Codex Knowledge Base
v0.124 Hooks Migration Guide: From hooks.json to Inline config.toml
Codex CLI v0.124.0, released on 23 April 2026, marks hooks as stable and introduces inline hook definitions directly inside config.toml and requirements.toml.
Codex Chronicle and Screen-Context Memories: Ambient Developer Awareness for AI Coding Agents
On 20 April 2026, OpenAI shipped Chronicle as a research preview inside the Codex macOS app . The feature augments Codex's existing memory system with.
Chrome DevTools MCP and Codex CLI: Closing the Browser Debugging Gap for AI Coding Agents
Every terminal-native coding agent shares one blind spot: the browser. An agent can refactor your React component tree in seconds, but when the rendered.
Browser-in-the-loop testing: Playwright + Chrome DevTools MCP + Codex CLI
Coding agents write code they cannot see running. They generate a component, commit it, and hope the browser agrees. Browser-in-the-loop testing closes that gap.
AWS AgentCore's Managed Harness and Coding Skills: What They Mean for Codex CLI Teams
On 22 April 2026, AWS announced three additions to Amazon Bedrock AgentCore: a managed agent harness, a dedicated AgentCore CLI, and pre-built coding skills.
Automated Harness Synthesis: What AgentFlow's Typed Graph DSL Means for Codex CLI Orchestration
Two independent research papers dropped within 48 hours of each other in late April 2026, and together they crystallise a thesis that practitioners have.
Agent Sandbox Comparison Matrix: Codex Seatbelt vs NVIDIA OpenShell vs Docker sbx
Autonomous coding agents need guardrails. Give a model unrestricted shell access and it will eventually rm -rf something you care about, exfiltrate.
GPT-5.5 Drops: What Changes for Codex Users
Six weeks. That is the gap between GPT-5.4 and GPT-5.5. OpenAI released its newest frontier model on 23 April 2026, rolling it out simultaneously to ChatGPT.
Legacy Code Archaeology with Codex CLI: Understanding, Documenting, and Safely Modernising Unfamiliar Codebases
Every senior developer has faced it: a critical system written by people who left years ago, sparse documentation, no tests.
MCP Schema Bloat and System Prompt Tax: Performance Impact of Tool Definitions
Every MCP server you connect to Codex CLI injects its full tool manifest — JSON schemas with parameter descriptions, type annotations, enum constraints.