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Codex CLI

OpenAI · CLI

Codex CLI 0.151.0-alpha.10

0.151.0-alpha.9→0.151.0-alpha.10·August 28, 2026 at 6:16 PM UTC

Patch alpha release (0.151.0-alpha.9 → 0.151.0-alpha.10) with rollout reading improvements, client message chunking, and removal of a config key and escalate-related env var.

Changelog

  • [changed] Client messaging now surfaces chunked result events instead of a single combined message result event, so large client message payloads can be handled incrementally.
  • [new] Rollout handling includes a seekable reader path for more flexible reading of stored session rollouts.
  • [new] A writerlegacy_rollout_conversion_failed notification is emitted when legacy rollout conversion does not succeed.
  • [new] Config bundle responses are modeled as a dedicated typed payload (ConfigBundleResponse).
  • [removed] The exclude_slash_tmp config key is no longer supported.
  • [removed] The CODEX_ESCALATE_SOCKETMESSAGE environment variable is no longer recognized.
  • [removed] The cloud requirements TOML bundle data model is dropped in favor of the newer config-bundle response shape.
  • [changed] Hook handler configuration distinguishes agent and prompt hook handlers more explicitly.
  • [changed] Filesystem path handling adds a glob-pattern path form in place of the previous special-path variant.
  • [changed] Realtime thread start transport no longer uses the WebRTC transport option; an existing-call transport is used instead.
  • [changed] Tool-call summary messaging prefers a wait-agent style summary over the previous terminal message form.
  • [changed] Version metadata now reports 0.151.0-alpha.10 (rust-v0.151.0-alpha.10).

Under the hood

  • Rollout I/O gains a dedicated seekable reader subsystem to support non-linear access when loading or converting rollouts.
  • Account/login and host-to-client handshake/event enums were tightened (API-key thread init, handshake-rejected yield, and related client event naming), aligning internal protocol variants with the chunked client-message path.
  • Trace and delegate tooling internals were reshaped (code-mode response traces, code-cell started events, invoke-tool delegate requests) as part of the same protocol cleanup.
  • MCP elicitation request modeling shifts away from a URL-oriented high-risk form toward a form-oriented variant.

Upgrade notes

  • Remove any remaining exclude_slash_tmp settings from config; they will no longer apply.
  • Drop CODEX_ESCALATE_SOCKETMESSAGE from environments or scripts; it is no longer read.
  • If you integrate against client message result events, switch to the chunked client message result event stream.
  • Callers that depended on the cloud requirements TOML bundle shape should move to ConfigBundleResponse.
  • Realtime start flows that assumed a WebRTC transport should use the existing-call transport instead.

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