diff --git a/apps/docs/document-api/reference/_generated-manifest.json b/apps/docs/document-api/reference/_generated-manifest.json
index c891d1e50a..2f633172a2 100644
--- a/apps/docs/document-api/reference/_generated-manifest.json
+++ b/apps/docs/document-api/reference/_generated-manifest.json
@@ -604,5 +604,5 @@
     }
   ],
   "marker": "{/* GENERATED FILE: DO NOT EDIT. Regenerate via `pnpm run docapi:sync`. */}",
-  "sourceHash": "b63b0a6c2c6b7ace1058a491081caef624f258010a0c36139755f1a3a9cd34b6"
+  "sourceHash": "d1b97baae61be333b72dc1211180bc02dd451e14a3767328d56929bf77a10132"
 }
diff --git a/apps/docs/document-api/reference/format/caps.mdx b/apps/docs/document-api/reference/format/caps.mdx
index 015f8364a7..af8552b57c 100644
--- a/apps/docs/document-api/reference/format/caps.mdx
+++ b/apps/docs/document-api/reference/format/caps.mdx
@@ -16,7 +16,7 @@ Set or clear the `caps` inline run property on the target text range.
 - API member path: `editor.doc.format.caps(...)`
 - Mutates document: `yes`
 - Idempotency: `conditional`
-- Supports tracked mode: `no`
+- Supports tracked mode: `yes`
 - Supports dry run: `yes`
 - Deterministic target resolution: `yes`
 
diff --git a/apps/docs/document-api/reference/format/index.mdx b/apps/docs/document-api/reference/format/index.mdx
index 539a866d59..c4bb2c68c0 100644
--- a/apps/docs/document-api/reference/format/index.mdx
+++ b/apps/docs/document-api/reference/format/index.mdx
@@ -28,7 +28,7 @@ Canonical formatting mutation with directive semantics ('on', 'off', 'clear').
 | <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/position"><code>format.position</code></a></span> | `format.position` | Yes | `conditional` | Yes | Yes |
 | <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/dstrike"><code>format.dstrike</code></a></span> | `format.dstrike` | Yes | `conditional` | No | Yes |
 | <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/small-caps"><code>format.smallCaps</code></a></span> | `format.smallCaps` | Yes | `conditional` | No | Yes |
-| <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/caps"><code>format.caps</code></a></span> | `format.caps` | Yes | `conditional` | No | Yes |
+| <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/caps"><code>format.caps</code></a></span> | `format.caps` | Yes | `conditional` | Yes | Yes |
 | <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/shading"><code>format.shading</code></a></span> | `format.shading` | Yes | `conditional` | No | Yes |
 | <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/border"><code>format.border</code></a></span> | `format.border` | Yes | `conditional` | No | Yes |
 | <span style={{ whiteSpace: 'nowrap', wordBreak: 'normal', overflowWrap: 'normal' }}><a href="/document-api/reference/format/outline"><code>format.outline</code></a></span> | `format.outline` | Yes | `conditional` | No | Yes |
diff --git a/packages/document-api/src/format/format.test.ts b/packages/document-api/src/format/format.test.ts
index 6023774ec6..505c417229 100644
--- a/packages/document-api/src/format/format.test.ts
+++ b/packages/document-api/src/format/format.test.ts
@@ -176,6 +176,35 @@ describe('executeInlineAlias', () => {
   });
 });
 
+describe('executeInlineAlias: format.caps', () => {
+  it('format.caps accepts omitted value (defaults to true)', () => {
+    const adapter = makeAdapter();
+    executeInlineAlias(adapter, 'caps', { target: TARGET });
+    expect(adapter.apply).toHaveBeenCalledWith(
+      { target: TARGET, inline: { caps: true } },
+      expect.objectContaining({ changeMode: 'direct' }),
+    );
+  });
+
+  it('format.caps accepts explicit false', () => {
+    const adapter = makeAdapter();
+    executeInlineAlias(adapter, 'caps', { target: TARGET, value: false });
+    expect(adapter.apply).toHaveBeenCalledWith(
+      { target: TARGET, inline: { caps: false } },
+      expect.objectContaining({ changeMode: 'direct' }),
+    );
+  });
+
+  it('format.caps accepts null to clear', () => {
+    const adapter = makeAdapter();
+    executeInlineAlias(adapter, 'caps', { target: TARGET, value: null });
+    expect(adapter.apply).toHaveBeenCalledWith(
+      { target: TARGET, inline: { caps: null } },
+      expect.objectContaining({ changeMode: 'direct' }),
+    );
+  });
+});
+
 // ---------------------------------------------------------------------------
 // FormatInlineAliasInput — compile-time type shape assertions
 // ---------------------------------------------------------------------------
diff --git a/packages/document-api/src/format/inline-run-patch.test.ts b/packages/document-api/src/format/inline-run-patch.test.ts
new file mode 100644
index 0000000000..dec3e70b63
--- /dev/null
+++ b/packages/document-api/src/format/inline-run-patch.test.ts
@@ -0,0 +1,46 @@
+import { describe, expect, it } from 'vitest';
+import { INLINE_PROPERTY_BY_KEY } from './inline-run-patch.js';
+
+describe('INLINE_PROPERTY_REGISTRY: caps entry', () => {
+  const entry = INLINE_PROPERTY_BY_KEY['caps'];
+
+  it('exists in the registry', () => {
+    expect(entry).toBeDefined();
+  });
+
+  it('uses mark storage (not runAttribute)', () => {
+    expect(entry.storage).toBe('mark');
+  });
+
+  it('targets the textStyle mark with textTransform attribute', () => {
+    expect(entry.carrier).toEqual({
+      storage: 'mark',
+      markName: 'textStyle',
+      textStyleAttr: 'textTransform',
+    });
+  });
+
+  it('accepts boolean input type', () => {
+    expect(entry.type).toBe('boolean');
+  });
+
+  it('maps to the w:caps OOXML element', () => {
+    expect(entry.ooxmlElement).toBe('w:caps');
+  });
+});
+
+describe('INLINE_PROPERTY_REGISTRY: smallCaps entry', () => {
+  const entry = INLINE_PROPERTY_BY_KEY['smallCaps'];
+
+  it('uses runAttribute storage (distinct from caps)', () => {
+    expect(entry.storage).toBe('runAttribute');
+  });
+
+  it('targets the run node with smallCaps property key', () => {
+    expect(entry.carrier).toEqual({
+      storage: 'runAttribute',
+      nodeName: 'run',
+      runPropertyKey: 'smallCaps',
+    });
+  });
+});
diff --git a/packages/document-api/src/format/inline-run-patch.ts b/packages/document-api/src/format/inline-run-patch.ts
index 34e3dfd40a..7c4755718c 100644
--- a/packages/document-api/src/format/inline-run-patch.ts
+++ b/packages/document-api/src/format/inline-run-patch.ts
@@ -221,13 +221,14 @@ const markTextStyleValue = (
   type: InlinePropertyType,
   ooxmlElement: string,
   schema: Record<string, unknown>,
+  textStyleAttr?: string,
 ): InlinePropertyRegistryEntry => ({
   key,
   type,
   ooxmlElement,
   storage: 'mark',
   tracked: true,
-  carrier: markCarrier('textStyle', key),
+  carrier: markCarrier('textStyle', textStyleAttr ?? key),
   schema,
 });
 
@@ -279,7 +280,7 @@ export const INLINE_PROPERTY_REGISTRY = [
   markTextStyleValue('position', 'number', 'w:position', schemaNumberOrNull()),
   runAttribute('dstrike', 'boolean', 'w:dstrike', schemaBooleanOrNull()),
   runAttribute('smallCaps', 'boolean', 'w:smallCaps', schemaBooleanOrNull()),
-  runAttribute('caps', 'boolean', 'w:caps', schemaBooleanOrNull()),
+  markTextStyleValue('caps', 'boolean', 'w:caps', schemaBooleanOrNull(), 'textTransform'),
   runAttribute(
     'shading',
     'object',
diff --git a/packages/super-editor/src/document-api-adapters/plan-engine/executor.ts b/packages/super-editor/src/document-api-adapters/plan-engine/executor.ts
index 5848d9882c..551b454ccf 100644
--- a/packages/super-editor/src/document-api-adapters/plan-engine/executor.ts
+++ b/packages/super-editor/src/document-api-adapters/plan-engine/executor.ts
@@ -122,7 +122,10 @@ function buildMarksFromSetMarks(editor: Editor, setMarks?: SetMarks): readonly P
 
 type InlineRunPatch = StyleApplyInput['inline'];
 type TextStylePatchKey = 'color' | 'fontSize' | 'letterSpacing' | 'vertAlign' | 'position';
-type TextStylePatch = Partial<Pick<InlineRunPatch, TextStylePatchKey>>;
+type TextStylePatch = Partial<Pick<InlineRunPatch, TextStylePatchKey>> & {
+  /** Derived from `caps` boolean — mapped to the textStyle mark's `textTransform` attribute. */
+  textTransform?: string | null;
+};
 
 interface InlineTextSegment {
   from: number;
@@ -161,6 +164,11 @@ function toHalfPoints(value: number): number {
   return Math.round(value * 2);
 }
 
+function capsToTextTransform(caps: boolean | null): string | null {
+  if (caps === null) return null;
+  return caps ? 'uppercase' : 'none';
+}
+
 function collectInlineTextSegments(doc: ProseMirrorNode, absFrom: number, absTo: number): InlineTextSegment[] {
   const segments: InlineTextSegment[] = [];
 
@@ -233,8 +241,7 @@ function applyHighlightPatch(
 function mergeTextStyleAttrs(currentAttrs: Record<string, unknown>, patch: TextStylePatch): Record<string, unknown> {
   const next = { ...currentAttrs };
 
-  for (const key of TEXT_STYLE_KEYS) {
-    const value = patch[key];
+  for (const [key, value] of Object.entries(patch)) {
     if (value === undefined) continue;
 
     if (value === null) {
@@ -251,7 +258,7 @@ function mergeTextStyleAttrs(currentAttrs: Record<string, unknown>, patch: TextS
       continue;
     }
 
-    next[key] = value as string;
+    next[key] = value;
   }
 
   return compactAttrs(next);
@@ -613,6 +620,9 @@ function applyInlinePatchToRange(
       (textStylePatch as Record<string, unknown>)[key] = inline[key];
     }
   }
+  if (inline.caps !== undefined) {
+    textStylePatch.textTransform = capsToTextTransform(inline.caps ?? null);
+  }
   if (applyTextStylePatch(tr, schema.marks.textStyle, absFrom, absTo, textStylePatch)) {
     changed = true;
   }