diff --git a/apps/stage-tamagotchi/src/main/libs/electron/persistence.ts b/apps/stage-tamagotchi/src/main/libs/electron/persistence.ts
new file mode 100644
index 000000000..95b678dfb
--- /dev/null
+++ b/apps/stage-tamagotchi/src/main/libs/electron/persistence.ts
@@ -0,0 +1,162 @@
+import type { BaseIssue, BaseSchema, InferIssue, InferOutput } from 'valibot'
+
+import { existsSync, readFileSync } from 'node:fs'
+import { writeFile } from 'node:fs/promises'
+import { join } from 'node:path'
+
+import { safeDestr } from 'destr'
+import { app } from 'electron'
+import { throttle } from 'es-toolkit'
+import { safeParse } from 'valibot'
+
+type ConfigStatus = 'ok' | 'missing' | 'invalid' | 'read-error'
+
+export interface ConfigDiagnostics<T> {
+  status: ConfigStatus
+  path: string
+  issues?: BaseIssue<unknown>[]
+  error?: unknown
+  raw?: string
+  healed?: boolean
+  value?: T
+}
+
+export interface CreateConfigOptions<T> {
+  default?: T
+  autoHeal?: boolean
+  onValidationFailure?: (diagnostics: ConfigDiagnostics<T>) => void
+  onReadError?: (diagnostics: ConfigDiagnostics<T>) => void
+}
+
+const persistenceMap = new Map<string, unknown>()
+const diagnosticsMap = new Map<string, ConfigDiagnostics<unknown>>()
+
+function createConfigPath(namespace: string, filename: string) {
+  return join(app.getPath('userData'), `${namespace}-${filename}`)
+}
+
+type PersistedSchema = BaseSchema<unknown, unknown, BaseIssue<unknown>>
+
+function parseWithSchema<TSchema extends PersistedSchema>(
+  raw: string,
+  schema: TSchema,
+): { value?: InferOutput<TSchema>, issues?: InferIssue<TSchema>[] } {
+  const parsed = safeDestr<unknown>(raw)
+  const result = safeParse(schema, parsed)
+  if (result.success) {
+    return { value: result.output }
+  }
+  return { issues: result.issues }
+}
+
+export function createConfig<TSchema extends PersistedSchema>(
+  namespace: string,
+  filename: string,
+  schema: TSchema,
+  options?: CreateConfigOptions<InferOutput<TSchema>>,
+) {
+  const key = `${namespace}:${filename}`
+  const autoHeal = options?.autoHeal ?? Boolean(options?.default)
+
+  const configPath = () => createConfigPath(namespace, filename)
+
+  const recordDiagnostics = (diagnostics: ConfigDiagnostics<InferOutput<TSchema>>) => {
+    diagnosticsMap.set(key, diagnostics)
+    return diagnostics
+  }
+
+  const save = throttle(async () => {
+    try {
+      await writeFile(configPath(), JSON.stringify(persistenceMap.get(key)))
+    }
+    catch (error) {
+      console.error('Failed to save config', error)
+    }
+  }, 250)
+
+  const writeHealingConfig = async (value: InferOutput<TSchema>) => {
+    try {
+      await writeFile(configPath(), JSON.stringify(value))
+      return true
+    }
+    catch (error) {
+      console.error('Failed to heal config', error)
+      return false
+    }
+  }
+
+  const setup = () => {
+    const path = configPath()
+    if (!existsSync(path)) {
+      const diagnostics = recordDiagnostics({
+        status: 'missing',
+        path,
+        value: options?.default,
+      })
+      persistenceMap.set(key, options?.default)
+      return diagnostics
+    }
+
+    try {
+      const raw = readFileSync(path, { encoding: 'utf-8' })
+      const parsed = parseWithSchema(raw, schema)
+      if (parsed.value !== undefined) {
+        const diagnostics = recordDiagnostics({
+          status: 'ok',
+          path,
+          value: parsed.value,
+        })
+        persistenceMap.set(key, parsed.value)
+        return diagnostics
+      }
+
+      const fallback = options?.default
+      const diagnostics = recordDiagnostics({
+        status: 'invalid',
+        path,
+        issues: parsed.issues,
+        raw,
+        value: fallback,
+      })
+      options?.onValidationFailure?.(diagnostics)
+      persistenceMap.set(key, fallback)
+
+      if (autoHeal && fallback !== undefined) {
+        void writeHealingConfig(fallback).then((healed) => {
+          if (healed) {
+            diagnosticsMap.set(key, { ...diagnostics, healed })
+          }
+        })
+      }
+      return diagnostics
+    }
+    catch (error) {
+      const fallback = options?.default
+      const diagnostics = recordDiagnostics({
+        status: 'read-error',
+        path,
+        error,
+        value: fallback,
+      })
+      options?.onReadError?.(diagnostics)
+      persistenceMap.set(key, fallback)
+      return diagnostics
+    }
+  }
+
+  const update = (newData: InferOutput<TSchema>) => {
+    persistenceMap.set(key, newData)
+    save()
+  }
+
+  const get = () => persistenceMap.get(key) as InferOutput<TSchema> | undefined
+
+  const getDiagnostics = () => diagnosticsMap.get(key) as ConfigDiagnostics<InferOutput<TSchema>> | undefined
+
+  return {
+    setup,
+    get,
+    update,
+    getDiagnostics,
+  }
+}
diff --git a/apps/stage-tamagotchi/src/main/windows/caption/index.ts b/apps/stage-tamagotchi/src/main/windows/caption/index.ts
index c040a87e1..e7f8c8e4a 100644
--- a/apps/stage-tamagotchi/src/main/windows/caption/index.ts
+++ b/apps/stage-tamagotchi/src/main/windows/caption/index.ts
@@ -1,4 +1,5 @@
 import type { BrowserWindow, BrowserWindowConstructorOptions, Rectangle } from 'electron'
+import type { InferOutput } from 'valibot'
 
 import { createHash } from 'node:crypto'
 import { join, resolve } from 'node:path'
@@ -9,26 +10,34 @@ import { animate, utils } from 'animejs'
 import { BrowserWindow as ElectronBrowserWindow, ipcMain, screen, shell } from 'electron'
 import { debounce, throttle } from 'es-toolkit'
 import { isMacOS } from 'std-env'
+import { boolean, number, object, optional, record, string } from 'valibot'
 
 import icon from '../../../../resources/icon.png?asset'
 
 import { captionGetIsFollowingWindow, captionIsFollowingWindowChanged } from '../../../shared/eventa'
 import { baseUrl, getElectronMainDirname, load, withHashRoute } from '../../libs/electron/location'
+import { createConfig } from '../../libs/electron/persistence'
 import { createReusableWindow } from '../../libs/electron/window-manager'
 import { setupBaseWindowElectronInvokes } from '../main/rpc/index.electron'
 import { mapForBreakpoints, resolutionBreakpoints, widthFrom } from '../shared/display'
-import { createConfig } from '../shared/persistence'
 import { transparentWindowConfig } from '../shared/window'
 
-interface CaptionMatrixConfig {
-  bounds: Rectangle
-  relativeToMain?: { dx: number, dy: number }
-}
-
-interface CaptionConfig {
-  isFollowing: boolean
-  matrices: Record<string, CaptionMatrixConfig>
-}
+const captionConfigSchema = object({
+  isFollowing: boolean(),
+  matrices: record(string(), object({
+    bounds: object({
+      x: number(),
+      y: number(),
+      width: number(),
+      height: number(),
+    }),
+    relativeToMain: optional(object({
+      dx: number(),
+      dy: number(),
+    })),
+  })),
+})
+type CaptionConfig = InferOutput<typeof captionConfigSchema>
 
 function computeDisplayMatrixHash(): string {
   const displays = screen.getAllDisplays()
@@ -139,13 +148,17 @@ export function setupCaptionWindowManager(params: { mainWindow: BrowserWindow })
 
   const {
     setup: setupConfig,
-    get: getConfig,
+    get: getConfigRaw,
     update: updateConfig,
-  } = createConfig<CaptionConfig>('windows-caption', 'config.json', { default: { isFollowing: true, matrices: {} } })
+  } = createConfig('windows-caption', 'config.json', captionConfigSchema, {
+    default: { isFollowing: true, matrices: {} },
+    autoHeal: true,
+  })
+  const getConfig = (): CaptionConfig => getConfigRaw() ?? { isFollowing: true, matrices: {} }
 
   setupConfig()
 
-  let isFollowing = getConfig()?.isFollowing ?? true
+  let isFollowing = getConfig().isFollowing ?? true
   let lastProgrammaticMoveAt = 0
 
   // Keep references to listeners so we can detach when toggling
diff --git a/apps/stage-tamagotchi/src/main/windows/main/index.ts b/apps/stage-tamagotchi/src/main/windows/main/index.ts
index 43d48b5d1..479e4e44a 100644
--- a/apps/stage-tamagotchi/src/main/windows/main/index.ts
+++ b/apps/stage-tamagotchi/src/main/windows/main/index.ts
@@ -1,4 +1,5 @@
-import type { BrowserWindowConstructorOptions, Rectangle } from 'electron'
+import type { Rectangle } from 'electron'
+import type { InferOutput } from 'valibot'
 
 import type { AutoUpdater } from '../../services/electron/auto-updater'
 import type { NoticeWindowManager } from '../notice'
@@ -17,18 +18,28 @@ import { initScreenCaptureForWindow } from '@proj-airi/electron-screen-capture/m
 import { defu } from 'defu'
 import { BrowserWindow, ipcMain, shell } from 'electron'
 import { isLinux, isMacOS } from 'std-env'
+import { array, number, object, optional, string } from 'valibot'
 
 import icon from '../../../../resources/icon.png?asset'
 
 import { electronStartDraggingWindow } from '../../../shared/eventa'
 import { baseUrl, getElectronMainDirname, load } from '../../libs/electron/location'
+import { createConfig } from '../../libs/electron/persistence'
 import { transparentWindowConfig } from '../shared'
-import { createConfig } from '../shared/persistence'
 import { setupMainWindowElectronInvokes } from './rpc/index.electron'
 
-interface AppConfig {
-  windows?: Array<Pick<BrowserWindowConstructorOptions, 'title' | 'x' | 'y' | 'width' | 'height'> & { tag: string }>
-}
+const appConfigSchema = object({
+  windows: optional(array(object({
+    title: optional(string()),
+    tag: string(),
+    x: optional(number()),
+    y: optional(number()),
+    width: optional(number()),
+    height: optional(number()),
+  }))),
+})
+
+type AppConfig = InferOutput<typeof appConfigSchema>
 
 export async function setupMainWindow(params: {
   settingsWindow: () => Promise<BrowserWindow>
@@ -40,13 +51,17 @@ export async function setupMainWindow(params: {
 }) {
   const {
     setup: setupConfig,
-    get: getConfig,
+    get: getConfigRaw,
     update: updateConfig,
-  } = createConfig<AppConfig>('app', 'config.json', { default: { windows: [] } })
+  } = createConfig('app', 'config.json', appConfigSchema, {
+    default: { windows: [] },
+    autoHeal: true,
+  })
+  const getConfig = (): AppConfig => getConfigRaw() ?? { windows: [] }
 
   setupConfig()
 
-  const mainWindowConfig = getConfig()?.windows?.find(w => w.title === 'AIRI' && w.tag === 'main')
+  const mainWindowConfig = getConfig().windows?.find(w => w.title === 'AIRI' && w.tag === 'main')
 
   const window = new BrowserWindow({
     title: 'AIRI',
@@ -83,7 +98,7 @@ export async function setupMainWindow(params: {
   }
 
   function handleNewBounds(newBounds: Rectangle) {
-    const config = getConfig()!
+    const config = getConfig()
     if (!config.windows || !Array.isArray(config.windows)) {
       config.windows = []
     }
diff --git a/apps/stage-tamagotchi/src/main/windows/shared/persistence.ts b/apps/stage-tamagotchi/src/main/windows/shared/persistence.ts
index f83bcb3fc..e60bba1dd 100644
--- a/apps/stage-tamagotchi/src/main/windows/shared/persistence.ts
+++ b/apps/stage-tamagotchi/src/main/windows/shared/persistence.ts
@@ -1,59 +1,2 @@
-import { existsSync, readFileSync } from 'node:fs'
-import { writeFile } from 'node:fs/promises'
-import { join } from 'node:path'
-
-import { safeDestr } from 'destr'
-import { app } from 'electron'
-import { throttle } from 'es-toolkit'
-
-function parseOrFallback<T>(config: string, fallback: T | undefined): T | undefined {
-  try {
-    const parsed = safeDestr<T>(config)
-    return parsed ?? fallback
-  }
-  catch (error) {
-    console.warn('Invalid config persisted to disk, resetting to default', error)
-    return fallback
-  }
-}
-
-const persistenceMap = new Map<string, any>()
-
-export function createConfig<T>(namespace: string, filename: string, options?: { default?: T }) {
-  function configPath() {
-    const path = join(app.getPath('userData'), `${namespace}-${filename}`)
-    return path
-  }
-
-  function setup() {
-    const path = configPath()
-    const data = existsSync(path)
-      ? parseOrFallback<T>(readFileSync(configPath(), { encoding: 'utf-8' }), options?.default)
-      : options?.default
-    persistenceMap.set(`${namespace}-${filename}`, data)
-  }
-
-  const save = throttle(async () => {
-    try {
-      await writeFile(configPath(), JSON.stringify(persistenceMap.get(`${namespace}-${filename}`)))
-    }
-    catch (e) {
-      console.error('Failed to save config', e)
-    }
-  }, 250)
-
-  function update(newData: T) {
-    persistenceMap.set(`${namespace}-${filename}`, newData)
-    save()
-  }
-
-  function get(): T | undefined {
-    return persistenceMap.get(`${namespace}-${filename}`) as T | undefined
-  }
-
-  return {
-    setup,
-    get,
-    update,
-  }
-}
+export { createConfig } from '../../libs/electron/persistence'
+export type { ConfigDiagnostics, CreateConfigOptions } from '../../libs/electron/persistence'
diff --git a/apps/stage-tamagotchi/src/main/windows/widgets/index.ts b/apps/stage-tamagotchi/src/main/windows/widgets/index.ts
index b62443215..8cb417fa5 100644
--- a/apps/stage-tamagotchi/src/main/windows/widgets/index.ts
+++ b/apps/stage-tamagotchi/src/main/windows/widgets/index.ts
@@ -1,4 +1,5 @@
 import type { BrowserWindow, Rectangle } from 'electron'
+import type { InferOutput } from 'valibot'
 
 import type { WidgetsAddPayload, WidgetSnapshot } from '../../../shared/eventa'
 
@@ -7,13 +8,14 @@ import { join, resolve } from 'node:path'
 import { createContext } from '@moeru/eventa/adapters/electron/main'
 import { BrowserWindow as ElectronBrowserWindow, ipcMain, screen, shell } from 'electron'
 import { isMacOS } from 'std-env'
+import { number, object, optional } from 'valibot'
 
 import icon from '../../../../resources/icon.png?asset'
 
 import { widgetsClearEvent, widgetsRemoveEvent, widgetsRenderEvent, widgetsUpdateEvent } from '../../../shared/eventa'
 import { baseUrl, getElectronMainDirname, load, withHashRoute } from '../../libs/electron/location'
+import { createConfig } from '../../libs/electron/persistence'
 import { createReusableWindow } from '../../libs/electron/window-manager'
-import { createConfig } from '../shared/persistence'
 import { spotlightLikeWindowConfig, transparentWindowConfig } from '../shared/window'
 import { setupWidgetsWindowInvokes } from './rpc/index.electron'
 
@@ -28,9 +30,16 @@ export interface WidgetsWindowManager {
   prepareWidgetWindow: (options?: { id?: string }) => string
 }
 
-interface WidgetsWindowConfig {
-  bounds?: Rectangle
-}
+const widgetsWindowConfigSchema = object({
+  bounds: optional(object({
+    x: number(),
+    y: number(),
+    width: number(),
+    height: number(),
+  })),
+})
+
+type WidgetsWindowConfig = InferOutput<typeof widgetsWindowConfigSchema>
 
 function computeDefaultBounds(): Rectangle {
   const primary = screen.getPrimaryDisplay().workArea
@@ -85,7 +94,11 @@ interface WidgetWindowContext {
 }
 
 export function setupWidgetsWindowManager(): WidgetsWindowManager {
-  const { setup, get, update } = createConfig<WidgetsWindowConfig>('windows-widgets', 'config.json', { default: {} })
+  const { setup, get: getConfigRaw, update } = createConfig('windows-widgets', 'config.json', widgetsWindowConfigSchema, {
+    default: {},
+    autoHeal: true,
+  })
+  const getConfig = (): WidgetsWindowConfig => getConfigRaw() ?? {}
   setup()
 
   let eventaContext: ReturnType<typeof createContext>['context'] | undefined
@@ -110,7 +123,7 @@ export function setupWidgetsWindowManager(): WidgetsWindowManager {
     const { context } = createContext(ipcMain, window)
     eventaContext = context
 
-    const saved = get()?.bounds
+    const saved = getConfig().bounds
     if (saved) {
       const work = screen.getDisplayMatching(saved).workArea
       const clamped: Rectangle = {