OpenAI Codex CLI rust-v0.151.0

OpenAI Codex CLI rust-v0.151.0 was released on .

Summary

OpenAI Codex CLI rust-v0.151.0 now lets extensions inspect and modify tool results before they reach the model, giving you more control over AI responses. We've also fixed critical issues with permission profiles, model switching, and sandbox enforcement to ensure consistent, ...

Release Context

  • This was the 82nd OpenAI Codex CLI release of 2026 tracked by Havoptic.
  • It shipped 2 days after OpenAI Codex CLI rust-v0.150.1 (August 27, 2026).
  • OpenAI Codex CLI: ships every 4.4 days — 7 releases in the last month.

Why it matters: Extensions now control MCP tool results before model.

Shipped around the same time

Within 3 days of this release, other AI coding tools also shipped:

Compare OpenAI Codex CLI: vs Claude Code · vs Cursor · vs Gemini CLI · vs Kiro CLI · vs GitHub Copilot CLI · vs Devin Desktop · vs Antigravity CLI · vs Grok Build

Release Notes

New Features - Added a configurable grace period for discovering tools from optional MCP servers. (41199) - Extensions can now inspect or replace MCP tool results before they reach the model. (41202) - Plugin catalogs now combine per-repository configuration and report invalid project marketplaces without hiding valid plugins. (41208) Bug Fixes - Preserved restored permission profiles across TUI turns and prevented /cd from weakening sandbox restrictions. (41192) - Kept tool availability and reasoning effort correct when switching models or falling back to another model. (41195, 41206) - Improved remote sandbox enforcement using the executor’s actual home directory, operating system, and path conventions. (41196, 41204, 41207, 41209) - Preserved structured MCP tool and resource errors in app-server responses. (41196) - Counted nested subagent token usage toward root goal budgets. (41183) - Prevented stale Guardian classifications from authorizing actions after permission state changes. (41196) Chores - Added telemetry for escalated stdin reviews and remote executor MCP discovery. (41189, 41205) - Stabilized Guardian WebSocket and core fixture tests under slow or highly concurrent CI. (41191, 41194) Changelog Full Changelog: https://github.com/openai/codex/compare/rust-v0.150.0...rust-v0.151.0 - 41183 Account subagent token usage toward root goals @copyberry - 41189 Instrument stdin review size checks @copyberry - 41191 Stabilize Guardian WebSocket tests @copyberry - 41192 Preserve restored permission profiles in TUI sessions @copyberry - 41193 Report affected capabilities from remote plugin syncs @copyberry - 41194 Harden core test fixture startup assertions @copyberry - 41195 Finalize model-specific tool plans in ToolRouter @copyberry - 41196 Improve sandboxing, MCP errors, and cached approvals @copyberry - 41199 Make the optional MCP startup grace configurable @copyberry - 41202 Let extensions process MCP tool results @copyberry - 41204 Propagate executor home directories into sandbox contexts @copyberry - 41205 Track executor MCP discovery telemetry @copyberry - 41206 Make Ultra reasoning fallback model-aware @copyberry - 41207 Propagate executor OS into turn environments @copyberry - 41208 Honor per-repository plugin configuration in catalog requests @copyberry - 41209 Align deny-read matching with executor path semantics @copyberry

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