Certification

AI-Assisted Developer: Codex

This certification is designed for developers, technical leads, platform engineers, and AI-assisted development practitioners who use OpenAI Codex as part of real software delivery workflows.

It validates the ability to frame Codex tasks clearly, provide useful context, define acceptance criteria, review generated changes, verify behavior with tests, and manage the risks that appear when AI agents interact with codebases, terminals, Git repositories, external tools, and cloud environments.

The exam covers practical Codex usage across local development, worktrees, cloud tasks, AGENTS.md guidance, sandbox and approval policies, MCP tools, skills, GitHub reviews, Slack and Linear delegation, SDK automation, app-server workflows, and enterprise governance controls.

Candidates are expected to demonstrate not only prompt-writing knowledge, but also engineering judgment: limiting scope, identifying unsafe changes, checking claims, preserving repository conventions, handling automation responsibly, and knowing when human review or stronger verification is required.

The certification is suitable for people who want to prove that they can collaborate with Codex effectively and safely in production-oriented engineering environments.

Get Certified Exam Rules

What this certification proves

Clear scope for candidates. Clear meaning for reviewers.

Passing result

What a pass confirms

This certificate confirms that the candidate demonstrated practical competence in using OpenAI Codex for AI-assisted software development, including task scoping, context management, code review, verification, safety controls, automation workflows, and responsible engineering judgment.

Scope

What the exam validates

Scope includes Codex prompting, task scoping, acceptance criteria, AGENTS.md guidance, sandboxing, approval policies, MCP tools, skills, local and worktree workflows, cloud environments, GitHub code review, Slack and Linear integrations, SDK automation, app-server concepts, enterprise governance, model usage, and verification practices.

For reviewers

What someone can verify later

The public certificate page shows the holder name, score, issue date, certificate ID, and current verification status without relying on screenshots.

Share flow

Share one record, not a bundle of files

Use the certificate page as the primary proof. PDF stays available as a convenient copy, but the live page is the canonical record.

Official certificate page

What the verifier will see

Candidate name
Score and pass outcome
Date and certificate ID
Current verification status

Preparation topics

Topics covered by the exam question set.

Use this topic map as a preparation checklist. Questions in this certification are built from these concrete topic areas.

Prompting Fundamentals

Task scoping
Acceptance criteria
Done criteria
File scope
Bug prompts
Traceback context
Test context
Prompt constraints
Assumption listing
Follow-up prompts
PR summaries

Review Verification

Human review
Targeted tests
Full suite
Test output
Regression tests
Diff review
Auth review
Validation review
Database review
Dependency review
Risk hiding
Hallucinated APIs

Safety Controls

Sandbox modes
Approval policy
Network access
Destructive commands
Workspace writes
Read-only mode
Full access
Permission prompts
Auto review
Command rules
Protected paths

Project Guidance

AGENTS loading
Instruction order
Nested overrides
Fallback files
Durable guidance
One-off guidance
Config layers
Trusted projects
CODEX_HOME
Project profiles

MCP Skills

MCP setup
Stdio servers
HTTP servers
Bearer tokens
OAuth scopes
Tool allowlists
Required servers
MCP timeouts
MCP identity
Skill metadata
Skill activation
Plugin packaging

Codex App

Local mode
Worktree mode
Cloud mode
Git worktrees
Handoff
Review pane
Inline comments
Terminal scope
Local environments
Setup scripts
Project actions
Automations

Cloud Codex

Cloud tasks
Cloud environments
Setup phase
Agent phase
Internet settings
HTTP methods
Domain allowlists
Secrets lifecycle
Universal image
Cache invalidation
Pull requests

Integrations

GitHub reviews
Automatic reviews
PR context
Review guidelines
Slack tasks
Slack setup
Linear issues
Linear triage
Linear MCP
GitHub CLI

Automation SDK

TypeScript SDK
Python SDK
Thread lifecycle
codex exec
Stdin prompts
JSON events
GitHub Action
Action outputs
App server
WebSocket auth
Dynamic tools

Enterprise Governance

Codex Local
Codex Cloud
Managed requirements
Login methods
Workspace binding
Compliance API
Analytics API
IP allowlists
Policy precedence
Group policy
Telemetry mapping

Models Usage

Model selection
Default model
Model flags
Cloud models
API keys
Usage limits
Token credits
Status command
Reasoning effort
Pricing awareness

Advanced Operations

Subagents
Parallel work
Worktree cleanup
Merge conflicts
Incident forensics
Supply chain
DBA review
Container isolation
Windows sandbox
WSL2 execution

How the certification works

From voucher purchase to public certificate.

Once the candidate decides to pursue this certification, the path is simple: buy a voucher, exchange it for this certification, complete the exam, and receive the official certificate after a successful result.

Step 01

Buy a voucher for account balance

The candidate tops up voucher balance first. DevCerts does not sell this certification as a direct one-off checkout item.

Step 02

Choose this certification and exchange the voucher

When the candidate is ready, one voucher is consumed and DevCerts opens exam access for this certification.

Step 03

Pass and receive the official certificate page

After a successful valid result is recorded, DevCerts issues the certificate, publishes the public verification page, and keeps PDF available as a secondary copy.

Current certificate policy

What this certification page promises today

A certificate is issued only after a successful valid result.
The public verification page is the canonical certificate artifact.
The issued certificate is active and non-expiring in the current MVP.

Before the exam

Read the exam rules and recommendations first

Review the time limit, pass score, retake policy, proctoring warning limits, full-screen recommendation, and preparation checklist before starting the attempt.

Read Exam Rules