Documentation 2026-04-17 00:44 UTC to 2026-04-18 18:18 UTC

155| `personality` | true | Stable | Enable personality selection controls |155| `personality` | true | Stable | Enable personality selection controls |

156| `shell_snapshot` | true | Stable | Snapshot your shell environment to speed up repeated commands |156| `shell_snapshot` | true | Stable | Snapshot your shell environment to speed up repeated commands |

157| `shell_tool` | true | Stable | Enable the default `shell` tool |157| `shell_tool` | true | Stable | Enable the default `shell` tool |

158| `smart_approvals` | false | Experimental | Route eligible approval requests through the guardian reviewer subagent |158| `guardian_approval` | false | Experimental | Route eligible approval requests through the guardian reviewer subagent (set `approvals_reviewer = "guardian_subagent"`). |

159| `unified_exec` | `true` except Windows | Stable | Use the unified PTY-backed exec tool |159| `unified_exec` | `true` except Windows | Stable | Use the unified PTY-backed exec tool |

160| `undo` | false | Stable | Enable undo via per-turn git ghost snapshots |160| `undo` | false | Stable | Enable undo via per-turn git ghost snapshots |

161| `web_search` | true | Deprecated | Legacy toggle; prefer the top-level `web_search` setting |161| `web_search` | true | Deprecated | Legacy toggle; prefer the top-level `web_search` setting |

50| `features.codex_hooks` | `boolean` | Enable lifecycle hooks loaded from `hooks.json` (under development; off by default). |50| `features.codex_hooks` | `boolean` | Enable lifecycle hooks loaded from `hooks.json` (under development; off by default). |

51| `features.enable_request_compression` | `boolean` | Compress streaming request bodies with zstd when supported (stable; on by default). |51| `features.enable_request_compression` | `boolean` | Compress streaming request bodies with zstd when supported (stable; on by default). |

52| `features.fast_mode` | `boolean` | Enable Fast mode selection and the `service_tier = "fast"` path (stable; on by default). |52| `features.fast_mode` | `boolean` | Enable Fast mode selection and the `service_tier = "fast"` path (stable; on by default). |

53| `features.guardian_approval` | `boolean` | Route eligible approval requests through the guardian reviewer subagent (experimental; off by default). Use with `approvals_reviewer = "guardian_subagent"`. |

53| `features.memories` | `boolean` | Enable [Memories](https://developers.openai.com/codex/memories) (off by default). |54| `features.memories` | `boolean` | Enable [Memories](https://developers.openai.com/codex/memories) (off by default). |

54| `features.multi_agent` | `boolean` | Enable multi-agent collaboration tools (`spawn_agent`, `send_input`, `resume_agent`, `wait_agent`, and `close_agent`) (stable; on by default). |55| `features.multi_agent` | `boolean` | Enable multi-agent collaboration tools (`spawn_agent`, `send_input`, `resume_agent`, `wait_agent`, and `close_agent`) (stable; on by default). |

55| `features.personality` | `boolean` | Enable personality selection controls (stable; on by default). |56| `features.personality` | `boolean` | Enable personality selection controls (stable; on by default). |

57| `features.shell_snapshot` | `boolean` | Snapshot shell environment to speed up repeated commands (stable; on by default). |58| `features.shell_snapshot` | `boolean` | Snapshot shell environment to speed up repeated commands (stable; on by default). |

58| `features.shell_tool` | `boolean` | Enable the default `shell` tool for running commands (stable; on by default). |59| `features.shell_tool` | `boolean` | Enable the default `shell` tool for running commands (stable; on by default). |

59| `features.skill_mcp_dependency_install` | `boolean` | Allow prompting and installing missing MCP dependencies for skills (stable; on by default). |60| `features.skill_mcp_dependency_install` | `boolean` | Allow prompting and installing missing MCP dependencies for skills (stable; on by default). |

60| `features.smart_approvals` | `boolean` | Route eligible approval requests through the guardian reviewer subagent (experimental; off by default). |

61| `features.undo` | `boolean` | Enable undo support (stable; off by default). |61| `features.undo` | `boolean` | Enable undo support (stable; off by default). |

62| `features.unified_exec` | `boolean` | Use the unified PTY-backed exec tool (stable; enabled by default except on Windows). |62| `features.unified_exec` | `boolean` | Use the unified PTY-backed exec tool (stable; enabled by default except on Windows). |

63| `features.web_search` | `boolean` | Deprecated legacy toggle; prefer the top-level `web_search` setting. |63| `features.web_search` | `boolean` | Deprecated legacy toggle; prefer the top-level `web_search` setting. |

714 714 

715Key715Key

716 716 

717`features.guardian_approval`

718 

719Type / Values

720 

721`boolean`

722 

723Details

724 

725Route eligible approval requests through the guardian reviewer subagent (experimental; off by default). Use with `approvals_reviewer = "guardian_subagent"`.

726 

727Key

728 

717`features.memories`729`features.memories`

718 730 

719Type / Values731Type / Values

798 810 

799Key811Key

800 812 

801`features.smart_approvals`

802 

803Type / Values

804 

805`boolean`

806 

807Details

808 

809Route eligible approval requests through the guardian reviewer subagent (experimental; off by default).

810 

811Key

812 

813`features.undo`813`features.undo`

814 814 

815Type / Values815Type / Values

382# multi_agent = true382# multi_agent = true

383# personality = true383# personality = true

384# fast_mode = true384# fast_mode = true

385# smart_approvals = false385# guardian_approval = false

386# enable_request_compression = true386# enable_request_compression = true

387# skill_mcp_dependency_install = true387# skill_mcp_dependency_install = true

388# prevent_idle_sleep = false388# prevent_idle_sleep = false