diff --git a/packages/cli/src/ui/hooks/useGeminiStream.ts b/packages/cli/src/ui/hooks/useGeminiStream.ts
index 45344c73..c6c45724 100644
--- a/packages/cli/src/ui/hooks/useGeminiStream.ts
+++ b/packages/cli/src/ui/hooks/useGeminiStream.ts
@@ -559,6 +559,14 @@ export const useGeminiStream = (
       let geminiMessageBuffer = '';
       const toolCallRequests: ToolCallRequestInfo[] = [];
       for await (const event of stream) {
+        // HACK: Write every event to a file in /tmp/.
+        const timestamp = new Date()
+           .toISOString()
+           .replace(/:/g, '-')
+           .replace(/\./g, '_');
+        const fileName = `regex.gemini-api-response.${timestamp}.json`;
+        const filePath = path.join('/tmp', fileName);
+        await fs.writeFile(filePath, JSON.stringify(event, null, 2));
         switch (event.type) {
           case ServerGeminiEventType.Thought:
             setThought(event.value);