diff --git a/packages/stage-ui/src/stores/chat.ts b/packages/stage-ui/src/stores/chat.ts
index 05fb54018..733b9ebc1 100644
--- a/packages/stage-ui/src/stores/chat.ts
+++ b/packages/stage-ui/src/stores/chat.ts
@@ -286,6 +286,7 @@ export const useChatStore = defineStore('chat', () => {
   function cleanupMessages(sessionId = activeSessionId.value) {
     bumpSessionGeneration(sessionId)
     sessionMessages.value[sessionId] = [generateInitialMessage()]
+    activeContexts.value = {}
 
     // Reject pending sends for this session so callers don't hang after cleanup
     for (const queued of pendingQueuedSends.value) {
@@ -358,7 +359,7 @@ export const useChatStore = defineStore('chat', () => {
     const sendingCreatedAt = Date.now()
     const streamingMessageContext: ChatStreamEventContext = {
       input: { role: 'user', content: sendingMessage, createdAt: sendingCreatedAt },
-      contexts: { ...activeContexts.value },
+      contexts: toRaw(activeContexts.value),
       composedMessage: [],
     }
 
diff --git a/packages/stage-ui/src/stores/mods/api/context-bridge.ts b/packages/stage-ui/src/stores/mods/api/context-bridge.ts
index e276b4357..31d695271 100644
--- a/packages/stage-ui/src/stores/mods/api/context-bridge.ts
+++ b/packages/stage-ui/src/stores/mods/api/context-bridge.ts
@@ -6,7 +6,7 @@ import { isStageTamagotchi, isStageWeb } from '@proj-airi/stage-shared'
 import { useBroadcastChannel } from '@vueuse/core'
 import { Mutex } from 'es-toolkit'
 import { defineStore } from 'pinia'
-import { ref, watch } from 'vue'
+import { ref, watch, toRaw } from 'vue'
 
 import { CHAT_STREAM_CHANNEL_NAME, CONTEXT_CHANNEL_NAME, useChatStore } from '../../chat'
 import { useModsServerChannelStore } from './channel-server'
@@ -37,7 +37,7 @@ export const useContextBridgeStore = defineStore('mods:api:context-bridge', () =
 
       disposeHookFns.value.push(serverChannelStore.onContextUpdate((event) => {
         chatStore.ingestContextMessage({ source: event.source, createdAt: Date.now(), ...event.data })
-        broadcastContext(event.data as ContextMessage)
+        broadcastContext(toRaw(event.data) as ContextMessage)
       }))
 
       disposeHookFns.value.push(
@@ -45,7 +45,7 @@ export const useContextBridgeStore = defineStore('mods:api:context-bridge', () =
           if (isProcessingRemoteStream)
             return
 
-          broadcastStreamEvent({ type: 'before-compose', message, sessionId: chatStore.activeSessionId, context })
+          broadcastStreamEvent({ type: 'before-compose', message, sessionId: chatStore.activeSessionId, context: toRaw(context) })
         }),
         chatStore.onAfterMessageComposed(async (message, context) => {
           if (isProcessingRemoteStream)