Codex Knowledge Base
Filesystem-Aware Skill Loading and Unix Socket Sandbox Allowlists
Version 0.121.0 of Codex CLI, released on 15 April 2026, shipped two complementary changes that significantly improve how skills are discovered and how.
Cross-Model Security Testing for AI-Generated Code: Building a Defence-in-Depth Pipeline
AI coding agents write functional code at impressive speed. They do not, however, write secure code at impressive speed. Veracode's Spring 2026 GenAI Code.
The Composable AI Coding Stack: How Cursor, Claude Code, and Codex Became Three Layers
Nobody planned this architecture. Cursor, Claude Code, and Codex CLI were built by three separate companies with three separate business models.
From Reactive to Proactive: How Codex Memory + Thread Automations Create Self-Directing Agents
For most of its life, Codex CLI has been a sophisticated executor: you tell it what to do, and it does it well. Platform release 26.415 and CLI v0.121.0.
Codex Exec as a Unix Citizen: Stdin Piping, Structured Output, and Shell Composition
The Unix philosophy — small tools, text streams, composable pipelines — has shaped how developers think about automation for over fifty years.
Codex CLI Observability with OpenTelemetry: Tracing Agent Sessions, Tool Calls, and API Requests
As coding agents move from individual experimentation to team-wide adoption, the question shifts from does it work? to how well is it working.
The April 2026 Model Deprecation Wave: Migrating Your Codex CLI Configuration
On 14 April 2026, OpenAI completed the largest model retirement in Codex CLI's history. Six models — gpt-5.2-codex, gpt-5.1-codex-mini, gpt-5.1-codex-max.
Goal Mode: Persistent Objectives with Token Budgets and Autonomous Continuation
Codex CLI has steadily expanded its autonomy surface — from --full-auto mode through subagent workflows and codex exec for headless batch runs. But every.
Execution Policy Rules in Codex CLI: Starlark-Based Command Governance for Teams
Every senior developer running Codex CLI has felt the friction: approve git status, then approve git diff, then approve git log — each individually, each.
Mastering Context Compaction in Codex CLI: Tuning Auto-Compact for Long-Running Sessions
Context compaction is the mechanism that lets Codex CLI sessions run for hours — even up to seven hours on complex tasks — without hitting context window.