diff --git a/packages/electron-eventa/README.md b/packages/electron-eventa/README.md
new file mode 100644
index 000000000..51cb92ae6
--- /dev/null
+++ b/packages/electron-eventa/README.md
@@ -0,0 +1,8 @@
+# @proj-airi/electron-eventa
+
+Shared Eventa contract definitions for Electron IPC across AIRI apps.
+
+## Exports
+
+- `@proj-airi/electron-eventa`: core Electron contracts (`electron`, `bounds`, `cursorScreenPoint`, etc.)
+- `@proj-airi/electron-eventa/electron-updater`: auto-updater contracts and state types
diff --git a/packages/electron-eventa/package.json b/packages/electron-eventa/package.json
new file mode 100644
index 000000000..58e2c737b
--- /dev/null
+++ b/packages/electron-eventa/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "@proj-airi/electron-eventa",
+  "type": "module",
+  "version": "0.8.5-beta.3",
+  "private": true,
+  "description": "Shared Eventa contracts for Electron IPC",
+  "author": {
+    "name": "Moeru AI Project AIRI Team",
+    "email": "airi@moeru.ai",
+    "url": "https://github.com/moeru-ai"
+  },
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/moeru-ai/airi.git",
+    "directory": "packages/electron-eventa"
+  },
+  "exports": {
+    ".": "./dist/index.mjs",
+    "./electron": "./dist/electron/index.mjs",
+    "./electron-updater": "./dist/electron-updater/index.mjs",
+    "./package.json": "./package.json"
+  },
+  "types": "./dist/index.d.mts",
+  "scripts": {
+    "dev": "pnpm run build",
+    "build": "tsdown",
+    "typecheck": "tsc --noEmit"
+  },
+  "peerDependencies": {
+    "electron": ">=39 <41"
+  },
+  "dependencies": {
+    "@moeru/eventa": "^1.0.0-beta.1",
+    "builder-util-runtime": "catalog:"
+  }
+}
diff --git a/packages/electron-eventa/src/electron-updater/index.ts b/packages/electron-eventa/src/electron-updater/index.ts
new file mode 100644
index 000000000..79edae907
--- /dev/null
+++ b/packages/electron-eventa/src/electron-updater/index.ts
@@ -0,0 +1,40 @@
+import type { UpdateInfo } from 'builder-util-runtime'
+
+import { defineEventa, defineInvokeEventa } from '@moeru/eventa'
+
+export type AutoUpdaterStatus
+  = | 'idle'
+    | 'disabled'
+    | 'checking'
+    | 'available'
+    | 'not-available'
+    | 'downloading'
+    | 'downloaded'
+    | 'error'
+
+export interface AutoUpdaterProgress {
+  percent: number
+  bytesPerSecond: number
+  transferred: number
+  total: number
+}
+
+export interface AutoUpdaterError {
+  message: string
+}
+
+export interface AutoUpdaterState {
+  status: AutoUpdaterStatus
+  info?: Omit<UpdateInfo, 'path' | 'sha512'>
+  progress?: AutoUpdaterProgress
+  error?: AutoUpdaterError
+}
+
+export const electronAutoUpdaterStateChanged = defineEventa<AutoUpdaterState>('eventa:event:electron:auto-updater:state-changed')
+
+export const autoUpdater = {
+  getState: defineInvokeEventa<AutoUpdaterState>('eventa:invoke:electron:auto-updater:get-state'),
+  checkForUpdates: defineInvokeEventa<AutoUpdaterState>('eventa:invoke:electron:auto-updater:check-for-updates'),
+  downloadUpdate: defineInvokeEventa<AutoUpdaterState>('eventa:invoke:electron:auto-updater:download-update'),
+  quitAndInstall: defineInvokeEventa<void>('eventa:invoke:electron:auto-updater:quit-and-install'),
+}
diff --git a/packages/electron-eventa/src/electron/app.ts b/packages/electron-eventa/src/electron/app.ts
new file mode 100644
index 000000000..aa141be81
--- /dev/null
+++ b/packages/electron-eventa/src/electron/app.ts
@@ -0,0 +1,11 @@
+import { defineInvokeEventa } from '@moeru/eventa'
+
+const isMacOS = defineInvokeEventa<boolean>('eventa:invoke:electron:app:is-macos')
+const isWindows = defineInvokeEventa<boolean>('eventa:invoke:electron:app:is-windows')
+const isLinux = defineInvokeEventa<boolean>('eventa:invoke:electron:app:is-linux')
+
+export const app = {
+  isMacOS,
+  isWindows,
+  isLinux,
+}
diff --git a/packages/electron-eventa/src/electron/index.ts b/packages/electron-eventa/src/electron/index.ts
new file mode 100644
index 000000000..6657e13b5
--- /dev/null
+++ b/packages/electron-eventa/src/electron/index.ts
@@ -0,0 +1,15 @@
+import { app } from './app'
+import { screen } from './screen'
+import { systemPreferences } from './system-preferences'
+import { window } from './window'
+
+export { cursorScreenPoint, startLoopGetCursorScreenPoint } from './screen'
+export { bounds, startLoopGetBounds } from './window'
+export type { BackgroundMaterialType, ResizeDirection, VibrancyType } from './window'
+
+export const electron = {
+  screen,
+  window,
+  systemPreferences,
+  app,
+}
diff --git a/packages/electron-eventa/src/electron/screen.ts b/packages/electron-eventa/src/electron/screen.ts
new file mode 100644
index 000000000..7587c2f40
--- /dev/null
+++ b/packages/electron-eventa/src/electron/screen.ts
@@ -0,0 +1,24 @@
+import type { Display, screen as electronScreen, Point } from 'electron'
+
+import { defineEventa, defineInvokeEventa } from '@moeru/eventa'
+
+export const cursorScreenPoint = defineEventa<Point>('eventa:event:electron:screen:cursor-screen-point')
+export const startLoopGetCursorScreenPoint = defineInvokeEventa('eventa:event:electron:screen:start-loop-get-cursor-screen-point')
+
+const getAllDisplays = defineInvokeEventa<Display[]>('eventa:invoke:electron:screen:get-all-displays')
+const getPrimaryDisplay = defineInvokeEventa<Display>('eventa:invoke:electron:screen:get-primary-display')
+const getCursorScreenPoint = defineInvokeEventa<ReturnType<typeof electronScreen.getCursorScreenPoint>>('eventa:invoke:electron:screen:get-cursor-screen-point')
+const dipToScreenPoint = defineInvokeEventa<ReturnType<typeof electronScreen.dipToScreenPoint>, Parameters<typeof electronScreen.dipToScreenPoint>[0]>('eventa:invoke:electron:screen:dip-to-screen-point')
+const dipToScreenRect = defineInvokeEventa<ReturnType<typeof electronScreen.dipToScreenRect>, Parameters<typeof electronScreen.dipToScreenRect>[1]>('eventa:invoke:electron:screen:dip-to-screen-rect')
+const screenToDipPoint = defineInvokeEventa<ReturnType<typeof electronScreen.screenToDipPoint>, Parameters<typeof electronScreen.screenToDipPoint>[0]>('eventa:invoke:electron:screen:screen-to-dip-point')
+const screenToDipRect = defineInvokeEventa<ReturnType<typeof electronScreen.screenToDipRect>, Parameters<typeof electronScreen.screenToDipRect>[1]>('eventa:invoke:electron:screen:screen-to-dip-rect')
+
+export const screen = {
+  getAllDisplays,
+  getPrimaryDisplay,
+  getCursorScreenPoint,
+  dipToScreenPoint,
+  dipToScreenRect,
+  screenToDipPoint,
+  screenToDipRect,
+}
diff --git a/packages/electron-eventa/src/electron/system-preferences.ts b/packages/electron-eventa/src/electron/system-preferences.ts
new file mode 100644
index 000000000..8c2475bbe
--- /dev/null
+++ b/packages/electron-eventa/src/electron/system-preferences.ts
@@ -0,0 +1,14 @@
+import type { systemPreferences as electronSystemPreferences } from 'electron'
+
+import { defineInvokeEventa } from '@moeru/eventa'
+
+type MediaAccessStatusRequest = ['microphone' | 'camera' | 'screen']
+type AskForMediaAccessRequest = ['microphone' | 'camera']
+
+const getMediaAccessStatus = defineInvokeEventa<ReturnType<typeof electronSystemPreferences.getMediaAccessStatus>, MediaAccessStatusRequest>('eventa:invoke:electron:system-preferences:get-media-access-status')
+const askForMediaAccess = defineInvokeEventa<ReturnType<typeof electronSystemPreferences.askForMediaAccess>, AskForMediaAccessRequest>('eventa:invoke:electron:system-preferences:ask-for-media-access')
+
+export const systemPreferences = {
+  getMediaAccessStatus,
+  askForMediaAccess,
+}
diff --git a/packages/electron-eventa/src/electron/window.ts b/packages/electron-eventa/src/electron/window.ts
new file mode 100644
index 000000000..155b42ddf
--- /dev/null
+++ b/packages/electron-eventa/src/electron/window.ts
@@ -0,0 +1,26 @@
+import type { BrowserWindow, Rectangle } from 'electron'
+
+import { defineEventa, defineInvokeEventa } from '@moeru/eventa'
+
+export const bounds = defineEventa<Rectangle>('eventa:event:electron:window:bounds')
+export const startLoopGetBounds = defineInvokeEventa('eventa:event:electron:window:start-loop-get-bounds')
+
+const getBounds = defineInvokeEventa<ReturnType<BrowserWindow['getBounds']>>('eventa:invoke:electron:window:get-bounds')
+const setBounds = defineInvokeEventa<void, Parameters<BrowserWindow['setBounds']>>('eventa:invoke:electron:window:set-bounds')
+const setIgnoreMouseEvents = defineInvokeEventa<void, [boolean, { forward: boolean }]>('eventa:invoke:electron:window:set-ignore-mouse-events')
+const setVibrancy = defineInvokeEventa<void, Parameters<BrowserWindow['setVibrancy']>>('eventa:invoke:electron:window:set-vibrancy')
+const setBackgroundMaterial = defineInvokeEventa<void, Parameters<BrowserWindow['setBackgroundMaterial']>>('eventa:invoke:electron:window:set-background-material')
+const resize = defineInvokeEventa<void, { deltaX: number, deltaY: number, direction: ResizeDirection }>('eventa:invoke:electron:window:resize')
+
+export type VibrancyType = Parameters<BrowserWindow['setVibrancy']>[0]
+export type BackgroundMaterialType = Parameters<BrowserWindow['setBackgroundMaterial']>[0]
+export type ResizeDirection = 'n' | 's' | 'e' | 'w' | 'ne' | 'nw' | 'se' | 'sw'
+
+export const window = {
+  getBounds,
+  setBounds,
+  setIgnoreMouseEvents,
+  setVibrancy,
+  setBackgroundMaterial,
+  resize,
+}
diff --git a/packages/electron-eventa/src/index.ts b/packages/electron-eventa/src/index.ts
new file mode 100644
index 000000000..a10f48a0f
--- /dev/null
+++ b/packages/electron-eventa/src/index.ts
@@ -0,0 +1,12 @@
+export {
+  bounds,
+  cursorScreenPoint,
+  startLoopGetBounds,
+  startLoopGetCursorScreenPoint,
+} from './electron/index'
+export type {
+  BackgroundMaterialType,
+  ResizeDirection,
+  VibrancyType,
+} from './electron/index'
+export { electron } from './electron/index'
diff --git a/packages/electron-eventa/tsconfig.json b/packages/electron-eventa/tsconfig.json
new file mode 100644
index 000000000..6869a6239
--- /dev/null
+++ b/packages/electron-eventa/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "lib": [
+      "ESNext",
+      "DOM"
+    ],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true,
+    "skipLibCheck": true
+  },
+  "include": [
+    "src/**/*.ts"
+  ]
+}
diff --git a/packages/electron-eventa/tsdown.config.ts b/packages/electron-eventa/tsdown.config.ts
new file mode 100644
index 000000000..82bd636d9
--- /dev/null
+++ b/packages/electron-eventa/tsdown.config.ts
@@ -0,0 +1,11 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: [
+    './src/index.ts',
+    './src/electron/index.ts',
+    './src/electron-updater/index.ts',
+  ],
+  dts: true,
+  format: 'esm',
+})