diff --git a/pkg-py/src/shinychat/_chat_normalize_chatlas.py b/pkg-py/src/shinychat/_chat_normalize_chatlas.py
index 991060f7..4f77cfc7 100644
--- a/pkg-py/src/shinychat/_chat_normalize_chatlas.py
+++ b/pkg-py/src/shinychat/_chat_normalize_chatlas.py
@@ -288,8 +288,18 @@ def tool_result_contents(x: "ContentToolResult") -> Tagifiable:
 
     tool = x.request.tool
     tool_title = None
+    icon = None
     if tool and tool.annotations:
         tool_title = tool.annotations.get("title")
+        icon = tool.annotations.get("extras", {}).get("icon")
+        icon = icon or tool.annotations.get("icon")
+
+    # Icon strings and HTML display never get escaped
+    icon = display.icon or icon
+    if icon and isinstance(icon, str):
+        icon = HTML(icon)
+    if value_type == "html" and isinstance(value, str):
+        value = HTML(value)
 
     # display (tool *result* level) takes precedence over
     # annotations (tool *definition* level)
@@ -301,7 +311,7 @@ def tool_result_contents(x: "ContentToolResult") -> Tagifiable:
         status="success" if x.error is None else "error",
         value=value,
         value_type=value_type,
-        icon=display.icon,
+        icon=icon,
         intent=intent,
         show_request=display.show_request,
         expanded=display.open,
diff --git a/pkg-py/src/shinychat/_markdown_stream.py b/pkg-py/src/shinychat/_markdown_stream.py
index a8cbdc17..4c2f778a 100644
--- a/pkg-py/src/shinychat/_markdown_stream.py
+++ b/pkg-py/src/shinychat/_markdown_stream.py
@@ -92,9 +92,9 @@ def __init__(
             async def _mock_task() -> str:
                 return ""
 
-            self._latest_stream: reactive.Value[reactive.ExtendedTask[[], str]] = (
-                reactive.Value(_mock_task)
-            )
+            self._latest_stream: reactive.Value[
+                reactive.ExtendedTask[[], str]
+            ] = reactive.Value(_mock_task)
 
     async def stream(
         self,
@@ -149,7 +149,9 @@ async def _task():
                         ui = self._session._process_ui(x)
 
                     result += ui["html"]
-                    await self._send_content_message(ui["html"], "append", ui["deps"])
+                    await self._send_content_message(
+                        ui["html"], "append", ui["deps"]
+                    )
 
             return result
 
@@ -249,7 +251,9 @@ async def _send_custom_message(
     ):
         if self._session.is_stub_session():
             return
-        await self._session.send_custom_message("shinyMarkdownStreamMessage", {**msg})
+        await self._session.send_custom_message(
+            "shinyMarkdownStreamMessage", {**msg}
+        )
 
     async def _raise_exception(self, e: BaseException):
         if self.on_error == "unhandled":
diff --git a/pkg-py/tests/playwright/tools/basic/app.py b/pkg-py/tests/playwright/tools/basic/app.py
index b8e7a433..5bcfdcdc 100644
--- a/pkg-py/tests/playwright/tools/basic/app.py
+++ b/pkg-py/tests/playwright/tools/basic/app.py
@@ -6,7 +6,6 @@
 import faicons
 from chatlas import ChatAuto, ContentToolResult
 from chatlas.types import ToolAnnotations
-from pydantic import BaseModel, Field
 from shiny import reactive
 from shiny.express import input, ui
 from shinychat.express import Chat
@@ -39,20 +38,6 @@ def list_files_impl():
     )
 
 
-class ListFileParams(BaseModel):
-    """
-    List files in the user's current directory. Always check again when asked.
-    """
-
-    path: str = Field(..., description="The path to list files from")
-
-
-class ListFileParamsWithIntent(ListFileParams):
-    intent: str = Field(
-        ..., description="The user's intent for this tool", alias="_intent"
-    )
-
-
 annotations: ToolAnnotations = {}
 if TOOL_OPTS["with_title"]:
     annotations["title"] = "List Files"
@@ -61,56 +46,60 @@ class ListFileParamsWithIntent(ListFileParams):
 if TOOL_OPTS["async"]:
     if TOOL_OPTS["with_intent"]:
 
-        async def list_files_func1(path: str, _intent: str):
+        async def list_files(path: str, _intent: str):  # pyright: ignore[reportRedeclaration]
+            """
+            List files in the user's current directory. Always check again when asked.
+
+            Parameters
+            ----------
+            path
+                The path to list files from.
+            _intent
+                Reason for the request to explain the tool call to the user.
+            """
             await asyncio.sleep(random.uniform(1, 10))
             return list_files_impl()
 
-        chat_client.register_tool(
-            list_files_func1,
-            name="list_files",
-            model=ListFileParamsWithIntent,
-            annotations=annotations,
-        )
-
     else:
 
-        async def list_files_func2(path: str):
+        async def list_files(path: str):  # pyright: ignore[reportRedeclaration]
+            """
+            List files in the user's current directory. Always check again when asked.
+            """
             await asyncio.sleep(random.uniform(1, 10))
             return list_files_impl()
 
-        chat_client.register_tool(
-            list_files_func2,
-            name="list_files",
-            model=ListFileParams,
-            annotations=annotations,
-        )
-
 else:
     if TOOL_OPTS["with_intent"]:
 
-        def list_files_func3(path: str, _intent: str):
+        def list_files(path: str, _intent: str):  # pyright: ignore[reportRedeclaration]
+            """
+            List files in the user's current directory. Always check again when asked.
+
+            Parameters
+            ----------
+            path
+                The path to list files from.
+            _intent
+                Reason for the request to explain the tool call to the user.
+            """
             time.sleep(random.uniform(1, 3))
             return list_files_impl()
 
-        chat_client.register_tool(
-            list_files_func3,
-            name="list_files",
-            model=ListFileParamsWithIntent,
-            annotations=annotations,
-        )
-
     else:
 
-        def list_files_func4(path: str):
+        def list_files(path: str):  # pyright: ignore[reportRedeclaration]
+            """
+            List files in the user's current directory. Always check again when asked.
+            """
             time.sleep(random.uniform(1, 3))
             return list_files_impl()
 
-        chat_client.register_tool(
-            list_files_func4,
-            name="list_files",
-            model=ListFileParams,
-            annotations=annotations,
-        )
+
+chat_client.register_tool(
+    list_files,
+    annotations=annotations,
+)
 
 ui.page_opts(fillable=True)