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avoid-widening

100 / 100 · Low risk

Fine to try.

By jiayaoqijia/cryptoskill (GitHub) · other · 81 stars · scanned at commit 0dc9f60

Keep a type as narrow as the value it describes. An annotation wider than what inference already knows throws information away, so annotate only to add information. Keep immutable lookup tables literal with `as const satisfies`, type built keys with template literal types and build them `as const`, and widen on purpose only at a boundary where inference is unsound.

Works with any agent that supports SKILL.md skills.

Partially scanned — some files couldn't be read; we'll retry on the next scan

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/'avoid-widening' ] || [ -L ~/.agents/skills/'avoid-widening' ]; then echo 'A skill folder named avoid-widening already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/jiayaoqijia/cryptoskill' "$d" && git -C "$d" checkout --quiet '0dc9f60ab1f3fcae24da49c4cef09c46c589f903' -- 'skills/wallets/metamask-official-avoid-widening' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/wallets/metamask-official-avoid-widening' ~/.agents/skills/'avoid-widening' && 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/'avoid-widening' ~/.claude/skills/'avoid-widening' (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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