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Codex CLI

OpenAI · CLI

Codex CLI 0.156.0-alpha.4

0.156.0-alpha.3→0.156.0-alpha.4·September 18, 2026 at 10:17 PM UTC

Alpha patch 0.156.0-alpha.4: MCP protocol version configuration, plus internal hook, login, and event-model refinements.

Changelog

  • [new] MCP protocol version can be set via the CODEX_MCP_PROTOCOL_VERSION environment variable for aligning the agent with the expected MCP protocol revision.
  • [changed] Configured hook handlers distinguish agent- vs command-style hooks more clearly.
  • [changed] Login/account parameter handling is tightened around ChatGPT Codex sign-in (API-key oriented login shapes are dropped from this path).
  • [changed] Stream error reporting includes a response-stream disconnected case in place of the previous active-turn steering error.
  • [removed] Raw marketplace manifest modeling is dropped from the data layer.

Under the hood

  • Added a compact GitHub git-ref summary type for ref metadata used in GitHub-related flows.
  • Process identity variants for Linux and macOS were corrected/normalized.
  • Trace and tool-dispatch payloads were reshaped (including rollout-ended tracing and updates to dynamic tool output / file-path related variants).
  • User input modeling adjusts image-related input relative to the prior skill-oriented shape.
  • Version metadata bumped to 0.156.0-alpha.4 (rust-v0.156.0-alpha.4) on the alpha channel.

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README.mdDocs3.3 KBCHANGELOG.mdDocs93 BAGENTS.mdDocs21.9 KBconfig.mdDocs351 Bdocs/agents_md.mdDocs126 Bdocs/authentication.mdDocs134 Bdocs/CLA.mdDocs2 KBdocs/codex-rs/bazel.mdDocs7.4 KBdocs/codex-rs/protocol_v1.mdDocs9.2 KBdocs/config.mdDocs726 Bdocs/contributing.mdDocs2.6 KBdocs/example-config.mdDocs134 BView all 31 files in content/ browser →
Older release← 0.156.0-alpha.3Newer release→ 0.156.0-alpha.5
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