adds attachment support

server/src/llm/streaming.ts

@@ -2,6 +2,7 @@ import { performance } from "node:perf_hooks";
 import { prisma } from "../db.js";
 import { anthropicClient, openaiClient, xaiClient } from "./providers.js";
 import { buildToolLogMessageData, runToolAwareOpenAIChatStream, type ToolExecutionEvent } from "./chat-tools.js";
+import { buildAnthropicConversationMessage, getAnthropicSystemPrompt } from "./message-content.js";
 import type { MultiplexRequest, Provider } from "./types.js";
 
 export type StreamEvent =
@@ -88,10 +89,8 @@ export async function* runMultiplexStream(req: MultiplexRequest): AsyncGenerator
     } else if (req.provider === "anthropic") {
       const client = anthropicClient();
 
-      const system = req.messages.find((m) => m.role === "system")?.content;
-      const msgs = req.messages
-        .filter((m) => m.role !== "system")
-        .map((m) => ({ role: m.role === "assistant" ? "assistant" : "user", content: m.content }));
+      const system = getAnthropicSystemPrompt(req.messages);
+      const msgs = req.messages.filter((message) => message.role !== "system").map((message) => buildAnthropicConversationMessage(message));
 
       const stream = await client.messages.create({
         model: req.model,