fix(agent-runner): stabilize event context and streams

src/langbot/pkg/provider/modelmgr/requesters/bailianchatcmpl.py

@@ -171,7 +171,8 @@ class BailianChatCompletions(modelscopechatcmpl.ModelScopeChatCompletions):
                 # 解析 chunk 数据
                 if hasattr(chunk, 'choices') and chunk.choices:
                     choice = chunk.choices[0]
-                    delta = choice.delta.model_dump() if hasattr(choice, 'delta') else {}
+                    delta_obj = getattr(choice, 'delta', None)
+                    delta = delta_obj.model_dump() if delta_obj is not None else {}
                     finish_reason = getattr(choice, 'finish_reason', None)
                 else:
                     delta = {}

src/langbot/pkg/provider/modelmgr/requesters/chatcmpl.py

@@ -359,7 +359,8 @@ class OpenAIChatCompletions(requester.ProviderAPIRequester):
 
             if hasattr(chunk, 'choices') and chunk.choices:
                 choice = chunk.choices[0]
-                delta = choice.delta.model_dump() if hasattr(choice, 'delta') else {}
+                delta_obj = getattr(choice, 'delta', None)
+                delta = delta_obj.model_dump() if delta_obj is not None else {}
 
                 finish_reason = getattr(choice, 'finish_reason', None)
             else:

src/langbot/pkg/provider/modelmgr/requesters/geminichatcmpl.py

@@ -132,7 +132,8 @@ class GeminiChatCompletions(chatcmpl.OpenAIChatCompletions):
 
             if hasattr(chunk, 'choices') and chunk.choices:
                 choice = chunk.choices[0]
-                delta = choice.delta.model_dump() if hasattr(choice, 'delta') else {}
+                delta_obj = getattr(choice, 'delta', None)
+                delta = delta_obj.model_dump() if delta_obj is not None else {}
 
                 finish_reason = getattr(choice, 'finish_reason', None)
             else:

src/langbot/pkg/provider/modelmgr/requesters/jiekouaichatcmpl.py

@@ -144,7 +144,8 @@ class JieKouAIChatCompletions(chatcmpl.OpenAIChatCompletions):
             # 解析 chunk 数据
             if hasattr(chunk, 'choices') and chunk.choices:
                 choice = chunk.choices[0]
-                delta = choice.delta.model_dump() if hasattr(choice, 'delta') else {}
+                delta_obj = getattr(choice, 'delta', None)
+                delta = delta_obj.model_dump() if delta_obj is not None else {}
                 finish_reason = getattr(choice, 'finish_reason', None)
             else:
                 delta = {}
@@ -159,7 +160,7 @@ class JieKouAIChatCompletions(chatcmpl.OpenAIChatCompletions):
             # reasoning_content = delta.get('reasoning_content', '')
 
             if remove_think:
-                if delta['content'] is not None:
+                if delta.get('content') is not None:
                     if '<think>' in delta['content'] and not thinking_started and not thinking_ended:
                         thinking_started = True
                         continue

src/langbot/pkg/provider/modelmgr/requesters/modelscopechatcmpl.py

@@ -391,7 +391,8 @@ class ModelScopeChatCompletions(requester.ProviderAPIRequester):
             # 解析 chunk 数据
             if hasattr(chunk, 'choices') and chunk.choices:
                 choice = chunk.choices[0]
-                delta = choice.delta.model_dump() if hasattr(choice, 'delta') else {}
+                delta_obj = getattr(choice, 'delta', None)
+                delta = delta_obj.model_dump() if delta_obj is not None else {}
                 finish_reason = getattr(choice, 'finish_reason', None)
             else:
                 delta = {}

src/langbot/pkg/provider/modelmgr/requesters/ppiochatcmpl.py

@@ -144,7 +144,8 @@ class PPIOChatCompletions(chatcmpl.OpenAIChatCompletions):
             # 解析 chunk 数据
             if hasattr(chunk, 'choices') and chunk.choices:
                 choice = chunk.choices[0]
-                delta = choice.delta.model_dump() if hasattr(choice, 'delta') else {}
+                delta_obj = getattr(choice, 'delta', None)
+                delta = delta_obj.model_dump() if delta_obj is not None else {}
                 finish_reason = getattr(choice, 'finish_reason', None)
             else:
                 delta = {}
@@ -159,7 +160,7 @@ class PPIOChatCompletions(chatcmpl.OpenAIChatCompletions):
             # reasoning_content = delta.get('reasoning_content', '')
 
             if remove_think:
-                if delta['content'] is not None:
+                if delta.get('content') is not None:
                     if '<think>' in delta['content'] and not thinking_started and not thinking_ended:
                         thinking_started = True
                         continue