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Charley Cunningham cab607befb
Centralize context update diffing logic (#11807)
## Summary
This PR centralizes model-visible state diffing for turn context updates
into one module, while keeping existing behavior and call sites stable.

### What changed
- Added `core/src/context_updates.rs` with the consolidated diffing
logic for:
  - environment context updates
  - permissions/policy updates
  - collaboration mode updates
  - model-instruction switch updates
  - personality updates
- Added `BuildSettingsUpdateItemsParams` so required dependencies are
passed explicitly.
- Updated `Session::build_settings_update_items` in `core/src/codex.rs`
to delegate to the centralized module.
- Reused the same centralized `personality_message_for` helper from
initial-context assembly to avoid duplicated logic.
- Registered the new module in `core/src/lib.rs`.

## Why
This is a minimal, shippable step toward the model-visible-state design:
all state diff decisions for turn-context update items now live in one
place, improving reviewability and reducing drift risk without expanding
scope.

## Behavior
- Intended to be behavior-preserving.
- No protocol/schema changes.
- No call-site behavior changes beyond routing through the new
centralized logic.

## Testing
Ran targeted tests in this worktree:
- `cargo test -p codex-core
build_settings_update_items_emits_environment_item_for_network_changes`
- `cargo test -p codex-core collaboration_instructions --test all`

Both passed.

## Codex author
`codex resume 019c540f-3951-7352-a3fa-6f07b834d4ce`
2026-02-17 09:21:44 -08:00
.codex/skills/test-tui Teach codex to test itself (#11531) 2026-02-11 20:03:19 -08:00
.devcontainer chore: install an extension for TOML syntax highlighting in the devcontainer (#1650) 2025-07-22 10:58:09 -07:00
.github fix(ci) Fix shell-tool-mcp.yml (#11969) 2026-02-17 11:13:18 +00:00
.vscode Move rust analyzer target dir (#5328) 2025-10-18 17:31:46 -07:00
codex-cli Make codex-sdk depend on openai/codex (#11503) 2026-02-11 16:20:10 -08:00
codex-rs Centralize context update diffing logic (#11807) 2026-02-17 09:21:44 -08:00
docs tui: preserve remote image attachments across resume/backtrack (#10590) 2026-02-13 14:54:06 -08:00
patches [bazel] Upgrade some rulesets in preparation for enabling windows, part 2 (#11197) 2026-02-09 20:08:10 +00:00
scripts bazel: enforce MODULE.bazel.lock sync with Cargo.lock (#11790) 2026-02-14 02:11:19 +00:00
sdk/typescript Make codex-sdk depend on openai/codex (#11503) 2026-02-11 16:20:10 -08:00
shell-tool-mcp feat(shell-tool-mcp): add patched zsh build pipeline (#11668) 2026-02-13 01:34:48 +00:00
third_party Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
.bazelignore [bazel] Improve runfiles handling (#10098) 2026-01-29 00:15:44 +00:00
.bazelrc [bazel] Upgrade some rulesets in preparation for enabling windows (#11109) 2026-02-08 13:40:32 -08:00
.bazelversion [bazel] Upgrade to bazel9 (#9576) 2026-01-21 13:25:36 +00:00
.codespellignore feat(network-proxy): structured policy signaling and attempt correlation to core (#11662) 2026-02-13 09:01:11 +00:00
.codespellrc feat(network-proxy): structured policy signaling and attempt correlation to core (#11662) 2026-02-13 09:01:11 +00:00
.gitignore gitignore bazel-* (#8911) 2026-01-08 07:50:58 -08:00
.markdownlint-cli2.yaml fix(tui): document paste-burst state machine (#9020) 2026-01-13 11:48:31 -08:00
.npmrc chore: migrate to pnpm for improved monorepo management (#287) 2025-04-18 16:25:15 -07:00
.prettierignore [apply-patch] Clean up apply-patch tool definitions (#2539) 2025-08-21 20:07:41 -07:00
.prettierrc.toml Initial commit 2025-04-16 12:56:08 -04:00
AGENTS.md bazel: enforce MODULE.bazel.lock sync with Cargo.lock (#11790) 2026-02-14 02:11:19 +00:00
announcement_tip.toml nit: test an (#10892) 2026-02-06 14:41:53 +01:00
BUILD.bazel [bazel] Upgrade some rulesets in preparation for enabling windows (#11109) 2026-02-08 13:40:32 -08:00
CHANGELOG.md Documentation improvement: add missing period (#3754) 2025-10-30 13:01:33 -07:00
cliff.toml docs(changelog): update install command to @openai/codex@<version> (#2073) 2025-10-18 11:02:22 -07:00
defs.bzl bazel: fix snapshot parity for tests/*.rs rust_test targets (#11893) 2026-02-16 07:11:59 +00:00
flake.lock fix(nix): update flake for newer Rust toolchain requirements (#10302) 2026-01-31 11:34:53 -08:00
flake.nix fix(nix): use correct version from Cargo.toml in flake build (#11770) 2026-02-13 12:19:25 -08:00
justfile bazel: enforce MODULE.bazel.lock sync with Cargo.lock (#11790) 2026-02-14 02:11:19 +00:00
LICENSE Initial commit 2025-04-16 12:56:08 -04:00
MODULE.bazel build(linux-sandbox): always compile vendored bubblewrap on Linux; remove CODEX_BWRAP_ENABLE_FFI (#11498) 2026-02-11 21:30:41 -08:00
MODULE.bazel.lock bazel: enforce MODULE.bazel.lock sync with Cargo.lock (#11790) 2026-02-14 02:11:19 +00:00
NOTICE Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
package.json update the ci pnpm workflow for shell-tool-mcp to use corepack for pnpm versioning (#10115) 2026-01-28 16:30:48 -07:00
pnpm-lock.yaml chore: ensure pnpm-workspace.yaml is up-to-date (#10140) 2026-01-29 10:49:03 -08:00
pnpm-workspace.yaml chore: ensure pnpm-workspace.yaml is up-to-date (#10140) 2026-01-29 10:49:03 -08:00
rbe.bzl fix: support remote arm64 builds, as well (#9018) 2026-01-10 18:41:08 -08:00
README.md docs: mention Codex app in README intro (#11926) 2026-02-16 17:35:05 +01:00

npm i -g @openai/codex
or brew install --cask codex

Codex CLI is a coding agent from OpenAI that runs locally on your computer.

Codex CLI splash


If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run codex app or visit the Codex App page.
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
  • Linux
    • x86_64: codex-x86_64-unknown-linux-musl.tar.gz
    • arm64: codex-aarch64-unknown-linux-musl.tar.gz

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.