diff --git a/README.md b/README.md
index 7dc89d4e0b..9807e26680 100644
--- a/README.md
+++ b/README.md
@@ -136,7 +136,13 @@
 > Heavily inspired by [Neuro-sama](https://www.youtube.com/@Neurosama)
 
 > [!TIP]
-> On Windows, you can also install AIRI with [Scoop](https://scoop.sh/):
+> On Windows, you can also install AIRI with [winget](https://learn.microsoft.com/windows/package-manager/winget/):
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> Or install AIRI with [Scoop](https://scoop.sh/):
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/apps/stage-pocket/vite.config.ts b/apps/stage-pocket/vite.config.ts
index 5b2baa86ae..9305131022 100644
--- a/apps/stage-pocket/vite.config.ts
+++ b/apps/stage-pocket/vite.config.ts
@@ -20,10 +20,11 @@ import VueMacros from 'vue-macros/vite'
 import VueRouter from 'vue-router/vite'
 
 import { tryCatch } from '@moeru/std'
-import { Download } from '@proj-airi/unplugin-fetch/vite'
 import { DownloadLive2DSDK } from '@proj-airi/unplugin-live2d-sdk/vite'
 import { defineConfig } from 'vite'
 
+import { downloadWithRetry } from '../stage-tamagotchi/build/downloadWithRetry'
+
 // import { isEnvTruthy } from '@proj-airi/stage-shared'
 function isEnvTruthy(value: string | undefined | null): boolean {
   if (value == null)
@@ -169,10 +170,10 @@ export default defineConfig({
     VueDevTools(),
 
     DownloadLive2DSDK(),
-    Download('https://dist.ayaka.moe/live2d-models/hiyori_free_zh.zip', 'hiyori_free_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-    Download('https://dist.ayaka.moe/live2d-models/hiyori_pro_zh.zip', 'hiyori_pro_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-    Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-    Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/live2d-models/hiyori_free_zh.zip', 'hiyori_free_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/live2d-models/hiyori_pro_zh.zip', 'hiyori_pro_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
 
     ...isEnvTruthy(process.env.VITE_CAP_SYNC_IOS_AFTER_BUILD ?? '')
       ? [{
diff --git a/apps/stage-tamagotchi/build/downloadWithRetry.ts b/apps/stage-tamagotchi/build/downloadWithRetry.ts
new file mode 100644
index 0000000000..ebe33b3bce
--- /dev/null
+++ b/apps/stage-tamagotchi/build/downloadWithRetry.ts
@@ -0,0 +1,119 @@
+import type { Plugin, ResolvedConfig } from 'vite'
+
+import { Buffer } from 'node:buffer'
+import { copyFile, mkdir, stat, writeFile } from 'node:fs/promises'
+import { isAbsolute, join, resolve } from 'node:path'
+
+import { createLogger } from 'vite'
+
+interface DownloadWithRetryOptions {
+  cacheDir?: string
+  parentDir?: false | string
+  retries?: number
+  retryDelayMs?: number
+}
+
+async function exists(path: string): Promise<boolean> {
+  try {
+    await stat(path)
+    return true
+  }
+  catch (error) {
+    if (error instanceof Error && 'code' in error && error.code === 'ENOENT') {
+      return false
+    }
+    throw error
+  }
+}
+
+function resolveOutputDirs(config: ResolvedConfig, options?: DownloadWithRetryOptions) {
+  const cacheDirOption = options?.cacheDir ?? '.cache'
+  const parentDirOption = options?.parentDir ?? config.publicDir ?? config.root
+
+  const cacheDir = isAbsolute(cacheDirOption) ? cacheDirOption : resolve(config.root, cacheDirOption)
+  const parentDir = parentDirOption === false
+    ? config.root
+    : isAbsolute(parentDirOption)
+      ? parentDirOption
+      : resolve(config.root, parentDirOption)
+
+  return { cacheDir, parentDir }
+}
+
+async function fetchArrayBufferWithRetry(url: string, logger: ReturnType<typeof createLogger>, options?: DownloadWithRetryOptions) {
+  const retries = Math.max(0, options?.retries ?? 3)
+  const retryDelayMs = Math.max(0, options?.retryDelayMs ?? 1000)
+
+  for (let attempt = 0; attempt <= retries; attempt += 1) {
+    try {
+      const response = await fetch(url)
+      if (!response.ok) {
+        throw new Error(`download_failed:${response.status}:${response.statusText}:${url}`)
+      }
+      return await response.arrayBuffer()
+    }
+    catch (error) {
+      if (attempt >= retries) {
+        throw error
+      }
+
+      const retryInMs = retryDelayMs * (attempt + 1)
+      logger.warn(`Download failed for ${url} (attempt ${attempt + 1}/${retries + 1}). Retrying in ${retryInMs}ms.`)
+      await new Promise(resolveDelay => setTimeout(resolveDelay, retryInMs))
+    }
+  }
+
+  throw new Error(`unreachable_retry_state:${url}`)
+}
+
+/**
+ * Downloads a remote static asset during Vite config resolution with bounded retries.
+ *
+ * Use when:
+ * - a build depends on a small set of remote demo assets
+ * - transient CDN/TLS socket resets should not fail CI immediately
+ *
+ * Expects:
+ * - stable destination paths inside the Vite app or shared asset tree
+ * - remote content can be cached safely between builds
+ *
+ * Returns:
+ * - a Vite plugin that populates cache/output paths before the build proceeds
+ */
+export function downloadWithRetry(url: string, filename: string, destination: string, options?: DownloadWithRetryOptions): Plugin {
+  return {
+    name: `download-with-retry-${filename}`,
+    async configResolved(config) {
+      const logger = createLogger()
+      const { cacheDir, parentDir } = resolveOutputDirs(config, options)
+      const cachedFile = join(cacheDir, destination, filename)
+      const outputFile = join(parentDir, destination, filename)
+
+      try {
+        if (!(await exists(cachedFile))) {
+          logger.info(`Downloading ${filename}...`)
+          const stream = await fetchArrayBufferWithRetry(url, logger, options)
+          await mkdir(join(cacheDir, destination), { recursive: true })
+          await writeFile(cachedFile, Buffer.from(stream))
+          logger.info(`${filename} downloaded.`)
+        }
+        else {
+          logger.info(`${filename} already exists in cache.`)
+        }
+
+        if (await exists(outputFile)) {
+          logger.info(`${filename} already exists in ${parentDir}.`)
+          return
+        }
+
+        await mkdir(join(parentDir, destination), { recursive: true }).catch(() => {})
+        await copyFile(cachedFile, outputFile)
+        logger.info(`${filename} copied to ${parentDir}.`)
+      }
+      catch (error) {
+        console.error(error)
+        throw error
+      }
+    },
+  }
+}
diff --git a/apps/stage-tamagotchi/electron.vite.config.ts b/apps/stage-tamagotchi/electron.vite.config.ts
index b37474c62d..8f2b649ce6 100644
--- a/apps/stage-tamagotchi/electron.vite.config.ts
+++ b/apps/stage-tamagotchi/electron.vite.config.ts
@@ -12,10 +12,11 @@ import Layouts from 'vite-plugin-vue-layouts'
 import VueMacros from 'vue-macros/vite'
 import VueRouter from 'vue-router/vite'
 
-import { Download } from '@proj-airi/unplugin-fetch'
 import { DownloadLive2DSDK } from '@proj-airi/unplugin-live2d-sdk'
 import { defineConfig } from 'electron-vite'
 
+import { downloadWithRetry } from './build/downloadWithRetry'
+
 const stageUIAssetsRoot = resolve(join(import.meta.dirname, '..', '..', 'packages', 'stage-ui', 'src', 'assets'))
 const sharedCacheDir = resolve(join(import.meta.dirname, '..', '..', '.cache'))
 
@@ -252,10 +253,10 @@ export default defineConfig({
       }),
 
       DownloadLive2DSDK(),
-      Download('https://dist.ayaka.moe/live2d-models/hiyori_free_zh.zip', 'hiyori_free_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-      Download('https://dist.ayaka.moe/live2d-models/hiyori_pro_zh.zip', 'hiyori_pro_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-      Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-      Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+      downloadWithRetry('https://dist.ayaka.moe/live2d-models/hiyori_free_zh.zip', 'hiyori_free_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+      downloadWithRetry('https://dist.ayaka.moe/live2d-models/hiyori_pro_zh.zip', 'hiyori_pro_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+      downloadWithRetry('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+      downloadWithRetry('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
     ],
   },
 })
diff --git a/apps/stage-web/vite.config.ts b/apps/stage-web/vite.config.ts
index ba5c4b35d4..e2de995c91 100644
--- a/apps/stage-web/vite.config.ts
+++ b/apps/stage-web/vite.config.ts
@@ -17,12 +17,13 @@ import VueMacros from 'vue-macros/vite'
 import VueRouter from 'vue-router/vite'
 
 import { tryCatch } from '@moeru/std'
-import { Download } from '@proj-airi/unplugin-fetch/vite'
 import { DownloadLive2DSDK } from '@proj-airi/unplugin-live2d-sdk/vite'
 import { LFS, SpaceCard } from 'hfup/vite'
 import { defineConfig } from 'vite'
 import { VitePWA } from 'vite-plugin-pwa'
 
+import { downloadWithRetry } from '../stage-tamagotchi/build/downloadWithRetry'
+
 const stageUIAssetsRoot = resolve(join(import.meta.dirname, '..', '..', 'packages', 'stage-ui', 'src', 'assets'))
 const sharedCacheDir = resolve(join(import.meta.dirname, '..', '..', '.cache'))
 
@@ -221,10 +222,10 @@ export default defineConfig({
     VueDevTools(),
 
     DownloadLive2DSDK(),
-    Download('https://dist.ayaka.moe/live2d-models/hiyori_free_zh.zip', 'hiyori_free_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-    Download('https://dist.ayaka.moe/live2d-models/hiyori_pro_zh.zip', 'hiyori_pro_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-    Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
-    Download('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/live2d-models/hiyori_free_zh.zip', 'hiyori_free_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/live2d-models/hiyori_pro_zh.zip', 'hiyori_pro_zh.zip', 'live2d/models', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-A/AvatarSample_A.vrm', 'AvatarSample_A.vrm', 'vrm/models/AvatarSample-A', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
+    downloadWithRetry('https://dist.ayaka.moe/vrm-models/VRoid-Hub/AvatarSample-B/AvatarSample_B.vrm', 'AvatarSample_B.vrm', 'vrm/models/AvatarSample-B', { parentDir: stageUIAssetsRoot, cacheDir: sharedCacheDir }),
 
     // HuggingFace Spaces
     LFS({ root: cwd(), extraGlobs: [
diff --git a/docs/README.fr.md b/docs/README.fr.md
index f8f9ceb9a4..9ea15ed111 100644
--- a/docs/README.fr.md
+++ b/docs/README.fr.md
@@ -135,7 +135,13 @@
 > Fortement inspiré par [Neuro-sama](https://www.youtube.com/@Neurosama)
 
 > [!TIP]
-> Sous Windows, vous pouvez également installer AIRI avec [Scoop](https://scoop.sh/) :
+> Sous Windows, vous pouvez installer AIRI avec [winget](https://learn.microsoft.com/windows/package-manager/winget/) :
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> Ou installer AIRI avec [Scoop](https://scoop.sh/) :
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/docs/README.ja-JP.md b/docs/README.ja-JP.md
index dab0756718..84353ce5e9 100644
--- a/docs/README.ja-JP.md
+++ b/docs/README.ja-JP.md
@@ -135,7 +135,13 @@
 > [Neuro-sama](https://www.youtube.com/@Neurosama) に大きな影響を受けました
 
 > [!TIP]
-> Windows では、[Scoop](https://scoop.sh/) でも AIRI をインストールできます：
+> Windows では、[winget](https://learn.microsoft.com/windows/package-manager/winget/) で AIRI をインストールできます：
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> または、[Scoop](https://scoop.sh/) で AIRI をインストールできます：
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/docs/README.ko-KR.md b/docs/README.ko-KR.md
index f4d7d23402..dc76ac0842 100644
--- a/docs/README.ko-KR.md
+++ b/docs/README.ko-KR.md
@@ -135,7 +135,13 @@
 > [Neuro-sama](https://www.youtube.com/@Neurosama)에서 큰 영감을 받았습니다
 
 > [!TIP]
-> Windows에서는 [Scoop](https://scoop.sh/)으로도 AIRI를 설치할 수 있습니다:
+> Windows에서는 [winget](https://learn.microsoft.com/windows/package-manager/winget/)으로 AIRI를 설치할 수 있습니다:
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> 또는 [Scoop](https://scoop.sh/)으로 AIRI를 설치할 수 있습니다:
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/docs/README.ru-RU.md b/docs/README.ru-RU.md
index c1a19eef0b..0f891a85d7 100644
--- a/docs/README.ru-RU.md
+++ b/docs/README.ru-RU.md
@@ -135,7 +135,13 @@
 > Сильно вдохновлено [Neuro-sama](https://www.youtube.com/@Neurosama)
 
 > [!TIP]
-> В Windows AIRI также можно установить с помощью [Scoop](https://scoop.sh/):
+> В Windows AIRI можно установить с помощью [winget](https://learn.microsoft.com/windows/package-manager/winget/):
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> Или установить AIRI через [Scoop](https://scoop.sh/):
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/docs/README.vi.md b/docs/README.vi.md
index f8d1b38cc9..36366ccdb5 100644
--- a/docs/README.vi.md
+++ b/docs/README.vi.md
@@ -135,7 +135,13 @@
 > Lấy cảm hứng mạnh mẽ từ [Neuro-sama](https://www.youtube.com/@Neurosama)
 
 > [!TIP]
-> Trên Windows, bạn cũng có thể cài AIRI bằng [Scoop](https://scoop.sh/):
+> Trên Windows, bạn có thể cài AIRI bằng [winget](https://learn.microsoft.com/windows/package-manager/winget/):
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> Hoặc cài AIRI bằng [Scoop](https://scoop.sh/):
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/docs/README.zh-CN.md b/docs/README.zh-CN.md
index f69fc9d4fc..8bb18b8ad0 100644
--- a/docs/README.zh-CN.md
+++ b/docs/README.zh-CN.md
@@ -135,7 +135,13 @@
 > 深受 [Neuro-sama](https://www.youtube.com/@Neurosama) 启发
 
 > [!TIP]
-> 在 Windows 上，你也可以使用 [Scoop](https://scoop.sh/) 安装 AIRI：
+> 在 Windows 上，你也可以使用 [winget](https://learn.microsoft.com/windows/package-manager/winget/) 安装 AIRI：
+>
+> ```powershell
+> winget install MoeruAI.AIRI
+> ```
+>
+> 或者使用 [Scoop](https://scoop.sh/) 安装 AIRI：
 >
 > ```powershell
 > scoop bucket add airi https://github.com/moeru-ai/airi
diff --git a/packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.test.ts b/packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.test.ts
new file mode 100644
index 0000000000..5dc8745c3e
--- /dev/null
+++ b/packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.test.ts
@@ -0,0 +1,79 @@
+import { describe, expect, it } from 'vitest'
+
+import { sanitizeCloneable } from './context-bridge-sanitize'
+
+describe('sanitizeCloneable', () => {
+  it('preserves cloneable bigint values', () => {
+    const input = {
+      metadata: {
+        count: 3n,
+        nested: [1n, { latest: 5n }],
+      },
+    }
+
+    const sanitized = sanitizeCloneable(input)
+    const cloned = structuredClone(sanitized)
+
+    expect(cloned).toEqual({
+      metadata: {
+        count: 3n,
+        nested: [1n, { latest: 5n }],
+      },
+    })
+  })
+
+  it('preserves structured-cloneable built-ins', async () => {
+    const payload = new Uint8Array([1, 2, 3])
+    const buffer = payload.buffer.slice(0)
+    const blob = new Blob(['hello'])
+    const input = {
+      metadata: {
+        mapping: new Map([['key', 7n]]),
+        seen: new Set(['a', 'b']),
+        payload,
+        buffer,
+        blob,
+      },
+    }
+
+    const sanitized = sanitizeCloneable(input)
+    const cloned = structuredClone(sanitized)
+
+    expect(cloned).toEqual({
+      metadata: {
+        mapping: new Map([['key', 7n]]),
+        seen: new Set(['a', 'b']),
+        payload,
+        buffer,
+        blob,
+      },
+    })
+  })
+
+  it('removes nested non-cloneable values and stays structuredClone-safe', () => {
+    const input = {
+      text: 'vision update',
+      metadata: {
+        safe: 'ok',
+        nested: {
+          window: globalThis,
+          fn: () => 'bad',
+          arr: [1, { keep: true, drop: globalThis }],
+        },
+      },
+    }
+
+    const sanitized = sanitizeCloneable(input)
+    const cloned = structuredClone(sanitized)
+
+    expect(cloned).toEqual({
+      text: 'vision update',
+      metadata: {
+        safe: 'ok',
+        nested: {
+          arr: [1, { keep: true }],
+        },
+      },
+    })
+  })
+})
diff --git a/packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.ts b/packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.ts
new file mode 100644
index 0000000000..e69eca9154
--- /dev/null
+++ b/packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.ts
@@ -0,0 +1,61 @@
+export function sanitizeCloneable(value: unknown, seen = new WeakSet<object>()): unknown {
+  if (value == null)
+    return value
+  if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || typeof value === 'bigint')
+    return value
+  if (typeof value === 'symbol' || typeof value === 'function')
+    return undefined
+
+  const rawValue = value
+
+  if (Array.isArray(rawValue)) {
+    return rawValue
+      .map(item => sanitizeCloneable(item, seen))
+      .filter(item => item !== undefined)
+  }
+
+  if (rawValue instanceof Date)
+    return rawValue.toISOString()
+
+  if (rawValue instanceof RegExp)
+    return rawValue.toString()
+
+  if (typeof rawValue !== 'object')
+    return rawValue
+
+  if (seen.has(rawValue))
+    return undefined
+  seen.add(rawValue)
+
+  if (rawValue instanceof Map) {
+    return new Map(
+      [...rawValue.entries()]
+        .map(([key, nestedValue]) => [
+          sanitizeCloneable(key, seen),
+          sanitizeCloneable(nestedValue, seen),
+        ] as const)
+        .filter(([key, nestedValue]) => key !== undefined && nestedValue !== undefined),
+    )
+  }
+
+  if (rawValue instanceof Set) {
+    return new Set(
+      [...rawValue.values()]
+        .map(item => sanitizeCloneable(item, seen))
+        .filter(item => item !== undefined),
+    )
+  }
+
+  if (ArrayBuffer.isView(rawValue) || rawValue instanceof ArrayBuffer || rawValue instanceof Blob)
+    return rawValue
+
+  const proto = Object.getPrototypeOf(rawValue)
+  if (proto !== Object.prototype && proto !== null)
+    return undefined
+
+  return Object.fromEntries(
+    Object.entries(rawValue)
+      .map(([key, nestedValue]) => [key, sanitizeCloneable(nestedValue, seen)] as const)
+      .filter(([, nestedValue]) => nestedValue !== undefined),
+  )
+}
diff --git a/packages/stage-ui/src/stores/mods/api/context-bridge.contract.browser.test.ts b/packages/stage-ui/src/stores/mods/api/context-bridge.contract.browser.test.ts
index 57ccc7f1c1..b4940d0e9f 100644
--- a/packages/stage-ui/src/stores/mods/api/context-bridge.contract.browser.test.ts
+++ b/packages/stage-ui/src/stores/mods/api/context-bridge.contract.browser.test.ts
@@ -390,6 +390,44 @@ describe('context bridge contract', () => {
    * @example
    * Input context updates record store-ingested and stay in chat input payload.
    */
+  it('sanitizes nested non-cloneable context values before broadcasting stream events', async () => {
+    activeProviderRef.value = 'mock-provider'
+    activeModelRef.value = 'mock-model'
+    getProviderInstanceMock.mockResolvedValueOnce({})
+    const store = useContextBridgeStore()
+    await store.initialize()
+
+    const streamMessages = collectChannelMessages<any>(CHAT_STREAM_CHANNEL_NAME)
+    const unsafeContext = {
+      contexts: {
+        vision: [
+          {
+            text: 'vision update',
+            metadata: {
+              safe: 'ok',
+              nested: { window: globalThis, fn: () => 'bad' },
+            },
+          },
+        ],
+      },
+    }
+
+    await emitHooks(beforeComposeHooks, { role: 'user', content: 'hello' }, unsafeContext)
+    await waitForBroadcastDelivery()
+
+    expect(streamMessages).toHaveLength(1)
+    expect(streamMessages[0].type).toBe('before-compose')
+    expect(streamMessages[0].context.contexts.vision[0]).toEqual({
+      text: 'vision update',
+      metadata: {
+        safe: 'ok',
+        nested: {},
+      },
+    })
+
+    await store.dispose()
+  })
+
   it('records core ingest result for input context updates and forwards accepted updates', async () => {
     chatContextIngestMock.mockReturnValueOnce({
       sourceKey: 'weather:station-1',
@@ -638,4 +676,43 @@ describe('context bridge contract', () => {
 
     await store.dispose()
   })
+
+  it('preserves bigint values in broadcast context snapshots', async () => {
+    const messages = collectChannelMessages<{
+      id: string
+      metadata?: {
+        source?: {
+          id?: string
+          plugin?: { id?: string }
+        }
+      }
+      count?: bigint
+      nested?: Array<{ total?: bigint }>
+    }>(CONTEXT_CHANNEL_NAME)
+
+    const store = useContextBridgeStore()
+    await store.initialize()
+
+    const contextSender = createTestChannel(CONTEXT_CHANNEL_NAME)
+    contextSender.postMessage(createContextMessage({
+      id: 'context-1',
+      metadata: createMetadata('weather', 'station-1'),
+      count: 7n,
+      nested: [{ total: 9n }],
+    }))
+    await waitForBroadcastDelivery()
+
+    expect(messages.at(-1)).toMatchObject({
+      id: 'context-1',
+      metadata: {
+        source: {
+          id: 'station-1',
+        },
+      },
+      count: 7n,
+      nested: [{ total: 9n }],
+    })
+
+    await store.dispose()
+  })
 })
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 c4b7e86b4c..cd17149ca0 100644
--- a/packages/stage-ui/src/stores/mods/api/context-bridge.ts
+++ b/packages/stage-ui/src/stores/mods/api/context-bridge.ts
@@ -26,6 +26,7 @@ import { useLlmStreamingControlStore } from '../../llm-streaming-control'
 import { useConsciousnessStore } from '../../modules/consciousness'
 import { useProvidersStore } from '../../providers'
 import { useModsServerChannelStore } from './channel-server'
+import { sanitizeCloneable } from './context-bridge-sanitize'
 
 export function normalizeContextSnapshot<C extends Pick<ChatStreamEventContext, 'contexts'>>(contexts: C): C {
   return {
@@ -35,7 +36,9 @@ export function normalizeContextSnapshot<C extends Pick<ChatStreamEventContext,
         .entries(toRaw(contexts.contexts))
         .map(([key, ctx]) => [
           key,
-          ctx.map(c => toRaw(c)),
+          ctx
+            .map(c => sanitizeCloneable(c))
+            .filter((value): value is NonNullable<typeof value> => value !== undefined),
         ]),
     ),
   }
diff --git a/vitest.sanitize.config.ts b/vitest.sanitize.config.ts
new file mode 100644
index 0000000000..9094d9fb81
--- /dev/null
+++ b/vitest.sanitize.config.ts
@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    include: ['packages/stage-ui/src/stores/mods/api/context-bridge-sanitize.test.ts'],
+  },
+})