diff --git a/plots/bar-stacked-labeled/implementations/javascript/muix.tsx b/plots/bar-stacked-labeled/implementations/javascript/muix.tsx
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+++ b/plots/bar-stacked-labeled/implementations/javascript/muix.tsx
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+// anyplot.ai
+// bar-stacked-labeled: Stacked Bar Chart with Total Labels
+// Library: muix 7.29.1 | JavaScript 22.23.2
+// Quality: 88/100 | Created: 2026-08-26
+import { BarChart } from "@mui/x-charts/BarChart";
+import { useXScale, useYScale } from "@mui/x-charts/hooks";
+import Box from "@mui/material/Box";
+import Typography from "@mui/material/Typography";
+
+const t = window.ANYPLOT_TOKENS;
+
+// --- Data (in-memory, deterministic) ----------------------------------------
+// Project budget breakdown by phase, three stacked cost types (Imprint palette 1-3).
+const phases = ["Planning", "Design", "Development", "Testing", "Deployment"];
+const costTypes = ["Labor", "Materials", "Equipment"];
+const labor = [18, 32, 58, 34, 22];
+const materials = [6, 14, 20, 10, 8];
+const equipment = [4, 10, 16, 6, 12];
+const totals = phases.map((_, i) => labor[i] + materials[i] + equipment[i]);
+const maxTotal = Math.max(...totals);
+
+const TITLE = "bar-stacked-labeled · javascript · muix · anyplot.ai";
+const TITLE_H = 56;
+
+// --- Total labels (custom overlay, positioned via chart scales) -------------
+function TotalLabels() {
+  const xScale = useXScale();
+  const yScale = useYScale();
+  return (
+    <g>
+      {phases.map((phase, i) => (
+        <text
+          key={phase}
+          x={xScale(phase) + xScale.bandwidth() / 2}
+          y={yScale(totals[i]) - 16}
+          textAnchor="middle"
+          fontSize={20}
+          fontWeight={700}
+          fill={t.ink}
+        >
+          {`$${totals[i]}k`}
+        </text>
+      ))}
+    </g>
+  );
+}
+
+// --- Chart (default-exported component — the harness mounts it) -------------
+export default function Chart() {
+  const { width, height } = window.ANYPLOT_SIZE;
+
+  return (
+    <Box
+      sx={{
+        width,
+        height,
+        bgcolor: t.pageBg,
+        display: "flex",
+        flexDirection: "column",
+      }}
+    >
+      <Box
+        sx={{
+          height: TITLE_H,
+          display: "flex",
+          alignItems: "center",
+          px: "40px",
+          pt: "10px",
+        }}
+      >
+        <Typography
+          sx={{
+            color: t.ink,
+            fontSize: "22px",
+            fontWeight: 600,
+            letterSpacing: "0.02em",
+            lineHeight: 1,
+          }}
+        >
+          {TITLE}
+        </Typography>
+      </Box>
+
+      <BarChart
+        width={width}
+        height={height - TITLE_H}
+        colors={t.palette}
+        skipAnimation
+        borderRadius={4}
+        grid={{ horizontal: true }}
+        xAxis={[
+          {
+            scaleType: "band",
+            data: phases,
+            label: "Project Phase",
+          },
+        ]}
+        yAxis={[
+          {
+            label: "Cost ($ thousands)",
+            max: Math.ceil((maxTotal * 1.18) / 10) * 10,
+            tickFontSize: 14,
+            labelFontSize: 16,
+            tickSize: 8,
+          },
+        ]}
+        series={[
+          { data: labor, label: costTypes[0], stack: "total" },
+          { data: materials, label: costTypes[1], stack: "total" },
+          { data: equipment, label: costTypes[2], stack: "total" },
+        ]}
+        margin={{ top: 30, right: 32, bottom: 90, left: 90 }}
+        sx={{
+          "& .MuiChartsAxis-tickLabel": { fontSize: "14px" },
+          "& .MuiChartsAxis-label": { fontSize: "16px", fontWeight: 600 },
+          "& .MuiChartsLegend-label": { fontSize: "15px" },
+          "& .MuiChartsGrid-line": { stroke: t.grid, strokeWidth: 1 },
+          "& .MuiBarElement-root": { stroke: t.pageBg, strokeWidth: 1.5 },
+        }}
+        slotProps={{
+          legend: { position: { vertical: "bottom", horizontal: "middle" } },
+        }}
+      >
+        <TotalLabels />
+      </BarChart>
+    </Box>
+  );
+}
diff --git a/plots/bar-stacked-labeled/metadata/javascript/muix.yaml b/plots/bar-stacked-labeled/metadata/javascript/muix.yaml
new file mode 100644
index 0000000000..8b679cb131
--- /dev/null
+++ b/plots/bar-stacked-labeled/metadata/javascript/muix.yaml
@@ -0,0 +1,244 @@
+library: muix
+language: javascript
+specification_id: bar-stacked-labeled
+created: '2026-08-26T19:14:45Z'
+updated: '2026-08-26T19:28:32Z'
+generated_by: claude-sonnet
+workflow_run: 33003514982
+issue: 3504
+language_version: 22.23.2
+library_version: 7.29.1
+preview_url_light: https://storage.googleapis.com/anyplot-images/plots/bar-stacked-labeled/javascript/muix/plot-light.png
+preview_url_dark: https://storage.googleapis.com/anyplot-images/plots/bar-stacked-labeled/javascript/muix/plot-dark.png
+preview_html_light: https://storage.googleapis.com/anyplot-images/plots/bar-stacked-labeled/javascript/muix/plot-light.html
+preview_html_dark: https://storage.googleapis.com/anyplot-images/plots/bar-stacked-labeled/javascript/muix/plot-dark.html
+quality_score: 88
+review:
+  strengths:
+  - Correct use of MUI X's useXScale/useYScale hooks to render dynamic, scale-accurate
+    total labels above each stack — an idiomatic, distinctive solution to the spec's
+    core requirement.
+  - Repair pass added a subtle 1.5px pageBg-colored edge stroke and 4px border radius
+    to bar segments, giving clearer segment definition without breaking the Imprint
+    palette.
+  - Imprint palette applied correctly and identically across both themes (green →
+    lavender → blue canonical order), with fully theme-adaptive chrome (title, axes,
+    legend, total labels all flip correctly).
+  - Y-axis max computed with deliberate headroom (Math.ceil((maxTotal * 1.18) / 10)
+    * 10) specifically to leave room for total labels — directly satisfies the spec's
+    headroom note.
+  - Deterministic hardcoded data, skipAnimation set, clean imports — no extraneous
+    dependencies or fake functionality.
+  weaknesses:
+  - Design still reads close to a well-configured MUI X BarChart default beyond the
+    total-label overlay and the new edge/border-radius touches — no differentiating
+    typographic treatment, accent, or additional polish.
+  - No further visual hierarchy within each stack (e.g. optional per-segment value
+    labels for the dominant Labor segment) to reinforce the data story beyond the
+    total labels.
+  - Element visibility is good but unremarkable — bar widths and segment proportions
+    rely on library defaults rather than a deliberately tuned density-aware sizing.
+  image_description: |-
+    Light render (plot-light.png):
+      Background: Warm off-white, matches #FAF8F1 — not pure white.
+      Chrome: Bold dark title "bar-stacked-labeled · javascript · muix · anyplot.ai" top-left, clearly readable. Y-axis label "Cost ($ thousands)" and X-axis label "Project Phase" both dark, legible, and similarly sized/weighted (bolded in this attempt). Tick labels dark and legible. Horizontal gridlines subtle and light. Legend ("Labor", "Materials", "Equipment") centered below the plot, dark text, readable.
+      Data: Stacks use brand green (Labor, #009E73), lavender (Materials), and blue (Equipment) — canonical Imprint order, first series is #009E73 as required. Bars now show a thin cream-colored (pageBg) edge stroke and slight border radius separating segments, and each bar. Bold black total labels ("$28k", "$56k", "$94k", "$50k", "$42k") sit directly above each stack with clear headroom below the y=120 axis max.
+      Legibility verdict: PASS
+
+    Dark render (plot-dark.png):
+      Background: Warm near-black, matches #1A1A17 — not pure black.
+      Chrome: Title, axis labels, and tick labels flip to white/light text and remain clearly legible — no dark-on-dark issues anywhere. Legend text is white and readable. Gridlines remain subtle.
+      Data: Colors (green/lavender/blue) are pixel-identical to the light render, confirming only chrome flipped. The bar edge stroke now reads as a thin near-black (pageBg) separator between segments, consistent with the theme. Total labels flip to white text, clearly readable above each stack.
+      Legibility verdict: PASS
+  criteria_checklist:
+    visual_quality:
+      score: 28
+      max: 30
+      items:
+      - id: VQ-01
+        name: Text Legibility
+        score: 7
+        max: 8
+        passed: true
+        comment: All font sizes explicitly set, readable in both themes; title fits
+          without clipping
+      - id: VQ-02
+        name: No Overlap
+        score: 6
+        max: 6
+        passed: true
+        comment: No collisions between text, data, or legend
+      - id: VQ-03
+        name: Element Visibility
+        score: 5
+        max: 6
+        passed: true
+        comment: Bars clearly visible with new edge stroke + border radius, but sizing
+          still relies on library defaults
+      - id: VQ-04
+        name: Color Accessibility
+        score: 2
+        max: 2
+        passed: true
+        comment: Good contrast, CVD-safe; edge strokes aid segment distinction beyond
+          hue alone
+      - id: VQ-05
+        name: Layout & Canvas
+        score: 4
+        max: 4
+        passed: true
+        comment: Chart fills the canvas well, balanced margins, nothing cut off
+      - id: VQ-06
+        name: Axis Labels & Title
+        score: 2
+        max: 2
+        passed: true
+        comment: Descriptive axis labels with units (Cost ($ thousands))
+      - id: VQ-07
+        name: Palette Compliance
+        score: 2
+        max: 2
+        passed: true
+        comment: 'Canonical Imprint order, first series #009E73, theme-correct chrome
+          in both renders'
+    design_excellence:
+      score: 12
+      max: 20
+      items:
+      - id: DE-01
+        name: Aesthetic Sophistication
+        score: 5
+        max: 8
+        passed: false
+        comment: Border radius, edge strokes, and letter-spacing add polish above
+          a stock default, but overall still close to a well-configured MUI X chart
+      - id: DE-02
+        name: Visual Refinement
+        score: 4
+        max: 6
+        passed: false
+        comment: New pageBg edge stroke and border radius on bars give visible refinement;
+          grid subtle, spines minimal
+      - id: DE-03
+        name: Data Storytelling
+        score: 3
+        max: 6
+        passed: false
+        comment: Bold total labels create a clear focal point on the Development peak,
+          but segments aren't further differentiated for storytelling
+    spec_compliance:
+      score: 15
+      max: 15
+      items:
+      - id: SC-01
+        name: Plot Type
+        score: 5
+        max: 5
+        passed: true
+        comment: Correct stacked bar chart
+      - id: SC-02
+        name: Required Features
+        score: 4
+        max: 4
+        passed: true
+        comment: Total labels above each stack, adequate headroom, all spec features
+          present
+      - id: SC-03
+        name: Data Mapping
+        score: 3
+        max: 3
+        passed: true
+        comment: Category on x-axis, value stacked by component on y-axis
+      - id: SC-04
+        name: Title & Legend
+        score: 3
+        max: 3
+        passed: true
+        comment: Title format correct; legend labels match cost-type series
+    data_quality:
+      score: 15
+      max: 15
+      items:
+      - id: DQ-01
+        name: Feature Coverage
+        score: 6
+        max: 6
+        passed: true
+        comment: Segment proportions vary meaningfully across phases (Development
+          dominated by Labor, Planning more balanced)
+      - id: DQ-02
+        name: Realistic Context
+        score: 5
+        max: 5
+        passed: true
+        comment: Neutral, realistic project-budget-by-phase scenario
+      - id: DQ-03
+        name: Appropriate Scale
+        score: 4
+        max: 4
+        passed: true
+        comment: Plausible cost figures and proportions for a project budget in $
+          thousands
+    code_quality:
+      score: 10
+      max: 10
+      items:
+      - id: CQ-01
+        name: KISS Structure
+        score: 3
+        max: 3
+        passed: true
+        comment: Straightforward data → overlay component → chart; TotalLabels component
+          is required for the hooks pattern, not over-engineering
+      - id: CQ-02
+        name: Reproducibility
+        score: 2
+        max: 2
+        passed: true
+        comment: Deterministic hardcoded arrays
+      - id: CQ-03
+        name: Clean Imports
+        score: 2
+        max: 2
+        passed: true
+        comment: Only used imports (BarChart, hooks, Box, Typography)
+      - id: CQ-04
+        name: Code Elegance
+        score: 2
+        max: 2
+        passed: true
+        comment: Appropriate complexity, no fake functionality
+      - id: CQ-05
+        name: Output & API
+        score: 1
+        max: 1
+        passed: true
+        comment: Harness-mounted component, current MUI X API
+    library_mastery:
+      score: 8
+      max: 10
+      items:
+      - id: LM-01
+        name: Idiomatic Usage
+        score: 4
+        max: 5
+        passed: true
+        comment: Correct high-level BarChart API usage, stack config, sx/slotProps
+          overrides
+      - id: LM-02
+        name: Distinctive Features
+        score: 4
+        max: 5
+        passed: true
+        comment: useXScale/useYScale hooks drive a scale-accurate custom overlay —
+          distinctive to MUI X
+  verdict: APPROVED
+impl_tags:
+  dependencies: []
+  techniques:
+  - annotations
+  patterns:
+  - data-generation
+  dataprep: []
+  styling:
+  - edge-highlighting