diff --git a/packages/client/runtime/src/client/store/index.ts b/packages/client/runtime/src/client/contract/store.ts
similarity index 100%
rename from packages/client/runtime/src/client/store/index.ts
rename to packages/client/runtime/src/client/contract/store.ts
diff --git a/packages/client/runtime/src/client/index.ts b/packages/client/runtime/src/client/index.ts
index a403484280..77b51a68b5 100644
--- a/packages/client/runtime/src/client/index.ts
+++ b/packages/client/runtime/src/client/index.ts
@@ -12,7 +12,7 @@
 import type { Context } from 'cordis'
 import type { ConnectionHandle, SessionId } from '@deepseek-ai/dsh-client-connection/client'
 import type { SnapshotSelectorHook } from '@deepseek-ai/dsh-client-ui-slots'
-import type { SnapshotStore } from './store/index.ts'
+import type { SnapshotStore } from './contract/store.ts'
 import { SlotsService } from './slots.ts'
 import { SessionsService } from './sessions/service.ts'
 import type { SessionListState } from './sessions/service.ts'
@@ -28,10 +28,10 @@ export type { SessionBinding, SessionListState, SessionSummary } from './session
 // The snapshot-store engine lives here since the store migration (the data
 // layer owns its substrate; web-react is React glue only). The './client'
 // main export is the single serving door — no store subpath.
-export { createSnapshotStore, defineStore, shallowEqual } from './store/index.ts'
+export { createSnapshotStore, defineStore, shallowEqual } from './contract/store.ts'
 export type {
   EngineStoreHandle, EngineStoreInstance, ObservableSnapshot, SnapshotStore,
-} from './store/index.ts'
+} from './contract/store.ts'
 export type {
   AssistantBlock, AssistantMessageNode, ContextMessageNode, ConversationNode, ConversationSnapshot,
   PendingInteraction, RunningToolCall, SteeringMessageNode,
diff --git a/packages/client/runtime/src/client/loader/index.ts b/packages/client/runtime/src/client/loader/index.ts
index 1afa4b5eb5..81148a7dfc 100644
--- a/packages/client/runtime/src/client/loader/index.ts
+++ b/packages/client/runtime/src/client/loader/index.ts
@@ -17,7 +17,7 @@
  * load one by one in inject topology.
  */
 import type { Context } from 'cordis'
-import { createSnapshotStore } from '../store/index.ts'
+import { createSnapshotStore } from '../contract/store.ts'
 import type { BootPluginEntry, ClientLoader, LoaderStatus } from '../index.ts'
 
 export type { BootPluginEntry, ClientLoader, LoaderStatus } from '../index.ts'
diff --git a/packages/client/runtime/src/client/sessions/service.ts b/packages/client/runtime/src/client/sessions/service.ts
index eb4983c839..ec63b8f70d 100644
--- a/packages/client/runtime/src/client/sessions/service.ts
+++ b/packages/client/runtime/src/client/sessions/service.ts
@@ -16,8 +16,8 @@
 import type { Context, Fiber } from 'cordis'
 import type { IApiClient, SessionId } from '@deepseek-ai/dsh-client-connection/client'
 import type { SessionCell } from '@deepseek-ai/dsh-client-ui-slots'
-import type { SnapshotStore } from '../store/index.ts'
-import { createSnapshotStore } from '../store/index.ts'
+import type { SnapshotStore } from '../contract/store.ts'
+import { createSnapshotStore } from '../contract/store.ts'
 import { SessionManager } from './manager.ts'
 import type { Session } from './session.ts'
 
diff --git a/packages/client/runtime/src/client/sessions/session.ts b/packages/client/runtime/src/client/sessions/session.ts
index 7330738de8..761aca96c2 100644
--- a/packages/client/runtime/src/client/sessions/session.ts
+++ b/packages/client/runtime/src/client/sessions/session.ts
@@ -7,7 +7,7 @@ import type { ContentBlock } from '@deepseek-ai/dsh-llm/types'
 import type { SessionEvent } from '@deepseek-ai/dsh-session/types'
 import type { HistoryEntry, IApiClient, MuxFrame, RpcError, RpcId, RpcResult, SessionId, ToolEventView } from '@deepseek-ai/dsh-client-connection/client'
 import { transportError } from '@deepseek-ai/dsh-client-connection/client'
-import type { ObservableSnapshot } from '../store/index.ts'
+import type { ObservableSnapshot } from '../contract/store.ts'
 import type {
   ConversationNode, ConversationSnapshot, OpenState, PendingInteraction, PromptError, RunningToolCall,
 } from './conversation.ts'
diff --git a/packages/client/runtime/tests/store.spec.ts b/packages/client/runtime/tests/store.spec.ts
index 22de90c0cf..3abd0483f2 100644
--- a/packages/client/runtime/tests/store.spec.ts
+++ b/packages/client/runtime/tests/store.spec.ts
@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { createSnapshotStore, defineStore, shallowEqual } from '../src/client/store/index.ts'
+import { createSnapshotStore, defineStore, shallowEqual } from '../src/client/contract/store.ts'
 
 interface State {
   a: { n: number }