Codex Knowledge Base
codex mcp: Managing MCP Servers Entirely from the Terminal
The Model Context Protocol gives Codex CLI access to third-party tools — GitHub operations, database queries, documentation lookups, browser automation.
Codex for Chrome: Browser Integration for Authenticated Workflows
Codex has always been strongest in the terminal and the editor. But a surprising number of developer tasks live behind a browser login — updating a Jira.
Codex CLI v0.129: The /hooks Browser, Compaction Hooks, and Runtime Hook Management
Codex CLI v0.129.0, released on 7 May 2026, ships three hook-related capabilities that developers have been requesting since the hooks engine stabilised in.
Codex CLI for Terraform and OpenTofu Teams: MCP Servers, Safety Hooks, and AGENTS.md Patterns for Infrastructure as Code
Infrastructure as code occupies an unusual position in the AI-assisted coding landscape. The blast radius of a bad change is not a failing test or a broken.
Codex CLI for Ruby on Rails Teams: RuboCop MCP, RSpec Workflows, and Convention-Friendly AGENTS.md Patterns
Rails has always been opinionated about structure. Models live in app/models/, controllers in app/controllers/, views in app/views/.
The OpenAI Developer Docs MCP Server: Giving Codex CLI Live Access to Its Own Documentation
Documentation MCP servers have become essential infrastructure for coding agents. Context7 indexes thousands of third-party libraries; Repomix serves.
Codex CLI Official Workflow Recipes: Nine Patterns That Structure the Developer Loop
OpenAI's developer documentation now includes a dedicated Workflows page that codifies nine canonical patterns for using Codex CLI across the software.
Codex CLI Model Routing in May 2026: GPT-5.5, GPT-5.4, Codex-Spark, and When to Use Each
The model lineup available to Codex CLI developers has changed materially since March 2026. GPT-5.5 arrived in late April as the new frontier, GPT-5.4.
The Codex CLI Instruction Stack: How Six Configuration Surfaces Shape Agent Behaviour
Codex CLI does not read a single instruction file. It assembles a composite instruction set from six distinct surfaces, each with its own scope, precedence.
Codex CLI Granular Approval Policies and the Auto-Review Subagent: Autonomous Yet Secure Workflows
Every Codex CLI user eventually confronts the same tension: you want the agent to work autonomously, but you also want to sleep at night. The original.