fix(pkg-py): fix message_content()'s handling of chatlas Turn (#133)

* fix(pkg-py): fix message_content()'s handling of chatlas Turns

* Update changelog

Author: cpsievert

pkg-py/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [UNRELEASED]
+
+### Bug fixes
+
+* `message_content()` and `message_content_chunk()` correctly extract content from a `chatlas.Turn`. (#133)
+
 ## [0.2.2] - 2025-09-10
 
 ### Improvements

pkg-py/src/shinychat/_chat_normalize.py

@@ -3,7 +3,7 @@
 import sys
 from functools import singledispatch
 
-from htmltools import HTML, Tagifiable, TagList
+from htmltools import HTML, Tagifiable
 
 from ._chat_normalize_chatlas import tool_request_contents, tool_result_contents
 from ._chat_types import ChatMessage
@@ -163,10 +163,15 @@ def _(chunk: ContentToolResult):
 
     @message_content.register
     def _(message: Turn):
-        contents = TagList()
+        from chatlas import ContentToolResult
+        content = ""
         for x in message.contents:
-            contents.append(message_content(x).content)
-        return ChatMessage(content=contents)
+            content += message_content(x).content
+        if all(isinstance(x, ContentToolResult) for x in message.contents):
+            role = "assistant"
+        else:
+            role = message.role
+        return ChatMessage(content=content, role=role)
 
     @message_content_chunk.register
     def _(chunk: Turn):