Merge branch 'main' into pr-939

nanobot/agent/context.py

@@ -231,7 +231,7 @@ To recall past events, grep {workspace_path}/memory/HISTORY.md"""
             msg["tool_calls"] = tool_calls
 
         # Include reasoning content when provided (required by some thinking models)
-        if reasoning_content:
+        if reasoning_content is not None:
             msg["reasoning_content"] = reasoning_content
 
         messages.append(msg)

nanobot/providers/registry.py

@@ -147,7 +147,7 @@ PROVIDERS: tuple[ProviderSpec, ...] = (
         keywords=("volcengine", "volces", "ark"),
         env_key="OPENAI_API_KEY",
         display_name="VolcEngine",
-        litellm_prefix="openai",
+        litellm_prefix="volcengine",
         skip_prefixes=(),
         env_extras=(),
         is_gateway=True,