The thing I actually got done this weekend was migrating my Claude Code personal environment over to Codex.
Honestly, I have been reaching for Codex more and more. Beyond the generous quota resets, GPT-5.5 has dropped that oily tone — work conversations feel grounded again. Meanwhile Opus 4.7 keeps making me want to slap it.
But moving an entire harness over is hard.
The pain points
- Harness migration touches many configs and files; the workflow is tedious
- MCPs, hooks, and other key bits need manual handling, with high trial-and-error cost
- After future updates on either side, the two environments drift quickly
- Migrating a personal workflow end-to-end takes serious time and energy
What the Skill does
I packaged the migration into a Skill:
- Produces a Claude Code → Codex migration plan in about half an hour
- Auto-handles
claude.md/agents.md, Skills, and other base settings - Helps with the trickier stuff like MCPs and hooks
- Provides a “maintenance mode” that diffs changes and syncs them across to Codex
- Reduces manual operations and try-and-fail risk
Repo: https://github.com/danyuchn/claude-codex-harness-sync
A side gripe: Codex CLI still has gaps
After using Codex for a stretch, the most painful gap is the CLI — /rewind not being available is hard to forgive. On Claude Code, /rewind is daily survival. After migrating, the first time you make a wrong turn you realize there is no clean undo. Either git stash or rerun the whole conversation. Productivity hit is real.
Hoping OpenAI ships those CLI updates soon.
A small accident with image generation
While generating images, I noticed something: issuing image prompts directly inside Codex produces better results than having Claude Code hand them off to Codex.
Why? Because Claude tends to issue over-constrained prompts, while GPT-image-2 actually shines with fewer constraints — its creativity lives in the negative space.
The more layers of intermediation, the more the original intent gets “polished” away. Worth thinking about for any cross-agent task handoff, not just image generation.