diff --git a/packages/app/e2e/browser/changes-pane.spec.ts b/packages/app/e2e/browser/changes-pane.spec.ts
index 6d8acc05d3..61173613ea 100644
--- a/packages/app/e2e/browser/changes-pane.spec.ts
+++ b/packages/app/e2e/browser/changes-pane.spec.ts
@@ -262,24 +262,74 @@ test.afterEach(async () => {
   }
 });
 
-test("Changes opens the populated committed comparison for a clean checkout", async ({ page }) => {
+test("Changes opens All changes for a clean checkout", async ({ page }) => {
   const workspace = await createWorkspaceWithCommittedDiff();
 
   await openWorkspaceChangesSurface(page, workspace, 90_000);
 
   const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
   const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
-  await expect(tree.getByTestId("changes-diff-status-trigger")).toContainText("Committed");
+  await expect(tree.getByTestId("changes-diff-status-trigger")).toContainText("All changes");
   await expect(panel.getByTestId("diff-file-0")).toHaveAccessibleName("committed-only.ts, +1, -0");
 });
 
-test("Changes expires a manual comparison when checkout dirtiness changes", async ({ page }) => {
+test("All changes combines committed and pending edits and preserves an unfinished review", async ({
+  page,
+  context,
+}) => {
+  const workspace = await createWorkspaceWithNetDiff();
+  await context.grantPermissions(["clipboard-read", "clipboard-write"]);
+  await configureDiffPresentation(page, { layout: "unified", wrapLines: false });
+  await openWorkspaceChangesSurface(page, workspace);
+  const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
+  const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
+  const mode = tree.getByRole("button", { name: "Diff mode", exact: true });
+  await expect(mode).toContainText("All changes");
+  await expectNetComparisonFiles(page, ["a-tracked.ts", "b-committed.ts"]);
+  await expectRenderedAddedLine(page, "committed");
+
+  await test.step("an unfinished review survives the first dirty edit", async () => {
+    await startReviewOnFirstChangedLine(page);
+    await page
+      .getByRole("textbox", { name: "Review comment" })
+      .fill("Unfinished review stays here");
+    await writeFile(path.join(workspace.repoPath, "c-untracked.txt"), "untracked\n");
+    await expectNetComparisonFiles(page, ["a-tracked.ts", "b-committed.ts", "c-untracked.txt"]);
+    await expect(mode).toContainText("All changes");
+    await expect(page.getByRole("textbox", { name: "Review comment" })).toHaveValue(
+      "Unfinished review stays here",
+    );
+    await cancelInlineReview(page);
+  });
+  await test.step("pending edits form a live net patch over the committed edit", async () => {
+    await writeFile(path.join(workspace.repoPath, "a-tracked.ts"), "working\n");
+    await expectRenderedAddedLine(page, "working");
+    await expect(panel.getByTestId("diff-file-0")).toHaveAccessibleName("a-tracked.ts, +1, -1");
+  });
+  await test.step("committing the same contents preserves the rendered comparison", async () => {
+    execFileSync("git", ["add", "--all"], { cwd: workspace.repoPath });
+    execFileSync("git", ["commit", "-m", "Commit pending changes"], { cwd: workspace.repoPath });
+    await expect(page.getByTestId("changes-primary-cta")).toContainText("Merge", {
+      timeout: 30_000,
+    });
+    await expect(mode).toContainText("All changes");
+    await expectNetComparisonFiles(page, ["a-tracked.ts", "b-committed.ts", "c-untracked.txt"]);
+    await expectRenderedAddedLine(page, "working");
+  });
+  await test.step("undoing to the comparison base removes the net change", async () => {
+    await writeFile(path.join(workspace.repoPath, "a-tracked.ts"), "base\n");
+    await expectNetComparisonFiles(page, ["b-committed.ts", "c-untracked.txt"]);
+    await expect(mode).toContainText("All changes");
+  });
+});
+
+test("Changes keeps a manual comparison when checkout dirtiness changes", async ({ page }) => {
   const workspace = await createWorkspaceWithMountedTabDiff();
   await openWorkspaceChanges(page, workspace);
 
   const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
   const mode = tree.getByTestId("changes-diff-status-trigger");
-  await expect(mode).toContainText("Uncommitted");
+  await expect(mode).toContainText("All changes");
 
   await mode.click();
   await page.getByTestId("changes-diff-mode-committed").click();
@@ -294,7 +344,23 @@ test("Changes expires a manual comparison when checkout dirtiness changes", asyn
   });
 
   await writeFile(path.join(workspace.repoPath, "new-working-change.txt"), "uncommitted\n");
-  await expect(mode).toContainText("Uncommitted", { timeout: 30_000 });
+  await expect(tree.getByRole("button", { name: "See uncommitted changes" })).toBeVisible({
+    timeout: 30_000,
+  });
+  await expect(mode).toContainText("Committed");
+
+  await selectChangesComparison(page, "Uncommitted");
+  execFileSync("git", ["add", "--all"], { cwd: workspace.repoPath });
+  execFileSync("git", ["commit", "-m", "Commit new working change"], { cwd: workspace.repoPath });
+  await expect(tree.getByText("No changes to display", { exact: true })).toBeVisible({
+    timeout: 30_000,
+  });
+  await expect(mode).toContainText("Uncommitted");
+  await writeFile(path.join(workspace.repoPath, "another-working-change.txt"), "pending\n");
+  await expect(tree.getByText("another-working-change.txt", { exact: true })).toBeVisible({
+    timeout: 30_000,
+  });
+  await expect(mode).toContainText("Uncommitted");
 });
 
 test("an empty Changes comparison links to the populated comparison", async ({ page }) => {
@@ -633,6 +699,7 @@ test("changes context menus expose folder revert and restore a file after confir
   const workspace = await createWorkspaceWithMountedTabDiff();
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
+  await selectChangesComparison(page, "Uncommitted");
 
   const tree = changesTree(page);
   await tree.getByTestId("diff-folder-src-toggle").click({ button: "right" });
@@ -680,6 +747,7 @@ test("discarding a staged rename restores its source path", async ({ page }) =>
   const workspace = await createWorkspaceWithMountedTabDiff({ includeRenamedFile: true });
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
+  await selectChangesComparison(page, "Uncommitted");
 
   const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
   const renamedHeader = diffHeaderForPath(panel, "src/zz-renamed.ts");
@@ -710,6 +778,7 @@ test("discarding an untracked file removes it from the working tree", async ({ p
   const workspace = await createWorkspaceWithMountedTabDiff({ includeUntrackedFile: true });
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
+  await selectChangesComparison(page, "Uncommitted");
 
   const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
   const untrackedHeader = diffHeaderForPath(panel, "zz-untracked.txt");
@@ -741,6 +810,7 @@ test("shows a revert error returned by the daemon", async ({ page }) => {
   await failNextDiscardRequest(page);
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
+  await selectChangesComparison(page, "Uncommitted");
 
   await page.getByTestId("diff-file-0-toggle").click({ button: "right" });
   const confirmation = new Promise<void>((resolve) => {
@@ -892,6 +962,8 @@ test("compact Explorer renders inline hunks with a saved tree-only desktop prefe
     { key: CHANGES_PREFERENCES_KEY },
   );
   const explorer = await openCompactChanges(page, workspace);
+  await explorer.getByRole("button", { name: "Diff mode", exact: true }).click();
+  await page.getByRole("menuitem", { name: "Uncommitted", exact: true }).click();
   await expect(explorer.getByTestId("git-diff-canvas")).toBeVisible();
   await expect(explorer.getByTestId("diff-file-0-toggle")).toBeVisible();
   await explorer.getByTestId("diff-file-0-toggle").click({ button: "right" });
@@ -1525,6 +1597,64 @@ async function createWorkspaceWithMountedTabDiff(
   return { id: createdWorkspace.workspace.id, repoPath: repo.path };
 }
 
+async function createWorkspaceWithNetDiff(): Promise<DirtyWorkspace> {
+  const repo = await createTempGitRepo("changes-net-", {
+    files: [{ path: "a-tracked.ts", content: "base\n" }],
+  });
+  const client = await connectSeedClient();
+  cleanupTasks.push({
+    run: async () => {
+      await client.close();
+      await repo.cleanup();
+    },
+  });
+  execFileSync("git", ["checkout", "-b", "feature"], { cwd: repo.path });
+  await writeFile(path.join(repo.path, "a-tracked.ts"), "committed\n");
+  await writeFile(path.join(repo.path, "b-committed.ts"), "committed only\n");
+  execFileSync("git", ["add", "--all"], { cwd: repo.path });
+  execFileSync("git", ["commit", "-m", "Committed changes"], { cwd: repo.path });
+  const created = await client.createWorkspace({ source: { kind: "directory", path: repo.path } });
+  if (!created.workspace) throw new Error(created.error ?? "Failed to create net diff workspace");
+  return { id: created.workspace.id, repoPath: repo.path };
+}
+
+async function expectNetComparisonFiles(page: Page, files: string[]): Promise<void> {
+  const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
+  const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
+  await expect(tree.locator('[data-testid^="diff-tree-file-"][data-testid$="-name"]')).toHaveText(
+    files,
+  );
+  await expect(panel.getByTestId(/^diff-file-\d+$/)).toHaveCount(files.length);
+  for (const file of files) {
+    await expect(diffHeaderForPath(panel, file)).toBeVisible();
+  }
+}
+
+async function expectRenderedAddedLine(page: Page, contents: string): Promise<void> {
+  await changesTree(page).getByText("a-tracked.ts", { exact: true }).click();
+  await expect(async () => {
+    await page.keyboard.press("Escape");
+    await page.evaluate(() => navigator.clipboard.writeText(""));
+    const body = page.getByTestId("diff-file-0-body");
+    const canvas = page.getByTestId("git-diff-canvas");
+    const bounds = await body.boundingBox();
+    if (!bounds) throw new Error("Expanded diff body has no bounds");
+    const fontSize = await canvas.evaluate((element) =>
+      Number.parseFloat(getComputedStyle(element).fontSize),
+    );
+    // Replacement: hunk header, removed line, added line.
+    await page.mouse.click(bounds.x + 120, bounds.y + Math.round(fontSize * 1.5) * 2.5, {
+      button: "right",
+    });
+    const copyLine = page.getByRole("menuitem", { name: "Copy line", exact: true });
+    await expect(copyLine).toBeEnabled({ timeout: 1000 });
+    await copyLine.click();
+    await expect
+      .poll(() => page.evaluate(() => navigator.clipboard.readText()), { timeout: 1000 })
+      .toBe(contents);
+  }).toPass({ timeout: 15_000 });
+}
+
 async function createWorkspaceWithCommittedDiff(): Promise<DirtyWorkspace> {
   const repo = await createTempGitRepo("changes-committed-", {
     files: [{ path: "tracked.ts", content: "export const tracked = 1;\n" }],
diff --git a/packages/app/src/data/push-router.test.ts b/packages/app/src/data/push-router.test.ts
index 3bf9e99f9b..6599c28467 100644
--- a/packages/app/src/data/push-router.test.ts
+++ b/packages/app/src/data/push-router.test.ts
@@ -51,7 +51,7 @@ function createFakeClient(config: { rejectCheckoutDiffSubscribe?: boolean } = {}
   emit: <K extends RouterMessageType>(message: Extract<RouterMessage, { type: K }>) => void;
   subscribeCheckoutDiffCalls: Array<{
     cwd: string;
-    compare: { mode: "uncommitted" | "base"; baseRef?: string; ignoreWhitespace?: boolean };
+    compare: { mode: "uncommitted" | "base" | "all"; baseRef?: string; ignoreWhitespace?: boolean };
     subscriptionId: string;
   }>;
   unsubscribeCheckoutDiffCalls: string[];
@@ -67,7 +67,7 @@ function createFakeClient(config: { rejectCheckoutDiffSubscribe?: boolean } = {}
   };
   const subscribeCheckoutDiffCalls: Array<{
     cwd: string;
-    compare: { mode: "uncommitted" | "base"; baseRef?: string; ignoreWhitespace?: boolean };
+    compare: { mode: "uncommitted" | "base" | "all"; baseRef?: string; ignoreWhitespace?: boolean };
     subscriptionId: string;
   }> = [];
   const unsubscribeCheckoutDiffCalls: string[] = [];
@@ -379,12 +379,12 @@ describe("server data push router", () => {
       });
   });
 
-  it("subscribes active checkout diff queries and writes matching diff events", () => {
+  it.each(["base", "all"] as const)("routes %s diff snapshots and updates", (mode) => {
     const queryClient = new QueryClient();
     const fake = createFakeClient();
     const serverId = "server-1";
     const cwd = "/repo";
-    const queryKey = checkoutDiffQueryKey(serverId, cwd, "base", "main", true);
+    const queryKey = checkoutDiffQueryKey(serverId, cwd, mode, "main", true);
     const subscriptionId = `checkoutDiff:${JSON.stringify(queryKey)}`;
     const observer = new QueryObserver(queryClient, {
       queryKey,
@@ -397,17 +397,18 @@ describe("server data push router", () => {
         serverId,
         subscriptionId,
         cwd,
-        compare: { mode: "base", baseRef: "main", ignoreWhitespace: true },
+        compare: { mode, baseRef: "main", ignoreWhitespace: true },
       }),
     });
     const unsubscribeObserver = observer.subscribe(() => undefined);
     const unmount = mountServerDataPushRouter({ client: fake.client, queryClient, serverId });
 
+    expect(fake.subscribeCheckoutDiffCalls).toHaveLength(1);
     const serverSubscriptionId = fake.subscribeCheckoutDiffCalls[0]!.subscriptionId;
     expect(fake.subscribeCheckoutDiffCalls).toEqual([
       {
         cwd,
-        compare: { mode: "base", baseRef: "main", ignoreWhitespace: true },
+        compare: { mode, baseRef: "main", ignoreWhitespace: true },
         subscriptionId: serverSubscriptionId,
       },
     ]);
diff --git a/packages/app/src/data/push-router.ts b/packages/app/src/data/push-router.ts
index 5ab3069bd0..75ac313169 100644
--- a/packages/app/src/data/push-router.ts
+++ b/packages/app/src/data/push-router.ts
@@ -33,7 +33,7 @@ type CheckoutDiffCachePayload = Omit<CheckoutDiffResponsePayload, "subscriptionI
 type ListTerminalsPayload = ListTerminalsResponse["payload"];
 
 interface CheckoutDiffCompare {
-  mode: "uncommitted" | "base";
+  mode: "uncommitted" | "base" | "all";
   baseRef?: string;
   ignoreWhitespace?: boolean;
 }
@@ -655,7 +655,7 @@ function readCheckoutDiffCompare(value: unknown): CheckoutDiffCompare | null {
   const mode = value.mode;
   const baseRef = value.baseRef;
   const ignoreWhitespace = value.ignoreWhitespace;
-  if (mode !== "uncommitted" && mode !== "base") {
+  if (mode !== "uncommitted" && mode !== "base" && mode !== "all") {
     return null;
   }
   if (baseRef !== undefined && typeof baseRef !== "string") {
diff --git a/packages/app/src/git/checkout-status-cache.test.ts b/packages/app/src/git/checkout-status-cache.test.ts
index ba4ddd2429..026ec9d43a 100644
--- a/packages/app/src/git/checkout-status-cache.test.ts
+++ b/packages/app/src/git/checkout-status-cache.test.ts
@@ -92,12 +92,11 @@ function checkoutStatusUpdate(
   };
 }
 
-function selectBaseComparison(isDirtyAtSelection: boolean): void {
+function selectBaseComparison(): void {
   selectWorkingDiffComparison({
     serverId,
     cwd,
     comparison: "base",
-    isDirty: isDirtyAtSelection,
   });
 }
 
@@ -120,14 +119,13 @@ describe("fetchCheckoutStatus", () => {
     expect(client.getCheckoutStatus).toHaveBeenCalledExactlyOnceWith(cwd);
   });
 
-  it("expires a manual working-diff comparison when the fetched dirty state flipped", async () => {
-    selectBaseComparison(true);
+  it("keeps a manual working-diff comparison when the fetched dirty state flips", async () => {
+    selectBaseComparison();
     const client = { getCheckoutStatus: vi.fn(async () => checkoutStatus({ isDirty: false })) };
 
     await fetchCheckoutStatus({ client, serverId, cwd });
 
-    expect(resolveWorkingDiffComparison({ serverId, cwd, isDirty: false })).toBe("base");
-    expect(resolveWorkingDiffComparison({ serverId, cwd, isDirty: true })).toBe("uncommitted");
+    expect(resolveWorkingDiffComparison({ serverId, cwd })).toBe("base");
   });
 });
 
@@ -286,31 +284,25 @@ describe("applyCheckoutStatusUpdateFromEvent", () => {
     ).toBe("unauthenticated");
   });
 
-  it("expires a manual working-diff comparison when the pushed dirty state flipped", () => {
-    const queryClient = createQueryClient();
-    selectBaseComparison(false);
-
-    applyCheckoutStatusUpdateFromEvent({
-      queryClient,
-      serverId,
-      message: checkoutStatusUpdate(checkoutStatus({ isDirty: true })),
-    });
-
-    expect(resolveWorkingDiffComparison({ serverId, cwd, isDirty: true })).toBe("uncommitted");
-  });
-
-  it("keeps a manual working-diff comparison while the pushed dirty state still matches", () => {
-    const queryClient = createQueryClient();
-    selectBaseComparison(true);
-
-    applyCheckoutStatusUpdateFromEvent({
-      queryClient,
-      serverId,
-      message: checkoutStatusUpdate(checkoutStatus({ isDirty: true })),
-    });
-
-    expect(resolveWorkingDiffComparison({ serverId, cwd, isDirty: true })).toBe("base");
-  });
+  it.each(["base", "uncommitted"] as const)(
+    "keeps %s selected across dirty and clean pushes",
+    (comparison) => {
+      const queryClient = createQueryClient();
+      selectWorkingDiffComparison({ serverId, cwd, comparison });
+      applyCheckoutStatusUpdateFromEvent({
+        queryClient,
+        serverId,
+        message: checkoutStatusUpdate(checkoutStatus({ isDirty: true })),
+      });
+      expect(resolveWorkingDiffComparison({ serverId, cwd })).toBe(comparison);
+      applyCheckoutStatusUpdateFromEvent({
+        queryClient,
+        serverId,
+        message: checkoutStatusUpdate(checkoutStatus({ isDirty: false })),
+      });
+      expect(resolveWorkingDiffComparison({ serverId, cwd })).toBe(comparison);
+    },
+  );
 
   it("invalidates PR detail queries when the prStatus changes, ignoring the volatile requestId", () => {
     const queryClient = createQueryClient();
diff --git a/packages/app/src/git/checkout-status-cache.ts b/packages/app/src/git/checkout-status-cache.ts
index c06499fef5..ca5cbb3a7a 100644
--- a/packages/app/src/git/checkout-status-cache.ts
+++ b/packages/app/src/git/checkout-status-cache.ts
@@ -9,7 +9,6 @@ import {
 } from "@/git/query-keys";
 import { type CheckoutPrStatusPayload, normalizeCheckoutPrStatusPayload } from "@/git/pr-status";
 import { resetDraftAgentCommandsForCheckout } from "@/hooks/agent-commands-query";
-import { expireWorkingDiffComparisons } from "@/git/working-diff-comparison";
 
 export type CheckoutStatusPayload = CheckoutStatusResponse["payload"];
 export type { CheckoutPrStatusPayload } from "@/git/pr-status";
@@ -18,13 +17,8 @@ export interface CheckoutStatusClient {
   getCheckoutStatus: (cwd: string) => Promise<CheckoutStatusPayload>;
 }
 
-// Checkout status enters the app through exactly two doors: daemon pushes
-// (applyCheckoutStatusUpdateFromEvent) and query fetches (fetchCheckoutStatus). Both run
-// the dirty-state reactions, so they hold regardless of which screens are mounted.
-
 export async function fetchCheckoutStatus({
   client,
-  serverId,
   cwd,
 }: {
   client: CheckoutStatusClient;
@@ -32,7 +26,6 @@ export async function fetchCheckoutStatus({
   cwd: string;
 }): Promise<CheckoutStatusPayload> {
   const payload = await client.getCheckoutStatus(cwd);
-  expireWorkingDiffComparisons({ serverId, cwd, isDirty: payload.isGit && payload.isDirty });
   return payload;
 }
 
@@ -78,11 +71,6 @@ export function applyCheckoutStatusUpdateFromEvent({
   void queryClient.invalidateQueries({
     queryKey: checkoutCommitsQueryKey(serverId, payload.cwd),
   });
-  expireWorkingDiffComparisons({
-    serverId,
-    cwd: payload.cwd,
-    isDirty: payload.isGit && payload.isDirty,
-  });
 
   if (!prStatus) {
     return;
diff --git a/packages/app/src/git/diff-pane.tsx b/packages/app/src/git/diff-pane.tsx
index 22a5c2df05..3dd84f256a 100644
--- a/packages/app/src/git/diff-pane.tsx
+++ b/packages/app/src/git/diff-pane.tsx
@@ -133,7 +133,7 @@ function useDiscardChangesAction({
 }: {
   serverId: string;
   cwd: string;
-  diffMode: "uncommitted" | "base";
+  diffMode: "uncommitted" | "base" | "all";
 }): ((path: string, oldPath?: string) => void) | undefined {
   const { t } = useTranslation();
   const toast = useToast();
@@ -281,11 +281,12 @@ export function DiffLayoutToggle({
 }
 
 interface DiffModeMenuProps {
-  diffMode: "uncommitted" | "base";
+  diffMode: "uncommitted" | "base" | "all";
   committedDescription?: string;
   testIDPrefix?: string;
   onSelectUncommitted: () => void;
   onSelectBase: () => void;
+  onSelectAll: () => void;
 }
 
 export function DiffModeMenu({
@@ -294,10 +295,12 @@ export function DiffModeMenu({
   testIDPrefix = "changes-diff",
   onSelectUncommitted,
   onSelectBase,
+  onSelectAll,
 }: DiffModeMenuProps) {
   const { t } = useTranslation();
   const uncommittedLabel = t("workspace.git.diff.uncommitted");
   const committedLabel = t("workspace.git.diff.committed");
+  const allLabel = t("workspace.git.diff.all");
   return (
     <DropdownMenu>
       <DropdownMenuTrigger
@@ -311,7 +314,7 @@ export function DiffModeMenu({
           return (
             <>
               <Text style={toolbarLabelTriggerTextStyle(highlighted)} numberOfLines={1}>
-                {diffMode === "uncommitted" ? uncommittedLabel : committedLabel}
+                {{ all: allLabel, uncommitted: uncommittedLabel, base: committedLabel }[diffMode]}
               </Text>
               <ToolbarLabelTriggerIcon>
                 <ThemedChevronDown size={12} uniProps={extraMutedIconColorMapping} />
@@ -321,6 +324,14 @@ export function DiffModeMenu({
         }}
       </DropdownMenuTrigger>
       <DropdownMenuContent align="start" width={260} testID={`${testIDPrefix}-status-menu`}>
+        <DropdownMenuItem
+          testID={`${testIDPrefix}-mode-all`}
+          selected={diffMode === "all"}
+          onSelect={onSelectAll}
+        >
+          {allLabel}
+        </DropdownMenuItem>
+        <DropdownMenuSeparator />
         <DropdownMenuItem
           testID={`${testIDPrefix}-mode-uncommitted`}
           selected={diffMode === "uncommitted"}
@@ -469,10 +480,11 @@ interface ChangesRepositoryToolbarModel {
 
 interface ChangesComparisonToolbarModel {
   committedDescription?: string;
-  diffMode: "uncommitted" | "base";
+  diffMode: "uncommitted" | "base" | "all";
   mode: ChangesToolbarMode;
   selectedDiffStat: { additions: number; deletions: number } | null;
   onSelectBase: () => void;
+  onSelectAll: () => void;
   onSelectUncommitted: () => void;
 }
 
@@ -488,11 +500,12 @@ interface BuildChangesHeaderModelInput {
   committedDescription?: string;
   compact: boolean;
   cwd: string;
-  diffMode: "uncommitted" | "base";
+  diffMode: "uncommitted" | "base" | "all";
   gitActions: GitActions;
   mode: ChangesToolbarMode;
   onOpenPullRequest: () => void;
   onSelectBase: () => void;
+  onSelectAll: () => void;
   onSelectUncommitted: () => void;
   pullRequest: PrHint | null;
   selectedDiffStat: { additions: number; deletions: number } | null;
@@ -521,6 +534,7 @@ function buildChangesHeaderModel(input: BuildChangesHeaderModelInput): {
       mode: input.mode,
       selectedDiffStat: input.selectedDiffStat,
       onSelectBase: input.onSelectBase,
+      onSelectAll: input.onSelectAll,
       onSelectUncommitted: input.onSelectUncommitted,
     },
   };
@@ -737,6 +751,7 @@ function ChangesComparisonToolbar({
           committedDescription={model.committedDescription}
           onSelectUncommitted={model.onSelectUncommitted}
           onSelectBase={model.onSelectBase}
+          onSelectAll={model.onSelectAll}
         />
         {model.selectedDiffStat ? (
           <DiffStat
@@ -1155,7 +1170,7 @@ interface ChangesEmptyAction {
 
 function computeChangesEmptyAction(input: {
   hideWhitespace: boolean;
-  diffMode: "uncommitted" | "base";
+  diffMode: "uncommitted" | "base" | "all";
   status: CheckoutStatusPayload | null;
   seeUncommittedLabel: string;
   seeCommittedLabel: string;
@@ -1544,6 +1559,7 @@ export function ChangesSurface({
     diffMode,
     selectUncommitted: handleSelectUncommitted,
     selectBase: handleSelectBase,
+    selectAll: handleSelectAll,
     files,
     diffPayloadError,
     diffTooLarge,
@@ -1897,6 +1913,7 @@ export function ChangesSurface({
         mode: toolbarMode,
         onOpenPullRequest: handleOpenPullRequest,
         onSelectBase: handleSelectBase,
+        onSelectAll: handleSelectAll,
         onSelectUncommitted: handleSelectUncommitted,
         pullRequest: selectPrHintFromStatus(pullRequestStatus, forge),
         selectedDiffStat,
@@ -1911,6 +1928,7 @@ export function ChangesSurface({
       gitActions,
       handleOpenPullRequest,
       handleSelectBase,
+      handleSelectAll,
       handleSelectUncommitted,
       isMobile,
       forge,
diff --git a/packages/app/src/git/query-keys.ts b/packages/app/src/git/query-keys.ts
index cfd804e459..08a0a1cb4a 100644
--- a/packages/app/src/git/query-keys.ts
+++ b/packages/app/src/git/query-keys.ts
@@ -24,7 +24,7 @@ export function checkoutStatusQueryKey(serverId: string, cwd: string) {
 export function checkoutDiffQueryKey(
   serverId: string,
   cwd: string,
-  mode: "uncommitted" | "base",
+  mode: "uncommitted" | "base" | "all",
   baseRef?: string,
   ignoreWhitespace?: boolean,
 ) {
diff --git a/packages/app/src/git/use-diff-query.ts b/packages/app/src/git/use-diff-query.ts
index 091d053307..ebfcd4c354 100644
--- a/packages/app/src/git/use-diff-query.ts
+++ b/packages/app/src/git/use-diff-query.ts
@@ -1,4 +1,5 @@
 import { shareCheckoutDiff } from "./diff-sharing";
+import { useSessionStore } from "@/stores/session-store";
 import { useMemo } from "react";
 import { useRetainedPanelActive } from "@/components/retained-panel";
 import { useReplicaQuery } from "@/data/query";
@@ -10,7 +11,7 @@ import { checkoutDiffQueryKey } from "@/git/query-keys";
 interface UseCheckoutDiffQueryOptions {
   serverId: string;
   cwd: string;
-  mode: "uncommitted" | "base";
+  mode: "uncommitted" | "base" | "all";
   baseRef?: string;
   ignoreWhitespace?: boolean;
   enabled?: boolean;
@@ -26,18 +27,18 @@ export type DiffLine = DiffHunk["lines"][number];
 export type HighlightToken = NonNullable<DiffLine["tokens"]>[number];
 
 function normalizeCheckoutDiffCompare(compare: {
-  mode: "uncommitted" | "base";
+  mode: "uncommitted" | "base" | "all";
   baseRef?: string;
   ignoreWhitespace?: boolean;
-}): { mode: "uncommitted" | "base"; baseRef?: string; ignoreWhitespace?: boolean } {
+}): { mode: "uncommitted" | "base" | "all"; baseRef?: string; ignoreWhitespace?: boolean } {
   const ignoreWhitespace = compare.ignoreWhitespace === true;
   if (compare.mode === "uncommitted") {
     return { mode: "uncommitted", ignoreWhitespace };
   }
   const trimmedBaseRef = compare.baseRef?.trim();
   return trimmedBaseRef
-    ? { mode: "base", baseRef: trimmedBaseRef, ignoreWhitespace }
-    : { mode: "base", ignoreWhitespace };
+    ? { mode: compare.mode, baseRef: trimmedBaseRef, ignoreWhitespace }
+    : { mode: compare.mode, ignoreWhitespace };
 }
 
 export function useCheckoutDiffQuery({
@@ -49,6 +50,11 @@ export function useCheckoutDiffQuery({
   enabled = true,
   queryScope,
 }: UseCheckoutDiffQueryOptions) {
+  // COMPAT(checkoutDiffAll): added in v0.12.0, remove after 2027-04-21 once host floor includes All changes.
+  const allSupported = useSessionStore(
+    (state) => state.sessions[serverId]?.serverInfo?.features?.checkoutDiffAll === true,
+  );
+  const requiresUpdate = mode === "all" && !allSupported;
   const retainedPanelActive = useRetainedPanelActive();
   const queryEnabled = enabled && retainedPanelActive;
   const isConnected = useHostRuntimeIsConnected(serverId);
@@ -71,7 +77,7 @@ export function useCheckoutDiffQuery({
     return normalizedScope ? [...comparisonKey, "scope", normalizedScope] : comparisonKey;
   }, [serverId, cwd, compareMode, compareBaseRef, compareIgnoreWhitespace, queryScope]);
   const subscriptionId = useMemo(() => `checkoutDiff:${JSON.stringify(queryKey)}`, [queryKey]);
-  const routeEnabled = Boolean(queryEnabled && isConnected && cwd);
+  const routeEnabled = Boolean(queryEnabled && isConnected && cwd && !requiresUpdate);
 
   const query = useReplicaQuery<CheckoutDiffQueryPayload>({
     queryKey,
@@ -91,7 +97,16 @@ export function useCheckoutDiffQuery({
     }),
   });
 
-  return deriveCheckoutDiffResult(query.data ?? null);
+  return deriveCheckoutDiffResult(
+    requiresUpdate && isConnected
+      ? {
+          requestId: "unsupported",
+          cwd,
+          files: [],
+          error: { code: "UNKNOWN", message: "Update the host to view All changes" },
+        }
+      : (query.data ?? null),
+  );
 }
 
 export interface CheckoutDiffResult {
diff --git a/packages/app/src/git/use-working-diff.ts b/packages/app/src/git/use-working-diff.ts
index daeda1479d..f835d44f53 100644
--- a/packages/app/src/git/use-working-diff.ts
+++ b/packages/app/src/git/use-working-diff.ts
@@ -45,7 +45,6 @@ export function useWorkingDiff({
     status?.error?.message ??
     (isStatusError && statusError instanceof Error ? statusError.message : null);
   const baseRef = gitStatus?.baseRef ?? undefined;
-  const hasUncommittedChanges = Boolean(gitStatus?.isDirty);
   const currentBranchName =
     gitStatus?.currentBranch && gitStatus.currentBranch !== "HEAD" ? gitStatus.currentBranch : null;
 
@@ -53,9 +52,9 @@ export function useWorkingDiff({
     serverId,
     workspaceId,
     cwd,
-    isDirty: hasUncommittedChanges,
   });
   const selectUncommitted = useCallback(() => selectComparison("uncommitted"), [selectComparison]);
+  const selectAll = useCallback(() => selectComparison("all"), [selectComparison]);
   const selectBase = useCallback(() => selectComparison("base"), [selectComparison]);
 
   const {
@@ -111,6 +110,7 @@ export function useWorkingDiff({
     diffMode,
     selectUncommitted,
     selectBase,
+    selectAll,
     files,
     diffPayloadError,
     diffTooLarge,
diff --git a/packages/app/src/git/working-diff-comparison/index.ts b/packages/app/src/git/working-diff-comparison/index.ts
index bee2c81b22..84a4b461d2 100644
--- a/packages/app/src/git/working-diff-comparison/index.ts
+++ b/packages/app/src/git/working-diff-comparison/index.ts
@@ -1,7 +1,6 @@
 import { useCallback } from "react";
 import { create } from "zustand";
 import {
-  expireWorkingDiffComparisonsInState,
   resolveWorkingDiffComparisonFromState,
   selectWorkingDiffComparisonInState,
   type WorkingDiffCheckoutIdentity,
@@ -13,7 +12,6 @@ interface WorkingDiffComparisonStore extends WorkingDiffComparisonState {
   select: (
     input: WorkingDiffCheckoutIdentity & {
       comparison: WorkingDiffComparison;
-      isDirty: boolean;
     },
   ) => void;
 }
@@ -23,21 +21,18 @@ const useWorkingDiffComparisonStore = create<WorkingDiffComparisonStore>((set) =
   select: (input) => set((state) => selectWorkingDiffComparisonInState(state, input)),
 }));
 
-export function useWorkingDiffComparison(
-  input: WorkingDiffCheckoutIdentity & { isDirty: boolean },
-): {
+export function useWorkingDiffComparison(input: WorkingDiffCheckoutIdentity): {
   comparison: WorkingDiffComparison;
   selectComparison: (comparison: WorkingDiffComparison) => void;
 } {
-  const { serverId, workspaceId, cwd, isDirty } = input;
+  const { serverId, workspaceId, cwd } = input;
   const comparison = useWorkingDiffComparisonStore((state) =>
-    resolveWorkingDiffComparisonFromState(state, { serverId, workspaceId, cwd, isDirty }),
+    resolveWorkingDiffComparisonFromState(state, { serverId, workspaceId, cwd }),
   );
   const select = useWorkingDiffComparisonStore((state) => state.select);
   const selectComparison = useCallback(
-    (next: WorkingDiffComparison) =>
-      select({ serverId, workspaceId, cwd, isDirty, comparison: next }),
-    [cwd, isDirty, select, serverId, workspaceId],
+    (next: WorkingDiffComparison) => select({ serverId, workspaceId, cwd, comparison: next }),
+    [cwd, select, serverId, workspaceId],
   );
   return { comparison, selectComparison };
 }
@@ -45,28 +40,17 @@ export function useWorkingDiffComparison(
 export function selectWorkingDiffComparison(
   input: WorkingDiffCheckoutIdentity & {
     comparison: WorkingDiffComparison;
-    isDirty: boolean;
   },
 ): void {
   useWorkingDiffComparisonStore.getState().select(input);
 }
 
 export function resolveWorkingDiffComparison(
-  input: WorkingDiffCheckoutIdentity & { isDirty: boolean },
+  input: WorkingDiffCheckoutIdentity,
 ): WorkingDiffComparison {
   return resolveWorkingDiffComparisonFromState(useWorkingDiffComparisonStore.getState(), input);
 }
 
-export function expireWorkingDiffComparisons(input: {
-  serverId: string;
-  cwd: string;
-  isDirty: boolean;
-}): void {
-  useWorkingDiffComparisonStore.setState((state) =>
-    expireWorkingDiffComparisonsInState(state, input),
-  );
-}
-
 export function resetWorkingDiffComparisons(): void {
   useWorkingDiffComparisonStore.setState({ overrides: {} });
 }
diff --git a/packages/app/src/git/working-diff-comparison/state.test.ts b/packages/app/src/git/working-diff-comparison/state.test.ts
index f86038bdc1..95fbe47ffb 100644
--- a/packages/app/src/git/working-diff-comparison/state.test.ts
+++ b/packages/app/src/git/working-diff-comparison/state.test.ts
@@ -1,6 +1,5 @@
 import { describe, expect, it } from "vitest";
 import {
-  expireWorkingDiffComparisonsInState,
   resolveWorkingDiffComparisonFromState,
   selectWorkingDiffComparisonInState,
   type WorkingDiffComparisonState,
@@ -26,79 +25,22 @@ describe("working diff comparison", () => {
     );
   });
 
-  it("defaults from checkout dirtiness and honors a matching manual selection", () => {
-    expect(
-      resolveWorkingDiffComparisonFromState(emptyState(), { ...checkout, isDirty: true }),
-    ).toBe("uncommitted");
-    expect(
-      resolveWorkingDiffComparisonFromState(emptyState(), { ...checkout, isDirty: false }),
-    ).toBe("base");
-
-    const selected = selectWorkingDiffComparisonInState(emptyState(), {
-      ...checkout,
-      comparison: "base",
-      isDirty: true,
-    });
-    expect(resolveWorkingDiffComparisonFromState(selected, { ...checkout, isDirty: true })).toBe(
-      "base",
-    );
+  it.each([true, false])("defaults to All changes when checkout dirtiness is %s", (isDirty) => {
+    const status = { ...checkout, isDirty };
+    expect(resolveWorkingDiffComparisonFromState(emptyState(), status)).toBe("all");
   });
 
-  it("masks and expires stale selections for every workspace on the checkout", () => {
-    let state = selectWorkingDiffComparisonInState(emptyState(), {
-      ...checkout,
-      comparison: "base",
-      isDirty: true,
-    });
-    state = selectWorkingDiffComparisonInState(state, {
-      ...checkout,
-      workspaceId: "workspace-2",
-      comparison: "uncommitted",
-      isDirty: false,
-    });
-    state = selectWorkingDiffComparisonInState(state, {
-      serverId: "server-2",
-      workspaceId: "workspace-3",
-      cwd: "/other",
-      comparison: "base",
-      isDirty: true,
-    });
-
-    expect(resolveWorkingDiffComparisonFromState(state, { ...checkout, isDirty: false })).toBe(
-      "base",
-    );
-    const expired = expireWorkingDiffComparisonsInState(state, {
-      serverId: checkout.serverId,
-      cwd: checkout.cwd,
-      isDirty: false,
-    });
-    expect(expired.overrides[workingDiffComparisonKey(checkout)]).toBeUndefined();
-    expect(
-      expired.overrides[workingDiffComparisonKey({ ...checkout, workspaceId: "workspace-2" })],
-    ).toBeDefined();
-    expect(
-      expired.overrides[
-        workingDiffComparisonKey({
-          serverId: "server-2",
-          workspaceId: "workspace-3",
-          cwd: "/other",
-        })
-      ],
-    ).toBeDefined();
-  });
-
-  it("keeps state identity when nothing expires", () => {
-    const state = selectWorkingDiffComparisonInState(emptyState(), {
-      ...checkout,
-      comparison: "base",
-      isDirty: true,
-    });
-    expect(
-      expireWorkingDiffComparisonsInState(state, {
-        serverId: checkout.serverId,
-        cwd: checkout.cwd,
-        isDirty: true,
-      }),
-    ).toBe(state);
-  });
+  it.each(["all", "base", "uncommitted"] as const)(
+    "keeps the selected %s comparison",
+    (comparison) => {
+      const selected = selectWorkingDiffComparisonInState(emptyState(), {
+        ...checkout,
+        comparison,
+      });
+      expect(resolveWorkingDiffComparisonFromState(selected, checkout)).toBe(comparison);
+      expect(
+        resolveWorkingDiffComparisonFromState(selected, { ...checkout, workspaceId: "other" }),
+      ).toBe("all");
+    },
+  );
 });
diff --git a/packages/app/src/git/working-diff-comparison/state.ts b/packages/app/src/git/working-diff-comparison/state.ts
index 5c7c141376..cf077a7316 100644
--- a/packages/app/src/git/working-diff-comparison/state.ts
+++ b/packages/app/src/git/working-diff-comparison/state.ts
@@ -1,10 +1,7 @@
-export type WorkingDiffComparison = "uncommitted" | "base";
+export type WorkingDiffComparison = "uncommitted" | "base" | "all";
 
 export interface WorkingDiffComparisonOverride {
-  serverId: string;
-  cwd: string;
   comparison: WorkingDiffComparison;
-  isDirtyAtSelection: boolean;
 }
 
 export interface WorkingDiffComparisonState {
@@ -34,17 +31,13 @@ export function selectWorkingDiffComparisonInState(
   state: WorkingDiffComparisonState,
   input: WorkingDiffCheckoutIdentity & {
     comparison: WorkingDiffComparison;
-    isDirty: boolean;
   },
 ): WorkingDiffComparisonState {
   return {
     overrides: {
       ...state.overrides,
       [workingDiffComparisonKey(input)]: {
-        serverId: input.serverId.trim(),
-        cwd: normalizeCwd(input.cwd),
         comparison: input.comparison,
-        isDirtyAtSelection: input.isDirty,
       },
     },
   };
@@ -52,34 +45,7 @@ export function selectWorkingDiffComparisonInState(
 
 export function resolveWorkingDiffComparisonFromState(
   state: WorkingDiffComparisonState,
-  input: WorkingDiffCheckoutIdentity & { isDirty: boolean },
+  input: WorkingDiffCheckoutIdentity,
 ): WorkingDiffComparison {
-  const override = state.overrides[workingDiffComparisonKey(input)];
-  // Status can render before boundary expiry runs, so resolution must also mask a stale
-  // selection under any ordering of the two updates.
-  if (override?.isDirtyAtSelection === input.isDirty) {
-    return override.comparison;
-  }
-  return input.isDirty ? "uncommitted" : "base";
-}
-
-export function expireWorkingDiffComparisonsInState(
-  state: WorkingDiffComparisonState,
-  input: { serverId: string; cwd: string; isDirty: boolean },
-): WorkingDiffComparisonState {
-  // Expire at the status boundary so selections cannot return after an unmounted surface
-  // misses a dirty-state transition.
-  const staleKeys = Object.entries(state.overrides)
-    .filter(
-      ([, override]) =>
-        override.serverId === input.serverId.trim() &&
-        override.cwd === normalizeCwd(input.cwd) &&
-        override.isDirtyAtSelection !== input.isDirty,
-    )
-    .map(([key]) => key);
-  if (staleKeys.length === 0) return state;
-
-  const overrides = { ...state.overrides };
-  for (const key of staleKeys) delete overrides[key];
-  return { overrides };
+  return state.overrides[workingDiffComparisonKey(input)]?.comparison ?? "all";
 }
diff --git a/packages/app/src/i18n/resources/ar.ts b/packages/app/src/i18n/resources/ar.ts
index accd9cec6d..388f9be16f 100644
--- a/packages/app/src/i18n/resources/ar.ts
+++ b/packages/app/src/i18n/resources/ar.ts
@@ -956,6 +956,7 @@ export const ar: TranslationResources = {
         checkingRepository: "فحص المستودع...",
         notRepository: "ليس مستودع جيت",
         diffMode: "وضع الفرق",
+        all: "كل التغييرات",
         uncommitted: "غير ملتزم",
         committed: "ملتزم",
         branchUnknown: "مجهول",
diff --git a/packages/app/src/i18n/resources/en.ts b/packages/app/src/i18n/resources/en.ts
index 8002c0ff46..d64c19871d 100644
--- a/packages/app/src/i18n/resources/en.ts
+++ b/packages/app/src/i18n/resources/en.ts
@@ -964,6 +964,7 @@ export const en = {
         checkingRepository: "Checking repository...",
         notRepository: "Not a git repository",
         diffMode: "Diff mode",
+        all: "All changes",
         uncommitted: "Uncommitted",
         committed: "Committed",
         branchUnknown: "Unknown",
diff --git a/packages/app/src/i18n/resources/es.ts b/packages/app/src/i18n/resources/es.ts
index 464b1ab208..27c4ab8404 100644
--- a/packages/app/src/i18n/resources/es.ts
+++ b/packages/app/src/i18n/resources/es.ts
@@ -989,6 +989,7 @@ export const es: TranslationResources = {
         checkingRepository: "Comprobando repositorio...",
         notRepository: "No es un repositorio de git",
         diffMode: "modo diferencial",
+        all: "Todos los cambios",
         uncommitted: "No comprometido",
         committed: "Comprometido",
         branchUnknown: "Desconocido",
diff --git a/packages/app/src/i18n/resources/fr.ts b/packages/app/src/i18n/resources/fr.ts
index 4f8b43889a..29464ca9e2 100644
--- a/packages/app/src/i18n/resources/fr.ts
+++ b/packages/app/src/i18n/resources/fr.ts
@@ -982,6 +982,7 @@ export const fr: TranslationResources = {
         checkingRepository: "Vérification du dépôt…",
         notRepository: "Ce n’est pas un dépôt git",
         diffMode: "Mode de diff",
+        all: "Toutes les modifications",
         uncommitted: "Non commité",
         committed: "Commité",
         branchUnknown: "Inconnue",
diff --git a/packages/app/src/i18n/resources/ja.ts b/packages/app/src/i18n/resources/ja.ts
index 9fb11cb2e1..e3dba618ee 100644
--- a/packages/app/src/i18n/resources/ja.ts
+++ b/packages/app/src/i18n/resources/ja.ts
@@ -969,6 +969,7 @@ export const ja: TranslationResources = {
         checkingRepository: "リポジトリを確認中...",
         notRepository: "gitリポジトリではありません",
         diffMode: "差分モード",
+        all: "すべての変更",
         uncommitted: "未コミット",
         committed: "コミット済み",
         branchUnknown: "不明",
diff --git a/packages/app/src/i18n/resources/ko.ts b/packages/app/src/i18n/resources/ko.ts
index e079ae90f1..0c82504aaa 100644
--- a/packages/app/src/i18n/resources/ko.ts
+++ b/packages/app/src/i18n/resources/ko.ts
@@ -963,6 +963,7 @@ export const ko: TranslationResources = {
         checkingRepository: "저장소 확인 중...",
         notRepository: "Git 저장소가 아닙니다",
         diffMode: "Diff 모드",
+        all: "모든 변경 사항",
         uncommitted: "커밋되지 않음",
         committed: "커밋됨",
         branchUnknown: "알 수 없음",
diff --git a/packages/app/src/i18n/resources/pt-BR.ts b/packages/app/src/i18n/resources/pt-BR.ts
index 84a5cb7c5f..842dea8f5e 100644
--- a/packages/app/src/i18n/resources/pt-BR.ts
+++ b/packages/app/src/i18n/resources/pt-BR.ts
@@ -979,6 +979,7 @@ export const ptBR: TranslationResources = {
         checkingRepository: "Verificando repositório...",
         notRepository: "Não é um repositório git",
         diffMode: "Modo de diff",
+        all: "Todas as alterações",
         uncommitted: "Sem commit",
         committed: "Com commit",
         branchUnknown: "Desconhecido",
diff --git a/packages/app/src/i18n/resources/ru.ts b/packages/app/src/i18n/resources/ru.ts
index 54f0c2d6ca..7a5881c1b7 100644
--- a/packages/app/src/i18n/resources/ru.ts
+++ b/packages/app/src/i18n/resources/ru.ts
@@ -973,6 +973,7 @@ export const ru: TranslationResources = {
         checkingRepository: "Проверяем репозиторий...",
         notRepository: "Это не репозиторий Git",
         diffMode: "Режим диффа",
+        all: "Все изменения",
         uncommitted: "Незафиксированные изменения",
         committed: "Зафиксированные изменения",
         branchUnknown: "Неизвестная ветка",
diff --git a/packages/app/src/i18n/resources/zh-CN.ts b/packages/app/src/i18n/resources/zh-CN.ts
index 8476e55464..6cd2be6e81 100644
--- a/packages/app/src/i18n/resources/zh-CN.ts
+++ b/packages/app/src/i18n/resources/zh-CN.ts
@@ -948,6 +948,7 @@ export const zhCN: TranslationResources = {
         checkingRepository: "正在检查 repository...",
         notRepository: "不是 git repository",
         diffMode: "Diff 模式",
+        all: "全部更改",
         uncommitted: "未 commit",
         committed: "已 commit",
         branchUnknown: "未知",
diff --git a/packages/app/src/review/state.ts b/packages/app/src/review/state.ts
index 20fe98e098..0a1a965db5 100644
--- a/packages/app/src/review/state.ts
+++ b/packages/app/src/review/state.ts
@@ -1,6 +1,6 @@
 import { z } from "zod";
 
-export type ReviewDraftMode = "uncommitted" | "base";
+export type ReviewDraftMode = "uncommitted" | "base" | "all";
 export type ReviewDraftSide = "old" | "new";
 
 export interface ReviewDraftComment {
diff --git a/packages/client/src/daemon-client.ts b/packages/client/src/daemon-client.ts
index 94d20585e2..de127c5b6d 100644
--- a/packages/client/src/daemon-client.ts
+++ b/packages/client/src/daemon-client.ts
@@ -4395,10 +4395,10 @@ export class DaemonClient {
   }
 
   private normalizeCheckoutDiffCompare(compare: {
-    mode: "uncommitted" | "base";
+    mode: "uncommitted" | "base" | "all";
     baseRef?: string;
     ignoreWhitespace?: boolean;
-  }): { mode: "uncommitted" | "base"; baseRef?: string; ignoreWhitespace?: boolean } {
+  }): { mode: "uncommitted" | "base" | "all"; baseRef?: string; ignoreWhitespace?: boolean } {
     if (compare.mode === "uncommitted") {
       return compare.ignoreWhitespace === true
         ? { mode: "uncommitted", ignoreWhitespace: true }
@@ -4407,17 +4407,17 @@ export class DaemonClient {
     const trimmedBaseRef = compare.baseRef?.trim();
     if (!trimmedBaseRef) {
       return compare.ignoreWhitespace === true
-        ? { mode: "base", ignoreWhitespace: true }
-        : { mode: "base" };
+        ? { mode: compare.mode, ignoreWhitespace: true }
+        : { mode: compare.mode };
     }
     return compare.ignoreWhitespace === true
-      ? { mode: "base", baseRef: trimmedBaseRef, ignoreWhitespace: true }
-      : { mode: "base", baseRef: trimmedBaseRef };
+      ? { mode: compare.mode, baseRef: trimmedBaseRef, ignoreWhitespace: true }
+      : { mode: compare.mode, baseRef: trimmedBaseRef };
   }
 
   async getCheckoutDiff(
     cwd: string,
-    compare: { mode: "uncommitted" | "base"; baseRef?: string; ignoreWhitespace?: boolean },
+    compare: { mode: "uncommitted" | "base" | "all"; baseRef?: string; ignoreWhitespace?: boolean },
     requestId?: string,
   ): Promise<CheckoutDiffPayload> {
     return this.sendCorrelatedSessionRequest({
@@ -4433,7 +4433,7 @@ export class DaemonClient {
 
   observeCheckoutDiff(
     cwd: string,
-    compare: { mode: "uncommitted" | "base"; baseRef?: string; ignoreWhitespace?: boolean },
+    compare: { mode: "uncommitted" | "base" | "all"; baseRef?: string; ignoreWhitespace?: boolean },
     options?: { requestId?: string; signal?: AbortSignal },
   ): OwnedSubscription<SubscribeCheckoutDiffPayload> {
     return this.observe(
diff --git a/packages/protocol/src/messages.test.ts b/packages/protocol/src/messages.test.ts
index ca3ab86135..373cef409b 100644
--- a/packages/protocol/src/messages.test.ts
+++ b/packages/protocol/src/messages.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, test } from "vitest";
 import {
   AgentTimelineItemPayloadSchema,
+  SendAgentMessageRequestSchema,
   FileExplorerRequestSchema,
   PaseoWorktreeArchiveRequestSchema,
   parseServerInfoStatusPayload,
@@ -548,3 +549,25 @@ test("agent messages are an optional semantic payload on existing tool rows", ()
     }).success,
   ).toBe(false);
 });
+
+test.each(["all", "base", "uncommitted"] as const)(
+  "preserves %s review attachments while ignoring unknown attachments",
+  (mode) => {
+    const attachment = {
+      type: "review",
+      mimeType: "application/paseo-review",
+      cwd: "/repo",
+      mode,
+      baseRef: "main",
+      comments: [],
+    };
+    const parsed = SendAgentMessageRequestSchema.parse({
+      type: "send_agent_message_request",
+      requestId: "review",
+      agentId: "agent",
+      text: "Review",
+      attachments: [{ type: "future_attachment" }, attachment],
+    });
+    expect(parsed.attachments).toEqual([attachment]);
+  },
+);
diff --git a/packages/protocol/src/messages.ts b/packages/protocol/src/messages.ts
index 8eff2fbbd2..3e5deeb88e 100644
--- a/packages/protocol/src/messages.ts
+++ b/packages/protocol/src/messages.ts
@@ -1168,7 +1168,7 @@ export const ReviewAttachmentSchema = z.object({
   type: z.literal("review"),
   mimeType: z.literal("application/paseo-review"),
   cwd: z.string(),
-  mode: z.enum(["uncommitted", "base"]),
+  mode: z.enum(["uncommitted", "base", "all"]),
   baseRef: z.string().nullable().optional(),
   comments: z.array(ReviewAttachmentCommentSchema),
 });
@@ -2201,7 +2201,7 @@ const CheckoutErrorSchema = z.object({
 });
 
 const CheckoutDiffCompareSchema = z.object({
-  mode: z.enum(["uncommitted", "base"]),
+  mode: z.enum(["uncommitted", "base", "all"]),
   baseRef: z.string().optional(),
   ignoreWhitespace: z.boolean().optional(),
 });
@@ -3793,6 +3793,7 @@ export const ServerInfoStatusPayloadSchema = z
         fsEntryDuplicate: z.boolean().optional(),
         // COMPAT(checkoutDiscardChanges): added in v0.3.0, remove gate after 2027-02-08.
         checkoutDiscardChanges: z.boolean().optional(),
+        checkoutDiffAll: z.boolean().optional(),
         // COMPAT(agentProfiles): added in v0.3.2, remove gate after 2027-02-11.
         // An older daemon parses its persisted config strictly, so writing
         // agentProfiles to one is silently dropped. The client hides the feature
diff --git a/packages/server/src/server/agent/prompt-attachments.test.ts b/packages/server/src/server/agent/prompt-attachments.test.ts
index 41d4a424d8..2fd022547e 100644
--- a/packages/server/src/server/agent/prompt-attachments.test.ts
+++ b/packages/server/src/server/agent/prompt-attachments.test.ts
@@ -69,13 +69,13 @@ describe("prompt attachments", () => {
     ).toContain("GitLab MR !123: Fix race in worktree setup");
   });
 
-  it("renders review attachments with compact file, line, comment, and context details", () => {
+  it.each(["base", "uncommitted", "all"] as const)("renders %s reviews", (mode) => {
     expect(
       renderPromptAttachmentAsText({
         type: "review",
         mimeType: "application/paseo-review",
         cwd: "/tmp/repo",
-        mode: "base",
+        mode,
         baseRef: "main",
         comments: [
           {
@@ -111,7 +111,7 @@ describe("prompt attachments", () => {
       }),
     ).toBe(
       [
-        "Paseo review attachment (base)",
+        `Paseo review attachment (${mode})`,
         "CWD: /tmp/repo",
         "Base: main",
         "",
diff --git a/packages/server/src/server/checkout-diff-cache.test.ts b/packages/server/src/server/checkout-diff-cache.test.ts
index e2ac4f31ba..37f9283320 100644
--- a/packages/server/src/server/checkout-diff-cache.test.ts
+++ b/packages/server/src/server/checkout-diff-cache.test.ts
@@ -114,3 +114,21 @@ test("active reads survive completed-payload eviction and failed reads can retry
     }),
   ).toEqual({ diff: "retry" });
 });
+
+test.each(["base", "uncommitted"] as const)(
+  "%s invalidation refreshes All changes without merging base-ref cache entries",
+  async (mode) => {
+    const cache = new CheckoutDiffCache(() => 0);
+    const read = (baseRef: string, value: string) =>
+      cache.read({
+        cwd: "repo",
+        compare: { mode: "all", baseRef },
+        load: async () => ({ diff: value }),
+      });
+    expect(await read("main", "main-before")).toEqual({ diff: "main-before" });
+    expect(await read("next", "next-before")).toEqual({ diff: "next-before" });
+    cache.invalidate("repo", mode);
+    expect(await read("main", "main-after")).toEqual({ diff: "main-after" });
+    expect(await read("next", "next-after")).toEqual({ diff: "next-after" });
+  },
+);
diff --git a/packages/server/src/server/checkout-diff-cache.ts b/packages/server/src/server/checkout-diff-cache.ts
index 38675bea37..4547cdf2e5 100644
--- a/packages/server/src/server/checkout-diff-cache.ts
+++ b/packages/server/src/server/checkout-diff-cache.ts
@@ -35,7 +35,7 @@ export class CheckoutDiffCache {
     const key = JSON.stringify([
       cwd,
       compare.mode,
-      compare.mode === "base" ? (compare.baseRef ?? null) : null,
+      compare.mode !== "uncommitted" ? (compare.baseRef ?? null) : null,
       compare.ignoreWhitespace === true,
       compare.includeStructured === true,
     ]);
@@ -83,7 +83,7 @@ export class CheckoutDiffCache {
   invalidate(cwd: string, mode: CheckoutDiffCompare["mode"]): void {
     for (const key of new Set([...this.values.keys(), ...this.active.keys()])) {
       const [cachedCwd, cachedMode] = JSON.parse(key) as string[];
-      if (cachedCwd !== cwd || cachedMode !== mode) continue;
+      if (cachedCwd !== cwd || (cachedMode !== mode && cachedMode !== "all")) continue;
       this.values.delete(key);
       const pending = this.active.get(key);
       if (pending) pending.invalidated = true;
diff --git a/packages/server/src/server/checkout-diff-manager.ts b/packages/server/src/server/checkout-diff-manager.ts
index 628bb32a0a..6dc437297d 100644
--- a/packages/server/src/server/checkout-diff-manager.ts
+++ b/packages/server/src/server/checkout-diff-manager.ts
@@ -158,15 +158,15 @@ export class CheckoutDiffManager {
     }
     const trimmedBaseRef = compare.baseRef?.trim();
     return trimmedBaseRef
-      ? { mode: "base", baseRef: trimmedBaseRef, ignoreWhitespace }
-      : { mode: "base", ignoreWhitespace };
+      ? { mode: compare.mode, baseRef: trimmedBaseRef, ignoreWhitespace }
+      : { mode: compare.mode, ignoreWhitespace };
   }
 
   private buildTargetKey(cwd: string, compare: CheckoutDiffCompareInput): string {
     return JSON.stringify([
       cwd,
       compare.mode,
-      compare.mode === "base" ? (compare.baseRef ?? "") : "",
+      compare.mode !== "uncommitted" ? (compare.baseRef ?? "") : "",
       compare.ignoreWhitespace === true,
     ]);
   }
@@ -364,7 +364,7 @@ export class CheckoutDiffManager {
   }
 
   private async openTarget(target: CheckoutDiffWatchTarget): Promise<void> {
-    if (target.compare.mode === "base") {
+    if (target.compare.mode !== "uncommitted") {
       const snapshot =
         this.workspaceGitService.peekSnapshot(target.cwd) ??
         (await this.workspaceGitService.getSnapshot(target.cwd, { includeForge: false }));
@@ -382,7 +382,7 @@ export class CheckoutDiffManager {
         return;
       }
       target.workspaceGitUnsubscribe = workspaceSubscription.unsubscribe;
-      return;
+      if (target.compare.mode === "base") return;
     }
 
     const { repoRoot, unsubscribe } = await this.workspaceGitService.requestWorkingTreeWatch(
diff --git a/packages/server/src/server/daemon-e2e/checkout-diff-content.e2e.test.ts b/packages/server/src/server/daemon-e2e/checkout-diff-content.e2e.test.ts
index 75302d4168..09da7506c9 100644
--- a/packages/server/src/server/daemon-e2e/checkout-diff-content.e2e.test.ts
+++ b/packages/server/src/server/daemon-e2e/checkout-diff-content.e2e.test.ts
@@ -1,5 +1,6 @@
 import { execFileSync } from "node:child_process";
 import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { expect, test } from "vitest";
@@ -158,3 +159,67 @@ test.each(
   },
   60_000,
 );
+
+test("All changes subscriptions refresh on file edits and commits", async () => {
+  const ctx = await createDaemonTestContext();
+  const cwd = mkdtempSync(join(tmpdir(), "checkout-diff-all-"));
+  try {
+    git(cwd, "init", "-b", "main");
+    git(cwd, "config", "user.name", "Test");
+    git(cwd, "config", "user.email", "test@example.com");
+    writeFileSync(join(cwd, "file.txt"), "base\n");
+    git(cwd, "add", ".");
+    git(cwd, "-c", "commit.gpgsign=false", "commit", "-m", "base");
+    git(cwd, "checkout", "-b", "feature");
+    writeFileSync(join(cwd, "file.txt"), "committed\n");
+    git(cwd, "add", ".");
+    git(cwd, "-c", "commit.gpgsign=false", "commit", "-m", "feature");
+    const subscription = ctx.client.observeCheckoutDiff(cwd, { mode: "all", baseRef: "main" });
+    try {
+      let latest = await subscription.ready;
+      expect(latest.error).toBeNull();
+      subscription.subscribe({
+        snapshot: (snapshot) => {
+          latest = snapshot;
+        },
+        update: (message) => {
+          if (message.type === "checkout_diff_update") latest = message.payload;
+        },
+      });
+      writeFileSync(join(cwd, "file.txt"), "working\n");
+      await expect
+        .poll(
+          () =>
+            latest.files[0]?.hunks
+              .flatMap((hunk) => hunk.lines)
+              .filter((line) => line.type === "add")
+              .map((line) => line.content),
+          { timeout: 15_000 },
+        )
+        .toEqual(["working"]);
+      writeFileSync(join(cwd, "new.txt"), "untracked\n");
+      await expect
+        .poll(() => latest.files.map((file) => file.path), { timeout: 15_000 })
+        .toEqual(["file.txt", "new.txt"]);
+      const beforeCommit = latest.files;
+      git(cwd, "add", ".");
+      git(cwd, "-c", "commit.gpgsign=false", "commit", "-m", "working");
+      expect(
+        (await ctx.client.getCheckoutDiff(cwd, { mode: "all", baseRef: "main" })).files,
+      ).toEqual(beforeCommit);
+      writeFileSync(join(cwd, "file.txt"), "base\n");
+      await expect
+        .poll(() => latest.files.map((file) => file.path), { timeout: 15_000 })
+        .toEqual(["new.txt"]);
+      git(cwd, "checkout", "--", "file.txt");
+      await expect
+        .poll(() => latest.files.map((file) => file.path), { timeout: 15_000 })
+        .toEqual(["file.txt", "new.txt"]);
+    } finally {
+      await subscription.release();
+    }
+  } finally {
+    await ctx.cleanup();
+    await rm(cwd, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 });
+  }
+}, 60_000);
diff --git a/packages/server/src/server/websocket-server.ts b/packages/server/src/server/websocket-server.ts
index dff09358a0..214fc8c9ce 100644
--- a/packages/server/src/server/websocket-server.ts
+++ b/packages/server/src/server/websocket-server.ts
@@ -2096,6 +2096,7 @@ export class VoiceAssistantWebSocketServer {
         fsEntryDuplicate: true,
         // COMPAT(checkoutDiscardChanges): added in v0.3.0, remove gate after 2027-02-08.
         checkoutDiscardChanges: true,
+        checkoutDiffAll: true,
         // COMPAT(agentProfiles): added in v0.3.2, remove gate after 2027-02-11.
         agentProfiles: true,
         // COMPAT(agentConfigApply): added in v0.3.2, remove gate after 2027-02-11.
diff --git a/packages/server/src/server/workspace-git-service.ts b/packages/server/src/server/workspace-git-service.ts
index a2b89bed39..be62376130 100644
--- a/packages/server/src/server/workspace-git-service.ts
+++ b/packages/server/src/server/workspace-git-service.ts
@@ -827,7 +827,7 @@ export class WorkspaceGitServiceImpl implements WorkspaceGitService {
   private normalizeCheckoutDiffOptions(options: CheckoutDiffCompare): CheckoutDiffCompare {
     return {
       mode: options.mode,
-      ...(options.mode === "base" && options.baseRef !== undefined
+      ...(options.mode !== "uncommitted" && options.baseRef !== undefined
         ? { baseRef: options.baseRef }
         : {}),
       ...(options.ignoreWhitespace === true ? { ignoreWhitespace: true } : {}),
diff --git a/packages/server/src/utils/checkout-git.test.ts b/packages/server/src/utils/checkout-git.test.ts
index fe8ebdce47..0ef41b3b6f 100644
--- a/packages/server/src/utils/checkout-git.test.ts
+++ b/packages/server/src/utils/checkout-git.test.ts
@@ -1398,6 +1398,92 @@ const x = 1;
     expect(diff.structured).toEqual([]);
   });
 
+  it.each([
+    { contents: "hello\n", expectedFiles: [], patch: "" },
+    {
+      contents: "restored\n",
+      expectedFiles: [
+        { path: "file.txt", isNew: false, isDeleted: false, additions: 1, deletions: 1 },
+      ],
+      patch: "-hello\n+restored\n",
+    },
+  ])(
+    "compares restored untracked base files against disk: $contents",
+    async ({ contents, expectedFiles, patch }) => {
+      execFileSync("git", ["checkout", "-b", "feature"], { cwd: repoDir });
+      execFileSync("git", ["rm", "file.txt"], { cwd: repoDir });
+      execFileSync("git", ["-c", "commit.gpgsign=false", "commit", "-m", "delete"], {
+        cwd: repoDir,
+      });
+      writeFileSync(join(repoDir, "file.txt"), contents);
+      const indexPath = execFileSync("git", ["rev-parse", "--git-path", "index"], {
+        cwd: repoDir,
+        encoding: "utf8",
+      }).trim();
+      const beforeIndex = readFileSync(join(repoDir, indexPath));
+      const beforeStatus = execFileSync("git", ["status", "--porcelain=v1", "-z"], {
+        cwd: repoDir,
+      });
+      const result = await getCheckoutDiff(repoDir, {
+        mode: "all",
+        baseRef: "main",
+        includeStructured: true,
+      });
+      expect(
+        result.structured?.map(({ path, isNew, isDeleted, additions, deletions }) => ({
+          path,
+          isNew,
+          isDeleted,
+          additions,
+          deletions,
+        })),
+      ).toEqual(expectedFiles);
+      expect(result.diff).toContain(patch);
+      expect(result.diff.length === 0).toBe(expectedFiles.length === 0);
+      expect(readFileSync(join(repoDir, indexPath))).toEqual(beforeIndex);
+      expect(execFileSync("git", ["status", "--porcelain=v1", "-z"], { cwd: repoDir })).toEqual(
+        beforeStatus,
+      );
+      expect(readFileSync(join(repoDir, "file.txt"), "utf8")).toBe(contents);
+      expect((await getCheckoutDiff(repoDir, { mode: "base", baseRef: "main" })).diff).toContain(
+        "deleted file mode",
+      );
+      expect((await getCheckoutDiff(repoDir, { mode: "uncommitted" })).diff).toContain(
+        "new file mode",
+      );
+    },
+  );
+
+  it("compares all changes as one net patch including untracked files", async () => {
+    execFileSync("git", ["checkout", "-b", "feature"], { cwd: repoDir });
+    writeFileSync(join(repoDir, "file.txt"), "committed\n");
+    execFileSync("git", ["add", "."], { cwd: repoDir });
+    execFileSync("git", ["-c", "commit.gpgsign=false", "commit", "-m", "feature"], {
+      cwd: repoDir,
+    });
+    writeFileSync(join(repoDir, "file.txt"), "working\n");
+    writeFileSync(join(repoDir, "new.txt"), "untracked\n");
+    const compare = { mode: "all", baseRef: "main", includeStructured: true } as const;
+    const before = await getCheckoutDiff(repoDir, compare);
+    expect(before.structured?.map((file) => file.path)).toEqual(["file.txt", "new.txt"]);
+    expect(before.diff).toContain("-hello\n+working\n");
+    expect(before.diff).not.toContain("committed");
+    expect(before.diff).toContain("+untracked");
+    const committed = await getCheckoutDiff(repoDir, { ...compare, mode: "base" });
+    expect(committed.diff).toContain("-hello\n+committed\n");
+    const uncommitted = await getCheckoutDiff(repoDir, { ...compare, mode: "uncommitted" });
+    expect(uncommitted.diff).toContain("-committed\n+working\n");
+    execFileSync("git", ["add", "."], { cwd: repoDir });
+    execFileSync("git", ["-c", "commit.gpgsign=false", "commit", "-m", "working"], {
+      cwd: repoDir,
+    });
+    expect((await getCheckoutDiff(repoDir, compare)).diff).toBe(before.diff);
+    writeFileSync(join(repoDir, "file.txt"), "hello\n");
+    expect((await getCheckoutDiff(repoDir, compare)).structured?.map((file) => file.path)).toEqual([
+      "new.txt",
+    ]);
+  });
+
   it("falls back to the local base branch when origin is absent", async () => {
     execFileSync("git", ["checkout", "-b", "feature"], { cwd: repoDir });
     writeFileSync(join(repoDir, "local-feature.txt"), "feature\n");
diff --git a/packages/server/src/utils/checkout-git.ts b/packages/server/src/utils/checkout-git.ts
index ce00702908..f2001e4651 100644
--- a/packages/server/src/utils/checkout-git.ts
+++ b/packages/server/src/utils/checkout-git.ts
@@ -1,7 +1,8 @@
 import { MAX_RELAY_WEBSOCKET_MESSAGE_BYTES } from "@getpaseo/protocol/websocket-message-limit";
 import { resolve, dirname, basename } from "path";
 import { existsSync, realpathSync } from "fs";
-import { open as openFile, readFile, stat as statFile } from "fs/promises";
+import { open as openFile, readFile, stat as statFile, mkdtemp, copyFile, rm } from "fs/promises";
+import { tmpdir } from "node:os";
 import { setImmediate } from "node:timers/promises";
 import { TTLCache } from "@isaacs/ttlcache";
 import type { CheckoutCommit, CheckoutCommitFile } from "@getpaseo/protocol/messages";
@@ -203,6 +204,7 @@ interface CheckoutFileChange {
 }
 
 interface CheckoutDiffRefs {
+  indexEnv?: { GIT_INDEX_FILE: string };
   baseRef: string;
   targetRef?: string;
   includeUntracked: boolean;
@@ -518,7 +520,7 @@ async function listCheckoutFileChanges(
       ignoreWhitespace,
       extra: ["-z", "--name-status", ...getCheckoutDiffRefArgs(refs)],
     }),
-    { cwd, envOverlay: READ_ONLY_GIT_ENV },
+    { cwd, envOverlay: { ...READ_ONLY_GIT_ENV, ...refs.indexEnv } },
   );
   const nameStatusFields = nameStatusOut.split("\0");
   for (let index = 0; index < nameStatusFields.length; ) {
@@ -556,7 +558,7 @@ async function listCheckoutFileChanges(
       ["ls-files", "-z", "--others", "--exclude-standard"],
       {
         cwd,
-        envOverlay: READ_ONLY_GIT_ENV,
+        envOverlay: { ...READ_ONLY_GIT_ENV, ...refs.indexEnv },
       },
     );
     for (const file of untrackedOut.split("\0").filter(Boolean)) {
@@ -671,7 +673,7 @@ async function getTrackedNumstatByPath(
     }),
     {
       cwd,
-      envOverlay: READ_ONLY_GIT_ENV,
+      envOverlay: { ...READ_ONLY_GIT_ENV, ...refs.indexEnv },
       maxOutputBytes: TRACKED_DIFF_NUMSTAT_MAX_BYTES,
       acceptExitCodes: [0],
     },
@@ -736,7 +738,7 @@ async function getTrackedDiffTextForPath(input: {
     }),
     {
       cwd: input.cwd,
-      envOverlay: READ_ONLY_GIT_ENV,
+      envOverlay: { ...READ_ONLY_GIT_ENV, ...input.refsForDiff.indexEnv },
       maxOutputBytes: PER_FILE_DIFF_MAX_BYTES,
     },
   );
@@ -779,7 +781,11 @@ async function getTrackedDiffTexts(input: {
         ...input.paths.map((path) => `:(literal)${path}`),
       ],
     }),
-    { cwd: input.cwd, envOverlay: READ_ONLY_GIT_ENV, maxOutputBytes: 8 * PER_FILE_DIFF_MAX_BYTES },
+    {
+      cwd: input.cwd,
+      envOverlay: { ...READ_ONLY_GIT_ENV, ...input.refsForDiff.indexEnv },
+      maxOutputBytes: 8 * PER_FILE_DIFF_MAX_BYTES,
+    },
   );
   const files = new Map<string, { path: string; text: string; truncated: boolean }>();
   if (!result.truncated) {
@@ -905,7 +911,7 @@ export type CheckoutDiffResult =
   | { diff: ""; structured: []; diffTooLarge: true };
 
 export interface CheckoutDiffCompare {
-  mode: "uncommitted" | "base";
+  mode: "uncommitted" | "base" | "all";
   baseRef?: string;
   ignoreWhitespace?: boolean;
   includeStructured?: boolean;
@@ -3479,11 +3485,58 @@ async function resolveCheckoutDiffRefs(
   const bestBaseRef = await resolveBestComparisonBaseRef(cwd, baseRef);
   return {
     baseRef: (await tryResolveMergeBase(cwd, bestBaseRef)) ?? bestBaseRef,
-    targetRef: "HEAD",
-    includeUntracked: false,
+    targetRef: compare.mode === "base" ? "HEAD" : undefined,
+    includeUntracked: compare.mode === "all",
   };
 }
 
+// Git's working-tree diff ignores files absent from the index, even when they
+// exist in the comparison tree. Restore those entries only in a private index.
+async function prepareAllChangesIndex(cwd: string, baseRef: string) {
+  const untracked = await runGitCommand(["ls-files", "-z", "--others", "--exclude-standard"], {
+    cwd,
+    envOverlay: READ_ONLY_GIT_ENV,
+  });
+  const paths = untracked.stdout.split("\0").filter(Boolean);
+  if (paths.length === 0) return null;
+  let entries = "";
+  for (let start = 0; start < paths.length; start += TRACKED_DIFF_BATCH_SIZE) {
+    const result = await runGitCommand(
+      [
+        "ls-tree",
+        "-r",
+        "-z",
+        baseRef,
+        "--",
+        ...paths.slice(start, start + TRACKED_DIFF_BATCH_SIZE).map((path) => `:(literal)${path}`),
+      ],
+      { cwd, envOverlay: READ_ONLY_GIT_ENV },
+    );
+    entries += result.stdout;
+  }
+  if (!entries) return null;
+  const directory = await mkdtemp(resolve(tmpdir(), "paseo-all-changes-"));
+  const indexFile = resolve(directory, "index");
+  try {
+    const index = await runGitCommand(["rev-parse", "--git-path", "index"], {
+      cwd,
+      envOverlay: READ_ONLY_GIT_ENV,
+    });
+    const indexPath = resolveGitRevParsePath(cwd, index.stdout);
+    if (!indexPath) throw new Error("Git did not return an index path");
+    await copyFile(indexPath, indexFile);
+    await runGitCommand(["update-index", "-z", "--index-info"], {
+      cwd,
+      input: entries,
+      envOverlay: { ...READ_ONLY_GIT_ENV, GIT_INDEX_FILE: indexFile },
+    });
+    return { indexFile, cleanup: () => rm(directory, { recursive: true, force: true }) };
+  } catch (error) {
+    await rm(directory, { recursive: true, force: true });
+    throw error;
+  }
+}
+
 export async function getCheckoutDiff(
   cwd: string,
   compare: CheckoutDiffCompare,
@@ -3496,6 +3549,23 @@ export async function getCheckoutDiff(
     return { diff: "" };
   }
 
+  const index =
+    compare.mode === "all" ? await prepareAllChangesIndex(cwd, refsForDiff.baseRef) : null;
+  try {
+    return await readCheckoutDiff(cwd, compare, {
+      ...refsForDiff,
+      indexEnv: index ? { GIT_INDEX_FILE: index.indexFile } : undefined,
+    });
+  } finally {
+    await index?.cleanup();
+  }
+}
+
+async function readCheckoutDiff(
+  cwd: string,
+  compare: CheckoutDiffCompare,
+  refsForDiff: CheckoutDiffRefs,
+): Promise<CheckoutDiffResult> {
   const ignoreWhitespace = compare.ignoreWhitespace === true;
   let effectiveRefsForDiff = refsForDiff;
   let changes: CheckoutFileChange[];