fix: include assistant messages in codex-mini-latest conversation context

- Updated convertMessagesToInput to include both user and assistant messages
- Added role prefixes (User:/Assistant:) to maintain conversation context
- Added test for multi-turn conversations to ensure proper handling
- This fixes the issue where assistant responses were excluded in multi-turn conversations

src/api/providers/__tests__/openai-native.spec.ts

@@ -483,7 +483,7 @@ describe("OpenAiNativeHandler", () => {
 			expect(mockResponsesStream).toHaveBeenCalledWith({
 				model: "codex-mini-latest",
 				instructions: systemPrompt,
-				input: "Hello!",
+				input: "User: Hello!",
 			})
 
 			const textChunks = chunks.filter((chunk) => chunk.type === "text")
@@ -492,6 +492,35 @@ describe("OpenAiNativeHandler", () => {
 			expect(textChunks[1].text).toBe(" world")
 		})
 
+		it("should handle multi-turn conversations with assistant messages", async () => {
+			const multiTurnMessages: Anthropic.Messages.MessageParam[] = [
+				{
+					role: "user",
+					content: "What is 2+2?",
+				},
+				{
+					role: "assistant",
+					content: "2+2 equals 4.",
+				},
+				{
+					role: "user",
+					content: "What about 3+3?",
+				},
+			]
+
+			const responseStream = handler.createMessage(systemPrompt, multiTurnMessages)
+			const chunks: any[] = []
+			for await (const chunk of responseStream) {
+				chunks.push(chunk)
+			}
+
+			expect(mockResponsesStream).toHaveBeenCalledWith({
+				model: "codex-mini-latest",
+				instructions: systemPrompt,
+				input: "User: What is 2+2?\n\nAssistant: 2+2 equals 4.\n\nUser: What about 3+3?",
+			})
+		})
+
 		it("should handle non-streaming completion via v1/responses", async () => {
 			const result = await handler.completePrompt("Test prompt")
 

src/api/providers/openai-native.ts

@@ -173,15 +173,20 @@ export class OpenAiNativeHandler extends BaseProvider implements SingleCompletio
 	private convertMessagesToInput(messages: Anthropic.Messages.MessageParam[]): string {
 		return messages
 			.map((msg) => {
-				if (msg.role === "user") {
-					if (typeof msg.content === "string") {
-						return msg.content
-					} else if (Array.isArray(msg.content)) {
-						return msg.content
-							.filter((part) => part.type === "text")
-							.map((part) => part.text)
-							.join("\n")
-					}
+				let content = ""
+
+				if (typeof msg.content === "string") {
+					content = msg.content
+				} else if (Array.isArray(msg.content)) {
+					content = msg.content
+						.filter((part) => part.type === "text")
+						.map((part) => part.text)
+						.join("\n")
+				}
+
+				// Include role prefix to maintain conversation context
+				if (content) {
+					return msg.role === "user" ? `User: ${content}` : `Assistant: ${content}`
 				}
 				return ""
 			})