[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"platform-content-codex":3},{"id":4,"title":5,"body":6,"date":749,"description":750,"extension":751,"faqs":752,"image":749,"meta":765,"navigation":767,"path":768,"seo":769,"stem":770,"tags":749,"__hash__":771},"content\u002Fplatforms\u002Fcodex.md","How to Install Skills for OpenAI Codex",{"type":7,"value":8,"toc":734},"minimark",[9,14,23,51,54,92,96,99,120,123,127,134,149,153,161,181,186,214,221,225,318,322,331,338,342,416,420,442,481,485,492,598,602,612,634,642,664,675,686,694,702,705,708,730],[10,11,13],"h2",{"id":12},"install-the-learn-command","Install the \u002Flearn Command",[15,16,17,18,22],"p",{},"The fastest way to add skills to Codex is the ",[19,20,21],"code",{},"\u002Flearn"," command, which connects to {skillCount}+ skills from agentskill.sh:",[24,25,30],"pre",{"className":26,"code":27,"language":28,"meta":29,"style":29},"language-bash shiki shiki-themes github-light github-dark","git clone https:\u002F\u002Fgithub.com\u002Fagentskill-sh\u002Fags.git ~\u002F.codex\u002Fskills\u002Flearn\n","bash","",[19,31,32],{"__ignoreMap":29},[33,34,37,41,45,48],"span",{"class":35,"line":36},"line",1,[33,38,40],{"class":39},"sScJk","git",[33,42,44],{"class":43},"sZZnC"," clone",[33,46,47],{"class":43}," https:\u002F\u002Fgithub.com\u002Fagentskill-sh\u002Fags.git",[33,49,50],{"class":43}," ~\u002F.codex\u002Fskills\u002Flearn\n",[15,52,53],{},"Then in any Codex session:",[24,55,57],{"className":26,"code":56,"language":28,"meta":29,"style":29},"\u002Flearn seo                              # Search for skills\n\u002Flearn @anthropic\u002Fseo-content-optimizer # Install specific skill\n\u002Flearn trending                         # See popular skills\n",[19,58,59,70,81],{"__ignoreMap":29},[33,60,61,63,66],{"class":35,"line":36},[33,62,21],{"class":39},[33,64,65],{"class":43}," seo",[33,67,69],{"class":68},"sJ8bj","                              # Search for skills\n",[33,71,73,75,78],{"class":35,"line":72},2,[33,74,21],{"class":39},[33,76,77],{"class":43}," @anthropic\u002Fseo-content-optimizer",[33,79,80],{"class":68}," # Install specific skill\n",[33,82,84,86,89],{"class":35,"line":83},3,[33,85,21],{"class":39},[33,87,88],{"class":43}," trending",[33,90,91],{"class":68},"                         # See popular skills\n",[10,93,95],{"id":94},"manual-installation","Manual Installation",[15,97,98],{},"If you prefer installing skills individually:",[100,101,102,111,114],"ol",{},[103,104,105,106],"li",{},"Browse skills on ",[107,108,110],"a",{"href":109},"\u002F","agentskill.sh",[103,112,113],{},"Download the skill ZIP",[103,115,116,117],{},"Extract to ",[19,118,119],{},"~\u002F.codex\u002Fskills\u002F[skill-name]\u002F",[15,121,122],{},"Codex auto-discovers skills on startup. No restart needed.",[10,124,126],{"id":125},"using-agentsmd-for-project-skills","Using AGENTS.md for Project Skills",[15,128,129,130,133],{},"For project-specific customization, add an ",[19,131,132],{},"AGENTS.md"," file to your repository root. This tells Codex:",[135,136,137,140,143,146],"ul",{},[103,138,139],{},"How to navigate your codebase",[103,141,142],{},"Which commands to run for testing",[103,144,145],{},"Your project's coding standards",[103,147,148],{},"Preferred patterns and conventions",[10,150,152],{"id":151},"how-codex-uses-skills","How Codex Uses Skills",[15,154,155,156,160],{},"Codex natively supports the ",[157,158,159],"strong",{},"Agent Skills standard",". Skills provide:",[135,162,163,169,175],{},[103,164,165,168],{},[157,166,167],{},"Task-specific workflows",": Code review, testing, deployment, documentation",[103,170,171,174],{},[157,172,173],{},"Domain expertise",": SEO, frontend design, database optimization",[103,176,177,180],{},[157,178,179],{},"Team conventions",": Your coding standards, review processes, testing requirements",[182,183,185],"h3",{"id":184},"skill-invocation-methods","Skill Invocation Methods",[100,187,188,198,204],{},[103,189,190,193,194,197],{},[157,191,192],{},"Explicit",": Type ",[19,195,196],{},"$skill-name"," in your prompt",[103,199,200,203],{},[157,201,202],{},"Implicit",": Describe a task and Codex auto-selects the matching skill",[103,205,206,209,210,213],{},[157,207,208],{},"List skills",": Run ",[19,211,212],{},"\u002Fskills"," to see all available skills",[15,215,216,217,220],{},"Codex uses ",[157,218,219],{},"progressive disclosure",": it loads only skill metadata at startup (~100 tokens each), then fetches full instructions only when a skill is invoked.",[10,222,224],{"id":223},"popular-codex-skills","Popular Codex Skills",[226,227,228,244],"table",{},[229,230,231],"thead",{},[232,233,234,238,241],"tr",{},[235,236,237],"th",{},"Skill",[235,239,240],{},"Description",[235,242,243],{},"Installs",[245,246,247,262,276,290,304],"tbody",{},[232,248,249,256,259],{},[250,251,252],"td",{},[107,253,255],{"href":254},"\u002Fskills\u002Fcode-review","code-review",[250,257,258],{},"Systematic review with security & performance checks",[250,260,261],{},"15K+",[232,263,264,270,273],{},[250,265,266],{},[107,267,269],{"href":268},"\u002Fskills\u002Ftest-runner","test-runner",[250,271,272],{},"Run tests, analyze failures, coverage reports",[250,274,275],{},"12K+",[232,277,278,284,287],{},[250,279,280],{},[107,281,283],{"href":282},"\u002Fcompound-engineering\u002Ffrontend-design","frontend-design",[250,285,286],{},"Production-grade UI components",[250,288,289],{},"8K+",[232,291,292,298,301],{},[250,293,294],{},[107,295,297],{"href":296},"\u002Fanthropic\u002Fseo-optimizer","seo-optimizer",[250,299,300],{},"SEO, keyword research, content optimization",[250,302,303],{},"10K+",[232,305,306,312,315],{},[250,307,308],{},[107,309,311],{"href":310},"\u002Fskills\u002Fprogrammatic-seo","programmatic-seo",[250,313,314],{},"SEO pages at scale",[250,316,317],{},"6K+",[10,319,321],{"id":320},"what-is-openai-codex","What is OpenAI Codex?",[15,323,324,330],{},[107,325,329],{"href":326,"rel":327},"https:\u002F\u002Fopenai.com\u002Fcodex\u002F",[328],"nofollow","Codex"," is OpenAI's AI coding agent that works in your terminal, IDE, and the cloud. It can write features, fix bugs, answer questions about your codebase, and propose pull requests, all running in parallel sandbox environments preloaded with your repository.",[15,332,333,334,337],{},"Codex is powered by ",[157,335,336],{},"GPT-5.3-Codex"," (released February 2026), the most capable agentic coding model to date.",[182,339,341],{"id":340},"where-codex-runs","Where Codex Runs",[226,343,344,354],{},[229,345,346],{},[232,347,348,351],{},[235,349,350],{},"Platform",[235,352,353],{},"How to Access",[245,355,356,372,382,396,406],{},[232,357,358,363],{},[250,359,360],{},[157,361,362],{},"Terminal (CLI)",[250,364,365,368,369],{},[19,366,367],{},"npm i -g @openai\u002Fcodex"," or ",[19,370,371],{},"brew install --cask codex",[232,373,374,379],{},[250,375,376],{},[157,377,378],{},"VS Code \u002F Cursor \u002F Windsurf",[250,380,381],{},"Install the Codex IDE extension",[232,383,384,389],{},[250,385,386],{},[157,387,388],{},"Cloud (Codex App)",[250,390,391],{},[107,392,395],{"href":393,"rel":394},"https:\u002F\u002Fchatgpt.com\u002Fcodex",[328],"chatgpt.com\u002Fcodex",[232,397,398,403],{},[250,399,400],{},[157,401,402],{},"Slack",[250,404,405],{},"@codex mentions for questions and tasks",[232,407,408,413],{},[250,409,410],{},[157,411,412],{},"GitHub",[250,414,415],{},"@codex on PRs and Issues",[182,417,419],{"id":418},"codex-pricing","Codex Pricing",[15,421,422,423,426,427,430,431,430,434,437,438,441],{},"Codex is included with ",[157,424,425],{},"ChatGPT Plus"," ($20\u002Fmonth), ",[157,428,429],{},"Pro",", ",[157,432,433],{},"Business",[157,435,436],{},"Edu",", and ",[157,439,440],{},"Enterprise"," plans. The Codex CLI is open-source and free to install:",[24,443,445],{"className":26,"code":444,"language":28,"meta":29,"style":29},"npm i -g @openai\u002Fcodex\n# or\nbrew install --cask codex\n",[19,446,447,462,467],{"__ignoreMap":29},[33,448,449,452,455,459],{"class":35,"line":36},[33,450,451],{"class":39},"npm",[33,453,454],{"class":43}," i",[33,456,458],{"class":457},"sj4cs"," -g",[33,460,461],{"class":43}," @openai\u002Fcodex\n",[33,463,464],{"class":35,"line":72},[33,465,466],{"class":68},"# or\n",[33,468,469,472,475,478],{"class":35,"line":83},[33,470,471],{"class":39},"brew",[33,473,474],{"class":43}," install",[33,476,477],{"class":457}," --cask",[33,479,480],{"class":43}," codex\n",[182,482,484],{"id":483},"codex-vs-claude-code","Codex vs Claude Code",[15,486,487,488,491],{},"Both are powerful coding agents with different strengths. Both use the same Agent Skills standard, so ",[157,489,490],{},"skills are fully interoperable",".",[226,493,494,506],{},[229,495,496],{},[232,497,498,501,503],{},[235,499,500],{},"Feature",[235,502,329],{},[235,504,505],{},"Claude Code",[245,507,508,521,533,546,559,572,585],{},[232,509,510,515,518],{},[250,511,512],{},[157,513,514],{},"Maker",[250,516,517],{},"OpenAI",[250,519,520],{},"Anthropic",[232,522,523,528,530],{},[250,524,525],{},[157,526,527],{},"Model",[250,529,336],{},[250,531,532],{},"Claude Opus 4.5",[232,534,535,540,543],{},[250,536,537],{},[157,538,539],{},"Cloud execution",[250,541,542],{},"Yes (sandboxed)",[250,544,545],{},"No (local only)",[232,547,548,553,556],{},[250,549,550],{},[157,551,552],{},"GitHub integration",[250,554,555],{},"@codex mentions",[250,557,558],{},"Git CLI",[232,560,561,566,569],{},[250,562,563],{},[157,564,565],{},"Slack integration",[250,567,568],{},"Yes",[250,570,571],{},"No",[232,573,574,579,582],{},[250,575,576],{},[157,577,578],{},"Skills format",[250,580,581],{},"SKILL.md",[250,583,584],{},"SKILL.md (same)",[232,586,587,592,595],{},[250,588,589],{},[157,590,591],{},"Pricing",[250,593,594],{},"ChatGPT Plus ($20\u002Fmo)",[250,596,597],{},"Claude Pro ($20\u002Fmo)",[10,599,601],{"id":600},"faq","FAQ",[603,604,605,609],"details",{},[606,607,608],"summary",{},"Is Codex free?",[15,610,611],{},"The Codex CLI is free and open-source. Full Codex functionality (cloud tasks, parallel execution, GitHub\u002FSlack integration) requires a ChatGPT Plus subscription ($20\u002Fmonth) or higher. You can also use the CLI with any compatible API provider.",[603,613,614,617,620],{},[606,615,616],{},"What's the difference between Codex and ChatGPT?",[15,618,619],{},"ChatGPT is a conversational AI. Codex is an autonomous coding agent built on top of GPT-5.3-Codex, a model specifically optimized for software engineering. Codex can:",[135,621,622,625,628,631],{},[103,623,624],{},"Execute code in sandboxed environments",[103,626,627],{},"Work on multiple tasks in parallel",[103,629,630],{},"Integrate with GitHub and Slack",[103,632,633],{},"Remember project context across sessions",[603,635,636,639],{},[606,637,638],{},"Can I use Codex with Claude or other models?",[15,640,641],{},"Yes. The Codex CLI supports any model provider that implements the Chat Completions or Responses API. You can point Codex at Anthropic Claude, local models via Ollama, or any compatible endpoint.",[603,643,644,647,661],{},[606,645,646],{},"How do Skills differ from Automations?",[135,648,649,655],{},[103,650,651,654],{},[157,652,653],{},"Skills",": Task-specific capabilities you invoke (e.g., \"Review this code\"). They provide structured workflows for specific jobs.",[103,656,657,660],{},[157,658,659],{},"Automations",": Unprompted background work Codex performs autonomously, like issue triage, CI\u002FCD monitoring, and alert handling.",[15,662,663],{},"Skills are reactive (you ask). Automations are proactive (Codex acts on its own).",[603,665,666,669],{},[606,667,668],{},"Can Codex use Claude Code skills?",[15,670,671,672,674],{},"Yes. Both Codex and Claude Code use the same Agent Skills standard (",[19,673,581],{}," format). Skills are fully interoperable. Write once, use everywhere.",[603,676,677,680],{},[606,678,679],{},"How do I customize Codex for my project?",[15,681,682,683,685],{},"Add an ",[19,684,132],{}," file to your repository root. This is like a README for Codex. It tells the agent how to navigate your codebase, which commands to run, and your project's conventions. You can also install skills that match your tech stack.",[603,687,688,691],{},[606,689,690],{},"What is Agent Teams mode?",[15,692,693],{},"Agent Teams (research preview in Opus 4.6) allows multiple Codex instances to work in parallel and coordinate autonomously. One agent might research while another writes code and a third runs tests, all synchronized.",[603,695,696,699],{},[606,697,698],{},"Is Codex secure?",[15,700,701],{},"GPT-5.3-Codex is treated as a high-security capability under OpenAI's Preparedness Framework. Cloud tasks run in isolated sandboxes. For sensitive projects, you can run the CLI locally with your own API keys.",[703,704],"hr",{},[15,706,707],{},"Sources:",[135,709,710,716,723],{},[103,711,712],{},[107,713,715],{"href":326,"rel":714},[328],"OpenAI Codex",[103,717,718],{},[107,719,722],{"href":720,"rel":721},"https:\u002F\u002Fgithub.com\u002Fopenai\u002Fcodex",[328],"Codex CLI on GitHub",[103,724,725],{},[107,726,729],{"href":727,"rel":728},"https:\u002F\u002Fdevelopers.openai.com\u002Fcodex\u002Fskills",[328],"Codex Skills Documentation",[731,732,733],"style",{},"html pre.shiki code .sScJk, html code.shiki .sScJk{--shiki-default:#6F42C1;--shiki-dark:#B392F0}html pre.shiki code .sZZnC, html code.shiki .sZZnC{--shiki-default:#032F62;--shiki-dark:#9ECBFF}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sJ8bj, html code.shiki .sJ8bj{--shiki-default:#6A737D;--shiki-dark:#6A737D}html pre.shiki code .sj4cs, html code.shiki .sj4cs{--shiki-default:#005CC5;--shiki-dark:#79B8FF}",{"title":29,"searchDepth":72,"depth":72,"links":735},[736,737,738,739,742,743,748],{"id":12,"depth":72,"text":13},{"id":94,"depth":72,"text":95},{"id":125,"depth":72,"text":126},{"id":151,"depth":72,"text":152,"children":740},[741],{"id":184,"depth":83,"text":185},{"id":223,"depth":72,"text":224},{"id":320,"depth":72,"text":321,"children":744},[745,746,747],{"id":340,"depth":83,"text":341},{"id":418,"depth":83,"text":419},{"id":483,"depth":83,"text":484},{"id":600,"depth":72,"text":601},null,"Learn how to install and use {skillCount}+ skills for OpenAI Codex. Step-by-step guide with installation commands, skill invocation, and tips for terminal, IDE, and cloud.","md",[753,754,756,757,759,761,763,764],{"question":608,"answer":611},{"question":616,"answer":755},"ChatGPT is a conversational AI. Codex is an autonomous coding agent built on top of GPT-5.3-Codex, a model specifically optimized for software engineering. Codex can execute code in sandboxed environments, work on multiple tasks in parallel, integrate with GitHub and Slack, and remember project context across sessions.",{"question":638,"answer":641},{"question":646,"answer":758},"Skills are task-specific capabilities you invoke (e.g., 'Review this code'). They provide structured workflows for specific jobs. Automations are unprompted background work Codex performs autonomously, like issue triage, CI\u002FCD monitoring, and alert handling. Skills are reactive (you ask). Automations are proactive (Codex acts on its own).",{"question":668,"answer":760},"Yes. Both Codex and Claude Code use the same Agent Skills standard (SKILL.md format). Skills are fully interoperable. Write once, use everywhere.",{"question":679,"answer":762},"Add an AGENTS.md file to your repository root. This is like a README for Codex. It tells the agent how to navigate your codebase, which commands to run, and your project's conventions. You can also install skills that match your tech stack.",{"question":690,"answer":693},{"question":698,"answer":701},{"heroTagline":766},"OpenAI's AI coding agent — extend it with {skillCount} skills for development, testing, and deployment",true,"\u002Fplatforms\u002Fcodex",{"title":5,"description":750},"platforms\u002Fcodex","91ZLvXCPfwJ7cxOwHDnfvYR-1vagIuArHC3CNljBNzk"]