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Codex CLI Release: 0.151.0

OpenAI ChatGPT & Codex Changelog · article · Aug 29, 2026 · UTC

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 h

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