diff --git a/apps/stage-pocket/src/pages/settings/system/developer.vue b/apps/stage-pocket/src/pages/settings/system/developer.vue
index 44e76f0a4..9aaff3cf4 100644
--- a/apps/stage-pocket/src/pages/settings/system/developer.vue
+++ b/apps/stage-pocket/src/pages/settings/system/developer.vue
@@ -80,6 +80,12 @@ const menu = computed(() => [
     icon: 'i-solar:sledgehammer-bold-duotone',
     to: '/devtools/notifications',
   },
+  {
+    title: 'WebSocket Inspector',
+    description: 'Inspect raw WebSocket traffic',
+    icon: 'i-solar:transfer-horizontal-bold-duotone',
+    to: '/devtools/websocket-inspector',
+  },
 ])
 </script>
 
diff --git a/apps/stage-tamagotchi/src/renderer/pages/settings/system/developer.vue b/apps/stage-tamagotchi/src/renderer/pages/settings/system/developer.vue
index 207ad0f2f..a285a3641 100644
--- a/apps/stage-tamagotchi/src/renderer/pages/settings/system/developer.vue
+++ b/apps/stage-tamagotchi/src/renderer/pages/settings/system/developer.vue
@@ -59,6 +59,12 @@ const menu = computed(() => [
     icon: 'i-solar:chart-bold-duotone',
     to: '/devtools/beat-sync',
   },
+  {
+    title: 'WebSocket Inspector',
+    description: 'Inspect raw WebSocket traffic',
+    icon: 'i-solar:transfer-horizontal-bold-duotone',
+    to: '/devtools/websocket-inspector',
+  },
 ])
 
 const openDevTools = useElectronEventaInvoke(electronOpenMainDevtools)
diff --git a/apps/stage-web/src/pages/settings/system/developer.vue b/apps/stage-web/src/pages/settings/system/developer.vue
index 911e7c6e2..9de17ad06 100644
--- a/apps/stage-web/src/pages/settings/system/developer.vue
+++ b/apps/stage-web/src/pages/settings/system/developer.vue
@@ -68,6 +68,12 @@ const menu = computed(() => [
     icon: 'i-solar:chat-square-call-bold-duotone',
     to: '/devtools/context-flow',
   },
+  {
+    title: 'WebSocket Inspector',
+    description: 'Inspect raw WebSocket traffic',
+    icon: 'i-solar:transfer-horizontal-bold-duotone',
+    to: '/devtools/websocket-inspector',
+  },
   {
     title: t('settings.pages.system.sections.section.developer.sections.section.use-magic-keys.title'),
     description: t('settings.pages.system.sections.section.developer.sections.section.use-magic-keys.description'),
diff --git a/packages/server-sdk/src/client.ts b/packages/server-sdk/src/client.ts
index 336f2b21a..de3a8a9f1 100644
--- a/packages/server-sdk/src/client.ts
+++ b/packages/server-sdk/src/client.ts
@@ -30,6 +30,8 @@ export interface ClientOptions<C = undefined> {
   autoConnect?: boolean
   autoReconnect?: boolean
   maxReconnectAttempts?: number
+  onAnyMessage?: (data: WebSocketEvent<C>) => void
+  onAnySend?: (data: WebSocketEvent<C>) => void
 }
 
 function createInstanceId() {
@@ -60,6 +62,8 @@ export class Client<C = undefined> {
 
     this.opts = {
       url: 'ws://localhost:6121/ws',
+      onAnyMessage: () => {},
+      onAnySend: () => {},
       possibleEvents: [],
       onError: () => {},
       onClose: () => {},
@@ -246,6 +250,7 @@ export class Client<C = undefined> {
   private async handleMessage(event: MessageEvent) {
     try {
       const data = JSON.parse(event.data as string) as WebSocketEvent<C>
+      this.opts.onAnyMessage?.(data)
       const listeners = this.eventListeners.get(data.type)
       if (!listeners?.size) {
         return
@@ -299,11 +304,15 @@ export class Client<C = undefined> {
 
   send(data: WebSocketEventOptionalSource<C>): void {
     if (this.websocket && this.connected) {
-      this.websocket.send(JSON.stringify({
+      const payload = {
         source: this.opts.name as WebSocketEventSource | string,
         metadata: { source: this.identity },
         ...data,
-      } as WebSocketEvent<C>))
+      } as WebSocketEvent<C>
+
+      this.opts.onAnySend?.(payload)
+
+      this.websocket.send(JSON.stringify(payload))
     }
   }
 
diff --git a/packages/stage-layouts/src/layouts/settings.vue b/packages/stage-layouts/src/layouts/settings.vue
index d3edb6903..ff04b3433 100644
--- a/packages/stage-layouts/src/layouts/settings.vue
+++ b/packages/stage-layouts/src/layouts/settings.vue
@@ -114,6 +114,10 @@ const routeHeaderMetadataMap = computed(() => {
       subtitle: t('tamagotchi.settings.devtools.title'),
       title: t('tamagotchi.settings.devtools.pages.context-flow.title'),
     },
+    '/devtools/websocket-inspector': {
+      subtitle: t('tamagotchi.settings.devtools.title'),
+      title: 'WebSocket Inspector',
+    },
     '/devtools/performance-visualizer': {
       subtitle: t('settings.title'),
       title: t('settings.pages.system.sections.section.developer.sections.section.performance-visualizer.title'),
diff --git a/packages/stage-pages/src/pages/devtools/websocket-inspector.vue b/packages/stage-pages/src/pages/devtools/websocket-inspector.vue
new file mode 100644
index 000000000..078ca77e5
--- /dev/null
+++ b/packages/stage-pages/src/pages/devtools/websocket-inspector.vue
@@ -0,0 +1,191 @@
+<script setup lang="ts">
+import { useWebSocketInspectorStore } from '@proj-airi/stage-ui/stores/devtools/websocket-inspector'
+import { Button, FieldCheckbox, Input } from '@proj-airi/ui'
+import { computed, nextTick, ref, watch } from 'vue'
+
+const store = useWebSocketInspectorStore()
+
+const filter = ref('')
+const showIncoming = ref(true)
+const showOutgoing = ref(true)
+const showHeartbeats = ref(true)
+const streamContainer = ref<HTMLDivElement>()
+const showingDetails = ref<string>('')
+const filteredHistory = computed(() => {
+  return store.history.filter((item) => {
+    if (!showIncoming.value && item.direction === 'incoming')
+      return false
+    if (!showOutgoing.value && item.direction === 'outgoing')
+      return false
+    if (!showHeartbeats.value && item.event.type === 'transport:connection:heartbeat')
+      return false
+    if (filter.value && !JSON.stringify(item.event).toLowerCase().includes(filter.value.toLowerCase()))
+      return false
+    return true
+  })
+})
+
+function formatTime(ts: number) {
+  return new Date(ts).toLocaleTimeString()
+}
+
+async function scrollToTop() {
+  await nextTick()
+  if (streamContainer.value)
+    streamContainer.value.scrollTop = 0
+}
+
+watch(() => filteredHistory.value.length, scrollToTop)
+
+const directionBadgeClassMap: Record<'incoming' | 'outgoing', string[]> = {
+  incoming: [
+    'bg-pink-100 dark:bg-pink-900',
+    'text-pink-600',
+    'dark:text-pink-300',
+    'border-pink-300 dark:border-pink-900',
+  ],
+  outgoing: [
+    'bg-blue-100 dark:bg-blue-900',
+    'text-blue-600',
+    'dark:text-blue-300',
+    'border-blue-300 dark:border-blue-900',
+  ],
+}
+
+const directionIconClassMap: Record<'incoming' | 'outgoing', string> = {
+  incoming: 'i-solar:arrow-down-linear',
+  outgoing: 'i-solar:arrow-up-linear',
+}
+
+function directionBadgeClasses(direction: 'incoming' | 'outgoing') {
+  return directionBadgeClassMap[direction]
+}
+
+function directionIconClass(direction: 'incoming' | 'outgoing') {
+  return directionIconClassMap[direction]
+}
+
+const cardClassMap: Record<'incoming' | 'outgoing', string[]> = {
+  incoming: [
+    'bg-pink-50',
+    'dark:bg-pink-950',
+    'border-pink-300',
+    'text-pink-700',
+    'dark:border-pink-800',
+    'dark:text-pink-100',
+  ],
+  outgoing: [
+    'bg-blue-50',
+    'dark:bg-blue-950',
+    'border-blue-300',
+    'text-blue-700',
+    'dark:border-blue-800',
+    'dark:text-blue-100',
+  ],
+}
+
+function cardClasses(direction: 'incoming' | 'outgoing') {
+  return cardClassMap[direction]
+}
+
+const payloadClassMap: Record<'incoming' | 'outgoing', string[]> = {
+  incoming: [
+    'bg-pink-100',
+    'border-pink-300 border-1 border-solid',
+    'dark:bg-pink-900',
+    'dark:border-pink-700',
+  ],
+  outgoing: [
+    'bg-blue-100',
+    'border-blue-300 border-1 border-solid',
+    'dark:bg-blue-900',
+    'dark:border-blue-700',
+  ],
+}
+
+function payloadClasses(direction: 'incoming' | 'outgoing') {
+  return payloadClassMap[direction]
+}
+</script>
+
+<template>
+  <div class="h-full flex flex-col gap-4 overflow-hidden p-4">
+    <!-- Header / Filters -->
+    <div class="flex flex-col gap-4 rounded-xl bg-neutral-50 p-4 dark:bg-[rgba(0,0,0,0.3)]">
+      <div class="flex items-center gap-2">
+        <FieldCheckbox v-model="showIncoming" label="Incoming" />
+        <FieldCheckbox v-model="showOutgoing" label="Outgoing" />
+        <FieldCheckbox v-model="showHeartbeats" label="Heartbeats" />
+      </div>
+
+      <div class="flex gap-2">
+        <Input
+          v-model="filter"
+          placeholder="Filter payload..."
+          class="w-64"
+        />
+        <Button
+          label="Clear"
+          icon="i-solar:trash-bin-trash-bold-duotone"
+          size="sm"
+          variant="ghost"
+          @click="store.clear()"
+        />
+        <div class="flex flex-shrink-0 items-center text-xs">
+          {{ filteredHistory.length }} / {{ store.history.length }}
+        </div>
+      </div>
+    </div>
+
+    <!-- Stream -->
+    <div
+      ref="streamContainer"
+      class="flex-1 overflow-y-auto rounded-xl bg-white/70 dark:bg-neutral-950/50"
+    >
+      <div
+        v-if="filteredHistory.length === 0"
+        class="h-full w-full flex justify-center p-3 text-sm"
+      >
+        No messages found.
+      </div>
+      <div v-else class="grid gap-3">
+        <div
+          v-for="item in filteredHistory"
+          :key="item.id"
+          class="border rounded-xl p-4 transition-colors"
+          :class="cardClasses(item.direction)"
+        >
+          <div class="flex items-start justify-between gap-3">
+            <div class="flex flex-wrap items-center gap-2 text-sm">
+              <span :class="['rounded-full', 'border', 'px-2', 'py-0.5', 'text-xs', 'flex', 'items-center', 'justify-center', ...directionBadgeClasses(item.direction)]">
+                <span :class="['size-3.5', directionIconClass(item.direction)]" :aria-label="item.direction" />
+                <span class="ml-1 font-bold tracking-wider uppercase">{{ item.direction }}</span>
+              </span>
+              <span class="font-semibold">
+                {{ item.event.type }}
+              </span>
+            </div>
+            <span class="text-sm font-mono">
+              {{ formatTime(item.timestamp) }}
+            </span>
+          </div>
+
+          <details class="group mt-2" :open="showingDetails === item.id">
+            <summary class="cursor-pointer select-none text-sm font-medium" @click="showingDetails = showingDetails === item.id ? '' : item.id">
+              Payload
+            </summary>
+            <pre
+              class="mt-2 w-full overflow-auto whitespace-pre-wrap rounded-lg p-3 text-sm"
+              :class="payloadClasses(item.direction)"
+            >{{ JSON.stringify(item.event, null, 2) }}</pre>
+          </details>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<route lang="yaml">
+meta:
+  layout: settings
+</route>
diff --git a/packages/stage-ui/src/stores/devtools/websocket-inspector.ts b/packages/stage-ui/src/stores/devtools/websocket-inspector.ts
new file mode 100644
index 000000000..fb96d1f3f
--- /dev/null
+++ b/packages/stage-ui/src/stores/devtools/websocket-inspector.ts
@@ -0,0 +1,46 @@
+import type { WebSocketEvent } from '@proj-airi/server-sdk'
+
+import { nanoid } from 'nanoid'
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+
+export interface WebSocketHistoryItem {
+  id: string
+  timestamp: number
+  direction: 'incoming' | 'outgoing'
+  event: WebSocketEvent
+}
+
+export const useWebSocketInspectorStore = defineStore('devtools:websocket-inspector', () => {
+  const history = ref<WebSocketHistoryItem[]>([])
+  const isEnabled = ref(true)
+  const maxHistory = ref(1000)
+
+  function add(direction: 'incoming' | 'outgoing', event: WebSocketEvent) {
+    if (!isEnabled.value)
+      return
+
+    history.value.unshift({
+      id: nanoid(),
+      timestamp: Date.now(),
+      direction,
+      event,
+    })
+
+    if (history.value.length > maxHistory.value) {
+      history.value.pop()
+    }
+  }
+
+  function clear() {
+    history.value = []
+  }
+
+  return {
+    history,
+    isEnabled,
+    maxHistory,
+    add,
+    clear,
+  }
+})
diff --git a/packages/stage-ui/src/stores/mods/api/channel-server.ts b/packages/stage-ui/src/stores/mods/api/channel-server.ts
index dc6693a8a..b65285a09 100644
--- a/packages/stage-ui/src/stores/mods/api/channel-server.ts
+++ b/packages/stage-ui/src/stores/mods/api/channel-server.ts
@@ -6,6 +6,8 @@ import { nanoid } from 'nanoid'
 import { defineStore } from 'pinia'
 import { ref } from 'vue'
 
+import { useWebSocketInspectorStore } from '../../devtools/websocket-inspector'
+
 export const useModsServerChannelStore = defineStore('mods:channels:proj-airi:server', () => {
   const connected = ref(false)
   const client = ref<Client>()
@@ -48,6 +50,12 @@ export const useModsServerChannelStore = defineStore('mods:channels:proj-airi:se
         url: import.meta.env.VITE_AIRI_WS_URL || 'ws://localhost:6121/ws',
         token: options?.token,
         possibleEvents,
+        onAnyMessage: (event) => {
+          useWebSocketInspectorStore().add('incoming', event)
+        },
+        onAnySend: (event) => {
+          useWebSocketInspectorStore().add('outgoing', event)
+        },
         onError: (error) => {
           connected.value = false
           initializing.value = null
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 31d695271..e498f8f0c 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, toRaw } from 'vue'
+import { ref, toRaw, watch } from 'vue'
 
 import { CHAT_STREAM_CHANNEL_NAME, CONTEXT_CHANNEL_NAME, useChatStore } from '../../chat'
 import { useModsServerChannelStore } from './channel-server'
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 29c787c80..248693b31 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2919,7 +2919,7 @@ importers:
         version: 66.5.11
       '@wxt-dev/module-vue':
         specifier: ^1.0.3
-        version: 1.0.3(vite@8.0.0-beta.5(@types/node@24.10.4)(esbuild@0.25.12)(jiti@2.6.1)(less@4.5.1)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))(wxt@0.20.13(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(rollup@4.54.0)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))
+        version: 1.0.3(vite@7.3.0(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))(wxt@0.20.13(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(rollup@4.54.0)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))
       vue-tsc:
         specifier: ^3.1.8
         version: 3.2.1(typescript@5.9.3)
@@ -22215,12 +22215,6 @@ snapshots:
       vite: 7.3.0(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2)
       vue: 3.5.25(typescript@5.9.3)
 
-  '@vitejs/plugin-vue@6.0.3(vite@8.0.0-beta.5(@types/node@24.10.4)(esbuild@0.25.12)(jiti@2.6.1)(less@4.5.1)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))':
-    dependencies:
-      '@rolldown/pluginutils': 1.0.0-beta.53
-      vite: 8.0.0-beta.5(@types/node@24.10.4)(esbuild@0.25.12)(jiti@2.6.1)(less@4.5.1)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2)
-      vue: 3.5.25(typescript@5.9.3)
-
   '@vitest/browser-playwright@4.0.16(bufferutil@4.1.0)(playwright@1.57.0)(utf-8-validate@5.0.10)(vite@7.3.0(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vitest@4.0.16)':
     dependencies:
       '@vitest/browser': 4.0.16(bufferutil@4.1.0)(utf-8-validate@5.0.10)(vite@7.3.0(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vitest@4.0.16)
@@ -22967,9 +22961,9 @@ snapshots:
       '@types/filesystem': 0.0.36
       '@types/har-format': 1.2.16
 
-  '@wxt-dev/module-vue@1.0.3(vite@8.0.0-beta.5(@types/node@24.10.4)(esbuild@0.25.12)(jiti@2.6.1)(less@4.5.1)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))(wxt@0.20.13(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(rollup@4.54.0)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))':
+  '@wxt-dev/module-vue@1.0.3(vite@7.3.0(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))(wxt@0.20.13(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(rollup@4.54.0)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))':
     dependencies:
-      '@vitejs/plugin-vue': 6.0.3(vite@8.0.0-beta.5(@types/node@24.10.4)(esbuild@0.25.12)(jiti@2.6.1)(less@4.5.1)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))
+      '@vitejs/plugin-vue': 6.0.3(vite@7.3.0(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2))(vue@3.5.25(typescript@5.9.3))
       wxt: 0.20.13(@types/node@24.10.4)(jiti@2.6.1)(less@4.5.1)(lightningcss@1.30.2)(rollup@4.54.0)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2)
     transitivePeerDependencies:
       - vite