Codex Knowledge Base
The Official Codex Prompting Guide: System Prompts, Personality Modes, and Custom Harness Patterns
OpenAI's Cookbook contains a document that most Codex CLI users never read: the Codex Prompting Guide.
Migrating Custom Prompts to Skills: The v0.117.0 Breaking Change and Practical Conversion Guide
If you upgraded Codex CLI to v0.117.0 and found your /prompts: slash commands had vanished, you are not alone. OpenAI removed the custom prompts subsystem.
Test-Driven Development with Codex CLI: The Red-Green-Refactor Loop, AGENTS.md Test Gates, and Hook-Based Verification
The TDD AI agent pattern has emerged as the most reliable way to execute autonomous coding in 2026.
The Complete Codex CLI Pricing Guide: Subscriptions, Tokens, Cost Optimisation, and Competitive Analysis
Every AI coding agent runs on tokens, and tokens cost money. Codex CLI is unique among major AI coding agents: it is open-source, runs locally, and supports.
IBM Bob vs Codex CLI: Enterprise Agentic Coding Agents Compared
IBM Project Bob and OpenAI Codex CLI both call themselves agentic coding tools. They solve fundamentally different problems. Bob is an enterprise IDE built.
Codex CLI Agent Notifications: Desktop Alerts, Audio Chimes, and Multi-Agent Monitoring
When you run a single Codex CLI session in the foreground, you see everything happen in real time.
Codex CLI and Jira: Issue-Driven Development with the Atlassian MCP Server
Most engineering teams track work in Jira. Most AI coding agents ignore Jira entirely.
The AI Capability Gap: Why Karpathy Says Codex CLI Users Live in a Different Reality
Andrej Karpathy posted a thread on April 9, 2026 that crystallised something Codex CLI practitioners have felt for months: the people who use frontier.
WebRTC Realtime Voice in Codex CLI: Voice Selection, Session Architecture, and Production Readiness
As of the April 9 alpha batch, WebRTC is the default realtime transport in Codex CLI . This is not a minor configuration tweak — it rewires how voice flows....
Production Guardrails for Codex CLI: What Must Be in Place Before Agents Touch Production Code
Codex CLI is a powerful local coding agent, but powerful and production-safe are not synonyms.