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- Standalone installs are more self-contained, and `codex app` now opens or installs Desktop correctly on Windows and Intel Macs (#17022, #18500). - The TUI can open `/side` conversations for quick side questions, and queued input now supports slash commands and `!` shell prompts while work is running (#18190, #18542). - Plan Mode can start implementation in a fresh context, with context-usage shown before deciding whether to carry the planning thread forward (#17499, #18573). - Plugin workflows now include tabbed browsing, inline enable/disable toggles, marketplace removal, and remote, cross-repo, or local marketplace sources (#18222, #18395, #17752, #17751, #17277, #18017, #18246). - Filesystem permissions now support deny-read glob policies, managed deny-read requirements, platform sandbox enforcement, and isolated `codex exec` runs that ignore user config or rules (#15979, #17740, #18096, #18646). - Tool discovery and image generation are now enabled by default, with higher-detail image handling and original-detail metadata support for MCP and `js_repl` image outputs (#17854, #17153, #17714, #18386). ## Bug Fixes - App-server approvals, user-input prompts, and MCP elicitations now disappear from the TUI when another client resolves them, instead of leaving stale prompts behind (#15134). - Remote-control startup now tolerates missing ChatGPT auth, and MCP startup cancellation works again through app-server sessions (#18117, #18078). - Resumed and forked app-server threads now replay token usage immediately so context/status UI starts with the restored state (#18023). - Security-sensitive flows were tightened: logout revokes managed ChatGPT tokens, project hooks and exec policies require trusted workspaces, and Windows sandbox setup avoids broad user-profile and SSH-root grants (#17825, #14718, #18443, #18493). - Sandboxed `apply_patch` writes work correctly with split filesystem policies, and file watchers now notice files created after watching begins (#18296, #18492). - Several TUI rough edges were fixed, including fatal skills-list failures, invalid resume hints, duplicate context statusline entries, `/model` menu loops, redundant memory notices, and terminal title quoting in iTerm2 (#18061, #18059, #18054, #18154, #18580, #18261). ## Documentation - Added a security-boundaries reference to `SECURITY.md` for sandboxing, approvals, and network controls (#17848, #18004). - Documented custom MCP server approval defaults and exec-server stdin behavior (#17843, #18086). - Updated app-server docs for plugin API changes, marketplace removal, resume/fork token-usage replay, and warning notifications (#17277, #17751, #18023, #18298). - Added a short guide for the responses API proxy (#18604). ## Chores - Split plugin and marketplace code into `codex-core-plugins`, moved more connector code into `connectors`, and continued breaking up the large core session/turn modules (#18070, #18158, #18200, #18206, #18244, #18249). - Refactored config loading and `AGENTS.md` discovery behind narrower filesystem and manager abstractions (#18209, #18035). - Stabilized Bazel and CI with flake fixes, native Rust test sharding, scoped repository caches, stronger Windows clippy coverage, and updated `rules_rs`/LLVM pins (#17791, #18082, #18366, #18350, #18397). - Added core CODEOWNERS and a smaller development build profile (#18362, #18612). - Removed the stale core `models.json` and updated release preparation to refresh the active model catalog (#18585). ## Changelog Full Changelog: https://github.com/openai/codex/compare/rust-v0.121.0...rust-v0.122.0 - #17958 Support remote compaction for Azure responses providers @ivanmurashko - #17848 [docs] Add security boundaries reference in SECURITY.md @evawong-oai - #17990 Auto install start-codex-exec.sh dependencies @pakrym-oai - #17892 Migrate archive/unarchive to local ThreadStore @wiltzius-openai - #17989 [codex] Restore remote exec-server filesystem tests @starr-openai - #15134 Dismiss stale app-server requests after remote resolution @ebrevdo - #18002 Re-enable it @jif-oai - #17885 feat: Support alternate marketplace manifests and local string @xl-openai - #18003 [docs] Revert extra changes from PR 17848 @evawong-oai - #17714 Support original-detail metadata on MCP image outputs @fjord-oai - #17022 Significantly improve standalone installer @efrazer-oai - #17853 [mcp] Add dummy tools for previously called but currently missing tools. @mzeng-openai - #18004 [docs] Restore SECURITY.md update from PR 17848 @evawong-oai - #17896 Clarify realtime v2 context and handoff messages @bxie-openai - #17742 removing network proxy for yolo @won-openai - #17999 [codex] Make command exec delta tests chunk tolerant @euroelessar - #18033 feat: introduce codex-pr-body skill @bolinfest - #17877 Display YOLO mode permissions if set when launching TUI @canvrno-oai - #18022 Async config loading @pakrym-oai - #17854 Update ToolSearch to be enabled by default @mzeng-openai - #17831 [codex][mcp] Add resource uri meta to tool call item. @mzeng-openai - #18070 Extract plugin loading and marketplace logic into codex-core-plugins @xl-openai - #18078 Fix MCP startup cancellation through app server @etraut-openai - #17151 [codex] Route Fed ChatGPT auth through Fed edge @jackz-oai - #18006 fix: more flake @jif-oai - #18127 fix: windows flake @jif-oai - #18137 nit: add min values for memories @jif-oai - #18135 debug: windows flake @jif-oai - #18138 chore: more pollution filtering @jif-oai - #18134 chore: unify memory drop endpoints @jif-oai - #18144 nit: get rid of an expect @jif-oai - #17791 Stabilize Bazel tests (timeout tweaks and flake fixes) @ddr-oai - #18117 fix: auth preflight @jif-oai - #18146 chore: use `justfile_directory` in just file @jif-oai - #18085 [1/8] Add MCP server environment config @aibrahim-oai - #18054 fix(tui): remove duplicate context statusline item @etraut-openai - #17287 [code mode] defer mcp tools from exec description @sayan-oai - #18057 Prefill rename prompt with current thread name @etraut-openai - #18059 Fix invalid TUI resume hints @etraut-openai - #17153 Launch image generation by default @won-openai - #18042 Make yolo skip managed-network tool enforcement @won-openai - #18154 fix: model menu pop @jif-oai - #17826 [codex] Add remote thread store implementation @wiltzius-openai - #18086 [2/8] Support piped stdin in exec process API @aibrahim-oai - #18061 Avoid fatal TUI errors on skills list failure @etraut-openai - #15979 feat(permissions): add glob deny-read policy support @viyatb-oai - #18055 Improve external agent plugin migration for configured marketplaces @alexsong-oai - #17425 Auto-upgrade configured marketplaces @xli-oai - #18035 Refactor AGENTS.md discovery into AgentsMdManager @pakrym-oai - #18158 Move more connector logic into connectors crate @pakrym-oai - #17843 Add server-level approval defaults for custom MCP servers @mzeng-openai - #18178 fix: drop lock earlier; was held across send_event().await unnecessarily @bolinfest - #18000 Make thread unsubscribe test deterministic @starr-openai - #17996 Add codex_hook_run analytics event @abhinav-oai - #18184 fix: fix clippy issue in examples/ folder @bolinfest - #18023 fix(app-server): replay token usage after resume and fork @fcoury-oai - #18172 [codex] Make realtime startup context truncation deterministic @bxie-openai - #18192 Throttle Windows Bazel test concurrency @starr-openai - #18200 [codex] Split codex op handlers @pakrym-oai - #17387 Register agent tasks behind use_agent_identity @adrian-openai - #18026 Add OTEL metrics for hook runs @abhinav-oai - #18092 [codex] Update realtime V2 VAD silence delay and 1.5 prompt @bxie-openai - #18188 Add tabbed lists, single line rendering, col width changes @canvrno-oai - #18206 [codex] Split codex turn logic @pakrym-oai - #18169 Use codex-auto-review for guardian reviews @jeffsharris - #18196 Use in-process app-server for unknown-thread MCP read test @mzeng-openai - #18116 Move marketplace add under plugin command @xli-oai - #18096 feat(sandbox): add glob deny-read platform enforcement @viyatb-oai - #17971 fix: deprecate use_legacy_landlock feature flag @viyatb-oai - #18209 Refactor config loading to use filesystem abstraction @pakrym-oai - #17862 Stream apply_patch changes @akshaynathan - #18244 Split codex session modules @pakrym-oai - #17713 feat: add opt-in provider runtime abstraction @celia-oai - #18182 feat: Handle alternate plugin manifest paths @xl-openai - #18219 Move Computer Use tool suggestion to core @leoshimo-oai - #18231 codex: split thread/read view loading @wiltzius-openai - #18126 fix(exec-policy) rules parsing @dylan-hurd-oai - #17825 [codex] Revoke ChatGPT tokens on logout @sashank-oai - #18304 Fix Windows exec policy test flake @etraut-openai - #17947 fix: reduce writable root @jif-oai - #18246 Sync local plugin imports, async remote imports, refresh caches after… @alexsong-oai - #18097 defer all tools behind feature flag @sayan-oai - #17563 Add PermissionRequest hooks support @abhinav-oai - #18338 nit: phase 2 ephemeral @jif-oai - #18267 Support Ctrl+P/Ctrl+N in resume picker @etraut-openai - #18261 fix(tui): use BEL for terminal title updates @etraut-openai - #17740 feat(config): support managed deny-read requirements @viyatb-oai - #18249 Move codex module under session @pakrym-oai - #18351 Fix config-loader tests after filesystem abstraction race @bolinfest - #18021 Guardian -> Auto-Review @won-openai - #18140 feat: config aliases @jif-oai - #17232 Make app tool hint defaults pessimistic for app policies @colby-oai - #17499 feat(tui): add clear-context plan implementation @fcoury-oai - #18352 codex: route thread/read persistence through thread store @wiltzius-openai - #18263 enable tool search over dynamic tools @sayan-oai - #18350 ci: make Windows Bazel clippy catch core test imports @bolinfest - #18362 Add core CODEOWNERS @aibrahim-oai - #18366 ci: scope Bazel repository cache by job @bolinfest - #17305 Add sorting/backwardsCursor to thread/list and new thread/turns/list api @ddr-oai - #18020 [3/6] Add pushed exec process events @aibrahim-oai - #12640 Update models.json @github-actions - #18373 Show default reasoning in /status @aibrahim-oai - #18379 Attribute automated PR Babysitter review replies @etraut-openai - #18087 [4/6] Abstract MCP stdio server launching @aibrahim-oai - #18370 perf(tui): defer startup skills refresh @fcoury-oai - #18222 /plugins: Add v2 tabbed marketplace menu @canvrno-oai - #18227 [codex] Propagate rate limit reached type @richardopenai - #18380 exec-server: preserve fs helper runtime env @starr-openai - #18381 Remove the tier constraint from connectors directory requests @xl-openai - #18211 refactor: narrow async lock guard lifetimes @bolinfest - #18017 [codex] Add cross-repo plugin sources to marketplace manifests @xli-oai - #18398 refactor: use cloneable async channels for shared receivers @bolinfest - #18296 fix: fix fs sandbox helper for apply_patch @viyatb-oai - #18397 [codex] Upgrade rules_rs and llvm to latest BCR versions @zbarsky-openai - #18082 bazel: use native rust test sharding @bolinfest - #18384 Update image resizing to fit 2048 square bounds @pakrym-oai - #17277 feat: Add remote plugin fields to plugin API @xl-openai - #18395 /plugins: Add inline enablement toggles @canvrno-oai - #14718 fix: trust-gate project hooks and exec policies @viyatb-oai - #17891 [TUI] add external config migration prompt when start TUI @alexsong-oai - #18369 Feat/auto review dev message marker @won-openai - #18298 feat: Budget skill metadata and surface trimming as a warning @xl-openai - #18449 [codex] Describe uninstalled cross-repo plugin reads @xli-oai - #18220 [codex] Add owner nudge app-server API @richardopenai - #17752 [codex] Add marketplace remove command and shared logic @xli-oai - #18382 Add max context window model metadata @aibrahim-oai - #18325 Revert "[codex] drain mailbox only at request boundaries" @jif-oai - #18386 Update image outputs to default to high detail @pakrym-oai - #18499 Fix plugin cache panic when cwd is unavailable @etraut-openai - #18212 [5/6] Wire executor-backed MCP stdio @aibrahim-oai - #18573 feat(tui): show context used in plan implementation prompt @fcoury-oai - #18500 Support `codex app` on macOS (Intel) and Windows @etraut-openai - #18542 Queue slash and shell prompts in the TUI @etraut-openai - #18524 Add fallback source for external official marketplace @alexsong-oai - #18571 Log realtime session id @aibrahim-oai - #18585 Remove unused models.json @aibrahim-oai - #18190 Add `/side` conversations @etraut-openai - #18580 Avoid redundant memory enable notice @etraut-openai - #18443 Do not grant Windows sandbox ACLs on USERPROFILE @efrazer-oai - #18493 Filter Windows sandbox roots from SSH config dependencies @efrazer-oai - #17978 Persist and prewarm agent tasks per thread @adrian-openai - #18604 Add tldr docs for responses-api-proxy @andmis - #18601 Soften Fast mode plan usage copy @pash-openai - #18596 chore(multiagent) skills instructions toggle @dylan-hurd-oai - #18599 fix(guardian) disable skills message in guardian thread @dylan-hurd-oai - #18612 Create dev-small build profile @andmis - #18440 Use thread IDs in TUI resume hints @etraut-openai - #18605 TUI: remove simple legacy_core re-exports @etraut-openai - #18625 Add `codex debug models` to show model catalog @andmis - #18221 [codex] Add workspace owner usage nudge UI @richardopenai - #17980 [codex] Use AgentAssertion downstream behind use_agent_identity @adrian-openai - #17751 [codex] Add marketplace/remove app-server RPC @xli-oai - #18644 feat: add mem 2 agent header @jif-oai - #18353 chore: morpheus to path @jif-oai - #18649 fix: main 2 @jif-oai - #17721 Stabilize marketplace/remove installedRoot test @xli-oai - #18492 fix: FS watcher when file does not exist yet @jif-oai - #18646 feat: add `--ignore-user-config` and `--ignore-rules` @jif-oai - #18652 nit: telepathy to chronicle in tests @jif-oai - #18654 fix: exec policy loading for sub-agents @jif-oai - #18651 feat: chronicle alias @jif-oai
Codex CLI (Rust Implementation)
We provide Codex CLI as a standalone executable to ensure a zero-dependency install.
Installing Codex
Today, the easiest way to install Codex is via npm:
npm i -g @openai/codex
codex
You can also install via Homebrew (brew install --cask codex) or download a platform-specific release directly from our GitHub Releases.
Documentation quickstart
- First run with Codex? Start with
docs/getting-started.md(links to the walkthrough for prompts, keyboard shortcuts, and session management). - Want deeper control? See
docs/config.mdanddocs/install.md.
What's new in the Rust CLI
The Rust implementation is now the maintained Codex CLI and serves as the default experience. It includes a number of features that the legacy TypeScript CLI never supported.
Config
Codex supports a rich set of configuration options. Note that the Rust CLI uses config.toml instead of config.json. See docs/config.md for details.
Model Context Protocol Support
MCP client
Codex CLI functions as an MCP client that allows the Codex CLI and IDE extension to connect to MCP servers on startup. See the configuration documentation for details.
MCP server (experimental)
Codex can be launched as an MCP server by running codex mcp-server. This allows other MCP clients to use Codex as a tool for another agent.
Use the @modelcontextprotocol/inspector to try it out:
npx @modelcontextprotocol/inspector codex mcp-server
Use codex mcp to add/list/get/remove MCP server launchers defined in config.toml, and codex mcp-server to run the MCP server directly.
Notifications
You can enable notifications by configuring a script that is run whenever the agent finishes a turn. The notify documentation includes a detailed example that explains how to get desktop notifications via terminal-notifier on macOS. When Codex detects that it is running under WSL 2 inside Windows Terminal (WT_SESSION is set), the TUI automatically falls back to native Windows toast notifications so approval prompts and completed turns surface even though Windows Terminal does not implement OSC 9.
codex exec to run Codex programmatically/non-interactively
To run Codex non-interactively, run codex exec PROMPT (you can also pass the prompt via stdin) and Codex will work on your task until it decides that it is done and exits. If you provide both a prompt argument and piped stdin, Codex appends stdin as a <stdin> block after the prompt so patterns like echo "my output" | codex exec "Summarize this concisely" work naturally. Output is printed to the terminal directly. You can set the RUST_LOG environment variable to see more about what's going on.
Use codex exec --ephemeral ... to run without persisting session rollout files to disk.
Experimenting with the Codex Sandbox
To test to see what happens when a command is run under the sandbox provided by Codex, we provide the following subcommands in Codex CLI:
# macOS
codex sandbox macos [--full-auto] [--log-denials] [COMMAND]...
# Linux
codex sandbox linux [--full-auto] [COMMAND]...
# Windows
codex sandbox windows [--full-auto] [COMMAND]...
# Legacy aliases
codex debug seatbelt [--full-auto] [--log-denials] [COMMAND]...
codex debug landlock [--full-auto] [COMMAND]...
Selecting a sandbox policy via --sandbox
The Rust CLI exposes a dedicated --sandbox (-s) flag that lets you pick the sandbox policy without having to reach for the generic -c/--config option:
# Run Codex with the default, read-only sandbox
codex --sandbox read-only
# Allow the agent to write within the current workspace while still blocking network access
codex --sandbox workspace-write
# Danger! Disable sandboxing entirely (only do this if you are already running in a container or other isolated env)
codex --sandbox danger-full-access
The same setting can be persisted in ~/.codex/config.toml via the top-level sandbox_mode = "MODE" key, e.g. sandbox_mode = "workspace-write".
In workspace-write, Codex also includes ~/.codex/memories in its writable roots so memory maintenance does not require an extra approval.
Code Organization
This folder is the root of a Cargo workspace. It contains quite a bit of experimental code, but here are the key crates:
core/contains the business logic for Codex. Ultimately, we hope this to be a library crate that is generally useful for building other Rust/native applications that use Codex.exec/"headless" CLI for use in automation.tui/CLI that launches a fullscreen TUI built with Ratatui.cli/CLI multitool that provides the aforementioned CLIs via subcommands.
If you want to contribute or inspect behavior in detail, start by reading the module-level README.md files under each crate and run the project workspace from the top-level codex-rs directory so shared config, features, and build scripts stay aligned.