch, or preview rollback plan.
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