diff --git a/packages/engine-chronocat-api/src/index.ts b/packages/engine-chronocat-api/src/index.ts
new file mode 100644
index 0000000..cade5e5
--- /dev/null
+++ b/packages/engine-chronocat-api/src/index.ts
@@ -0,0 +1,71 @@
+import type {
+  OnRichMediaDownloadComplete,
+  RedIpcArgs,
+  RedIpcDataEvent,
+  RedIpcDataRequest,
+} from '@chronocat/red'
+import type { ChronocatContext } from '@chronocat/shell'
+import type { IpcManData } from 'ipcman'
+import { ipcMan } from 'ipcman'
+import { buildAssetsGet } from './api/internal/assets/get'
+import { requestMethodMap, richMediaDownloadMap } from './globalVars'
+
+declare const __DEFINE_CHRONO_VERSION__: string
+
+export const name = 'engine-chronocat-api'
+export const version = __DEFINE_CHRONO_VERSION__
+
+export const apply = async (ctx: ChronocatContext) => {
+  const dispatcher = async (method: string, payload: unknown) => {
+    switch (method) {
+      case 'nodeIKernelMsgListener/onRichMediaDownloadComplete': {
+        const { notifyInfo } = payload as OnRichMediaDownloadComplete
+
+        const downloadId = `${notifyInfo.msgId}::${notifyInfo.msgElementId}`
+
+        if (notifyInfo.fileDownType === 1 && richMediaDownloadMap[downloadId]) {
+          richMediaDownloadMap[downloadId]!(notifyInfo.filePath)
+          delete richMediaDownloadMap[downloadId]
+        }
+        return
+      }
+    }
+  }
+
+  const handler = (data: IpcManData) => {
+    switch (data.type) {
+      case 'event': {
+        if (!data.args[1] || !Array.isArray(data.args[1])) return
+        const d = data.args[1] as [RedIpcDataEvent]
+        if (!d.length) return
+        const e = d[0]
+        if (!e || !('cmdName' in e)) return
+        void dispatcher(e.cmdName, e.payload)
+        return
+      }
+
+      case 'wrapped-request': {
+        requestMethodMap[data.id] = (data.args[1] as RedIpcDataRequest)[0]
+        return
+      }
+
+      case 'wrapped-response': {
+        const method = requestMethodMap[data.id]
+        if (!method) return
+        delete requestMethodMap[data.id]
+        void dispatcher(method, data.args[1] /* RedIpcDataResponse */)
+        return
+      }
+    }
+  }
+
+  ipcMan<RedIpcArgs>({
+    handler,
+    getId: (p) => p[0].callbackId,
+  })
+
+  const register = ctx.chronocat.api.register(name)
+  register('chronocat.internal.assets.get', buildAssetsGet(ctx))
+
+  await ctx.chronocat.whenReady()
+}