Import sesssions (#9474)

Co-authored-by: Douwe Osinga <douwe@squareup.com>

ui/desktop/src/components/sessions/SessionListView.tsx

@@ -608,9 +608,32 @@ const SessionListView: React.FC<SessionListViewProps> = React.memo(
       [intl]
     );
 
-    const handleImportClick = useCallback(() => {
+    const handleImportClick = useCallback(async () => {
+      const native = window.electron?.selectImportSessionFile;
+      if (typeof native === 'function') {
+        try {
+          const result = await native();
+          if (!result) return;
+          if (result.error) {
+            toast.error(intl.formatMessage(i18n.importFailed, { error: result.error }));
+            return;
+          }
+          await importSession({
+            body: { json: result.contents },
+            throwOnError: true,
+          });
+          toast.success(intl.formatMessage(i18n.importSuccess));
+          await loadSessions();
+        } catch (error) {
+          toast.error(
+            intl.formatMessage(i18n.importFailed, { error: errorMessage(error, 'Unknown error') })
+          );
+        }
+        return;
+      }
+      // Fallback for non-Electron contexts (tests, web build).
       fileInputRef.current?.click();
-    }, []);
+    }, [intl, loadSessions]);
 
     const handleImportNostrLink = useCallback(async () => {
       const deeplink = nostrImportLink.trim();
@@ -1081,7 +1104,7 @@ const SessionListView: React.FC<SessionListViewProps> = React.memo(
         <input
           ref={fileInputRef}
           type="file"
-          accept=".json"
+          accept=".json,.jsonl,application/json,application/x-ndjson"
           onChange={handleImportSession}
           className="hidden"
         />

ui/desktop/src/main.ts

@@ -1879,6 +1879,33 @@ ipcMain.handle('select-file-or-directory', async (_event, defaultPath?: string)
   return null;
 });
 
+// Native picker tailored for session imports: shows hidden files (so users can
+// reach `~/.claude/projects/...` or `~/.pi/agent/sessions/...`), filters for
+// .json/.jsonl, and returns the file's contents inline so the renderer doesn't
+// need a separate read step.
+ipcMain.handle('select-import-session-file', async () => {
+  const result = (await dialog.showOpenDialog({
+    title: 'Import session',
+    defaultPath: os.homedir(),
+    properties: ['openFile', 'showHiddenFiles'],
+    filters: [
+      { name: 'Session files', extensions: ['json', 'jsonl'] },
+      { name: 'All files', extensions: ['*'] },
+    ],
+  })) as unknown as OpenDialogReturnValue;
+
+  if (result.canceled || result.filePaths.length === 0) {
+    return null;
+  }
+  const filePath = result.filePaths[0];
+  try {
+    const contents = await fs.readFile(filePath, 'utf8');
+    return { filePath, contents };
+  } catch (err) {
+    return { filePath, contents: '', error: errorMessage(err) };
+  }
+});
+
 // ── Mesh-LLM lifecycle (see mesh.ts) ────────────────────────────────
 
 ipcMain.handle('check-mesh', () => mesh.check());

ui/desktop/src/preload.ts

@@ -126,6 +126,11 @@ type ElectronAPI = {
   startMesh: (args: string[]) => Promise<{ started: boolean; error?: string; pid?: number }>;
   stopMesh: () => Promise<{ stopped: boolean }>;
   selectFileOrDirectory: (defaultPath?: string) => Promise<string | null>;
+  selectImportSessionFile: () => Promise<{
+    filePath: string;
+    contents: string;
+    error?: string;
+  } | null>;
   getBinaryPath: (binaryName: string) => Promise<string>;
   readFile: (directory: string) => Promise<FileResponse>;
   writeFile: (directory: string, content: string) => Promise<boolean>;
@@ -223,6 +228,7 @@ const electronAPI: ElectronAPI = {
 
   selectFileOrDirectory: (defaultPath?: string) =>
     ipcRenderer.invoke('select-file-or-directory', defaultPath),
+  selectImportSessionFile: () => ipcRenderer.invoke('select-import-session-file'),
   getBinaryPath: (binaryName: string) => ipcRenderer.invoke('get-binary-path', binaryName),
   readFile: (filePath: string) => ipcRenderer.invoke('read-file', filePath),
   writeFile: (filePath: string, content: string) =>