From faf481069669b0fe5e5eda1e4c7b70d52397c2bf Mon Sep 17 00:00:00 2001
From: Manmohan Sharma <manmohan659@gmail.com>
Date: Thu, 16 Apr 2026 14:49:22 -0700
Subject: [PATCH] fix(frontend): send correct body format to chat-api messages
 endpoint

Chat-api expects {content, temperature, max_tokens, top_k} but frontend
was sending {messages: [...]}. Now extracts last user message as content
when proxying to /api/conversations/:id/messages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 .../frontend/app/api/chat/stream/route.ts     | 21 +++++++++++--------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/services/frontend/app/api/chat/stream/route.ts b/services/frontend/app/api/chat/stream/route.ts
index 604eafce..7401caf7 100644
--- a/services/frontend/app/api/chat/stream/route.ts
+++ b/services/frontend/app/api/chat/stream/route.ts
@@ -17,20 +17,14 @@ function sseEvent(data: Record<string, unknown>) {
   return encoder.encode(`data: ${JSON.stringify(data)}\n\n`);
 }
 
-async function proxyUpstream(body: StreamBody, upstreamUrl: string, authHeader: string | null) {
+async function proxyUpstream(body: Record<string, unknown>, upstreamUrl: string, authHeader: string | null) {
   const headers: Record<string, string> = { 'Content-Type': 'application/json' };
   if (authHeader) headers['Authorization'] = authHeader;
 
   const upstream = await fetch(upstreamUrl, {
     method: 'POST',
     headers,
-    body: JSON.stringify({
-      messages: body.messages,
-      temperature: body.temperature ?? 0.8,
-      top_k: body.topK ?? 50,
-      max_tokens: 512,
-      model: body.model,
-    }),
+    body: JSON.stringify(body),
   });
 
   if (!upstream.ok || !upstream.body) {
@@ -94,8 +88,17 @@ export async function POST(req: NextRequest) {
       // If we have a conversationId and auth, use the persisted messages endpoint
       const convId = body.conversationId;
       if (convId && authHeader) {
+        // Chat-api expects {content, temperature, max_tokens, top_k}
+        // Extract the last user message as the content
+        const lastUserMsg = [...body.messages].reverse().find(m => m.role === 'user');
+        const chatApiBody = {
+          content: lastUserMsg?.content ?? '',
+          temperature: body.temperature,
+          max_tokens: body.maxTokens,
+          top_k: body.topK,
+        };
         return await proxyUpstream(
-          body,
+          chatApiBody as any,
           `${upstream.replace(/\/$/, '')}/api/conversations/${convId}/messages`,
           authHeader,
         );