diff --git a/.changeset/chartconfig-trim-zoom-clickaction.md b/.changeset/chartconfig-trim-zoom-clickaction.md
new file mode 100644
index 0000000000..68ea61688d
--- /dev/null
+++ b/.changeset/chartconfig-trim-zoom-clickaction.md
@@ -0,0 +1,38 @@
+---
+'@objectstack/spec': minor
+---
+
+**BREAKING** `ChartInteraction` drops `zoom` and `clickAction`; `stepSize` / `description` / `height` are delivered (issue #3752)
+
+The tail of the declared-≠-delivered sweep from #3729. Five `ChartConfig` props
+reached the renderer and did nothing; each got the ADR-0078 call — honor it, or
+remove it. Three were honored (objectui#2885), two are removed here.
+
+**Removed — `ChartInteraction.zoom` and `ChartInteraction.clickAction`.** Both
+were redundant against something the platform already delivers, which is why
+neither had a consumer anywhere in the framework, the console, the showcase, or
+the skill corpus:
+
+- `zoom` had no renderer primitive behind it, and `brush` already narrows a
+  range. **Migration:** `interaction: { brush: true }`.
+- `clickAction` competed with two click owners that *do* work — `drillDown`
+  (opens the filtered records, which is what a segment click is almost always
+  for) and, in the react tier, the host's own `onSegmentClick`. A third, silent
+  owner only invited authors to wire a click that never fired.
+  **Migration:** `drillDown`, or handle the click in React.
+
+`ChartInteraction` is now `{ tooltips, brush }` — both honored. This follows the
+#1475 precedent: trim what cannot be cleanly delivered, implement the rest, and
+leave nothing declared-but-inert in between.
+
+**Delivered — `ChartAxis.stepSize`, `ChartConfig.description`, `ChartConfig.height`**
+(objectui#2885). `description` and `height` join `<ObjectChart>`'s published
+`dataProps` now that they do something; `stepSize` rides along inside
+`xAxis`/`yAxis`. Their schema descriptions say what they actually do rather than
+restating their names.
+
+Breaking, but shipped as `minor` per the launch-window convention (see
+`scripts/check-changeset-no-major.mjs`). Off-spec `zoom`/`clickAction` keys are
+stripped by Zod rather than rejected, so no stored metadata fails to parse — the
+break is at the TypeScript type level for anyone constructing a
+`ChartInteraction` in code.
diff --git a/content/docs/references/ui/chart.mdx b/content/docs/references/ui/chart.mdx
index e17a0c02cd..448ed8bc54 100644
--- a/content/docs/references/ui/chart.mdx
+++ b/content/docs/references/ui/chart.mdx
@@ -100,16 +100,16 @@ Inline aggregation for an object-bound chart
 | **type** | `Enum<'bar' \| 'horizontal-bar' \| 'column' \| 'line' \| 'area' \| 'pie' \| 'donut' \| 'funnel' \| 'scatter' \| 'treemap' \| 'sankey' \| 'gauge' \| 'solid-gauge' \| 'metric' \| 'kpi' \| 'bullet' \| 'radar' \| 'table' \| 'pivot'>` | ✅ |  |
 | **title** | `string` | optional | Chart title |
 | **subtitle** | `string` | optional | Chart subtitle |
-| **description** | `string` | optional | Accessibility description |
+| **description** | `string` | optional | Accessibility description — announced to screen readers as the chart’s label |
 | **xAxis** | `{ field: string; title?: string; format?: string; min?: number; … }` | optional | X-Axis configuration |
 | **yAxis** | `{ field: string; title?: string; format?: string; min?: number; … }[]` | optional | Y-Axis configuration (support dual axis) |
 | **series** | `{ name: string; label?: string; type?: Enum<'bar' \| 'horizontal-bar' \| 'column' \| 'line' \| 'area' \| 'pie' \| 'donut' \| 'funnel' \| 'scatter' \| 'treemap' \| 'sankey' \| 'gauge' \| 'solid-gauge' \| 'metric' \| 'kpi' \| 'bullet' \| 'radar' \| 'table' \| 'pivot'>; color?: string; … }[]` | optional | Defined series configuration |
 | **colors** | `string[] \| Record<string, string>` | optional | Color palette (string[]) or value→color map (`{ value: color }`) |
-| **height** | `number` | optional | Fixed height in pixels |
+| **height** | `number` | optional | Fixed plot height in pixels (overrides the container default) |
 | **showLegend** | `boolean` | ✅ | Display legend |
 | **showDataLabels** | `boolean` | ✅ | Display data labels |
 | **annotations** | `{ type: Enum<'line' \| 'region'>; axis: Enum<'x' \| 'y'>; value: number \| string; endValue?: number \| string; … }[]` | optional | Reference lines/bands drawn over the plot: `{ type: "line" \| "region", axis: "x" \| "y", value, endValue?, color?, label?, style? }` |
-| **interaction** | `{ tooltips: boolean; zoom: boolean; brush: boolean; clickAction?: string }` | optional | Interaction toggles: `{ tooltips?, brush?, zoom?, clickAction? }` |
+| **interaction** | `{ tooltips: boolean; brush: boolean }` | optional | Interaction toggles: `{ tooltips?, brush? }` |
 | **aria** | `{ ariaLabel?: string; ariaDescribedBy?: string; role?: string }` | optional | ARIA accessibility attributes |
 
 
@@ -151,9 +151,7 @@ Type: `string`
 | Property | Type | Required | Description |
 | :--- | :--- | :--- | :--- |
 | **tooltips** | `boolean` | ✅ | Show the hover tooltip |
-| **zoom** | `boolean` | ✅ | Pan/zoom the plot — NOT implemented by the default renderer; use `brush` |
 | **brush** | `boolean` | ✅ | Show the range selector under the plot |
-| **clickAction** | `string` | optional | Action ID to trigger on click |
 
 
 ---
diff --git a/content/docs/references/ui/report.mdx b/content/docs/references/ui/report.mdx
index ba7d583b57..51e78ac3a5 100644
--- a/content/docs/references/ui/report.mdx
+++ b/content/docs/references/ui/report.mdx
@@ -82,16 +82,16 @@ const result = JoinedReportBlock.parse(data);
 | **type** | `Enum<'bar' \| 'horizontal-bar' \| 'column' \| 'line' \| 'area' \| 'pie' \| 'donut' \| 'funnel' \| 'scatter' \| 'treemap' \| 'sankey' \| 'gauge' \| 'solid-gauge' \| 'metric' \| 'kpi' \| 'bullet' \| 'radar' \| 'table' \| 'pivot'>` | ✅ |  |
 | **title** | `string` | optional | Chart title |
 | **subtitle** | `string` | optional | Chart subtitle |
-| **description** | `string` | optional | Accessibility description |
+| **description** | `string` | optional | Accessibility description — announced to screen readers as the chart’s label |
 | **xAxis** | `string` | ✅ | Dataset dimension name for the X-axis (bound-dataset dimension, not a raw field) |
 | **yAxis** | `string` | ✅ | Dataset measure name for the Y-axis (bound-dataset measure, not a raw field) |
 | **series** | `{ name: string; label?: string; type?: Enum<'bar' \| 'horizontal-bar' \| 'column' \| 'line' \| 'area' \| 'pie' \| 'donut' \| 'funnel' \| 'scatter' \| 'treemap' \| 'sankey' \| 'gauge' \| 'solid-gauge' \| 'metric' \| 'kpi' \| 'bullet' \| 'radar' \| 'table' \| 'pivot'>; color?: string; … }[]` | optional | Defined series configuration |
 | **colors** | `string[] \| Record<string, string>` | optional | Color palette (string[]) or value→color map (`{ value: color }`) |
-| **height** | `number` | optional | Fixed height in pixels |
+| **height** | `number` | optional | Fixed plot height in pixels (overrides the container default) |
 | **showLegend** | `boolean` | ✅ | Display legend |
 | **showDataLabels** | `boolean` | ✅ | Display data labels |
 | **annotations** | `{ type: Enum<'line' \| 'region'>; axis: Enum<'x' \| 'y'>; value: number \| string; endValue?: number \| string; … }[]` | optional | Reference lines/bands drawn over the plot: `{ type: "line" \| "region", axis: "x" \| "y", value, endValue?, color?, label?, style? }` |
-| **interaction** | `{ tooltips: boolean; zoom: boolean; brush: boolean; clickAction?: string }` | optional | Interaction toggles: `{ tooltips?, brush?, zoom?, clickAction? }` |
+| **interaction** | `{ tooltips: boolean; brush: boolean }` | optional | Interaction toggles: `{ tooltips?, brush? }` |
 | **aria** | `{ ariaLabel?: string; ariaDescribedBy?: string; role?: string }` | optional | ARIA accessibility attributes |
 
 
diff --git a/packages/spec/src/ui/chart.zod.ts b/packages/spec/src/ui/chart.zod.ts
index ff623a7818..5b1daa9063 100644
--- a/packages/spec/src/ui/chart.zod.ts
+++ b/packages/spec/src/ui/chart.zod.ts
@@ -72,9 +72,11 @@ export const ChartTypeSchema = lazySchema(() => z.enum([
 // (`ChartSeries.stack` — series sharing a group id stack, otherwise they
 // group). One `bar` family plus a series-level stack group expresses all three
 // without multiplying the taxonomy. The renderer honors it (objectui#2880);
-// before that it did not, which is why they once sat in the list above. (`metric`/`kpi` are kept as honest single-value
-// synonyms; `gauge`/`solid-gauge`/`bullet` render a value today and gain a dial
-// when a gauge renderer lands.)
+// before that it did not, which is why they once sat in the list above.
+//
+// `metric`/`kpi` are kept as honest single-value synonyms; `gauge`/
+// `solid-gauge`/`bullet` render a value today and gain a dial when a gauge
+// renderer lands.
 
 export type ChartType = z.infer<typeof ChartTypeSchema>;
 
@@ -163,18 +165,23 @@ export const ChartAnnotationSchema = lazySchema(() => z.object({
 
 /**
  * Chart Interaction Schema
+ *
+ * Both toggles are honored by the renderer. Two former members were removed in
+ * #3752 rather than left declared-but-inert (ADR-0078; the #1475 trim-vs-
+ * implement call), because each was redundant against something the platform
+ * already delivers:
+ *
+ *   * `zoom` — no renderer had a zoom primitive behind it, and `brush` already
+ *     narrows a range. Migration: `brush: true`.
+ *   * `clickAction` — a chart segment click already has two owners that DO
+ *     work: `drillDown` (opens the filtered records, which is what a segment
+ *     click is almost always for) and, in the react tier, the host's own
+ *     `onSegmentClick`. A third, silent one only invited authors to wire a
+ *     click that never fired. Migration: `drillDown`, or handle it in React.
  */
 export const ChartInteractionSchema = lazySchema(() => z.object({
   tooltips: z.boolean().default(true).describe('Show the hover tooltip'),
-  /**
-   * ⚠️ Declared, not delivered. The default Recharts renderer has no zoom
-   * primitive, so this draws nothing today — `brush` is the shipped way to
-   * narrow a range. Kept in the schema because an opt-in renderer can honor it;
-   * tracked with the rest of the chart-contract work in framework#3729.
-   */
-  zoom: z.boolean().default(false).describe('Pan/zoom the plot — NOT implemented by the default renderer; use `brush`'),
   brush: z.boolean().default(false).describe('Show the range selector under the plot'),
-  clickAction: z.string().optional().describe('Action ID to trigger on click'),
 }));
 
 /**
@@ -188,7 +195,7 @@ export const ChartConfigSchema = lazySchema(() => z.object({
   /** Titles */
   title: I18nLabelSchema.optional().describe('Chart title'),
   subtitle: I18nLabelSchema.optional().describe('Chart subtitle'),
-  description: I18nLabelSchema.optional().describe('Accessibility description'),
+  description: I18nLabelSchema.optional().describe('Accessibility description — announced to screen readers as the chart’s label'),
   
   /** Axes Mapping */
   xAxis: ChartAxisSchema.optional().describe('X-Axis configuration'),
@@ -206,7 +213,7 @@ export const ChartConfigSchema = lazySchema(() => z.object({
     z.array(z.string()),
     z.record(z.string(), z.string()),
   ]).optional().describe('Color palette (string[]) or value→color map ({ value: color })'),
-  height: z.number().optional().describe('Fixed height in pixels'),
+  height: z.number().optional().describe('Fixed plot height in pixels (overrides the container default)'),
   
   /** Components */
   showLegend: z.boolean().default(true).describe('Display legend'),
@@ -218,7 +225,7 @@ export const ChartConfigSchema = lazySchema(() => z.object({
   
   /** Interactions */
   interaction: ChartInteractionSchema.optional()
-    .describe('Interaction toggles: { tooltips?, brush?, zoom?, clickAction? }'),
+    .describe('Interaction toggles: { tooltips?, brush? }'),
 
   /** ARIA accessibility attributes */
   aria: AriaPropsSchema.optional().describe('ARIA accessibility attributes'),
diff --git a/packages/spec/src/ui/react-blocks.ts b/packages/spec/src/ui/react-blocks.ts
index 387354b36b..9ea86fe97d 100644
--- a/packages/spec/src/ui/react-blocks.ts
+++ b/packages/spec/src/ui/react-blocks.ts
@@ -116,7 +116,7 @@ export const REACT_BLOCKS: ReactBlockDef[] = [
     // react-page wrapper parks an author `type` beside it and the renderer
     // reads it back. It is published here as the spec spells it; the internal
     // `chartType` spelling is no longer part of the author contract.
-    dataProps: ['type', 'title', 'subtitle', 'xAxis', 'yAxis', 'series', 'colors', 'showLegend', 'showDataLabels', 'annotations', 'interaction'],
+    dataProps: ['type', 'title', 'subtitle', 'description', 'height', 'xAxis', 'yAxis', 'series', 'colors', 'showLegend', 'showDataLabels', 'annotations', 'interaction'],
     interactions: [
       OBJECT_NAME,
       { name: 'filter', type: 'FilterArray', kind: 'controlled', description: 'ObjectQL filter scoping the data; drive from React state.' },
diff --git a/skills/objectstack-ui/contracts/react-blocks.contract.json b/skills/objectstack-ui/contracts/react-blocks.contract.json
index 9561b30291..18ec1ff549 100644
--- a/skills/objectstack-ui/contracts/react-blocks.contract.json
+++ b/skills/objectstack-ui/contracts/react-blocks.contract.json
@@ -341,6 +341,20 @@
           "required": false,
           "description": "Chart subtitle"
         },
+        {
+          "name": "description",
+          "type": "string",
+          "kind": "data",
+          "required": false,
+          "description": "Accessibility description — announced to screen readers as the chart’s label"
+        },
+        {
+          "name": "height",
+          "type": "number",
+          "kind": "data",
+          "required": false,
+          "description": "Fixed plot height in pixels (overrides the container default)"
+        },
         {
           "name": "xAxis",
           "type": "object",
@@ -395,7 +409,7 @@
           "type": "object",
           "kind": "data",
           "required": false,
-          "description": "Interaction toggles: { tooltips?, brush?, zoom?, clickAction? }"
+          "description": "Interaction toggles: { tooltips?, brush? }"
         }
       ]
     },
diff --git a/skills/objectstack-ui/references/react-blocks.md b/skills/objectstack-ui/references/react-blocks.md
index 1afbaa9434..f4b7a9ab7f 100644
--- a/skills/objectstack-ui/references/react-blocks.md
+++ b/skills/objectstack-ui/references/react-blocks.md
@@ -76,6 +76,8 @@ Chart over an object’s aggregated data. Bind objectName + aggregate; the axes
 | `type` | `'bar' \| 'horizontal-bar' \| 'column' \| 'line' \| 'area' \| 'pie' \| 'donut' \| 'funnel' \| 'scatter' \| 'treemap' \| 'sankey' \| 'gauge' \| 'solid-gauge' \| 'metric' \| 'kpi' \| 'bullet' \| 'radar' \| 'table' \| 'pivot'` | data | ✓ |  |
 | `title` | `string` | data |  | Chart title |
 | `subtitle` | `string` | data |  | Chart subtitle |
+| `description` | `string` | data |  | Accessibility description — announced to screen readers as the chart’s label |
+| `height` | `number` | data |  | Fixed plot height in pixels (overrides the container default) |
 | `xAxis` | `object` | data |  | X-Axis configuration |
 | `yAxis` | `object[]` | data |  | Y-Axis configuration (support dual axis) |
 | `series` | `object[]` | data |  | Defined series configuration |
@@ -83,7 +85,7 @@ Chart over an object’s aggregated data. Bind objectName + aggregate; the axes
 | `showLegend` | `boolean` | data |  | Display legend |
 | `showDataLabels` | `boolean` | data |  | Display data labels |
 | `annotations` | `object[]` | data |  | Reference lines/bands drawn over the plot: { type: "line" \| "region", axis: "x" \| "y", value, endValue?, color?, label?, style? } |
-| `interaction` | `object` | data |  | Interaction toggles: { tooltips?, brush?, zoom?, clickAction? } |
+| `interaction` | `object` | data |  | Interaction toggles: { tooltips?, brush? } |
 
 ## `<RecordDetails>` — `record:details`