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    "title": "AtarCMS — a small CMS that AI agents can build, run and read",
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  "markdown": "![](https://atarcms.com/theme-assets/img/atar-violet.svg?v=9278c657afcb)Open source · MIT licence\n\nAtarCMS runs small multilingual sites — a studio, a clinic, a club, a workshop — on one small server. Hand it to your coding agent: it installs the site and builds it from your brief. Then your editors, or their agents, take it from there.\n\n[Copy the agent prompt](https://atarcms.com/#quick-start) [Open GitHub](https://github.com/yanfishel/atarcms)\n\nYour coding agent\n\n```\nClone https://github.com/yanfishel/atarcms.git with --depth 1 into a temporary folder\n(install git first if it is missing), read .agents/skills/building-atarcms-sites/references/install.md\nthere and install AtarCMS: into ./my-site on this computer, or into /var/www/<site> on a server;\nthen open the site's folder and continue with its skill.\n```\n\n-   ### AI-ready, end to end\n\n    A coding agent builds the site with the skill that ships in the project. A browser agent runs the admin from one guide at /admin/ai-guide. Language models read the public site through /llms.txt and a markdown twin of every page.\n\n-   ### Multilingual, right to left included\n\n    Content, menus, search and feeds per language, with linked translations. Hebrew and other right-to-left languages mirror the whole site and the whole admin, not just the text. The admin itself speaks five languages.\n\n-   ### Small and honest\n\n    PHP 8.4 and MariaDB on one small VPS. No build step, no node\\_modules, no compiled cache: it boots from the sources on plain OPcache. One to five trusted editors, MIT licence, your data on your server.\n\nMeasured\n\n## A clean sheet in Lighthouse\n\n-   100 Performance\n-   100 Accessibility\n-   100 Best Practices\n-   100 SEO\n-   3/3 Agentic Browsing\n\nThe default theme of the site skeleton, measured with Lighthouse — including Google's new agentic browsing audit, which checks that AI agents can use a site.\n\n-   ![The dashboard: recent activity, content and translation state at a glance](https://atarcms.com/media/shot/2026/10/3e19aa050d5d582eb3a7ea1723e0d314.png?v=0e15271b)\n    *The dashboard: recent activity, content and translation state at a glance*\n\n-   ![The entry form: tabs per field group, the status and publication date beside the fields](https://atarcms.com/media/shot/2026/10/06cde93c198ffe8391c4bf2d0e8f57f8.png?v=0e15271b)\n    *The entry form: tabs per field group, the status and publication date beside the fields*\n\n-   ![Rich text (CKEditor 5) beside structured fields: address, opening hours, a Google map](https://atarcms.com/media/shot/2026/10/61982d79f7cba4f692149ecbbe4191c9.png?v=0e15271b)\n    *Rich text (CKEditor 5) beside structured fields: address, opening hours, a Google map*\n\n-   ![Sections: the site's menu as a tree, drag to nest, every change audited](https://atarcms.com/media/shot/2026/10/05a5602e8f75fde1a8bc5e83d00c4f42.png?v=0e15271b)\n    *Sections: the site's menu as a tree, drag to nest, every change audited*\n\n-   ![Full right to left: the same admin in Hebrew, mirrored by logical CSS](https://atarcms.com/media/shot/2026/10/e7cdbe2413f2a827ce40c4258d2584a4.png?v=0e15271b)\n    *Full right to left: the same admin in Hebrew, mirrored by logical CSS*\n\n-   ![Site settings, Integrations: verification codes and statistics, each one field](https://atarcms.com/media/shot/2026/10/676080024f340f5ffd65f115c904f111.png?v=0e15271b)\n    *Site settings, Integrations: verification codes and statistics, each one field*\n\nGet going\n\n## Quick start\n\nStart a site with Composer, then fill .env, run the migrations and create the first administrator — install.md in the skeleton covers every path: your computer or a server, with Docker or without, shared hosting. Or open your coding agent in an empty folder and paste the prompt. It asks before it installs packages or changes a server, and you type the secrets yourself.\n\n```\ncomposer create-project yanfishel/atarcms my-site --no-interaction\n```\n\n```\nClone https://github.com/yanfishel/atarcms.git with --depth 1 into a temporary folder\n(install git first if it is missing), read .agents/skills/building-atarcms-sites/references/install.md\nthere and install AtarCMS: into ./my-site on this computer, or into /var/www/<site> on a server;\nthen open the site's folder and continue with its skill.\n```\n\n-   ### [Hello from atarcms.com, built by an agent](https://atarcms.com/news/hello-from-atarcms-com)\n\n    Oct 16, 2026\n\n    The project's own site runs on AtarCMS, and a coding agent built it from the owner's brief with the skill that ships in the skeleton.\n\n-   ### [AtarCMS v0.2.0: demo content that follows your brief](https://atarcms.com/news/atarcms-0-2-0)\n\n    Oct 16, 2026\n\n    Demo content now builds the sections, pages and tags of your brief, a new admin speaks the site's language, and the launch checklist walks you through Google sign-in.\n\n-   ### [AtarCMS v0.1.0: the first public version](https://atarcms.com/news/atarcms-0-1-0)\n\n    Oct 15, 2026\n\n    The core and the site skeleton are public under the MIT licence and on Packagist: composer create-project yanfishel/atarcms starts a site.\n",
  "fullPageMarkdown": "AtarCMS — a small CMS that AI agents can build, run and read                     [Skip to content](https://atarcms.com/#main)\n\n## Accessibility\n\nText\n\nText size\n\n100%\n\n-   Wider spacing\n-   Readable font\n\nColours\n\n-   High contrast\n-   Greyscale\n-   Invert colours\n\nNavigation\n\n-   Highlight links and headings\n-   Strong focus\n-   Big cursor\n-   Stop animations\n\nReading\n\n-   Reading guide\n-   Hide images\n\n[![](https://atarcms.com/theme-assets/img/atar-violet.svg?v=9278c657afcb)AtarCMS](https://atarcms.com/)\n\n[](https://github.com/yanfishel/atarcms \"GitHub\")\n\n****\n\n-   Light\n-   Dark\n-   As on the device\n\n**Menu**\n\n![](https://atarcms.com/theme-assets/img/atar-violet.svg?v=9278c657afcb)Open source · MIT licence\n\n# A small CMS that AI agents can build, run and read\n\nAtarCMS runs small multilingual sites — a studio, a clinic, a club, a workshop — on one small server. Hand it to your coding agent: it installs the site and builds it from your brief. Then your editors, or their agents, take it from there.\n\n[Copy the agent prompt](https://atarcms.com/#quick-start) [Open GitHub](https://github.com/yanfishel/atarcms)\n\nYour coding agent\n\nCopy\n\n```\nClone https://github.com/yanfishel/atarcms.git with --depth 1 into a temporary folder\n(install git first if it is missing), read .agents/skills/building-atarcms-sites/references/install.md\nthere and install AtarCMS: into ./my-site on this computer, or into /var/www/<site> on a server;\nthen open the site's folder and continue with its skill.\n```\n\n## What AtarCMS is\n\n-   ### AI-ready, end to end\n\n    A coding agent builds the site with the skill that ships in the project. A browser agent runs the admin from one guide at /admin/ai-guide. Language models read the public site through /llms.txt and a markdown twin of every page.\n\n-   ### Multilingual, right to left included\n\n    Content, menus, search and feeds per language, with linked translations. Hebrew and other right-to-left languages mirror the whole site and the whole admin, not just the text. The admin itself speaks five languages.\n\n-   ### Small and honest\n\n    PHP 8.4 and MariaDB on one small VPS. No build step, no node\\_modules, no compiled cache: it boots from the sources on plain OPcache. One to five trusted editors, MIT licence, your data on your server.\n\nMeasured\n\n## A clean sheet in Lighthouse\n\n-   100 Performance\n-   100 Accessibility\n-   100 Best Practices\n-   100 SEO\n-   3/3 Agentic Browsing\n\nThe default theme of the site skeleton, measured with Lighthouse — including Google's new agentic browsing audit, which checks that AI agents can use a site.\n\nScreenshots\n\n## A look inside the admin\n\nReal screenshots, no mock-ups. Select one to see it full size.\n\n-   ![The dashboard: recent activity, content and translation state at a glance](https://atarcms.com/media/shot/2026/10/3e19aa050d5d582eb3a7ea1723e0d314.png?v=0e15271b)\n    *The dashboard: recent activity, content and translation state at a glance*\n\n-   ![The entry form: tabs per field group, the status and publication date beside the fields](https://atarcms.com/media/shot/2026/10/06cde93c198ffe8391c4bf2d0e8f57f8.png?v=0e15271b)\n    *The entry form: tabs per field group, the status and publication date beside the fields*\n\n-   ![Rich text (CKEditor 5) beside structured fields: address, opening hours, a Google map](https://atarcms.com/media/shot/2026/10/61982d79f7cba4f692149ecbbe4191c9.png?v=0e15271b)\n    *Rich text (CKEditor 5) beside structured fields: address, opening hours, a Google map*\n\n-   ![Sections: the site's menu as a tree, drag to nest, every change audited](https://atarcms.com/media/shot/2026/10/05a5602e8f75fde1a8bc5e83d00c4f42.png?v=0e15271b)\n    *Sections: the site's menu as a tree, drag to nest, every change audited*\n\n-   ![Full right to left: the same admin in Hebrew, mirrored by logical CSS](https://atarcms.com/media/shot/2026/10/e7cdbe2413f2a827ce40c4258d2584a4.png?v=0e15271b)\n    *Full right to left: the same admin in Hebrew, mirrored by logical CSS*\n\n-   ![Site settings, Integrations: verification codes and statistics, each one field](https://atarcms.com/media/shot/2026/10/676080024f340f5ffd65f115c904f111.png?v=0e15271b)\n    *Site settings, Integrations: verification codes and statistics, each one field*\n\nGet going\n\n## Quick start\n\nStart a site with Composer, then fill .env, run the migrations and create the first administrator — install.md in the skeleton covers every path: your computer or a server, with Docker or without, shared hosting. Or open your coding agent in an empty folder and paste the prompt. It asks before it installs packages or changes a server, and you type the secrets yourself.\n\n### Install with ComposerCopy\n\n```\ncomposer create-project yanfishel/atarcms my-site --no-interaction\n```\n\n### Or hand it to your coding agentCopy\n\n```\nClone https://github.com/yanfishel/atarcms.git with --depth 1 into a temporary folder\n(install git first if it is missing), read .agents/skills/building-atarcms-sites/references/install.md\nthere and install AtarCMS: into ./my-site on this computer, or into /var/www/<site> on a server;\nthen open the site's folder and continue with its skill.\n```\n\nUpdates\n\n## Latest news\n\n[All news](https://atarcms.com/news)\n\n-   ### [Hello from atarcms.com, built by an agent](https://atarcms.com/news/hello-from-atarcms-com)\n\n    Oct 16, 2026\n\n    The project's own site runs on AtarCMS, and a coding agent built it from the owner's brief with the skill that ships in the skeleton.\n\n    -   [#Project](https://atarcms.com/tag/project)\n\n-   ### [AtarCMS v0.2.0: demo content that follows your brief](https://atarcms.com/news/atarcms-0-2-0)\n\n    Oct 16, 2026\n\n    Demo content now builds the sections, pages and tags of your brief, a new admin speaks the site's language, and the launch checklist walks you through Google sign-in.\n\n    -   [#Releases](https://atarcms.com/tag/releases)\n\n-   ### [AtarCMS v0.1.0: the first public version](https://atarcms.com/news/atarcms-0-1-0)\n\n    Oct 15, 2026\n\n    The core and the site skeleton are public under the MIT licence and on Packagist: composer create-project yanfishel/atarcms starts a site.\n\n    -   [#Releases](https://atarcms.com/tag/releases)\n",
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  "llmsTxtPreview": "# AtarCMS\n\n> AtarCMS is an open-source PHP CMS for small multilingual sites, built so that AI agents can install it, run its admin and read the published site. MIT licence, one small VPS, no build step.\n\n## Documentation\n- [FAQ](https://atarcms.com/faq)\n- [llms.txt](https://atarcms.com/llms.txt)\n- [llms-full.txt](https://atarcms.com/llms-full.txt)\n\n## Main\n- [AtarCMS — a small CMS that AI agents can build, run and read](https://atarcms.com): AtarCMS is an open-source PHP CMS for small multilingual sites, built so that AI agents can install it, run its admin a…\n- [Accessibility statement](https://atarcms.com/accessibility)\n- [AtarCMS](https://atarcms.com/)\n- [How it works](https://atarcms.com/how-it-works)\n- [AI-ready](https://atarcms.com/ai-ready)\n- [Contacts](https://atarcms.com/contacts)\n- [llms.txt](https://atarcms.com/llms.txt)\n- [llms-full.txt](https://atarcms.com/llms-full.txt)\n- [Sitemap](https://atarcms.com/sitemap.xml)\n\n## Blog\n- [News](https://atarcms.com/news)\n- [News feed (RSS)](https://atarcms.com/news/feed.xml)\n\n## Legal\n- [Privacy policy](https://atarcms.com/privacy)\n\n## Support\n- [FAQ](https://atarcms.com/faq)\n\n",
  "llmsTxtExisting": "# AtarCMS\n\n> AtarCMS is an open-source PHP CMS for small multilingual sites, built so that AI agents can install it, run its admin and read the published site. MIT licence, one small VPS, no build step.\n\nSite languages: en (default)\n\nAppend .md to an entry's URL for a markdown version.\n\nThe full text of the entry pages: https://atarcms.com/llms-full.txt\n\n## Home page\n\n- [Home page](https://atarcms.com/)\n\n## Contacts\n\n- [Contacts](https://atarcms.com/contacts)\n\n## News\n\n- [AtarCMS v0.2.0: demo content that follows your brief](https://atarcms.com/news/atarcms-0-2-0)\n- [AtarCMS v0.1.0: the first public version](https://atarcms.com/news/atarcms-0-1-0)\n- [Hello from atarcms.com, built by an agent](https://atarcms.com/news/hello-from-atarcms-com)\n\n## FAQ\n\n- [CKEditor is GPL: does that affect my site?](https://atarcms.com/faq/ckeditor-and-gpl)\n- [Where is my data?](https://atarcms.com/faq/where-is-my-data)\n- [What hosting do I need?](https://atarcms.com/faq/what-hosting-do-i-need)\n- [What does it cost?](https://atarcms.com/faq/what-does-it-cost)\n- [What exactly can an AI agent do in the admin?](https://atarcms.com/faq/what-can-an-ai-agent-do-in-the-admin)\n- [How is this different from WordPress?](https://atarcms.com/faq/how-is-this-different-from-wordpress)\n- [Do I need a programmer?](https://atarcms.com/faq/do-i-need-a-programmer)\n\n## Pages\n\n- [Privacy policy](https://atarcms.com/privacy)\n- [Accessibility statement](https://atarcms.com/accessibility)\n- [How it works](https://atarcms.com/how-it-works)\n- [AI-ready](https://atarcms.com/ai-ready)\n\n## Tags\n\n- [Project](https://atarcms.com/tag/project)\n- [Releases](https://atarcms.com/tag/releases)",
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    "refusedAsBot": false,
    "edge": null,
    "verifiable": false,
    "detail": "This origin answers OAI-SearchBot exactly as it answers any other client (200). No edge-level filtering of AI crawlers observed."
  },
  "snippets": [
    {
      "id": "add_content_signals",
      "title": "Add Content-Signal directives",
      "description": "Content-Signal tells AI agents how they may use your content. The canonical location is robots.txt, but you can also expose it as an HTTP header from any stack.",
      "language": "txt",
      "code": "User-agent: *\nContent-Signal: search=yes, ai-input=yes, ai-train=no",
      "filename": "/robots.txt",
      "stacks": [
        {
          "id": "robots",
          "label": "robots.txt",
          "language": "txt",
          "filename": "/robots.txt",
          "code": "User-agent: *\nContent-Signal: search=yes, ai-input=yes, ai-train=no"
        },
        {
          "id": "nginx",
          "label": "Nginx",
          "language": "nginx",
          "filename": "server block",
          "code": "# Inside your server { } block:\nadd_header Content-Signal \"search=yes, ai-input=yes, ai-train=no\" always;"
        },
        {
          "id": "apache",
          "label": "Apache",
          "language": "apache",
          "filename": ".htaccess",
          "code": "# In .htaccess (or VirtualHost):\nHeader set Content-Signal \"search=yes, ai-input=yes, ai-train=no\""
        },
        {
          "id": "wordpress",
          "label": "WordPress",
          "language": "php",
          "filename": "functions.php",
          "code": "<?php\n// In your theme's functions.php or a small mu-plugin\nadd_action('send_headers', function () {\n    header('Content-Signal: search=yes, ai-input=yes, ai-train=no');\n});\n\n// Optional: also append the directive to the dynamic robots.txt\nadd_filter('robots_txt', function ($output) {\n    return $output . \"\\nContent-Signal: search=yes, ai-input=yes, ai-train=no\\n\";\n}, 10, 1);"
        },
        {
          "id": "nextjs",
          "label": "Next.js",
          "language": "typescript",
          "filename": "middleware.ts",
          "code": "// middleware.ts (Next.js 13+ App Router or Pages Router)\nimport { NextResponse } from 'next/server';\nexport function middleware() {\n  const res = NextResponse.next();\n  res.headers.set(\n    'Content-Signal',\n    'search=yes, ai-input=yes, ai-train=no'\n  );\n  return res;\n}\nexport const config = { matcher: '/:path*' };"
        },
        {
          "id": "cloudflare",
          "label": "Cloudflare Workers",
          "language": "javascript",
          "filename": "worker.js",
          "code": "// Cloudflare Worker that proxies your origin and adds the header\nexport default {\n  async fetch(request, env, ctx) {\n    const res = await fetch(request);\n    const newRes = new Response(res.body, res);\n    newRes.headers.set(\n      'Content-Signal',\n      'search=yes, ai-input=yes, ai-train=no'\n    );\n    return newRes;\n  },\n};"
        },
        {
          "id": "express",
          "label": "Express / Fastify",
          "language": "javascript",
          "filename": "server.js",
          "code": "// Express\napp.use((req, res, next) => {\n  res.setHeader('Content-Signal', 'search=yes, ai-input=yes, ai-train=no');\n  next();\n});\n\n// Fastify\nfastify.addHook('onSend', (request, reply, payload, done) => {\n  reply.header('Content-Signal', 'search=yes, ai-input=yes, ai-train=no');\n  done();\n});"
        }
      ]
    }
  ]
}

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