Changelog - Kernel

For API library updates, see the Node SDK, Python SDK, and Go SDK changelogs.

December 19

Product updates

Added a new kernel mcp install command to the Kernel CLI that automatically configures the Kernel MCP server for AI development tools like Cursor, Claude, and Visual Studio Code.
Added a new Python template to the Kernel CLI for OpenAGI’s Lux computer use model, supporting both AsyncDefaultAgent and TaskerAgent with Kernel browser session management.
Improved CLI performance when looking up browsers by using a direct API call instead of fetching the full list of browsers.
Fixed bug where headless browsers started with no pages. Headless browsers now initialize with an initial page.
Fixed bug where replay start and end times were not being returned by the API.

December 12

Refreshed our Vercel template with an enhanced UI and AI agent example
Deprecated the “persistent” feature from browsers in favor of using extended timeout_seconds with Profiles; added name field to browsers for easier identification
Unified browser creation tools by porting Create Kernel App functionality into the Kernel CLI
Improved replay videos to include full video length metadata, enabling timestamp navigation and deep linking

December 5

Added option to include ephemeral and deleted browsers when listing sessions via API
Updated the maximum timeout available from 24 hours to 72 hours of no CDP activity
Updated the maximum async invocation duration from 15 minutes to 1 hour
Improved error messaging when invalid invocation IDs are provided

Stagehand v3: Added code example for using Stagehand v3 with Kernel browsers
Vercel AI SDK integration: Expanded Vercel integration documentation for the @onkernel/ai-sdk package
Live view: Added code example showing how to embed browser live views in an iFrame
CAPTCHA handling in stealth mode: Added documentation on CAPTCHA handling behavior with Cloudflare challenges