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shadow-mode

100 / 100 · Low risk

Fine to try.

By laurigates/claude-plugins (GitHub) · coding · 59 stars · scanned at commit 16af2dc

Shadow mode / dark-launch for validating new systems under production load. Use when testing replacement services, comparing behavior, or planning traffic mirroring for migrations.

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'shadow-mode' ] || [ -L ~/.agents/skills/'shadow-mode' ]; then echo 'A skill folder named shadow-mode already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/laurigates/claude-plugins' "$d" && git -C "$d" checkout --quiet '16af2dca8c1e706bab01e003bf03a7d19192b346' -- 'migration-patterns-plugin/skills/shadow-mode' && mkdir -p ~/.agents/skills && cp -R "$d"/'migration-patterns-plugin/skills/shadow-mode' ~/.agents/skills/'shadow-mode' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'shadow-mode' ~/.claude/skills/'shadow-mode' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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