How do I install the Claude Codex Upstream Update Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/claude-codex-upstream-update/SKILL.md and restart Claude Code. Both flows are detailed at https://claudskills.com/install/.

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

ClaudSkills / Science & Research / science-misc

Claude Codex Upstream Update

Category: Science & Research · Sub-category: science-misc · Last updated: 2026-05-21

ai:claude

Use when researching Claude Code or Codex upstream releases, selecting adaptations, or preparing Harness upgrades. Local-only; not for distribution.

From the source SKILL.md

A local-only skill for taking Claude Code and Codex upstream updates all the way through to Harness implementation diffs. The goal is not to "introduce updates" but to "actually make Harness stronger."

What this skill does

Claude Codex Upstream Update is a community-contributed Claude Code skill in the science-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/claude-codex-upstream-update/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when researching Claude Code or Codex upstream releases, selecting adaptations, or preparing Harness upgrades. Local-only; not for distribution.

Who uses this skill

The Claude Codex Upstream Update Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/claude-codex-upstream-update
curl -L https://claudskills.com/skills/claude-codex-upstream-update/SKILL.md \
  -o ~/.claude/skills/claude-codex-upstream-update/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/claude-codex-upstream-update/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/claude-codex-upstream-update/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\claude-codex-upstream-update\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

Source: https://github.com/anthropics/claude-code
Author: anthropics

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Browse all Science & Research skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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Claude Codex Upstream Update

From the source SKILL.md

What this skill does

Who uses this skill

How to install

Manual install (2 steps)

One-click install via the desktop app

Attribution & license

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