Switch to 3.0 from Classic, Category-Based Hook Matching, and Steadier V3 Sessions

Kiro CLI 2.28.0 offers Classic users a path to switch to 3.0 without leaving their terminal, lets V3 Hooks match tool categories, and makes long V3 chats more reliable.

When you start an interactive Classic session on a host that can run 3.0, Kiro now offers to switch: choose Switch to 3.0 and upgrade my agent configs to save 3.0 as your default, upgrade your agent configurations, and rerun your command in 3.0. Decline, and Kiro reminds you again about once a week.

In V3 sessions, Hooks that run before or after a tool can now match by category, such as shell, read, write, or a specific MCP server or tool, instead of only by internal tool ID.