OpenAI Codex CLI rust-v0.121.0

OpenAI Codex CLI rust-v0.121.0 was released on April 15, 2026.

Summary

New Features - Added codex marketplace add and app-server support for installing plugin marketplaces from GitHub, git URLs, local directories, and direct marketplace.json URLs (17087, 17717, 17756)...

Release Notes

New Features - Added codex marketplace add and app-server support for installing plugin marketplaces from GitHub, git URLs, local directories, and direct marketplace.json URLs (17087, 17717, 17756). - Added TUI prompt history improvements, including Ctrl+R reverse search and local recall for accepted slash commands (17550, 17336). - Added TUI and app-server controls for memory mode, memory reset/deletion, and memory-extension cleanup (17632, 17626, 17913, 17937, 17844). - Expanded MCP/plugin support with MCP Apps tool calls, namespaced MCP registration, parallel-call opt-in, and sandbox-state metadata for MCP servers (17364, 17404, 17667, 17763). - Added realtime and app-server APIs for output modality, transcript completion events, raw turn item injection, and symlink-aware filesystem metadata (17701, 17703, 17719). - Added a secure devcontainer profile with bubblewrap support, plus macOS sandbox allowlists for Unix sockets (10431, 17547, 17654). Bug Fixes - Fixed macOS sandbox/proxy handling for private DNS and removed the danger-full-access denylist-only network mode (17370, 17732). - Fixed Windows cwd/session matching so resume --last and thread/list work when paths use verbatim prefixes (17414). - Fixed rate-limit/account handling for prolite plans and made unknown WHAM plan values decodable (17419). - Made Guardian timeouts distinct from policy denials, with timeout-specific guidance and visible TUI history entries (17381, 17486, 17521, 17557). - Stabilized app-server behavior by avoiding premature thread unloads, tolerating failed trust persistence on startup, and skipping broken symlinks in fs/readDirectory (17398, 17595, 17907). - Fixed MCP/tool-call edge cases including flattened deferred tool names, elicitation timeout accounting, and empty namespace descriptions (17556, 17566, 17946). Documentation - Documented the secure devcontainer profile and its bubblewrap requirements (10431, 17547). - Added TUI composer documentation for history search behavior (17550). - Updated app-server docs for new MCP, marketplace, turn injection, memory reset, filesystem metadata, external-agent migration, and websocket token-hash APIs (17364, 17717, 17703, 17913, 17719, 17855, 17871). - Documented WSL1 bubblewrap limitations and WSL2 behavior (17559). - Added memory pipeline documentation for extension cleanup (17844). Chores - Hardened supply-chain and CI inputs by pinning GitHub Actions, cargo installs, git dependencies, V8 checksums, and cargo-deny source allowlists (17471). - Added Bazel release-build verification so release-only Rust code is compiled in PR CI (17704, 17705). - Introduced the codex-thread-store crate/interface and moved local thread listing behind it (17659, 17824). - Required reviewed pnpm dependency build scripts for workspace installs (17558). - Reduced Rust maintenance surface with broader absolute-path types and removal of unused helper APIs (17407, 17792, 17146). Changelog Full Changelog: https://github.com/openai/codex/compare/rust-v0.120.0...rust-v0.121.0 - 17087 Add marketplace command @xli-oai - 17409 Fix Windows exec-server output test flake @etraut-openai - 17381 representing guardian review timeouts in protocol types @won-openai - 17399 TUI: enforce core boundary @etraut-openai - 17370 fix: unblock private DNS in macOS sandbox @viyatb-oai - 17396 update cloud requirements parse failure msg @alexsong-oai - 17364 [mcp] Support MCP Apps part 3 - Add mcp tool call support. @mzeng-openai - 17424 Stabilize marketplace add local source test @ningyi-oai - 17414 Fix thread/list cwd filtering for Windows verbatim paths @etraut-openai - 10431 feat(devcontainer): add separate secure customer profile @viyatb-oai - 17314 Pass turn id with feedback uploads @ningyi-oai - 17336 fix(tui): recall accepted slash commands locally @fcoury-oai - 17430 Handle closed TUI input stream as shutdown @etraut-openai - 17385 Add useagentidentity feature flag @adrian-openai - 17483 Update issue labeler agent labels @etraut-openai - 17493 fix @aibrahim-oai - 17419 Support prolite plan type @etraut-openai - 17416 Clear /ps after /stop @etraut-openai - 17415 Restore codex-tui resume hint on exit @etraut-openai - 17402 chore: refactor name and namespace to single type @sayan-oai - 17486 changing decision semantics after guardian timeout @won-openai - 17521 Clarify guardian timeout guidance @won-openai - 17547 [codex] Support bubblewrap in secure Docker devcontainer @viyatb-oai - 17519 Budget realtime current thread context @aibrahim-oai - 17556 [codex] Support flattened deferred MCP tool calls @fc-oai - 17558 build(pnpm): require reviewed dependency build scripts @mcgrew-oai - 17559 fix(sandboxing): reject WSL1 bubblewrap sandboxing @viyatb-oai - 17520 Mirror user text into realtime @aibrahim-oai - 17550 feat(tui): add reverse history search to composer @fcoury-oai - 17420 Remove context status-line meter @etraut-openai - 17506 Expose instruction sources (AGENTS.md) via app server @etraut-openai - 17566 fix(mcp) pause timer for elicitations @dylan-hurd-oai - 17406 Add MCP tool wall time to model output @pakrym-oai - 17294 Run exec-server fs operations through sandbox helper @starr-openai - 17605 Stabilize exec-server process tests @etraut-openai - 17221 feat: ignore keyring on 0.0.0 @jif-oai - 17216 Build remote exec env from exec-server policy @jif-oai - 17633 nit: change consolidation model @jif-oai - 17640 fix: stability exec server @jif-oai - 17643 fix: dedup compact @jif-oai - 17247 Make forked agent spawns keep parent model config @friel-openai - 17470 Fix custom tool output cleanup on stream failure @etraut-openai - 17417 Emit plan-mode prompt notifications for questionnaires @etraut-openai - 17481 Wrap status reset timestamps in narrow layouts @etraut-openai - 17601 Suppress duplicate compaction and terminal wait events @etraut-openai - 17657 Fix TUI compaction item replay @etraut-openai - 17595 Do not fail thread start when trust persistence fails @etraut-openai - 17407 Use AbsolutePathBuf in skill loading and codexhome @pakrym-oai - 17626 feat: disable memory endpoint @jif-oai - 17365 Include legacy deny paths in elevated Windows sandbox setup @iceweasel-oai - 17638 feat: Avoid reloading curated marketplaces for tool-suggest discovera… @jif-oai - 17398 app-server: Only unload threads which were unused for some time @euroelessar - 17669 only specify remote ports when the rule needs them @iceweasel-oai - 17691 Fix tui compilation @davidhao3300 - 17384 Update phase 2 memory model to gpt-5.4 @kliu128 - 17395 Remove unnecessary tests @kliu128 - 17685 Cap realtime mirrored user turns @aibrahim-oai - 17699 change realtime tool description @aibrahim-oai - 17667 Add supportsparalleltoolcalls flag to included mcps @josiah-openai - 17703 Add turn item injection API @pakrym-oai - 17671 Stabilize exec-server filesystem tests in CI @starr-openai - 17557 guardian timeout fix pr 3 - ux touch for timeouts @won-openai - 17719 [codex] Add symlink flag to fs metadata @pakrym-oai - 17146 [codex] Remove unused Rust helpers @pakrym-oai - 17471 fix: pin inputs @viyatb-oai - 17717 [codex] Refactor marketplace add into shared core flow @xli-oai - 17747 Refactor plugin loading to async @pakrym-oai - 17709 [codex] Initialize ICU data for code mode V8 @pakrym-oai - 17749 [codex] drain mailbox only at request boundaries @tibo-openai - 16640 [codex-analytics] feature plumbing and emittance @rhan-oai - 17761 Tighten realtime handoff finalization @aibrahim-oai - 17701 Add realtime output modality and transcript events @aibrahim-oai - 17777 nit: feature flag @jif-oai - 17637 feat: add context percent to status line @jif-oai - 17665 Always enable original image detail on supported models @fjord-oai - 17374 [codex-analytics] add session source to client metadata @marksteinbrick-oai - 17489 Moving updated-at timestamps to unique millisecond times @ddr-oai - 17784 feat: codex sampler @jif-oai - 17732 fix: Revert danger-full-access denylist-only mode @viyatb-oai - 17234 Redirect debug client output to a file @rasmusrygaard - 17803 Keep imagedetailoriginal as a removed feature flag @fjord-oai - 17372 app-server: prepare to run initialized rpcs concurrently @euroelessar - 17704 Refactor Bazel CI job setup @bolinfest - 17674 Route applypatch through the environment filesystem @starr-openai - 17702 Fix remote skill popup loading @starr-openai - 17830 [codex] Fix app-server initialized request analytics build @etraut-openai - 17389 [codex-analytics] enable general analytics by default @rhan-oai - 17659 thread store interface @wiltzius-openai - 17792 Spread AbsolutePathBuf @pakrym-oai - 17808 fix: apply patch bin refresh @jif-oai - 17838 Add realtime wire trace logs @aibrahim-oai - 17684 Adjust default tool search result caps @malone-oai - 17705 Add Bazel verify-release-build job @bolinfest - 17720 Make skill loading filesystem-aware @pakrym-oai - 17756 [codex] Support local marketplace sources @xli-oai - 17846 Fix for Guardian CI Tests stack overflow, applying Box to reduce stack pressure @won-openai - 17855 support plugins in external agent config migration @alexsong-oai - 17872 Disable hooks in guardian review sessions @abhinav-oai - 17868 Wrap delegated input text @guinness-oai - 17884 Fix clippy warnings in external agent config migration @canvrno-oai - 17837 Reuse remote exec-server in core tests @starr-openai - 17859 sandbox: remove dead seatbelt helper and update tests @bolinfest - 17870 fix: cleanup the contract of the general-purpose exec() function @bolinfest - 17871 fix: add websocket capability token hash support @viyatb-oai - 17763 Send sandbox state through MCP tool metadata @aaronl-openai - 17654 Support Unix socket allowlists in macOS sandbox @aaronl-openai - 17915 fix: cargo deny @jif-oai - 17913 feat: add endpoint to delete memories @jif-oai - 17844 feat: cleaning of memories extension @jif-oai - 17921 chore: exp flag @jif-oai - 17917 [codex] Fix current main CI blockers @sayan-oai - 17919 chore: do not disable memories for past rollouts on reset @jif-oai - 17924 nit: stable test @jif-oai - 17632 feat: memories menu @jif-oai - 17404 register all mcp tools with namespace @sayan-oai - 17941 nit: doc @jif-oai - 17938 feat: sanitize rollouts before phase 1 @jif-oai - 17937 feat: reset memories button @jif-oai - 17883 Remove exec-server fs sandbox request preflight @pakrym-oai - 17386 Register agent identities behind useagentidentity @adrian-openai - 17907 Fix fs/readDirectory to skip broken symlinks @willwang-openai - 17960 chore(features) codex dependencies feat @dylan-hurd-oai - 17965 fix: rename isazureresponseswirebaseurl to isazureresponsesprovider @bolinfest - 17946 Fix empty tool descriptions @shijie-oai - 17824 [codex] Add local thread store listing @wiltzius-openai - 17942 Add CLI update announcement @shijie-oai - 17866 Refactor auth providers to mutate request headers @pakrym-oai - 17902 app-server: track remote-control seq IDs per stream @euroelessar - 17957 mcp: remove codex/sandbox-state custom request support @bolinfest - 17953 fix: propagate log db @jif-oai - 17920 chore(tui) cleanup @dylan-hurd-oai - 17981 chore: tmp disable @jif-oai

View original release

Other Recent OpenAI Codex CLI Releases

• rust-v0.144.6 (July 18, 2026)
• rust-v0.144.5 (July 16, 2026)
• rust-v0.144.4 (July 14, 2026)
• rust-v0.144.3 (July 13, 2026)
• rust-v0.144.2 (July 13, 2026)

All OpenAI Codex CLI releases · All AI coding tool releases on Havoptic