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## Why The model-visible `<network>` context currently repeats indentation and a pair of XML tags for every allowed or denied domain. Large domain sets spend a surprising amount of prompt budget on that scaffolding instead of the actual policy values. ## What changed - Render allowed domains as one comma-separated `<allowed>` value instead of one element per domain. - Render denied domains the same way. - Keep the full allow/deny domain sets model-visible while updating the serialization and settings-update coverage for the denser shape. ## Example Before: ```xml <network enabled="true"> <allowed>api.example.test</allowed> <allowed>cdn.example.test</allowed> <denied>blocked.example.test</denied> </network> ``` After: ```xml <network enabled="true"><allowed>api.example.test,cdn.example.test</allowed><denied>blocked.example.test</denied></network> ``` ## Validation - `cargo test -p codex-core environment_context` - `cargo test -p codex-core build_settings_update_items_emits_environment_item_for_network_changes` - Ran a local `codex` session with a real network context containing 121 allowed domains and 42 denied domains, then inspected the raw prompt with `raw_token_viewer_cli.py`. With the same domain set, the rendered `<network>` section shrank from 7,175 characters across 161 lines to 3,666 characters on one line, and the containing environment-context block fell from 6,428 tokens to 5,379 tokens.
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 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
- 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, Business, 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.