Add option requiresBeginWithUserMessage

Author: intitni

Core/Sources/HostApp/AccountSettings/ChatModelManagement/ChatModelEdit.swift

@@ -33,6 +33,7 @@ struct ChatModelEdit {
         var openAIProjectID: String = ""
         var customHeaders: [ChatModel.Info.CustomHeaderInfo.HeaderField] = []
         var openAICompatibleSupportsMultipartMessageContent = true
+        var requiresBeginWithUserMessage = false
     }
 
     enum Action: Equatable, BindableAction {
@@ -298,7 +299,8 @@ extension ChatModel {
                 openAICompatibleInfo: .init(
                     enforceMessageOrder: state.enforceMessageOrder,
                     supportsMultipartMessageContent: state
-                        .openAICompatibleSupportsMultipartMessageContent
+                        .openAICompatibleSupportsMultipartMessageContent,
+                    requiresBeginWithUserMessage: state.requiresBeginWithUserMessage
                 ),
                 customHeaderInfo: .init(headers: state.customHeaders)
             )
@@ -325,7 +327,8 @@ extension ChatModel {
             openAIProjectID: info.openAIInfo.projectID,
             customHeaders: info.customHeaderInfo.headers,
             openAICompatibleSupportsMultipartMessageContent: info.openAICompatibleInfo
-                .supportsMultipartMessageContent
+                .supportsMultipartMessageContent,
+            requiresBeginWithUserMessage: info.openAICompatibleInfo.requiresBeginWithUserMessage
         )
     }
 }

Core/Sources/HostApp/AccountSettings/ChatModelManagement/ChatModelEditView.swift

@@ -340,6 +340,10 @@ struct ChatModelEditView: View {
                 Toggle(isOn: $store.openAICompatibleSupportsMultipartMessageContent) {
                     Text("Support multi-part message content")
                 }
+                
+                Toggle(isOn: $store.requiresBeginWithUserMessage) {
+                    Text("Requires the first message to be from the user")
+                }
 
                 Button("Custom Headers") {
                     isEditingCustomHeader.toggle()

Tool/Sources/AIModel/ChatModel.swift

@@ -53,13 +53,17 @@ public struct ChatModel: Codable, Equatable, Identifiable {
             public var enforceMessageOrder: Bool
             @FallbackDecoding<EmptyTrue>
             public var supportsMultipartMessageContent: Bool
+            @FallbackDecoding<EmptyBool>
+            public var requiresBeginWithUserMessage: Bool
 
             public init(
                 enforceMessageOrder: Bool = false,
-                supportsMultipartMessageContent: Bool = true
+                supportsMultipartMessageContent: Bool = true,
+                requiresBeginWithUserMessage: Bool = false
             ) {
                 self.enforceMessageOrder = enforceMessageOrder
                 self.supportsMultipartMessageContent = supportsMultipartMessageContent
+                self.requiresBeginWithUserMessage = requiresBeginWithUserMessage
             }
         }
 

Tool/Sources/OpenAIService/APIs/OpenAIChatCompletionsService.swift

@@ -307,6 +307,8 @@ actor OpenAIChatCompletionsService: ChatCompletionsStreamAPI, ChatCompletionsAPI
             enforceMessageOrder: model.info.openAICompatibleInfo.enforceMessageOrder,
             supportsMultipartMessageContent: model.info.openAICompatibleInfo
                 .supportsMultipartMessageContent,
+            requiresBeginWithUserMessage: model.info.openAICompatibleInfo
+                .requiresBeginWithUserMessage,
             canUseTool: model.info.supportsFunctionCalling,
             supportsImage: model.info.supportsImage,
             supportsAudio: model.info.supportsAudio
@@ -709,6 +711,7 @@ extension OpenAIChatCompletionsService.RequestBody {
         endpoint: URL,
         enforceMessageOrder: Bool,
         supportsMultipartMessageContent: Bool,
+        requiresBeginWithUserMessage: Bool,
         canUseTool: Bool,
         supportsImage: Bool,
         supportsAudio: Bool
@@ -732,10 +735,21 @@ extension OpenAIChatCompletionsService.RequestBody {
 
         model = body.model
 
+        var body = body
+
+        if requiresBeginWithUserMessage {
+            let firstUserIndex = body.messages.firstIndex(where: { $0.role == .user }) ?? 0
+            let endIndex = firstUserIndex
+            for i in stride(from: endIndex - 1, to: 0, by: -1)
+                where i >= 0 && body.messages.endIndex > i
+            {
+                body.messages.remove(at: i)
+            }
+        }
+
         // Special case for Claude through OpenRouter
 
         if endpoint.absoluteString.contains("openrouter.ai"), model.hasPrefix("anthropic/") {
-            var body = body
             body.model = model.replacingOccurrences(of: "anthropic/", with: "")
             let claudeRequestBody = ClaudeChatCompletionsService.RequestBody(body)
             messages = claudeRequestBody.system.map {