diff --git a/.changeset/design-reference-to-html-skill.md b/.changeset/design-reference-to-html-skill.md
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+++ b/.changeset/design-reference-to-html-skill.md
@@ -0,0 +1,5 @@
+---
+"@open-codesign/desktop": minor
+---
+
+Add the built-in `design-reference-to-html` method skill for screenshot/mockup-to-HTML recreation. The skill is an Open CoDesign-native rewrite that uses workspace files, `App.jsx`, `DESIGN.md`, `preview()`, and optional `gen_image()` instead of vendoring external skill directories or browser scripts.
diff --git a/apps/desktop/resources/templates/skills/design-reference-to-html.md b/apps/desktop/resources/templates/skills/design-reference-to-html.md
new file mode 100644
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@@ -0,0 +1,203 @@
+---
+schemaVersion: 1
+name: design-reference-to-html
+description: >
+  Recreates an existing visual reference, such as a UI screenshot, mockup export,
+  Figma frame image, dashboard, SaaS screen, empty state, or landing-page capture,
+  as high-quality HTML/CSS or App.jsx. Use only when the user provides a concrete
+  visual reference, not for text-only page design.
+aliases: [design-to-html, screenshot-to-html, visual-reference, screenshot-recreate]
+dependencies: [responsive-layout]
+validationHints:
+  - visual reference is mapped before code is written
+  - complex brand or illustration assets are treated as assets, not improvised CSS
+  - preview screenshots are compared against the reference before done
+trigger:
+  providers: ['*']
+  scope: system
+disable_model_invocation: false
+user_invocable: true
+---
+
+## Design Reference Recreation
+
+Use this workflow when the user asks to recreate, copy, convert, or implement a
+visible design reference as HTML/CSS, `App.jsx`, or a local web artifact.
+
+Do not use it for ordinary product design from prose. If there is no screenshot,
+mockup, exported frame, or equivalent visual artifact, use normal frontend
+design judgment instead.
+
+## Core Contract
+
+Do not jump straight from image to code.
+
+Work as an error-reduction loop:
+
+1. Inspect the visual reference and build a compact page map.
+2. Separate code-rendered UI from external visual assets.
+3. Decide the reference canvas, target viewport, and scaling strategy.
+4. Implement structure first, then visual polish.
+5. Run `preview(path)` and inspect the rendered result.
+6. Compare the preview screenshot against the reference by region.
+7. Correct concrete visual differences and preview again before `done(path)`.
+
+## Inputs To Establish
+
+Infer these from the prompt, attachments, workspace files, and `inspect_workspace`
+when possible. Ask only when missing information would change the output format
+or fidelity target.
+
+- Visual reference: screenshot, mockup export, frame image, browser capture, or
+  local reference asset.
+- Output surface: default to `App.jsx` in an Open CoDesign workspace; use
+  standalone `.html` only when requested or when editing an existing HTML file.
+- Reference canvas: preserve the image aspect ratio when dimensions are known.
+- Verification viewport: match the reference size when practical, then also
+  check the user-facing viewport if different.
+- Asset availability: logos, illustrations, product screenshots, device renders,
+  photos, icon sets, or only the flat reference image.
+- Responsive scope: desktop-only unless the user requests mobile/tablet or the
+  existing artifact clearly needs breakpoints.
+
+## Page Map Before Code
+
+Before writing source, make a short implementation map:
+
+- Overall regions: header, sidebar, hero, content grid, panels, footer, overlays.
+- Layout ratios: column widths, row heights, primary alignment, visible margins.
+- Component inventory: visible UI pieces in top-to-bottom, left-to-right order.
+- Color and surfaces: background, cards, borders, shadows, accent colors.
+- Typography: heading/body/helper sizes, weights, line-height, casing.
+- Shape and density: radius scale, padding rhythm, gaps, shadow softness.
+- Asset candidates: logos, photos, screenshots, illustrations, 3D objects,
+  detailed empty-state art, or brand key visuals.
+
+Keep the map concise. It is a checklist for implementation, not a long critique.
+
+## Asset Separation
+
+Render with HTML/CSS:
+
+- Navigation, sidebars, tabs, menus, cards, panels, forms, tables, buttons,
+  labels, badges, dividers, text, simple charts, and simple icons from an
+  existing icon library.
+
+Treat as assets:
+
+- Brand logos and marks.
+- Detailed illustrations, hero art, 3D renders, people photos, textures.
+- Product screenshots, app mockups, detailed empty-state images.
+- Any shape where exact brand detail matters more than layout structure.
+
+If removing an element leaves the UI skeleton intact, it is probably an asset.
+If removing it breaks the page structure, it is probably code-rendered UI.
+
+Do not hand-draw logos or complex illustrations with ad hoc CSS/SVG. Prefer, in
+order:
+
+1. Existing user-supplied assets in the workspace.
+2. A cropped asset from the reference, when available and clear enough.
+3. A stable neutral placeholder that preserves layout.
+4. `gen_image(prompt, path)` only when the user asked for generated/redrawn
+   bitmap assets and the current provider supports it.
+
+Report placeholders and low-quality crops in the final summary.
+
+## Canvas And Fit
+
+For screenshot recreation, distinguish:
+
+- Reference canvas: the design image/artboard being copied.
+- Display viewport: the browser or preview size used to inspect the result.
+
+Standalone visual reproductions should preserve the reference aspect ratio.
+Use an outer shell plus a stable stage rather than scattering viewport math
+through every element:
+
+```css
+html,
+body {
+  width: 100%;
+  height: 100%;
+  margin: 0;
+}
+
+.preview-shell {
+  min-height: 100vh;
+  display: grid;
+  place-items: center;
+  overflow: hidden;
+  background: var(--page-bg);
+}
+
+.design-stage {
+  width: min(100vw, calc(100vh * var(--reference-ratio)));
+  max-height: 100vh;
+  aspect-ratio: var(--reference-ratio);
+  position: relative;
+  overflow: hidden;
+}
+```
+
+Define `--page-bg` and `--reference-ratio` in the artifact stylesheet before
+using this pattern. For a 1440 by 900 reference, `--reference-ratio` is
+`1440 / 900`.
+
+Use a normal responsive layout for production app screens, but still preserve
+the reference proportions at the target breakpoint before adding other
+breakpoints.
+
+Avoid direct `transform: scale(...)` on a centered fixed canvas unless a parent
+frame also reserves the scaled layout size. Otherwise the visual canvas and the
+layout box disagree, which causes clipped edges or large empty bands.
+
+## Build Rules
+
+- Match proportions and alignment before tuning shadows or gradients.
+- Use CSS variables for repeated colors, spacing, typography, radius, and
+  shadows; update `DESIGN.md` when the reference establishes a reusable system.
+- Use explicit dimensions, `aspect-ratio`, grid tracks, `object-fit`, and
+  min/max constraints for repeated units and asset slots.
+- Keep text content faithful to the reference. Do not add visible explanatory
+  labels unless the reference shows them.
+- Prefer local assets and app-provided libraries. Do not install packages,
+  download images, or add external hotlinks without user approval.
+- Use the repo's existing framework and source entry. In Open CoDesign, default
+  to `App.jsx`; reserve `index.html` for standalone exports or existing HTML
+  workspaces.
+
+## Preview And Compare
+
+Always run `preview(path)` before `done(path)` when the preview tool is
+available. Inspect:
+
+- Canvas fit: no unintended crop, squeeze, overflow, or corner anchoring.
+- Region layout: header, sidebar, main content, repeated cards, footer.
+- Typography: hierarchy, wrapping, weight, line-height, and text color.
+- Surfaces: background hue, card contrast, border opacity, radius, shadows.
+- Assets: size, crop, aspect ratio, resolution, and style match.
+- Density: gaps, padding, vertical rhythm, and whether the page feels too empty
+  or too cramped.
+- Responsive behavior when mobile/tablet is in scope.
+
+Convert vague visual mismatch into actionable edits:
+
+- "Hero starts about 24px too low."
+- "Cards need 8px less vertical padding."
+- "The sidebar is too wide relative to the reference."
+- "The product screenshot slot should use `object-fit: contain`, not stretch."
+
+Iterate with focused edits, preview again, then stop when remaining differences
+are minor, blocked by missing assets, or outside the requested scope.
+
+## Delivery
+
+When calling `done(path)` and summarizing for the user, include:
+
+- What file or artifact was implemented.
+- Which reference and viewport were checked.
+- Which assets were used, cropped, generated, or represented by placeholders.
+- Remaining visual gaps or unverified assumptions.
+
+Do not claim pixel-perfect fidelity unless preview comparison supports it.
diff --git a/packages/core/src/skills/loader.test.ts b/packages/core/src/skills/loader.test.ts
index 7663b92c..123679cc 100644
--- a/packages/core/src/skills/loader.test.ts
+++ b/packages/core/src/skills/loader.test.ts
@@ -67,6 +67,7 @@ describe('loadSkillsFromDir()', () => {
     expect(ids).toContain('app-shell-navigation');
     expect(ids).toContain('accessibility-states');
     expect(ids).toContain('design-system-baton');
+    expect(ids).toContain('design-reference-to-html');
     expect(ids).toContain('responsive-layout');
     expect(ids).toContain('data-viz-recharts');
     expect(ids).toContain('mobile-mock');