Cross-tool onboarding skill: gives a non-Claude-Code agent the equivalent context Claude Code gets from CLAUDE.md, without assuming the agent has read it. The single-source-of-truth doc all 2026 agents read is AGENTS.md — this skill points there first, then layers in the 2026 H1 mechanical mitigations the marketplace expects.
Codex Onboarding is a community-contributed Claude Code skill in the business-ops sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/codex-onboarding/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when this repo will be operated on by a coding agent that does NOT natively read CLAUDE.md.
The Codex Onboarding Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 153,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/codex-onboarding curl -L https://claudskills.com/skills/codex-onboarding/SKILL.md \ -o ~/.claude/skills/codex-onboarding/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/codex-onboarding/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/codex-onboarding/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\codex-onboarding\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/codex-onboarding/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Codex Onboarding is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{codex-onboarding-2026,
author = {mcorbett51090},
title = {Codex Onboarding [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/codex-onboarding/}
}Grade A · scanned 2026-07-18 — free static scan against the OWASP Agentic Skills Top 10.
The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.
Browse all General skills in the ClaudSkills registry, or explore these other picks from the same category:
Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore
SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.