Codex CLI 0.151.0-alpha.5 changelog - what changed

[removed] Dropped the o1 model identifier from the built-in model list.
[changed] Collaboration session lifecycle no longer emits the collab_waiting_end event.
[changed] Hook configuration paths favor MCP tool hooks over command-style hooks.
[changed] Client/protocol result acknowledgements and related host↔client messages were tightened (including handshake reject reasons and delegate/tool-trace payloads).
[changed] Login account parameter shapes were simplified around ChatGPT-linked Codex sign-in.
[changed] Filesystem path handling in exec/tooling distinguishes glob patterns and project-roots usage more explicitly.
[removed] Removed support for the escalate-socket message environment override used in earlier builds.
[new] Added optional feedback-related config surface and a cloud requirements TOML bundle for upcoming cloud-task flows.

Under the hood

Environment and home/cloud-task internal flags were adjusted for cloud tasks and home-path handling.
Trace/marketplace manifest and patch-change payload variants were reshaped for clearer protocol observation and plugin source forms.
Typed config-bundle response payloads and persistent-mode snapshot support were added to the data model ahead of further runtime work.
Minor event and tool-call summary naming cleanups (including agent-message summaries) to match the updated client protocol.

Under the hood

Environment and home/cloud-task internal flags were adjusted for cloud tasks and home-path handling.

Trace/marketplace manifest and patch-change payload variants were reshaped for clearer protocol observation and plugin source forms.

Typed config-bundle response payloads and persistent-mode snapshot support were added to the data model ahead of further runtime work.

Minor event and tool-call summary naming cleanups (including agent-message summaries) to match the updated client protocol.