diff --git a/packages/client/ui-conversation/tests/conversation-assembler.client.spec.ts b/packages/client/ui-conversation/tests/conversation-assembler.client.spec.ts
index 641f887498..8057c2f95a 100644
--- a/packages/client/ui-conversation/tests/conversation-assembler.client.spec.ts
+++ b/packages/client/ui-conversation/tests/conversation-assembler.client.spec.ts
@@ -167,8 +167,8 @@ function fallbackDefinition(start: () => string): ConversationNodeDefinition<str
 describe('ConversationNodeAssembler', () => {
   it('publishes Location data through stable per-key sources', () => {
     const index = new ConversationLocationIndex()
-    const turnStart = at(1, 'turn/start', { turn: 1 })
-    const stepStart = at(2, 'step/start', { turn: 1, step: 1 })
+    const turnStart = at(SessionSeq(1), 'turn/start', { turn: 1 })
+    const stepStart = at(SessionSeq(2), 'step/start', { turn: 1, step: 1 })
     index.rebuild([input(turnStart), input(stepStart)])
     const location = index.locationOf(stepStart)
     if (location.kind !== 'step') throw new Error('scope probe requires a Step Location')
@@ -1088,16 +1088,16 @@ describe('ConversationNodeAssembler', () => {
       new TestViewDefinitions([testView(apply)]),
     )
     assembler.replaceWindow([
-      input(at(1, 'turn/start', { turn: 1 })),
-      input(at(2, 'step/start', { turn: 1, step: 1 })),
+      input(at(SessionSeq(1), 'turn/start', { turn: 1 })),
+      input(at(SessionSeq(2), 'step/start', { turn: 1, step: 1 })),
     ], false)
     assembler.flush()
 
-    assembler.append(input(at(3, 'scope-probe/update', { turn: 1, step: 1, changed: false })))
+    assembler.append(input(at(SessionSeq(3), 'scope-probe/update', { turn: 1, step: 1, changed: false })))
     expect(assembler.flush()).toBe(false)
     expect(apply).not.toHaveBeenCalled()
 
-    assembler.append(input(at(4, 'scope-probe/update', { turn: 1, step: 1, changed: true })))
+    assembler.append(input(at(SessionSeq(4), 'scope-probe/update', { turn: 1, step: 1, changed: true })))
     expect(assembler.flush()).toBe(true)
     expect(apply).toHaveBeenCalledOnce()
   })
diff --git a/packages/client/ui-conversation/tests/conversation-registry.client.spec.ts b/packages/client/ui-conversation/tests/conversation-registry.client.spec.ts
index efb2750518..9805bf189f 100644
--- a/packages/client/ui-conversation/tests/conversation-registry.client.spec.ts
+++ b/packages/client/ui-conversation/tests/conversation-registry.client.spec.ts
@@ -1,5 +1,6 @@
 import { Context } from '@deepseek-ai/cordis'
 import { afterEach, describe, expect, it, vi } from 'vitest'
+import { SessionSeq } from '@deepseek-ai/dsh-session/types'
 import type { SessionEvent, SessionId } from '@deepseek-ai/dsh-session/types'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import {
@@ -181,16 +182,16 @@ describe('Conversation registries', () => {
       source.append({ type: 'event', event })
     }
 
-    append({ seq: 1, time: 1, type: 'turn/start', data: { turn: 1 } })
+    append({ seq: SessionSeq(1), time: 1, type: 'turn/start', data: { turn: 1 } })
     listener.mockClear()
     append({
-      seq: 2,
+      seq: SessionSeq(2),
       time: 2,
       type: 'assistant/chunk',
       data: { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'a' } },
     })
     append({
-      seq: 3,
+      seq: SessionSeq(3),
       time: 3,
       type: 'assistant/chunk',
       data: { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'b' } },
@@ -219,13 +220,13 @@ describe('Conversation registries', () => {
     expect(listener).toHaveBeenCalledOnce()
 
     append({
-      seq: 4,
+      seq: SessionSeq(4),
       time: 4,
       type: 'assistant/chunk',
       data: { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'c' } },
     })
     append({
-      seq: 5,
+      seq: SessionSeq(5),
       time: 5,
       type: 'assistant/message',
       data: { turn: 1, step: 1, message: { id: 'a1', role: 'assistant', content: [] } },