Streaming fix -- need to test more

apps/sim/app/api/copilot/chat/route.ts

@@ -238,7 +238,6 @@ export async function POST(req: NextRequest) {
         mode,
         model: selectedModel,
         provider,
-        conversationHistory,
         contexts: agentContexts,
         fileAttachments,
         commands,
@@ -277,7 +276,7 @@ export async function POST(req: NextRequest) {
         streamId: userMessageIdToUse,
         chatId: actualChatId,
         currentChat,
-        conversationHistory,
+        isNewChat: conversationHistory.length === 0,
         message,
         titleModel: selectedModel,
         titleProvider: provider,

apps/sim/app/api/mothership/chat/route.ts

@@ -152,7 +152,6 @@ export async function POST(req: NextRequest) {
         userMessageId,
         mode: 'agent',
         model: '',
-        conversationHistory,
         contexts: agentContexts,
         fileAttachments,
         chatId: actualChatId,
@@ -169,7 +168,7 @@ export async function POST(req: NextRequest) {
       streamId: userMessageId,
       chatId: actualChatId,
       currentChat,
-      conversationHistory,
+      isNewChat: conversationHistory.length === 0,
       message,
       titleModel: 'claude-opus-4-5',
       requestId: tracker.requestId,

apps/sim/lib/copilot/chat-payload.ts

@@ -18,7 +18,6 @@ export interface BuildPayloadParams {
   mode: string
   model: string
   provider?: string
-  conversationHistory?: unknown[]
   contexts?: Array<{ type: string; content: string }>
   fileAttachments?: Array<{ id: string; key: string; size: number; [key: string]: unknown }>
   commands?: string[]
@@ -102,7 +101,6 @@ export async function buildCopilotRequestPayload(
     commands,
     chatId,
     prefetch,
-    conversationHistory,
     implicitFeedback,
   } = params
 
@@ -157,9 +155,6 @@ export async function buildCopilotRequestPayload(
     messageId: userMessageId,
     ...(contexts && contexts.length > 0 ? { context: contexts } : {}),
     ...(chatId ? { chatId } : {}),
-    ...(Array.isArray(conversationHistory) && conversationHistory.length > 0
-      ? { conversationHistory }
-      : {}),
     ...(typeof prefetch === 'boolean' ? { prefetch } : {}),
     ...(implicitFeedback ? { implicitFeedback } : {}),
     ...(processedFileContents.length > 0 ? { fileAttachments: processedFileContents } : {}),

apps/sim/lib/copilot/chat-streaming.ts

@@ -68,7 +68,7 @@ export interface StreamingOrchestrationParams {
   streamId: string
   chatId?: string
   currentChat: any
-  conversationHistory: unknown[]
+  isNewChat: boolean
   message: string
   titleModel: string
   titleProvider?: string
@@ -83,7 +83,7 @@ export function createSSEStream(params: StreamingOrchestrationParams): ReadableS
     streamId,
     chatId,
     currentChat,
-    conversationHistory,
+    isNewChat,
     message,
     titleModel,
     titleProvider,
@@ -93,6 +93,7 @@ export function createSSEStream(params: StreamingOrchestrationParams): ReadableS
 
   let eventWriter: ReturnType<typeof createStreamEventWriter> | null = null
   let clientDisconnected = false
+  const abortController = new AbortController()
 
   return new ReadableStream({
     async start(controller) {
@@ -137,7 +138,7 @@ export function createSSEStream(params: StreamingOrchestrationParams): ReadableS
         await pushEvent({ type: 'chat_id', chatId })
       }
 
-      if (chatId && !currentChat?.title && conversationHistory.length === 0) {
+      if (chatId && !currentChat?.title && isNewChat) {
         requestChatTitle({ message, model: titleModel, provider: titleProvider })
           .then(async (title) => {
             if (title) {
@@ -153,6 +154,7 @@ export function createSSEStream(params: StreamingOrchestrationParams): ReadableS
       try {
         await orchestrateCopilotStream(requestPayload, {
           ...orchestrateOptions,
+          abortSignal: abortController.signal,
           onEvent: async (event) => {
             await pushEvent(event)
           },
@@ -161,6 +163,12 @@ export function createSSEStream(params: StreamingOrchestrationParams): ReadableS
         await eventWriter.close()
         await setStreamMeta(streamId, { status: 'complete', userId })
       } catch (error) {
+        if (clientDisconnected || abortController.signal.aborted) {
+          logger.info(`[${requestId}] Stream aborted by client disconnect`)
+          await eventWriter.close().catch(() => {})
+          await setStreamMeta(streamId, { status: 'complete', userId })
+          return
+        }
         logger.error(`[${requestId}] Orchestration error:`, error)
         await eventWriter.close()
         await setStreamMeta(streamId, {
@@ -180,6 +188,7 @@ export function createSSEStream(params: StreamingOrchestrationParams): ReadableS
     },
     async cancel() {
       clientDisconnected = true
+      abortController.abort()
       if (eventWriter) {
         await eventWriter.flush()
       }