What is claude2codex?

A tool for copying user-created skills from Claude Code into Codex, another coding assistant environment. It finds the source skills folder, copies custom skills, and keeps Codex's built-in system skills intact.

Synchronising all custom Claude skills, or copying one selected skill into Codex with a standard SKILL.md filename.

It avoids transferring skills manually and reduces problems caused by different skill-file names or locations. It also separates personal skills from built-in ones.

claude2codex — Skill for Claude Code and Codex by phanghonghao

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add phanghonghao/THU-Awesome-Skills --skill claude2codex

Clone the repo

git clone --depth 1 https://github.com/phanghonghao/THU-Awesome-Skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/phanghonghao/thu-awesome-skills/claude2codex/github.svg)](https://agentmods.dev/skills/phanghonghao/thu-awesome-skills/claude2codex)

Your own site

<a href="https://agentmods.dev/skills/phanghonghao/thu-awesome-skills/claude2codex"><img src="https://agentmods.dev/badge/skills/phanghonghao/thu-awesome-skills/claude2codex/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/phanghonghao/thu-awesome-skills/claude2codex"><img src="https://agentmods.dev/badge/skills/phanghonghao/thu-awesome-skills/claude2codex.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 734 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00069	$0.00734
Opus 5.5	$0.00028	$0.00294
Sonnet 5.5	$0.00014	$0.00147
Haiku 4.5	$0.00007	$0.00073

Measured 2mo ago against content hash 6942e3cac505, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude2codex scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/sync-skills.ps1), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/claude2codex/SKILL.md · 94 lines

How it starts

The opening of the file, as written. The whole thing — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude to Codex (claude2codex)

Synchronize user-created Claude Code skills into Codex.

Scope

Source: Claude user skills folder, auto-discovered from the local Claude environment
Default source fallback: %USERPROFILE%\.claude\skills
Target: %USERPROFILE%\.codex\skills
Preserve: %USERPROFILE%\.codex\skills\.system

Default behavior is to sync user/custom Claude skills only. You do not need to include Anthropic built-in system skills because they are not stored in this source folder and Codex already has its own .system.

The sync logic should treat both SKILL.md and skill.md as valid skill entry files. When copying to Codex, normalize to SKILL.md so skill discovery is more reliable across environments.

When To Use

Use this skill when the user asks to:

sync Claude skills to Codex
update Codex skills from Claude
replace a Codex skill with the Claude version
copy one specific skill from Claude to Codex

Modes

Full Sync

For requests like:

"sync all Claude skills to Codex"
"update Codex skills from Claude"

Run:

powershell -ExecutionPolicy Bypass -File "<SKILL_ROOT>\scripts\sync-skills.ps1" -Mode full

Behavior:

Creates a backup of existing Codex user skills
Removes all Codex skills except .system
Copies all skills from Claude source folder into Codex
Resolves junction/source links by copying real contents
Normalizes skill.md to SKILL.md when needed
Verifies sync result before cleaning up backup

Single Skill Sync

For requests like:

"sync github-trending to Codex"
"update md2tex skill to Codex"

Run:

powershell -ExecutionPolicy Bypass -File "<SKILL_ROOT>\scripts\sync-skills.ps1" -Mode single -SkillName github-trending

Behavior:

Backs up the current Codex copy of that skill if it exists
Replaces only that one target skill
Normalizes skill.md to SKILL.md when needed
Verifies sync result before cleaning up backup

Output Handling

Read the full file on GitHub · 94 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

scripts/sync-skills.ps1 8.1 KB runs code

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 94 lines · 69 tokens per session scan A 6942e3cac505

Subscribe to this mod's changes

claude2codex is a skill published in the GitHub repository phanghonghao/THU-Awesome-Skills (8 stars, last pushed 3mo ago), licensed MIT. It adds 69 tokens to every session and 734 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents

claude2codex next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
claude2codexphanghonghao/THU-Awesome-Skills	Skill	8	3mo ago	MIT	A	69	Claude Code, Codex
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	yesterday	MIT	A	200	Claude Code, Codex
playwright-climicrosoft/playwright	Skill	100k	yesterday	Apache-2.0	A	19	Claude Code
browser-automationopenclaw/openclaw	Skill	394k	today	MIT	A	36	Claude Code
systematic-debuggingobra/superpowers	Skill	314k	4d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code