@@ -0,0 +1,10 @@
+---
+'@object-ui/plugin-dashboard': patch
+---
+
+feat(plugin-dashboard): a dataset-bound KPI tile opens the records behind its number
+
+Clause-②: no
+Metadata-protocol: none
+
+A dashboard metric tile bound to a dataset now opens the same drill drawer its charts and tables already open, by click or by Enter/Space. The list is the widget's filter (the dashboard's filters included) AND the answer's date window AND the measure's `drillScopes` entry, which carries the dataset's own filter and the measure's own filter, so the records listed are the records the number counts. A tile whose measure has no `drillScopes` entry (a derived measure, or a scope that names a relationship path) offers no click, as does a tile whose filter the list cannot express; its markup is unchanged. Nothing to author: the click follows from the dataset answer.
@@ -33,7 +33,7 @@
  * objectui bumps its `@objectstack/spec` dependency (cross-repo spec skew).
  */
 
-import { useEffect, useMemo, useState, type ReactElement } from 'react';
+import { useEffect, useMemo, useState, type ReactElement, type KeyboardEvent as ReactKeyboardEvent } from 'react';
 // `useDatasetDimensionMeta` is the analytics label net's SHARED React glue
 // (objectui#4389): the locale-free metadata read this widget and the dataset
 // report block both take, lifted out of the two longhand copies PR #4388 left
@@ -105,6 +105,7 @@ import {
   metricTileValueTitle,
 } from './metricTile';
 import { DrillDownDrawer } from './DrillDownDrawer';
+import { metricDrillFilter, readMeasureDrillScope } from './metricDrill';
 import { specDefaultWidgetType } from './widgetDispatch';
 import { DASHBOARD_WIDGET_MULTI_MEASURE_TYPES } from '@objectstack/spec/ui';
 
@@ -113,7 +114,7 @@ type Row = Record<string, unknown>;
 // `@objectstack/spec/api`'s `DatasetTotals`, which since 17.5.0 is the REQUEST side
 // (`{ groupings }`, what to compute) — objectui#11073.
 interface DatasetResultTotals { dimensions: string[]; rows: Row[] }
-interface DatasetResult { rows: Row[]; fields?: DatasetResultField[]; object?: string; dimensionFields?: Record<string, string>; drillRawRows?: Row[]; drillRanges?: Array<Record<string, DatasetDrillRange>>; totals?: DatasetResultTotals[] }
+interface DatasetResult { rows: Row[]; fields?: DatasetResultField[]; object?: string; dimensionFields?: Record<string, string>; drillRawRows?: Row[]; drillRanges?: Array<Record<string, DatasetDrillRange>>; totals?: DatasetResultTotals[]; drillScopes?: Record<string, unknown> }
 interface DatasetCapableSource {
   queryDataset?: (dataset: string, selection: unknown) => Promise<DatasetResult>;
 }
@@ -898,7 +899,7 @@ export function DatasetWidget({ widget, dataSource, heading, onForbidden }: {
 
   // `signature` is the query an `ok` answer was read for, and `refreshing` marks
   // a re-read of that same query in flight (objectui#10815, see the effect).
-  const [state, setState] = useState<{ status: 'idle' | 'loading' | 'ok' | 'error'; rows: Row[]; fields?: DatasetResultField[]; object?: string; dimensionFields?: Record<string, string>; drillRawRows?: Array<Record<string, unknown>>; drillRanges?: Array<Record<string, DatasetDrillRange>>; totals?: DatasetResultTotals[]; error?: string; forbidden?: boolean; signature?: string; refreshing?: boolean }>({ status: 'idle', rows: [] });
+  const [state, setState] = useState<{ status: 'idle' | 'loading' | 'ok' | 'error'; rows: Row[]; fields?: DatasetResultField[]; object?: string; dimensionFields?: Record<string, string>; drillRawRows?: Array<Record<string, unknown>>; drillRanges?: Array<Record<string, DatasetDrillRange>>; totals?: DatasetResultTotals[]; drillScopes?: unknown; error?: string; forbidden?: boolean; signature?: string; refreshing?: boolean }>({ status: 'idle', rows: [] });
   // Drill-through (ADR-0021 D2): the clicked bucket's record-list filter + title.
   const [drill, setDrill] = useState<{ filter: Record<string, unknown>; title: string } | null>(null);
   // ── The flat table's client-side sort (objectui#5827) ────────────────────
@@ -967,7 +968,7 @@ export function DatasetWidget({ widget, dataSource, heading, onForbidden }: {
     })
       .then((res) => {
         if (cancelled) return;
-        setState({ status: 'ok', rows: Array.isArray(res?.rows) ? res.rows : [], fields: Array.isArray(res?.fields) ? res.fields : [], object: res?.object, dimensionFields: res?.dimensionFields, drillRawRows: Array.isArray(res?.drillRawRows) ? res.drillRawRows : undefined, drillRanges: Array.isArray(res?.drillRanges) ? res.drillRanges : undefined, totals: Array.isArray(res?.totals) ? res.totals : undefined, signature });
+        setState({ status: 'ok', rows: Array.isArray(res?.rows) ? res.rows : [], fields: Array.isArray(res?.fields) ? res.fields : [], object: res?.object, dimensionFields: res?.dimensionFields, drillRawRows: Array.isArray(res?.drillRawRows) ? res.drillRawRows : undefined, drillRanges: Array.isArray(res?.drillRanges) ? res.drillRanges : undefined, totals: Array.isArray(res?.totals) ? res.totals : undefined, drillScopes: res?.drillScopes, signature });
         if (typeof res?.object === 'string' && res.object) setDatasetObject(res.object);
       })
       .catch((e) => {
@@ -1392,11 +1393,43 @@ export function DatasetWidget({ widget, dataSource, heading, onForbidden }: {
     // the title's tooltip (objectstack#27430).
     const caption = heading?.description || measureLabel;
     const shownValue = formatMeasure(value, f?.format, f?.currency, f?.percentScale, displayLocale);
+    // ── The records behind the number (ADR-0021 D2) ────────────────────────
+    // The tile opens the list its number counts, through the same drawer the
+    // chart and table drills open. `null` means the list could not be proven
+    // to match the number (see `./metricDrill`), and the tile then offers no
+    // click at all: its markup stays exactly the no-click markup.
+    const tileDrillFilter = metricDrillFilter({
+      object: drillObject,
+      measureScope: readMeasureDrillScope(state, tileMeasure),
+      runtimeFilter,
+      ranges: drillRanges?.[0],
+    });
+    const openTileDrill = tileDrillFilter
+      ? () => setDrill({ filter: tileDrillFilter, title: heading?.title || measureLabel })
+      : undefined;
+    const tileDrillProps = openTileDrill
+      ? {
+          role: 'button' as const,
+          tabIndex: 0,
+          'data-testid': 'dataset-metric-drill',
+          onClick: openTileDrill,
+          onKeyDown: (e: ReactKeyboardEvent) => {
+            if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); openTileDrill(); }
+          },
+        }
+      : {};
+    // The drawer is a SIBLING of the tile, never its child: React bubbles a
+    // portal's events through the component tree, so a click or a space typed
+    // inside the drawer would otherwise reach the tile's own handlers.
     return (
-      // Positioned only while a re-read is in flight, for the refresh bar: the
-      // idle tile's markup is pinned byte-for-byte (`DatasetWidget.colorVariant`,
-      // `.subCaption`, `.unrenderedMeasures-8894` tests), and it moves by nothing.
-      <div className={cn('flex h-full w-full flex-col items-start justify-center gap-1 p-2', heading && cn('min-w-0', METRIC_TILE_CONTAINER_CLASS), state.refreshing && 'relative')}>
+      <>
+      {/* Positioned only while a re-read is in flight, for the refresh bar: the
+          idle tile's markup is pinned byte-for-byte (`DatasetWidget.colorVariant`,
+          `.subCaption`, `.unrenderedMeasures-8894` tests), and it moves by nothing. */}
+      <div
+        className={cn('flex h-full w-full flex-col items-start justify-center gap-1 p-2', heading && cn('min-w-0', METRIC_TILE_CONTAINER_CLASS), state.refreshing && 'relative', openTileDrill && 'cursor-pointer rounded-md transition-colors hover:bg-accent/40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring')}
+        {...tileDrillProps}
+      >
         {refreshBar}
         {/* objectui#12623 — with a heading, the title owns the first line, the
             value never wraps, and the caption (the description, else the
@@ -1428,6 +1461,8 @@ export function DatasetWidget({ widget, dataSource, heading, onForbidden }: {
         )}
         {!heading && <span className="text-xs text-muted-foreground">{measureLabel}</span>}
       </div>
+      {drillDrawer}
+      </>
     );
   }
 
 
@@ -1061,3 +1061,74 @@ describe('DatasetWidget — dimension metadata probe (objectui#5280)', () => {
     expect(screen.queryByText('in_progress')).not.toBeInTheDocument();
   });
 });
+
+// ── The KPI tile's click (ADR-0021 D2) ───────────────────────────────────────
+// A tile drills only when the answer carries a `drillScopes` entry for its
+// measure, and the list it opens is the widget filter AND that entry.
+describe('DatasetWidget metric tile drill', () => {
+  const OPEN = { stage: { $nin: ['closed_won', 'closed_lost'] } };
+  const tileSource = (answer: Record<string, unknown>) => ({
+    queryDataset: vi.fn(async () => ({
+      rows: [{ total_amount: 814400 }],
+      fields: [{ name: 'total_amount', type: 'number', label: 'Total Amount', aggregate: 'sum' }],
+      object: 'crm_opportunity',
+      ...answer,
+    })),
+    // Parameters declared: the assertions read `find.mock.calls[0][1]`.
+    find: vi.fn(async (_object: string, _params: unknown) => ({ data: [] })),
+    getObjectSchema: vi.fn(async () => ({ fields: {} })),
+  });
+  const renderTile = (src: ReturnType<typeof tileSource>, filter: Record<string, unknown> | undefined = OPEN) =>
+    render(
+      <DatasetWidget
+        widget={{ type: 'metric', dataset: 'opportunity_metrics', values: ['total_amount'], ...(filter ? { filter } : {}) }}
+        dataSource={src}
+      />,
+    );
+
+  it('offers no click when the answer carries no drillScopes', async () => {
+    renderTile(tileSource({}));
+    await screen.findByText('814400');
+    expect(screen.queryByTestId('dataset-metric-drill')).not.toBeInTheDocument();
+    expect(screen.queryByRole('button')).not.toBeInTheDocument();
+  });
+
+  it('offers no click when the tile measure has no entry (a derived measure)', async () => {
+    renderTile(tileSource({ drillScopes: { opp_count: {} } }));
+    await screen.findByText('814400');
+    expect(screen.queryByTestId('dataset-metric-drill')).not.toBeInTheDocument();
+  });
+
+  it('opens the widget filter AND the measure scope on click', async () => {
+    const src = tileSource({ drillScopes: { total_amount: { amount: { $null: false } } } });
+    renderTile(src);
+    fireEvent.click(await screen.findByTestId('dataset-metric-drill'));
+    await waitFor(() => expect(src.find).toHaveBeenCalled());
+    expect(src.find.mock.calls[0][0]).toBe('crm_opportunity');
+    expect((src.find.mock.calls[0][1] as any).$filter).toEqual({
+      $and: [{ stage: { $nin: ['closed_won', 'closed_lost'] } }, { amount: { $null: false } }],
+    });
+  });
+
+  it('opens the widget filter alone when the entry is empty', async () => {
+    const src = tileSource({ drillScopes: { total_amount: {} } });
+    renderTile(src);
+    fireEvent.keyDown(await screen.findByTestId('dataset-metric-drill'), { key: 'Enter' });
+    await waitFor(() => expect(src.find).toHaveBeenCalled());
+    expect((src.find.mock.calls[0][1] as any).$filter).toEqual(OPEN);
+  });
+
+  it('bounds the list by the answer date window', async () => {
+    const src = tileSource({
+      drillScopes: { total_amount: {} },
+      drillRanges: [{ close_date: { field: 'close_date', gte: '2026-10-01', lt: '2027-01-01' } }],
+    });
+    renderTile(src, { stage: 'closed_won' });
+    fireEvent.click(await screen.findByTestId('dataset-metric-drill'));
+    await waitFor(() => expect(src.find).toHaveBeenCalled());
+    const sent = JSON.stringify((src.find.mock.calls[0][1] as any).$filter);
+    expect(sent).toContain('closed_won');
+    expect(sent).toContain('2026-10-01');
+    expect(sent).toContain('2027-01-01');
+  });
+});
@@ -0,0 +1,66 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+import { describe, it, expect } from 'vitest';
+import { metricDrillFilter, readMeasureDrillScope } from '../metricDrill';
+
+describe('metricDrillFilter — the list a KPI tile opens (ADR-0021 D2)', () => {
+  it('offers no click when the answer names no object', () => {
+    expect(metricDrillFilter({ object: undefined, measureScope: {}, runtimeFilter: undefined })).toBeNull();
+  });
+
+  it('offers no click when the answer did not state the measure scope', () => {
+    expect(metricDrillFilter({ object: 'crm_opportunity', measureScope: undefined, runtimeFilter: { stage: 'closed_won' } })).toBeNull();
+  });
+
+  it('opens the widget filter alone when the measure has no scope of its own', () => {
+    expect(
+      metricDrillFilter({ object: 'crm_opportunity', measureScope: {}, runtimeFilter: { stage: { $nin: ['closed_won', 'closed_lost'] } } }),
+    ).toEqual({ stage: { $nin: ['closed_won', 'closed_lost'] } });
+  });
+
+  it('opens every record when neither side filters', () => {
+    expect(metricDrillFilter({ object: 'crm_opportunity', measureScope: {}, runtimeFilter: undefined })).toEqual({});
+  });
+
+  it('keeps the measure scope AND the widget filter, never only one of them', () => {
+    const filter = metricDrillFilter({ object: 'invoice', measureScope: { status: 'paid' }, runtimeFilter: { region: 'emea' } });
+    expect(filter).toEqual({ $and: [{ region: 'emea' }, { status: 'paid' }] });
+  });
+
+  it('keeps the measure scope when the widget declares no filter', () => {
+    expect(metricDrillFilter({ object: 'invoice', measureScope: { status: 'paid' }, runtimeFilter: undefined })).toEqual({ status: 'paid' });
+  });
+
+  it('bounds the list by the answer date window', () => {
+    const filter = metricDrillFilter({
+      object: 'crm_opportunity',
+      measureScope: {},
+      runtimeFilter: { stage: 'closed_won' },
+      ranges: { close_date: { field: 'close_date', gte: '2026-10-01', lt: '2027-01-01' } },
+    });
+    expect(JSON.stringify(filter)).toContain('2026-10-01');
+    expect(JSON.stringify(filter)).toContain('closed_won');
+  });
+
+  it('offers no click when the widget filter cannot become a list filter', () => {
+    // A scalar on a list operator is refused by the shared drill sink.
+    expect(metricDrillFilter({ object: 'invoice', measureScope: { status: 'paid' }, runtimeFilter: [['stage', 'in', 'won']] })).toBeNull();
+  });
+});
+
+describe('readMeasureDrillScope — the answer drillScopes entry', () => {
+  it('reads the tile measure entry', () => {
+    expect(readMeasureDrillScope({ drillScopes: { paid_count: { status: 'paid' } } }, 'paid_count')).toEqual({ status: 'paid' });
+  });
+
+  it('reads an empty entry as a scope with no extra condition', () => {
+    expect(readMeasureDrillScope({ drillScopes: { total_amount: {} } }, 'total_amount')).toEqual({});
+  });
+
+  it('reads a missing entry, a missing map or no measure as "no scope"', () => {
+    expect(readMeasureDrillScope({ drillScopes: { opp_count: {} } }, 'paid_rate')).toBeUndefined();
+    expect(readMeasureDrillScope({}, 'total_amount')).toBeUndefined();
+    expect(readMeasureDrillScope(undefined, 'total_amount')).toBeUndefined();
+    expect(readMeasureDrillScope({ drillScopes: { total_amount: {} } }, undefined)).toBeUndefined();
+  });
+});
@@ -0,0 +1,70 @@
+/**
+ * ObjectUI
+ * Copyright (c) 2024-present ObjectStack Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * The record list behind a dataset-bound KPI tile (ADR-0021 D2).
+ *
+ * A tile's number is the dataset's own scope AND the measure's own filter AND
+ * the widget's filter (the dashboard's filters are already merged into it).
+ * The first two live in the dataset definition, which this package never
+ * reads: the server hands them over per measure as the answer's `drillScopes`
+ * entry, already lowered to a list filter on the answer's `object`. A measure
+ * with no entry (a derived measure, or a scope naming a relationship path) has
+ * no list that selects its records.
+ *
+ * Invariant: a tile offers a click only when its list provably matches its
+ * number. Every "cannot tell" answer below is `null`, never a looser filter.
+ */
+
+import { buildDatasetDrillFilter, composeDrillFilter, FilterOperatorError } from '@object-ui/core';
+import type { DatasetDrillRange } from '@object-ui/core';
+
+export interface MetricDrillInput {
+  /** The dataset's base object, from the answer (`object`). */
+  object: string | undefined;
+  /**
+   * The tile measure's `drillScopes` entry: `undefined` when the answer has
+   * none (no click), else the list filter its records need (`{}` = none).
+   */
+  measureScope: Record<string, unknown> | undefined;
+  /** The widget's resolved filter (placeholders already resolved). */
+  runtimeFilter: unknown;
+  /** The answer's date windows for the tile's single row (`drillRanges[0]`). */
+  ranges?: Record<string, DatasetDrillRange>;
+}
+
+/**
+ * The list filter a tile's click opens, or `null` when the tile must offer no
+ * click. Computed before rendering, so a refused filter shows no affordance
+ * instead of a click that does nothing.
+ */
+export function metricDrillFilter(input: MetricDrillInput): Record<string, unknown> | null {
+  const { object, measureScope, runtimeFilter, ranges } = input;
+  if (!object || measureScope === undefined) return null;
+  try {
+    const hasScope = Object.keys(measureScope).length > 0;
+    const scoped = hasScope ? composeDrillFilter(runtimeFilter, measureScope) : runtimeFilter;
+    return buildDatasetDrillFilter(undefined, [], {}, scoped, ranges);
+  } catch (error) {
+    if (error instanceof FilterOperatorError) return null;
+    throw error;
+  }
+}
+
+/** Read one measure's `drillScopes` entry off a dataset answer. */
+export function readMeasureDrillScope(
+  answer: { drillScopes?: unknown } | null | undefined,
+  measure: string | undefined,
+): Record<string, unknown> | undefined {
+  const scopes = answer?.drillScopes;
+  if (!measure || !scopes || typeof scopes !== 'object' || Array.isArray(scopes)) return undefined;
+  const entry = (scopes as Record<string, unknown>)[measure];
+  return entry && typeof entry === 'object' && !Array.isArray(entry)
+    ? (entry as Record<string, unknown>)
+    : undefined;
+}