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Codex CLI

OpenAI · CLI

Codex CLI 0.140.0-alpha.2

0.139.0→0.140.0-alpha.2·June 13, 2026 at 4:58 AM UTC

Alpha release that adds the skills crate along with supporting changes for sub-agent activity, thread handling, and environment configuration.

Changelog

  • [new] Added the skills crate and its core modules for extensions, sources, and execution providers.
  • [new] Introduced SubAgentActivityEvent and related thread item support for tracking agent activity.
  • [changed] Updated ThreadStartParams and several serde payloads to accommodate new agent invocation and capability fields.
  • [changed] Expanded sandbox policy and MCP server identity variants, including external sandbox and command/url forms.

Under the hood

  • Added exec-server/src/environment_path.rs, git-utils/src/fsmonitor.rs, rmcp-client/src/streamable_http_retry.rs, and tui/src/thread_transcript.rs for improved path handling, filesystem monitoring, HTTP retry behaviour, and transcript support.
  • Workspace now includes the new skills crate (70 crates total).
  • Refined data models and enum variants for AgentMessageInvocationArgs, SignalParams, SelectedCapabilityRoot, and related server request types.

Upgrade notes

This is an alpha release channel build; update version.json expectations and test any custom sandbox or MCP configurations before wider use.

Older release← 0.140.0-alpha.17Newer release→ 0.140.0-alpha.4
All Codex CLI releases →

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