Coding harnesses

Codex CLI

OpenAI's terminal agent with parallel sessions + PR integration.

Overview

Codex CLI runs multiple agent sessions in parallel and integrates cleanly with GitHub PRs. Best when you're orchestrating several agents on independent worktrees.

Best for

Parallel agent orchestration
OpenAI-heavy stacks

Trade-offs

vs claude-code

Codex CLI for parallel-session breadth; Claude Code for skill-system depth.

What XeroHack pre-wires

When you pick Codex CLI in the interview, the engine emits these files into your scaffold:

AGENTS.md

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