{"id":62023,"date":"2026-03-13T17:01:22","date_gmt":"2026-03-13T14:01:22","guid":{"rendered":"https:\/\/saudishopper.com.sa\/en\/claude-generative-ui-reverse-engineered\/"},"modified":"2026-05-12T17:44:08","modified_gmt":"2026-05-12T14:44:08","slug":"claude-generative-ui-reverse-engineered","status":"publish","type":"post","link":"https:\/\/saudishopper.com.sa\/en\/claude-generative-ui-reverse-engineered\/","title":{"rendered":"Developer Reverse-Engineers Claude Generative UI and Builds Open-Source Terminal Implementation"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Claude generative UI, Anthropic&#8217;s newly launched feature for rendering interactive widgets inside chat conversations, has been reverse-engineered by developer Michael Livs, who subsequently built an open-source implementation for terminal-based coding agents.<\/p><p class=\"wp-block-paragraph\">Livs documented the full technical investigation on his blog. The work covers how Anthropic implemented the feature, how the streaming architecture functions, and how he replicated the behavior outside a browser environment.<\/p><h2 class=\"wp-block-heading\">How Claude Generative UI Works Under the Hood<\/h2><p class=\"wp-block-paragraph\">The feature does not render HTML as part of Claude&#8217;s markdown output. Instead, Claude calls an internal tool named <code>show_widget<\/code>, passing raw HTML as a parameter payload. The tool accepts four fields: a boolean flag (<code>i_have_seen_read_me<\/code>), a snake_case title, 1\u20134 loading messages, and the widget HTML fragment itself.<\/p><p class=\"wp-block-paragraph\">Before calling <code>show_widget<\/code>, Claude must first call a <code>read_me<\/code> tool that loads design guidelines on demand. The tool accepts a <code>modules<\/code> parameter with values such as <code>interactive<\/code>, <code>chart<\/code>, <code>diagram<\/code>, <code>mockup<\/code>, and <code>art<\/code>. Each module returns a different subset of Anthropic&#8217;s internal design system, keeping the base system prompt lean and loading specialized rules only when needed.<\/p><p class=\"wp-block-paragraph\">Livs also determined that the widgets are not rendered inside iframes. CSS variables resolve correctly, a parent-page function called <code>sendPrompt()<\/code> is accessible to widget code, and the background is transparent \u2014 all indicators of direct DOM injection into the parent document. The security boundary is a Content Security Policy restricting script sources to a small CDN allowlist: cdnjs.cloudflare.com, cdn.jsdelivr.net, unpkg.com, and esm.sh.<\/p><h2 class=\"wp-block-heading\">Differences Between Generative UI and Claude Artifacts<\/h2><p class=\"wp-block-paragraph\">Livs drew a clear distinction between the new visualizer and Claude&#8217;s existing Artifacts feature. Artifacts are persistent deliverables displayed in a side panel with a download button, using a fixed set of pre-bundled libraries. The generative UI visualizer, by contrast, renders inline in the conversation, is ephemeral, and can load any library from the CDN allowlist at runtime.<\/p><p class=\"wp-block-paragraph\">The trigger language also differs. Deliverable-oriented prompts such as &#8220;Build me a calculator&#8221; produce Artifacts, while explanatory prompts such as &#8220;Show me how compound interest works&#8221; produce inline widgets. Moreover, the CDN allowlist exists specifically to support live library fetching \u2014 Chart.js, D3, and Three.js can all be loaded on demand.<\/p><h2 class=\"wp-block-heading\">Building a Terminal Implementation with Glimpse and morphdom<\/h2><p class=\"wp-block-paragraph\">To replicate the experience in a terminal environment, Livs used Glimpse, a native macOS library that opens a WKWebView window in under 50 milliseconds via a small Swift binary with a Node.js wrapper. The library requires no Electron installation and supports bidirectional JSON communication between the WebView and the host process.<\/p><p class=\"wp-block-paragraph\">The extension registers two tools mirroring Claude&#8217;s pattern: <code>visualize_read_me<\/code> for lazy-loading design guidelines, and <code>show_widget<\/code> for opening a native window with the generated HTML. The implementation is built on pi, a terminal-based <a href=\"\/category\/ai\/\">artificial intelligence<\/a> coding agent that normalizes streaming events across providers including Anthropic, OpenAI, and Google.<\/p><p class=\"wp-block-paragraph\">Smooth streaming required several iterations. Replacing the entire document on every token caused full-page flashes. Naive DOM appending failed because browsers auto-close unclosed tags in partial HTML, producing unpredictable tree structures. The final solution uses morphdom, a DOM diffing library, to apply minimal patches on each update and animate only genuinely new nodes with a CSS fade-in effect.<\/p><h2 class=\"wp-block-heading\">Extracted Design Guidelines Reveal Anthropic&#8217;s Internal System<\/h2><p class=\"wp-block-paragraph\">By inspecting network requests in browser developer tools, Livs extracted the complete text of Anthropic&#8217;s design guidelines as returned by the <code>read_me<\/code> tool. The guidelines cover streaming-first HTML structure, a prohibition on gradients and shadows during streaming, a nine-ramp color palette with seven stops each, SVG diagram engineering rules, Chart.js-specific patterns, and UI component tokens for mockups.<\/p><p class=\"wp-block-paragraph\">Livs triggered the <code>read_me<\/code> tool with all five module combinations across multiple sessions. He then wrote a script to parse the responses, split them at heading boundaries, deduplicate shared sections, and verify that recombining the sections produced byte-identical output. The result was 10 unique sections covering all five modules, with four of five producing exact matches and one differing by a single whitespace character.<\/p><p class=\"wp-block-paragraph\">The complete <a href=\"\/category\/apps\/\">open-source extension<\/a> is approximately 350 lines of TypeScript across two files and is available on GitHub under the repository <code>pi-generative-ui<\/code>. The project depends on the glimpseui package and loads morphdom from a CDN at runtime inside the WebView. Furthermore, the extension is auto-discovered by pi on startup with no additional configuration required.<\/p>","protected":false},"excerpt":{"rendered":"<p>Developer Michael Livs reverse-engineered Anthropic&#8217;s Claude generative UI feature, documenting the tool-call architecture, DOM injection method, and internal design guidelines \u2014 then built an open-source terminal implementation.<\/p>\n","protected":false},"author":16,"featured_media":62022,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_pr_autopilot_social_copy":"{\"x_hook\":\"A developer reverse-engineered Claude's new generative UI feature \u2014 and it turns out interactive widgets are just tool calls injecting HTML directly into the DOM, not iframes.\",\"x_takeaways\":\"Key Details:\\n\ud83d\udd39 Claude calls a show_widget tool with raw HTML as a parameter, not markdown output\\n\ud83d\udd39 Widgets use direct DOM injection with a CDN Content Security Policy as the security boundary\\n\ud83d\udd39 The open-source terminal version uses Glimpse WKWebView and morphdom DOM diffing for smooth streaming\"}","_yoast_wpseo_opengraph_title":"","_yoast_wpseo_opengraph_description":"","_yoast_wpseo_opengraph_image":"","_yoast_wpseo_opengraph_image_id":0,"_yoast_wpseo_twitter_title":"","_yoast_wpseo_twitter_description":"","_yoast_wpseo_twitter_image":"","_yoast_wpseo_twitter_image_id":0,"_yoast_wpseo_primary_category":0,"_extra_hide_author_box":"","_extra_featured_post":"","_partner_post_id":83762,"footnotes":""},"categories":[442,449],"tags":[1467,1466,1389,2494,1169],"class_list":["post-62023","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-apps","category-ai","tag-anthropic","tag-claude-ai","tag-developer-tools","tag-generative-ui","tag-open-source-ai","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Claude Generative UI Reverse-Engineered | Saudi Shopper<\/title>\n<meta name=\"description\" content=\"Claude generative UI uses a tool-call architecture with direct DOM injection. 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