feat: cooperative cancellation, session persistence, background generation

frontend/src/lib/convert-llm-messages.ts

@@ -44,7 +44,6 @@ export function llmMessagesToUIMessages(messages: LLMMessage[]): UIMessage[] {
         id: nextId(),
         role: 'user',
         parts: [{ type: 'text', text: msg.content || '' }],
-        createdAt: new Date(),
       });
       continue;
     }
@@ -58,20 +57,30 @@ export function llmMessagesToUIMessages(messages: LLMMessage[]): UIMessage[] {
 
       if (msg.tool_calls) {
         for (const tc of msg.tool_calls) {
-          let args: Record<string, unknown> = {};
+          let input: Record<string, unknown> = {};
           try {
-            args = JSON.parse(tc.function.arguments);
+            input = JSON.parse(tc.function.arguments);
           } catch { /* malformed */ }
 
           const result = toolResults.get(tc.id);
-          parts.push({
-            type: 'tool-invocation',
-            toolCallId: tc.id,
-            toolName: tc.function.name,
-            args,
-            state: result ? 'result' : 'call',
-            ...(result ? { result: result.output } : {}),
-          } as UIMessage['parts'][number]);
+          if (result) {
+            parts.push({
+              type: 'dynamic-tool',
+              toolCallId: tc.id,
+              toolName: tc.function.name,
+              state: 'output-available',
+              input,
+              output: result.output,
+            });
+          } else {
+            parts.push({
+              type: 'dynamic-tool',
+              toolCallId: tc.id,
+              toolName: tc.function.name,
+              state: 'input-available',
+              input,
+            });
+          }
         }
       }
 
@@ -79,7 +88,6 @@ export function llmMessagesToUIMessages(messages: LLMMessage[]): UIMessage[] {
         id: nextId(),
         role: 'assistant',
         parts,
-        createdAt: new Date(),
       });
     }
   }