Fix LM Studio empty messages issue in convertToOpenAiMessages

src/api/transform/__tests__/openai-format.spec.ts

@@ -128,4 +128,69 @@ describe("convertToOpenAiMessages", () => {
 		expect(toolMessage.tool_call_id).toBe("weather-123")
 		expect(toolMessage.content).toBe("Current temperature in London: 20°C")
 	})
+
+	// kilocode_change: Add tests for empty content arrays to prevent LM Studio issue
+	it("should handle user messages with empty content array", () => {
+		const anthropicMessages: Anthropic.Messages.MessageParam[] = [
+			{
+				role: "user",
+				content: [],
+			},
+		]
+
+		const openAiMessages = convertToOpenAiMessages(anthropicMessages)
+		expect(openAiMessages).toHaveLength(1)
+		expect(openAiMessages[0]).toEqual({
+			role: "user",
+			content: "",
+		})
+	})
+
+	it("should handle assistant messages with empty content array", () => {
+		const anthropicMessages: Anthropic.Messages.MessageParam[] = [
+			{
+				role: "assistant",
+				content: [],
+			},
+		]
+
+		const openAiMessages = convertToOpenAiMessages(anthropicMessages)
+		expect(openAiMessages).toHaveLength(1)
+		expect(openAiMessages[0]).toEqual({
+			role: "assistant",
+			content: "",
+		})
+	})
+
+	it("should handle mixed messages with some empty content arrays", () => {
+		const anthropicMessages: Anthropic.Messages.MessageParam[] = [
+			{
+				role: "user",
+				content: "Hello",
+			},
+			{
+				role: "assistant",
+				content: [],
+			},
+			{
+				role: "user",
+				content: [],
+			},
+		]
+
+		const openAiMessages = convertToOpenAiMessages(anthropicMessages)
+		expect(openAiMessages).toHaveLength(3)
+		expect(openAiMessages[0]).toEqual({
+			role: "user",
+			content: "Hello",
+		})
+		expect(openAiMessages[1]).toEqual({
+			role: "assistant",
+			content: "",
+		})
+		expect(openAiMessages[2]).toEqual({
+			role: "user",
+			content: "",
+		})
+	})
 })

src/api/transform/openai-format.ts

@@ -98,6 +98,12 @@ export function convertToOpenAiMessages(
 							return { type: "text", text: part.text }
 						}),
 					})
+				} else if (toolMessages.length === 0) {
+					// kilocode_change: If no non-tool messages and no tool messages, create empty user message to maintain conversation flow
+					openAiMessages.push({
+						role: "user",
+						content: "",
+					})
 				}
 			} else if (anthropicMessage.role === "assistant") {
 				const { nonToolMessages, toolMessages } = anthropicMessage.content.reduce<{
@@ -126,6 +132,9 @@ export function convertToOpenAiMessages(
 							return part.text
 						})
 						.join("\n")
+				} else if (toolMessages.length === 0) {
+					// kilocode_change: If no non-tool messages and no tool messages, provide empty content to maintain valid message format
+					content = ""
 				}
 
 				// Process tool use messages