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Cross Platform Determinism

Category: Engineering  ·  Sub-category: frontend  ·  Last updated:
For any script that produces a file the repo COMMITS and CI DIFFS — generated HTML, lockfiles, JSON snapshots, fixture files, documentation rendered from source. The output must be byte-identical regardless of who regenerated it or on what OS. This skill catches the specific failure modes that turn a freshness gate into a paper tiger that fails forever — OS-dependent path separators, locale-dependent encodings, nondeterministic ordering, drifting timestamps. Triggers on phrases like "freshness check failing", "regenerated locally but diff doesn't match", "works in CI not on Windows", "generator produces different output", and on any review of a script whose output is committed.
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From the source SKILL.md

A generated artifact that is committed to the repo and diff-checked in CI must be byte-identical regardless of who regenerated it or on what OS. If a Windows contributor regenerates and the bytes drift, the freshness gate fails forever — until someone hand-fixes the platform difference, which usually means quietly committing whatever the gate accepts and moving on.

What this skill does

Cross Platform Determinism is a community-contributed Claude Code skill in the frontend sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/cross-platform-determinism/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Cross Platform Determinism Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ 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/cross-platform-determinism
curl -L https://claudskills.com/skills/cross-platform-determinism/SKILL.md \
  -o ~/.claude/skills/cross-platform-determinism/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/cross-platform-determinism/. Claude Code auto-discovers it on next session.

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

Telegram

📱 Install from your phone or desktop Telegram

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 →

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

Frequently asked questions

How do I install the Cross Platform Determinism Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/cross-platform-determinism/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Cross Platform Determinism skill do?
For any script that produces a file the repo COMMITS and CI DIFFS — generated HTML, lockfiles, JSON snapshots, fixture files, documentation rendered from source. The output must be byte-identical regardless of who regenerated it or on what OS. This skill catches the specific failure modes that turn a freshness gate into a paper tiger that fails forever — OS-dependent path separators, locale-dependent encodings, nondeterministic ordering, drifting timestamps. Triggers on phrases like "freshness check failing", "regenerated locally but diff doesn't match", "works in CI not on Windows", "generator produces different output", and on any review of a script whose output is committed.
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.
When should I use the Cross Platform Determinism skill?
Use Cross Platform Determinism when your Claude Code task falls under the Engineering category — specifically in the frontend area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Cross Platform Determinism" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Cross Platform Determinism skill fit in?
A Claude Code skill is a 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. Cross Platform Determinism is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
mcorbett51090. (2026). Cross Platform Determinism [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/cross-platform-determinism/
BibTeX
@misc{cross-platform-determinism-2026,
  author    = {mcorbett51090},
  title     = {Cross Platform Determinism [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/cross-platform-determinism/}
}

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Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

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