What changed

  • requires: "0.74.0" pins one release, and a binary outside it stops with AAI-005 naming its install command, such as pnpm install (#1399, #1411).
  • Environment specs write .codex/environments/environment.toml with worktree setup, cleanup, and one action button per dev command (#1393, #1411).
  • explain --inputs lists every file a hook should watch, and sync.output-manifest commits the list of generated paths so CI names a leftover with no .sync-state (#1411).

Full details are in the GitHub release notes.

Upstream CLI and model news

  • Kiro (changelog 2026-09-28): Claude Opus 5.5 is available with experimental support across the Kiro IDE, CLI, Crew, and Web for paid plans in us-east-1 and eu-central-1, at a 2.0x credit multiplier. An agent spec's model reaches Kiro agents as written. State: supported. Claude Opus 5.5 Now Available