Get around the initial empty response from gemini-2.5-flash. (#10508)

packages/core/src/core/client.ts

@@ -225,23 +225,37 @@ export class GeminiClient {
   async startChat(extraHistory?: Content[]): Promise<GeminiChat> {
     this.forceFullIdeContext = true;
     this.hasFailedCompressionAttempt = false;
-    const envParts = await getEnvironmentContext(this.config);
 
     const toolRegistry = this.config.getToolRegistry();
     const toolDeclarations = toolRegistry.getFunctionDeclarations();
     const tools: Tool[] = [{ functionDeclarations: toolDeclarations }];
 
+    // 1. Get the environment context parts as an array
+    const envParts = await getEnvironmentContext(this.config);
+
+    // 2. Convert the array of parts into a single string
+    const envContextString = envParts
+      .map((part) => part.text || '')
+      .join('\n\n');
+
+    // 3. Combine the dynamic context with the static handshake instruction
+    const allSetupText = `
+${envContextString}
+
+Reminder: Do not return an empty response when a tool call is required.
+
+My setup is complete. I will provide my first command in the next turn.
+    `.trim();
+
+    // 4. Create the history with a single, comprehensive user turn
     const history: Content[] = [
       {
         role: 'user',
-        parts: envParts,
-      },
-      {
-        role: 'model',
-        parts: [{ text: 'Got it. Thanks for the context!' }],
+        parts: [{ text: allSetupText }],
       },
       ...(extraHistory ?? []),
     ];
+
     try {
       const userMemory = this.config.getUserMemory();
       const systemInstruction = getCoreSystemPrompt(this.config, userMemory);

packages/core/src/core/turn.test.ts

@@ -251,7 +251,7 @@ describe('Turn', () => {
       expect(reportError).toHaveBeenCalledWith(
         error,
         'Error when talking to Gemini API',
-        [...historyContent, reqParts],
+        [...historyContent, { role: 'user', parts: reqParts }],
         'Turn.run-sendMessageStream',
       );
     });

packages/core/src/core/turn.ts

@@ -28,6 +28,7 @@ import {
 } from '../utils/errors.js';
 import type { GeminiChat } from './geminiChat.js';
 import { parseThought, type ThoughtSummary } from '../utils/thoughtUtils.js';
+import { createUserContent } from '@google/genai';
 
 // Define a structure for tools passed to the server
 export interface ServerTool {
@@ -306,7 +307,10 @@ export class Turn {
         throw error;
       }
 
-      const contextForReport = [...this.chat.getHistory(/*curated*/ true), req];
+      const contextForReport = [
+        ...this.chat.getHistory(/*curated*/ true),
+        createUserContent(req),
+      ];
       await reportError(
         error,
         'Error when talking to Gemini API',