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rubber-ducky

100 / 100 · Low risk

Fine to try.

By harnessprotocol/harness-kit (GitHub) · coding · 10 stars · scanned at commit 4094970

Use when you've planned a non-trivial change and are about to implement it, finished a complex or multi-file piece of work, just wrote tests, or are stuck on repeated failures or unexpected results — and any time the user says "rubber duck this", "rubber ducky", "get a second opinion", "sanity-check my plan", "poke holes in this", "what am I missing", "critique my approach", "review this before I build it", or "/rubber-ducky". Spawns independent read-only critics on DIFFERENT Claude models than…

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/'rubber-ducky' ] || [ -L ~/.agents/skills/'rubber-ducky' ]; then echo 'A skill folder named rubber-ducky already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/harnessprotocol/harness-kit' "$d" && git -C "$d" checkout --quiet '4094970dee9a31be7b899126aca1cd4256f57ca8' -- 'plugins/rubber-ducky/skills/rubber-ducky' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/rubber-ducky/skills/rubber-ducky' ~/.agents/skills/'rubber-ducky' && 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/'rubber-ducky' ~/.claude/skills/'rubber-ducky' (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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