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Owen Lin
8b7ec31ba7
Add `thread/rollback` to app-server to support IDEs undo-ing the last N turns of a thread. For context, an IDE partner will be supporting an "undo" capability where the IDE (the app-server client) will be responsible for reverting the local changes made during the last turn. To support this well, we also need a way to drop the last turn (or more generally, the last N turns) from the agent's context. This is what `thread/rollback` does. **Core idea**: A Thread rollback is represented as a persisted event message (EventMsg::ThreadRollback) in the rollout JSONL file, not by rewriting history. On resume, both the model's context (core replay) and the UI turn list (app-server v2's thread history builder) apply these markers so the pruned history is consistent across live conversations and `thread/resume`. Implementation notes: - Rollback only affects agent context and appends to the rollout file; clients are responsible for reverting files on disk. - If a thread rollback is currently in progress, subsequent `thread/rollback` calls are rejected. - Because we use `CodexConversation::submit` and codex core tracks active turns, returning an error on concurrent rollbacks is communicated via an `EventMsg::Error` with a new variant `CodexErrorInfo::ThreadRollbackFailed`. app-server watches for that and sends the BAD_REQUEST RPC response. Tests cover thread rollbacks in both core and app-server, including when `num_turns` > existing turns (which clears all turns). **Note**: this explicitly does **not** behave like `/undo` which we just removed from the CLI, which does the opposite of what `thread/rollback` does. `/undo` reverts local changes via ghost commits/snapshots and does not modify the agent's context / conversation history.
8b7ec31ba7
·
2026-01-06 21:23:48 +00:00
2,658 Commits
npm i -g @openai/codex
or brew install --cask codex
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Install globally with your preferred package manager:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Team, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.