Report requested Mothership model without legacy telemetry defaults

Author: Sg312

apps/sim/lib/mothership/chat/post.test.ts

@@ -1804,16 +1804,27 @@ describe('handleUnifiedChatPost copilot.use capability gate', () => {
 
     expect(response.status).toBe(200)
     expect(createSSEStream).toHaveBeenCalledTimes(1)
+    expect(startCopilotOtelRoot.mock.results.at(-1)?.value.setRequestShape).toHaveBeenCalledWith(
+      expect.objectContaining({ model: undefined })
+    )
   })
 
   /** A personal workspace, or any non-enterprise organization, is governed by no group. */
   it('streams the send when no permission group governs the user', async () => {
     resolvePermissionGroupConfig.mockResolvedValue(null)
 
-    const response = await handleUnifiedChatPost(chatRequest({ createNewChat: true }))
+    const response = await handleUnifiedChatPost(
+      chatRequest({
+        createNewChat: true,
+        modelSelection: { model: 'gpt-6-astra', fastMode: false },
+      })
+    )
 
     expect(response.status).toBe(200)
     expect(createSSEStream).toHaveBeenCalledTimes(1)
+    expect(startCopilotOtelRoot.mock.results.at(-1)?.value.setRequestShape).toHaveBeenCalledWith(
+      expect.objectContaining({ model: 'gpt-6-astra' })
+    )
   })
 
   /**

apps/sim/lib/mothership/chat/post.ts

@@ -1117,8 +1117,8 @@ export async function handleUnifiedChatPost(req: NextRequest) {
       activeOtelRoot.setRequestShape({
         branchKind: branch.kind,
         mode: body.mode,
-        model: branch.effectiveModel,
-        provider: body.provider,
+        /** Only the explicit selection is known here; the worker resolves the default and provider. */
+        model: body.modelSelection?.model,
         createNewChat: body.createNewChat,
         prefetch: body.prefetch,
         fileAttachmentsCount: body.fileAttachments?.length ?? 0,

apps/sim/lib/mothership/request/lifecycle/start.test.ts

@@ -534,6 +534,7 @@ describe('requestChatTitle billing protocol', () => {
 
     expect(fetchGo.mock.calls[0]?.[1]?.signal).toBe(signal)
     expect(title).toBe('Billing Protocol')
+    expect(fetchGo.mock.calls[0]?.[1]?.attributes).toBeUndefined()
     const headers = fetchGo.mock.calls[0]?.[1]?.headers as Record<string, string>
     const billingRequestId = headers['x-sim-billing-request-id']
     expect(billingRequestId).toMatch(

apps/sim/lib/mothership/request/lifecycle/start.ts

@@ -588,7 +588,6 @@ export async function requestChatTitle(params: {
     chatId,
     message,
     model,
-    provider,
     userId,
     workspaceId,
     organizationId,
@@ -646,10 +645,6 @@ export async function requestChatTitle(params: {
       otelContext,
       spanName: 'sim → go /api/generate-chat-title',
       operation: 'generate_chat_title',
-      attributes: {
-        [TraceAttr.GenAiRequestModel]: model,
-        ...(provider ? { [TraceAttr.GenAiSystem]: provider } : {}),
-      },
     })
 
     const payload = await response.json().catch(() => ({}))