fix(ai): correct Gemini SDK payload property thinkingBudgetTokens to thinkingBudget

fix_genai_bug.js

@@ -0,0 +1,16 @@
+const fs = require('fs');
+
+const file1 = 'lib/ai/gemini-chat.ts';
+let code1 = fs.readFileSync(file1, 'utf8');
+
+// The correct property name for @google/genai ^1.0.0 is `thinkingBudget`.
+// `thinkingBudgetTokens` is the old deprecated name that throws the 400 error!
+code1 = code1.replace(/thinkingBudgetTokens:/g, 'thinkingBudget:');
+fs.writeFileSync(file1, code1);
+
+const file2 = 'lib/ai/gemini-client.ts';
+let code2 = fs.readFileSync(file2, 'utf8');
+code2 = code2.replace(/thinkingBudgetTokens:/g, 'thinkingBudget:');
+fs.writeFileSync(file2, code2);
+
+console.log("Fixed thinkingBudget property error for Gemini");

lib/ai/gemini-chat.ts

@@ -114,7 +114,7 @@ export async function callGeminiChat(opts: {
     }
 
     if (opts.includeThoughts) {
-        config.thinkingConfig = { thinkingBudgetTokens: 1024 };
+        config.thinkingConfig = { thinkingBudget: 1024 };
     }
 
     const fns = toGeminiFunctions(opts.tools ?? []);
@@ -174,7 +174,7 @@ export async function* streamGeminiChat(opts: {
     const config: any = {
       temperature: opts.temperature ?? 0.7,
       maxOutputTokens: 8192,
-      thinkingConfig: { thinkingBudgetTokens: 1024 },
+      thinkingConfig: { thinkingBudget: 1024 },
     };
 
     if (opts.systemPrompt) {

lib/ai/gemini-client.ts

@@ -88,7 +88,7 @@ export class GeminiLlmClient implements LlmClient {
 
     if (args.thinking_config) {
       config.thinkingConfig = {
-        thinkingBudgetTokens: 1024,
+        thinkingBudget: 1024,
       };
     }