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## Why `codex-core` still had a `test-support` crate feature that was enabled by multiple consumers (`core_test_support`, `app_test_support`, and `codex-tui` dev-deps). That introduced a second feature-resolved shape of `codex-core`, which increases compile cost and cache fragmentation across the workspace. The same root issue previously affected `deterministic_process_ids`: we were using crate features as a test/runtime switch, and Cargo had to build extra variants of a very large crate. ## What Changed ### 1) Remove `test-support` as a crate feature - Deleted the feature declaration from `core/Cargo.toml`. - Removed `features = ["test-support"]` from: - `core/tests/common/Cargo.toml` - `app-server/tests/common/Cargo.toml` - `tui/Cargo.toml` (dev-dependency) - Removed Bazel `crate_features = ["test-support"]` from `core/BUILD.bazel`. ### 2) Keep test behavior without feature-gated crate variants - Converted test-only behavior toggles to **explicit runtime switches** backed by `AtomicBool`: - thread-manager test mode toggle - deterministic unified-exec process-id toggle - Enabled those toggles from `core_test_support` ctor so integration tests keep deterministic and test-friendly behavior. ### 3) Replace feature-gated helper APIs with always-compiled hidden helpers - APIs that were previously behind `#[cfg(feature = "test-support")]` are now available as `#[doc(hidden)]` test helpers, avoiding feature-split builds while preserving existing test call sites. ## Expected Benefits ### Concrete dependency-graph effect `cargo tree -p codex-core -e features` now shows only the default feature path for `codex-core`; there are no `test-support` or `deterministic_process_ids` feature edges remaining. ### Build-performance impact - Eliminates feature-driven duplicate `codex-core` compilation variants. - Improves cache reuse across test-support consumers that previously forced separate feature resolution. - Reduces rebuild churn when switching between targets that did and did not depend on the feature-enabled `codex-core` shape. ## Safety / behavior notes - Production behavior remains unchanged by default. - Test-only behavior is now explicit and opt-in via dedicated test toggles, with docstrings clarifying these must stay at default values in production. ## Validation - `just fmt` - `cargo test -p codex-core unified_exec::` - `cargo test -p codex-core --test all unified_exec -- --test-threads=1` - `cargo check -p app_test_support` - `cargo check -p codex-tui --tests` - `cargo check -p codex-core` - `cargo tree -p codex-core -e features`
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.