diff --git a/pydantic_ai_slim/pydantic_ai/ui/vercel_ai/_adapter.py b/pydantic_ai_slim/pydantic_ai/ui/vercel_ai/_adapter.py
index 855a9dc3a7..52b7d3d656 100644
--- a/pydantic_ai_slim/pydantic_ai/ui/vercel_ai/_adapter.py
+++ b/pydantic_ai_slim/pydantic_ai/ui/vercel_ai/_adapter.py
@@ -272,7 +272,13 @@ def load_messages(cls, messages: Sequence[UIMessage]) -> list[ModelMessage]:  #
                 user_prompt_content: str | list[UserContent] = []
                 for part in msg.parts:
                     if isinstance(part, TextUIPart):
-                        user_prompt_content.append(part.text)
+                        provider_meta = load_provider_metadata(part.provider_metadata)
+                        if 'metadata' in provider_meta:
+                            user_prompt_content.append(
+                                TextContent(content=part.text, metadata=provider_meta['metadata'])
+                            )
+                        else:
+                            user_prompt_content.append(part.text)
                     elif isinstance(part, FileUIPart):
                         try:
                             file = BinaryContent.from_data_uri(part.url)
@@ -884,7 +890,13 @@ def _convert_user_prompt_part(part: UserPromptPart) -> list[UIMessagePart]:
             if isinstance(item, str):
                 ui_parts.append(TextUIPart(text=item, state='done'))
             elif isinstance(item, TextContent):
-                ui_parts.append(TextUIPart(text=item.content, state='done'))
+                ui_parts.append(
+                    TextUIPart(
+                        text=item.content,
+                        state='done',
+                        provider_metadata=dump_provider_metadata(metadata=item.metadata),
+                    )
+                )
             elif isinstance(item, BinaryContent):
                 ui_parts.append(FileUIPart(url=item.data_uri, media_type=item.media_type))
             elif isinstance(item, ImageUrl | AudioUrl | VideoUrl | DocumentUrl):
diff --git a/tests/test_vercel_ai.py b/tests/test_vercel_ai.py
index f51e429363..03f29767fe 100644
--- a/tests/test_vercel_ai.py
+++ b/tests/test_vercel_ai.py
@@ -5792,7 +5792,48 @@ async def test_convert_user_prompt_part_text_content():
     part = UserPromptPart(content=['Just some text', TextContent(content='More text', metadata={'key': 'value'})])
     ui_parts = _convert_user_prompt_part(part)
     assert ui_parts == snapshot(
-        [TextUIPart(text='Just some text', state='done'), TextUIPart(text='More text', state='done')]
+        [
+            TextUIPart(text='Just some text', state='done'),
+            TextUIPart(
+                text='More text',
+                state='done',
+                provider_metadata={'pydantic_ai': {'metadata': {'key': 'value'}}},
+            ),
+        ]
+    )
+
+
+async def test_adapter_text_content_metadata_roundtrip():
+    original_messages = [
+        ModelRequest(
+            parts=[
+                UserPromptPart(
+                    content=[
+                        'Just some text',
+                        TextContent(content='More text', metadata={'key': 'value'}),
+                    ]
+                )
+            ]
+        )
+    ]
+
+    ui_messages = VercelAIAdapter.dump_messages(original_messages)
+    reloaded_messages = VercelAIAdapter.load_messages(ui_messages)
+
+    assert reloaded_messages == snapshot(
+        [
+            ModelRequest(
+                parts=[
+                    UserPromptPart(
+                        content=[
+                            'Just some text',
+                            TextContent(content='More text', metadata={'key': 'value'}),
+                        ],
+                        timestamp=IsDatetime(),
+                    )
+                ]
+            )
+        ]
     )