Updates schema, UX and prompt for IDE context (#5046)

packages/vscode-ide-companion/src/ide-server.ts

@@ -20,16 +20,17 @@ const MCP_SESSION_ID_HEADER = 'mcp-session-id';
 const IDE_SERVER_PORT_ENV_VAR = 'GEMINI_CLI_IDE_SERVER_PORT';
 const MAX_SELECTED_TEXT_LENGTH = 16384; // 16 KiB limit
 
-function sendOpenFilesChangedNotification(
+function sendIdeContextUpdateNotification(
   transport: StreamableHTTPServerTransport,
   log: (message: string) => void,
   recentFilesManager: RecentFilesManager,
 ) {
   const editor = vscode.window.activeTextEditor;
-  const filePath =
+  const activeFile =
     editor && editor.document.uri.scheme === 'file'
       ? editor.document.uri.fsPath
-      : '';
+      : undefined;
+
   const selection = editor?.selection;
   const cursor = selection
     ? {
@@ -38,25 +39,37 @@ function sendOpenFilesChangedNotification(
         character: selection.active.character,
       }
     : undefined;
+
   let selectedText = editor?.document.getText(selection) ?? undefined;
   if (selectedText && selectedText.length > MAX_SELECTED_TEXT_LENGTH) {
     selectedText =
       selectedText.substring(0, MAX_SELECTED_TEXT_LENGTH) + '... [TRUNCATED]';
   }
+
+  const openFiles = recentFilesManager.recentFiles.map((file) => {
+    const isActive = file.filePath === activeFile;
+    return {
+      path: file.filePath,
+      timestamp: file.timestamp,
+      isActive,
+      ...(isActive && {
+        cursor,
+        selectedText,
+      }),
+    };
+  });
+
   const notification: JSONRPCNotification = {
     jsonrpc: '2.0',
-    method: 'ide/openFilesChanged',
+    method: 'ide/contextUpdate',
     params: {
-      activeFile: filePath,
-      recentOpenFiles: recentFilesManager.recentFiles.filter(
-        (file) => file.filePath !== filePath,
-      ),
-      cursor,
-      selectedText,
+      workspaceState: {
+        openFiles,
+      },
     },
   };
   log(
-    `Sending active file changed notification: ${JSON.stringify(
+    `Sending IDE context update notification: ${JSON.stringify(
       notification,
       null,
       2,
@@ -87,7 +100,7 @@ export class IDEServer {
     const recentFilesManager = new RecentFilesManager(context);
     const onDidChangeSubscription = recentFilesManager.onDidChange(() => {
       for (const transport of Object.values(transports)) {
-        sendOpenFilesChangedNotification(
+        sendIdeContextUpdateNotification(
           transport,
           this.log.bind(this),
           recentFilesManager,
@@ -191,7 +204,7 @@ export class IDEServer {
       }
 
       if (!sessionsWithInitialNotification.has(sessionId)) {
-        sendOpenFilesChangedNotification(
+        sendIdeContextUpdateNotification(
           transport,
           this.log.bind(this),
           recentFilesManager,