config-basic.md Codex Docs, 2026-03-18 00:36 UTC → 2026-03-18 12:23 UTC

148| Key | Default | Maturity | Description |148| Key | Default | Maturity | Description |

149| -------------------- | :-------------------: | ------------ | ---------------------------------------------------------------------------------------- |149| -------------------- | :-------------------: | ------------ | ---------------------------------------------------------------------------------------- |

150| `apps` | false | Experimental | Enable ChatGPT Apps/connectors support |150| `apps` | false | Experimental | Enable ChatGPT Apps/connectors support |

151| `apps_mcp_gateway` | false | Experimental | Route Apps MCP calls through `https://api.openai.com/v1/connectors/mcp/` instead of legacy routing |151| `fast_mode` | true | Stable | Enable Fast mode selection and the `service_tier = "fast"` path |

152| `collaboration_modes` | true | Stable | Enable collaboration modes such as plan mode |152| `multi_agent` | true | Stable | Enable subagent collaboration tools |

153| `personality` | true | Stable | Enable personality selection controls |153| `personality` | true | Stable | Enable personality selection controls |

154| `remote_models` | false | Experimental | Refresh remote model list before showing readiness |154| `shell_snapshot` | true | Stable | Snapshot your shell environment to speed up repeated commands |

155| `runtime_metrics` | false | Experimental | Show runtime metrics summaries in TUI turn separators |

156| `request_rule` | true | Stable | Enable Smart approvals (`prefix_rule` suggestions) |

157| `search_tool` | false | Experimental | Enable `search_tool_bm25` so Codex discovers Apps MCP tools via search before tool calls |

158| `shell_snapshot` | false | Beta | Snapshot your shell environment to speed up repeated commands |

159| `shell_tool` | true | Stable | Enable the default `shell` tool |155| `shell_tool` | true | Stable | Enable the default `shell` tool |

160| `use_linux_sandbox_bwrap` | false | Experimental | Use the bubblewrap-based Linux sandbox pipeline |156| `smart_approvals` | false | Experimental | Route eligible approval requests through the guardian reviewer subagent |

161| `unified_exec` | false | Beta | Use the unified PTY-backed exec tool |157| `unified_exec` | `true` except Windows | Stable | Use the unified PTY-backed exec tool |

162| `undo` | true | Stable | Enable undo via per-turn git ghost snapshots |158| `undo` | false | Stable | Enable undo via per-turn git ghost snapshots |

163| `web_search` | true | Deprecated | Legacy toggle; prefer the top-level `web_search` setting |159| `web_search` | true | Deprecated | Legacy toggle; prefer the top-level `web_search` setting |

164| `web_search_cached` | true | Deprecated | Legacy toggle that maps to `web_search = "cached"` when unset |160| `web_search_cached` | false | Deprecated | Legacy toggle that maps to `web_search = "cached"` when unset |

165| `web_search_request` | true | Deprecated | Legacy toggle that maps to `web_search = "live"` when unset |161| `web_search_request` | false | Deprecated | Legacy toggle that maps to `web_search = "live"` when unset |

166 162 

167The Maturity column uses feature maturity labels such as Experimental, Beta,163The Maturity column uses feature maturity labels such as Experimental, Beta,

168 and Stable. See [Feature Maturity](https://developers.openai.com/codex/feature-maturity) for how to164 and Stable. See [Feature Maturity](https://developers.openai.com/codex/feature-maturity) for how to