The removal of TeamCreate and TeamDelete is a breaking change for any workflow that explicitly called those tools. Update to use the Agent tool's name parameter directly. The team_name field in TeammateIdle hook event payloads is deprecated and will be removed in a future release.

The Artifact tool's content model changed: files should no longer include <!DOCTYPE html>, <html>, <head>, or <body> tags — the tool wraps the content in a skeleton automatically. Existing artifact files that include these tags may render with duplicate structure.