codex

Codex CLI automates deterministic code analysis and refactoring by executing analysis tasks and applying automated edits across your project. Install Codex CLI, connect to your codebase, and run codex exec commands with analysis or refactoring parameters to perform syntax review, architecture analysis, and multi-file refactoring in a controlled sandbox environment.

Yes, Codex CLI supports HPC and Slurm environments with sandbox controls and model selection constraints. It detects your environment automatically and provides stdin-based pipelines for blocked files, resume sessions, and profile-based configurations—use the --yolo flag to override sandbox restrictions on HPC clusters when needed.

Codex CLI offers three sandbox modes: read-only (analysis only), workspace-write (safe edits to project files), and danger-full-access (unrestricted changes). HPC environments override sandbox mode with --yolo when authorized. Configure your execution with essential flags like -m (model), -c (config), -s (sandbox), and -C (constraints) to control risk and output behavior.

Codex CLI handles large file analysis and multi-file refactoring through command construction with flags like --full-auto for deterministic execution and --skip-git-repo-check for cross-directory projects. Use stderr redirection, execution validation, and resume support to manage long-running or complex tasks across your entire codebase.

Codex CLI supports profile-based configurations that persist settings across projects, eliminating repetitive manual setup. Define profiles with your preferred models, sandbox levels, and command flags, then reuse them across different codebases and environments.

Codex CLI validates execution and captures stderr for error handling and diagnostics. Resume sessions allow you to restart interrupted analysis or refactoring tasks without losing progress, supporting long-running operations and interrupted workflows in unstable HPC environments.