diff --git a/.github/guardrail-pulse-history.jsonl b/.github/guardrail-pulse-history.jsonl
index 411b2135d04..9eec4625564 100644
--- a/.github/guardrail-pulse-history.jsonl
+++ b/.github/guardrail-pulse-history.jsonl
@@ -1 +1,2 @@
 {"date": "2026-07-23", "metrics": {"brand_ui_purple": {"baseline": 1776, "count": 1776}, "deferred_work_markers": {"baseline": 837, "count": 837}, "lifecycle_unlabeled_scripts": {"baseline": 17, "count": 17}, "mapless_packages": {"baseline": 6, "count": 3}, "union_return_isinstance": {"baseline": 0, "count": 0}, "version_prefixed_files": {"baseline": 42, "count": 42}}}
+{"date": "2026-08-17", "metrics": {"brand_ui_purple": {"baseline": 1763, "count": 1763}, "deferred_work_markers": {"baseline": 829, "count": 829}, "lifecycle_unlabeled_scripts": {"baseline": 10, "count": 10}, "mapless_packages": {"baseline": 6, "count": 2}, "union_return_isinstance": {"baseline": 0, "count": 0}, "version_prefixed_files": {"baseline": 38, "count": 38}}}
diff --git a/desktop/windows/changelog/unreleased/2026-08-onboarding-per-account-reset.json b/desktop/windows/changelog/unreleased/2026-08-onboarding-per-account-reset.json
new file mode 100644
index 00000000000..fee74dd0c1e
--- /dev/null
+++ b/desktop/windows/changelog/unreleased/2026-08-onboarding-per-account-reset.json
@@ -0,0 +1,5 @@
+{
+  "changes": [
+    "Signing in with a different account now resets the onboarding wizard so the new user sees the full setup flow instead of being dropped straight to the home screen."
+  ]
+}
diff --git a/desktop/windows/src/renderer/src/lib/authTeardown.test.ts b/desktop/windows/src/renderer/src/lib/authTeardown.test.ts
index 738af3e5536..5eaca180879 100644
--- a/desktop/windows/src/renderer/src/lib/authTeardown.test.ts
+++ b/desktop/windows/src/renderer/src/lib/authTeardown.test.ts
@@ -8,14 +8,18 @@ const h = vi.hoisted(() => ({
   invalidateConversationsCache: vi.fn(),
   clearPendingConversations: vi.fn(),
   clearUserScopedPreferences: vi.fn(),
-  clearMemoryCache: vi.fn()
+  clearMemoryCache: vi.fn(),
+  resetOnboarding: vi.fn()
 }))
 
 vi.mock('./pageCache', () => ({
   invalidateConversationsCache: h.invalidateConversationsCache,
   clearPendingConversations: h.clearPendingConversations
 }))
-vi.mock('./preferences', () => ({ clearUserScopedPreferences: h.clearUserScopedPreferences }))
+vi.mock('./preferences', () => ({
+  clearUserScopedPreferences: h.clearUserScopedPreferences,
+  resetOnboarding: h.resetOnboarding
+}))
 vi.mock('./localAgentMemoryCache', () => ({ clearMemoryCache: h.clearMemoryCache }))
 
 import { reconcileAccountForSignIn, teardownUserData } from './authTeardown'
@@ -38,6 +42,7 @@ beforeEach(() => {
   h.clearPendingConversations.mockClear()
   h.clearUserScopedPreferences.mockClear()
   h.clearMemoryCache.mockClear()
+  h.resetOnboarding.mockClear()
   ;(globalThis as { window: { omi: unknown } }).window.omi = {
     wipeUserData,
     byokClearAll,
@@ -120,6 +125,8 @@ describe('reconcileAccountForSignIn — account-switch guard', () => {
     // The prior account's BYOK keys + Gmail session are cleared before B hydrates.
     expect(byokClearAll).toHaveBeenCalledTimes(1)
     expect(gmailSessionDisconnect).toHaveBeenCalledTimes(1)
+    // Onboarding is reset so the incoming account sees the wizard (new user on this device).
+    expect(h.resetOnboarding).toHaveBeenCalledTimes(1)
     expect(localStorage.getItem(LAST_UID_KEY)).toBe('userB')
     // The uid pointer must survive teardown (it's machine-scoped, not in the
     // user-scoped key list) so the NEXT switch is still detected.
@@ -131,6 +138,7 @@ describe('reconcileAccountForSignIn — account-switch guard', () => {
     await reconcileAccountForSignIn('userA')
 
     expect(wipeUserData).not.toHaveBeenCalled()
+    expect(h.resetOnboarding).not.toHaveBeenCalled()
     expect(localStorage.getItem(LAST_UID_KEY)).toBe('userA')
   })
 
@@ -139,6 +147,7 @@ describe('reconcileAccountForSignIn — account-switch guard', () => {
     await reconcileAccountForSignIn('userA')
 
     expect(wipeUserData).not.toHaveBeenCalled()
+    expect(h.resetOnboarding).not.toHaveBeenCalled()
     expect(localStorage.getItem(LAST_UID_KEY)).toBe('userA')
   })
 
diff --git a/desktop/windows/src/renderer/src/lib/authTeardown.ts b/desktop/windows/src/renderer/src/lib/authTeardown.ts
index 977344fcf59..ed27b3a97ff 100644
--- a/desktop/windows/src/renderer/src/lib/authTeardown.ts
+++ b/desktop/windows/src/renderer/src/lib/authTeardown.ts
@@ -9,7 +9,7 @@
 // (authSession.forceReauth) and never wipes data.
 import { clearMemoryCache } from './localAgentMemoryCache'
 import { clearPendingConversations, invalidateConversationsCache } from './pageCache'
-import { clearUserScopedPreferences } from './preferences'
+import { clearUserScopedPreferences, resetOnboarding } from './preferences'
 import { CHAT_INFINITE_ID_KEY } from './chatStorageKeys'
 import { POST_HISTORY_KEY } from './sync/backfillStorageKey'
 import { resetByokKeys } from './byokKeys'
@@ -117,7 +117,10 @@ export async function reconcileAccountForSignIn(uid: string | null): Promise<voi
   } catch {
     /* privacy mode */
   }
-  if (stored && stored !== uid) await teardownUserData()
+  if (stored && stored !== uid) {
+    resetOnboarding()
+    await teardownUserData()
+  }
   try {
     localStorage.setItem(LAST_UID_KEY, uid)
   } catch {