Felipe Coury
5591912f0b
Fixes multiple scrollback and terminal resize issues: #5538, #5576, #8352, #12223, #16165, and #15380. ## Why Codex writes finalized transcript output into terminal scrollback after wrapping it for the current viewport width. A later terminal resize could leave that scrollback shaped for the old width, so wider windows kept narrow output and narrower windows could show stale wrapping artifacts until enough new output replaced the visible area. This is also the foundation PR for responsive markdown tables. Table rendering needs finalized transcript content to be width-sensitive after insertion, not only while content is first streaming. Markdown table rendering itself stays in #18576. ## Stack - PR1: resize backlog reflow and interrupt cleanup - #18576: markdown table support ## What Changed - Rebuild source-backed transcript history when the terminal width changes. `terminal_resize_reflow` is introduced through the experimental feature system, but is enabled by default for this rollout so we can validate behavior across real terminals. - Preserve assistant and plan stream source so finalized streaming output can participate in resize reflow after consolidation. - Debounce resize work, but force a final source-backed reflow when a resize happened during active or unconsolidated streaming output. - Clear stale pending history lines on resize so old-width wrapped output is not emitted just before rebuilt scrollback. - Bound replay work with `[tui.terminal_resize_reflow].max_rows`: omitted uses terminal-specific defaults, `0` keeps all rendered rows, and a positive value sets an explicit cap. The cap applies both while initially replaying a resumed transcript into scrollback and when rebuilding scrollback after terminal resize. - Consolidate interrupted assistant streams before cleanup, then clear pending stream output and active-tail state consistently. - Move resize reflow and thread event buffering helpers out of `app.rs` into dedicated TUI modules. - Add focused coverage for resize reflow, feature-gated behavior, streaming source preservation, interrupted output cleanup, unicode-neutral text, terminal-specific row caps, and composer/layout stability. ## Runtime Bounds Resize reflow keeps only the most recent rendered rows when a row cap is active. The default is `auto`, which maps to the detected terminal's default scrollback size where Codex can identify it: VS Code `1000`, Windows Terminal `9001`, WezTerm `3500`, and Alacritty `10000`. Terminals without a dedicated mapping use the conservative fallback of `1000` rows. Users can override this with `[tui.terminal_resize_reflow] max_rows = N`, or set `max_rows = 0` to disable row limiting. ## Validation - `just fmt` - `git diff --check` - `cargo test --manifest-path codex-rs/Cargo.toml -p codex-tui reflow` - `cargo test --manifest-path codex-rs/Cargo.toml -p codex-tui transcript_reflow` - `just fix -p codex-tui` - PR CI in progress on the squashed branch
Codex CLI (Rust Implementation)
We provide Codex CLI as a standalone executable to ensure a zero-dependency install.
Installing Codex
Today, the easiest way to install Codex is via npm:
npm i -g @openai/codex
codex
You can also install via Homebrew (brew install --cask codex) or download a platform-specific release directly from our GitHub Releases.
Documentation quickstart
- First run with Codex? Start with
docs/getting-started.md(links to the walkthrough for prompts, keyboard shortcuts, and session management). - Want deeper control? See
docs/config.mdanddocs/install.md.
What's new in the Rust CLI
The Rust implementation is now the maintained Codex CLI and serves as the default experience. It includes a number of features that the legacy TypeScript CLI never supported.
Config
Codex supports a rich set of configuration options. Note that the Rust CLI uses config.toml instead of config.json. See docs/config.md for details.
Model Context Protocol Support
MCP client
Codex CLI functions as an MCP client that allows the Codex CLI and IDE extension to connect to MCP servers on startup. See the configuration documentation for details.
MCP server (experimental)
Codex can be launched as an MCP server by running codex mcp-server. This allows other MCP clients to use Codex as a tool for another agent.
Use the @modelcontextprotocol/inspector to try it out:
npx @modelcontextprotocol/inspector codex mcp-server
Use codex mcp to add/list/get/remove MCP server launchers defined in config.toml, and codex mcp-server to run the MCP server directly.
Notifications
You can enable notifications by configuring a script that is run whenever the agent finishes a turn. The notify documentation includes a detailed example that explains how to get desktop notifications via terminal-notifier on macOS. When Codex detects that it is running under WSL 2 inside Windows Terminal (WT_SESSION is set), the TUI automatically falls back to native Windows toast notifications so approval prompts and completed turns surface even though Windows Terminal does not implement OSC 9.
codex exec to run Codex programmatically/non-interactively
To run Codex non-interactively, run codex exec PROMPT (you can also pass the prompt via stdin) and Codex will work on your task until it decides that it is done and exits. If you provide both a prompt argument and piped stdin, Codex appends stdin as a <stdin> block after the prompt so patterns like echo "my output" | codex exec "Summarize this concisely" work naturally. Output is printed to the terminal directly. You can set the RUST_LOG environment variable to see more about what's going on.
Use codex exec --ephemeral ... to run without persisting session rollout files to disk.
Experimenting with the Codex Sandbox
To test to see what happens when a command is run under the sandbox provided by Codex, we provide the following subcommands in Codex CLI:
# macOS
codex sandbox macos [--full-auto] [--log-denials] [COMMAND]...
# Linux
codex sandbox linux [--full-auto] [COMMAND]...
# Windows
codex sandbox windows [--full-auto] [COMMAND]...
# Legacy aliases
codex debug seatbelt [--full-auto] [--log-denials] [COMMAND]...
codex debug landlock [--full-auto] [COMMAND]...
Selecting a sandbox policy via --sandbox
The Rust CLI exposes a dedicated --sandbox (-s) flag that lets you pick the sandbox policy without having to reach for the generic -c/--config option:
# Run Codex with the default, read-only sandbox
codex --sandbox read-only
# Allow the agent to write within the current workspace while still blocking network access
codex --sandbox workspace-write
# Danger! Disable sandboxing entirely (only do this if you are already running in a container or other isolated env)
codex --sandbox danger-full-access
The same setting can be persisted in ~/.codex/config.toml via the top-level sandbox_mode = "MODE" key, e.g. sandbox_mode = "workspace-write".
In workspace-write, Codex also includes ~/.codex/memories in its writable roots so memory maintenance does not require an extra approval.
Code Organization
This folder is the root of a Cargo workspace. It contains quite a bit of experimental code, but here are the key crates:
core/contains the business logic for Codex. Ultimately, we hope this becomes a library crate that is generally useful for building other Rust/native applications that use Codex.exec/"headless" CLI for use in automation.tui/CLI that launches a fullscreen TUI built with Ratatui.cli/CLI multitool that provides the aforementioned CLIs via subcommands.
If you want to contribute or inspect behavior in detail, start by reading the module-level README.md files under each crate and run the project workspace from the top-level codex-rs directory so shared config, features, and build scripts stay aligned.