#codex

16 items tagged #codex.

BLOG 2026-05-27

Your MCP tools are running in parallel now

Codex CLI 0.134.0 runs MCP tools marked readOnlyHint concurrently by default. The change is small. The pattern it completes — three vendors flipping defaults toward more-automatic-less-consent in the same week — is the news.

Owner · 6 min #opinion #codex

NEWS 2026-05-27

Codex CLI 0.134.0 adds conversation search and concurrent read-only MCP

OpenAI shipped Codex CLI 0.134.0 on May 26. Two headline items: search across local conversation history with previews, and read-only MCP tools that run concurrently when they advertise readOnlyHint. Plus profile-config migration enforcement and richer hook context.

Owner · 2 min #codex #release

GUIDE 2026-05-19

Using Codex mobile without downgrading your review

How to set up Codex in the ChatGPT mobile app and use it for what a phone is good at — monitoring and redirecting — while keeping diff review on a screen you can actually read.

Owner · 4 min #codex #mobile

BLOG 2026-05-19

Supervision from your pocket

OpenAI just made approving an agent's work something you can do from a phone in a checkout line. That is exactly the thing the supervision paradox warned about, now with great UX.

Owner · 6 min #opinion #agents

NEWS 2026-05-19

OpenAI brings Codex to the ChatGPT mobile app

OpenAI put its Codex coding agent inside the ChatGPT mobile app on May 14. The phone pairs to a Mac running Codex and can review diffs, approve commands, and redirect a running task — supervision without the desk.

Owner · 2 min #codex #release

GUIDE 2026-05-18

Writing a SKILL.md that works across Claude Code, Codex, and more

The portable subset of the SKILL.md format, what varies per tool, and a worked example skill that runs unchanged on Claude Code and Codex without single-tool hooks.

Owner · 4 min #skills #codex

NEWS 2026-05-18

Codex pulls skills into the @ menu as SKILL.md spreads across tools

OpenAI's May Codex update surfaces skills in the composer @ menu. The larger development: the SKILL.md format now runs across Claude Code, Codex, Gemini CLI, Copilot, Cursor, and more.

Owner · 2 min #codex #skills

GUIDE 2026-05-11

Codex CLI from zero: installing, authenticating, and the first useful loop

Codex CLI is OpenAI's official AI coding agent for the terminal. This guide covers both install paths, the two auth modes, and the sandboxed shell that makes it safer than it looks by default.

Owner · 6 min #codex #getting-started

GUIDE 2026-05-11

Codex review mode: a second opinion that doesn't agree with you for free

Codex CLI can review a diff or file and return categorized findings before a human ever sees your PR. Here's how to use it, what to trust, and what to ignore.

Owner · 6 min #codex #code-review

GUIDE 2026-05-11

Codex in GitHub Actions: running an autonomous agent on pull requests without losing control

How to install Codex in a GitHub Actions runner, auth safely, scope the agent to one branch, cap per-run costs, and recover when the agent misbehaves.

Owner · 8 min #codex #github-actions

GUIDE 2026-05-11

Codex sandbox mode: what it actually contains and where it leaks

Codex CLI runs every command in a restricted shell by default. Here's what that sandbox actually blocks, how to grant network access when you need it, and what it can't protect you from.

Owner · 7 min #codex #sandbox

GUIDE 2026-05-11

Codex vs Claude Code: same job, different model families — concrete differences

Both run in your terminal, read your codebase, and execute autonomous tasks. What's different is how GPT-family and Claude-family models approach the same problem — and those differences are visible and reproducible.

Owner · 8 min #codex #claude-code

GUIDE 2026-05-11

Codex reasoning effort: how the low/medium/high knob actually changes behavior

Codex's reasoning_effort parameter changes how much the model thinks before responding. Here is how to read the tradeoffs and pick the right level for the task at hand.

Owner · 6 min #codex #reasoning

GUIDE 2026-05-11

Codex's web tool: useful, narrow, and easy to misuse

Codex CLI can fetch URLs and search the web mid-task. Here's when that helps, when it quietly burns tokens, and the workflow pattern that keeps it useful.

Owner · 5 min #codex #web-tool

NEWS 2026-03-10

OpenAI's Codex CLI enters public beta with terminal-first agent workflow

OpenAI launched a CLI agent product. The shape is similar to Claude Code: terminal-based, agentic, with file-system and shell access.

Owner · 4 min #openai #codex

NEWS 2025-12-15

OpenAI's Codex CLI gains MCP support, joins the universal protocol

Codex CLI adds MCP server integration, completing the major-lab adoption of the protocol.

Owner · 2 min #openai #codex