Codex Level Up - Portfolio Site Practice
About 5 minutes
Target audience: Readers who want to practice Codex Levels 0 through 10 through real repository work
Prerequisites: An overview of the Codex levels
Codex Level Up applies the Codex Levels 0-10 definitions to real repository work through a Next.js personal portfolio site.
Each level adds the capability and deliverable associated with its title. Make the current stage reproducible before moving higher.
How to Use the Tutorials
Section titled “How to Use the Tutorials”Each level moves from defining the deliverable through practice, verification, and troubleshooting:
- What you will complete - Confirm the deliverable and delegation boundary.
- Steps 1-3 - Set the boundary, practice, and verify completion.
- Check - Record evidence from diffs, commands, pages, or reviews.
- Troubleshooting - Correct scope expansion and vague completion criteria.
Tutorial Flow
Section titled “Tutorial Flow”| Level | Title | Practice | Typical deliverable |
|---|---|---|---|
| Level 0 | Chat Advisor | Define requirements before opening the repository | Portfolio requirements note |
| Level 1 | Repository Reader | Read the repository and produce a change plan | Related-file map and change plan |
| Level 2 | Focused Editor | Make a bounded ProjectCard edit | Small reviewable diff |
| Level 3 | Verified Implementer | Implement multiple pages and finish verification | Page implementation and validation results |
| Level 4 | Context Engineer | Persist working rules in AGENTS.md | AGENTS.md and scoped instructions |
| Level 5 | GitHub Collaborator | Work from an issue through pull request review | Issue-linked branch and pull request |
| Level 6 | Harness Builder | Build a harness for permissions and validation | Harness with approvals, prohibitions, and checks |
| Level 7 | Tool Operator | Verify the UI with browser and connector tools | Validation record with evidence beyond code |
| Level 8 | Parallel Orchestrator | Implement independent tasks in parallel | Conflict-aware task split and integrated result |
| Level 9 | Workflow Operator | Automate recurring validation and triage | Recurring workflow with stop conditions |
| Level 10 | Agent Platform Architect | Design an operating model for multiple agents | Platform design with evaluation, audit, and improvement |
Getting Started
Section titled “Getting Started”Start with Level 0 or begin at the stage identified in Codex Levels.
See the references for the external specifications and background sources used on this page.[1][2]
References
Section titled “References”- OpenAI, Codex documentation
- OpenAI, OpenAI API documentation