feat(assistant): include attachment source paths in gateway prompts

lib/app/app_controller_desktop_thread_actions.dart

@@ -577,6 +577,7 @@ extension AppControllerDesktopThreadActions on AppController {
           sha256: key,
           type: attachment.type.trim(),
           uploadedAtMs: uploadedAtMs,
+          sourcePath: attachment.sourcePath.trim(),
         ),
       );
     }
@@ -998,8 +999,10 @@ extension AppControllerDesktopThreadActions on AppController {
     if (visibleTaskInputAttachments.isNotEmpty) {
       buffer.writeln('- taskInputAttachments:');
       for (final attachment in visibleTaskInputAttachments) {
+        final sourcePath = attachment.sourcePath.trim();
+        final pathSuffix = sourcePath.isEmpty ? '' : ', path: $sourcePath';
         buffer.writeln(
-          '  - ${attachment.name.trim()} (${attachment.mimeType.trim()}, sha256: ${attachment.key})',
+          '  - ${attachment.name.trim()} (${attachment.mimeType.trim()}, sha256: ${attachment.key}$pathSuffix)',
         );
       }
     }

lib/features/assistant/assistant_attachment_payloads.dart

@@ -84,6 +84,7 @@ buildAssistantAttachmentPayloadsInternal(
         fileName: attachment.name,
         content: base64Encode(bytes),
         sha256: crypto.sha256.convert(bytes).toString(),
+        sourcePath: attachment.path,
       ),
     );
   }

lib/runtime/go_task_service_client.dart

@@ -300,7 +300,7 @@ class GoTaskServiceRequest {
           (item) => <String, dynamic>{
             'name': item.fileName,
             'description': item.mimeType,
-            'path': '',
+            'path': item.sourcePath.trim(),
           },
         ),
       ],
@@ -314,6 +314,8 @@ class GoTaskServiceRequest {
                 'sizeBytes': goTaskServiceBase64Size(item.content),
                 if (goTaskServiceAttachmentSha256(item).isNotEmpty)
                   'sha256': goTaskServiceAttachmentSha256(item),
+                if (item.sourcePath.trim().isNotEmpty)
+                  'sourcePath': item.sourcePath.trim(),
               },
             )
             .toList(growable: false),

lib/runtime/runtime_models_gateway_entities.dart

@@ -17,6 +17,7 @@ class GatewayChatAttachmentPayload {
     required this.fileName,
     required this.content,
     this.sha256 = '',
+    this.sourcePath = '',
   });
 
   final String type;
@@ -24,6 +25,7 @@ class GatewayChatAttachmentPayload {
   final String fileName;
   final String content;
   final String sha256;
+  final String sourcePath;
 
   Map<String, dynamic> toJson() {
     return {
@@ -32,6 +34,7 @@ class GatewayChatAttachmentPayload {
       'fileName': fileName,
       'content': content,
       if (sha256.trim().isNotEmpty) 'sha256': sha256.trim(),
+      if (sourcePath.trim().isNotEmpty) 'sourcePath': sourcePath.trim(),
     };
   }
 }
@@ -360,6 +363,7 @@ class LocalDeviceIdentity {
     );
   }
 }
+
 class CollaborationAttachment {
   const CollaborationAttachment({
     required this.name,

lib/runtime/runtime_models_runtime_payloads.dart

@@ -855,6 +855,7 @@ class TaskInputAttachmentRecord {
     required this.sha256,
     required this.type,
     required this.uploadedAtMs,
+    this.sourcePath = '',
   });
 
   final String name;
@@ -862,6 +863,7 @@ class TaskInputAttachmentRecord {
   final String sha256;
   final String type;
   final double uploadedAtMs;
+  final String sourcePath;
 
   String get key => sha256.trim().toLowerCase();
 
@@ -872,6 +874,7 @@ class TaskInputAttachmentRecord {
       'sha256': key,
       'type': type.trim(),
       'uploadedAtMs': uploadedAtMs,
+      if (sourcePath.trim().isNotEmpty) 'sourcePath': sourcePath.trim(),
     };
   }
 
@@ -889,6 +892,7 @@ class TaskInputAttachmentRecord {
       sha256: json['sha256']?.toString().trim().toLowerCase() ?? '',
       type: json['type']?.toString().trim() ?? '',
       uploadedAtMs: uploadedAtMs(json['uploadedAtMs']),
+      sourcePath: json['sourcePath']?.toString().trim() ?? '',
     );
   }
 }

test/features/assistant/assistant_attachment_payloads_test.dart

@@ -34,6 +34,7 @@ void main() {
     expect(payloads.single.fileName, 'note.txt');
     expect(payloads.single.mimeType, 'text/plain');
     expect(payloads.single.type, 'file');
+    expect(payloads.single.sourcePath, file.path);
     expect(
       base64Decode(payloads.single.content),
       utf8.encode('hello attachment'),

test/runtime/assistant_execution_target_test.dart

@@ -1591,6 +1591,7 @@ void main() {
               mimeType: 'text/plain',
               fileName: 'note.txt',
               content: base64Encode(utf8.encode('note body')),
+              sourcePath: '/Users/shenlan/Desktop/note.txt',
             ),
           ],
         );
@@ -1615,7 +1616,11 @@ void main() {
         final attachments = params['attachments'] as List<dynamic>;
         final attachment = attachments.single as Map<String, dynamic>;
         expect(attachment['name'], 'note.txt');
-        expect(attachment['path'], isEmpty);
+        expect(attachment['path'], '/Users/shenlan/Desktop/note.txt');
+        expect(
+          inlineAttachment['sourcePath'],
+          '/Users/shenlan/Desktop/note.txt',
+        );
       },
     );
 
@@ -1636,6 +1641,7 @@ void main() {
           mimeType: 'image/png',
           fileName: 'diagram.png',
           content: base64Encode(utf8.encode('image bytes')),
+          sourcePath: '/Users/shenlan/Pictures/diagram.png',
         );
 
         await controller.sendChatMessage(
@@ -1662,11 +1668,19 @@ void main() {
           fakeGoTaskService.requests.last.prompt,
           contains('diagram.png (image/png, sha256:'),
         );
+        expect(
+          fakeGoTaskService.requests.last.prompt,
+          contains('path: /Users/shenlan/Pictures/diagram.png'),
+        );
         final thread = controller.requireTaskThreadForSessionInternal(
           fakeGoTaskService.requests.last.sessionId,
         );
         expect(thread.taskInputAttachments, hasLength(1));
         expect(thread.taskInputAttachments.single.name, 'diagram.png');
+        expect(
+          thread.taskInputAttachments.single.sourcePath,
+          '/Users/shenlan/Pictures/diagram.png',
+        );
       },
     );