Use default contexts and pages rather than creating new ones

templates/python/advanced-sample/main.py

@@ -32,10 +32,8 @@ async def test_captcha_solver(ctx: kernel.KernelContext) -> None:
         browser = await playwright.chromium.connect_over_cdp(kernel_browser.cdp_ws_url)
 
         # Get or create context and page
-        contexts = browser.contexts
-        context = contexts[0] if contexts else await browser.new_context()
-        pages = context.pages
-        page = pages[0] if pages else await context.new_page()
+        context = browser.contexts[0] if browser.contexts else await browser.new_context()
+        page = context.pages[0] if context.pages else await context.new_page()
 
         # Access the live view. Retrieve this live_view_url from the Kernel logs in your CLI:
         # export KERNEL_API_KEY=<Your API key>

templates/python/computer-use/main.py

@@ -44,8 +44,8 @@ async def cu_task(
     try:
         async with async_playwright() as playwright:
             browser = await playwright.chromium.connect_over_cdp(kernel_browser.cdp_ws_url)
-            context_obj = browser.contexts[0]
-            page = context_obj.pages[0]
+            context = browser.contexts[0] if browser.contexts else await browser.new_context()
+            page = context.pages[0] if context.pages else await context.new_page()
 
             # Run the sampling loop
             final_messages = await sampling_loop(

templates/python/cua/computers/default/kernel.py

@@ -23,14 +23,7 @@ def get_dimensions(self):
     def _get_browser_and_page(self) -> tuple[Browser, Page]:
         # Connect to the remote browser using the CDP URL
         browser = self._playwright.chromium.connect_over_cdp(self.cdp_ws_url)
-        # Use the first context or create one if none exists
-        if browser.contexts:
-            context = browser.contexts[0]
-        else:
-            context = browser.new_context()
-        # Add event listeners for page creation and closure
-        context.on("page", self._handle_new_page)
-        # Create a new page and set viewport
+        context = browser.contexts[0] if browser.contexts else browser.new_context()
         page = context.pages[0] if context.pages else context.new_page()
         page.set_viewport_size({"width": self.width, "height": self.height})
         page.on("close", self._handle_page_close)

templates/python/cua/computers/default/local_playwright.py

@@ -23,12 +23,13 @@ def _get_browser_and_page(self) -> tuple[Browser, Page]:
             env={"DISPLAY": ":0"},
         )
 
-        context = browser.new_context()
+        context = browser.contexts[0] if browser.contexts else browser.new_context()
+
 
         # Add event listeners for page creation and closure
         context.on("page", self._handle_new_page)
 
-        page = context.new_page()
+        page = context.pages[0] if context.pages else context.new_page()
         page.set_viewport_size({"width": width, "height": height})
         page.on("close", self._handle_page_close)
 

templates/python/cua/pyproject.toml

@@ -20,7 +20,7 @@ dependencies = [
     "kernel>=0.6.0",
     "playwright==1.52.0",
     "pydantic==2.11.7",
-    "pydantic_core==2.35.1",
+    "pydantic_core==2.33.2",
     "pyee==13.0.0",
     "python-dotenv==1.1.0",
     "requests==2.32.4",