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blindspot

95 / 100 · Low risk

Fine to try.

By vinta/hal-9000 (GitHub) · coding · 143 stars · scanned at commit ada6eb5

Use when the user asks for a blindspot pass or to find their unknown unknowns, or signals unfamiliarity with a domain, tool, or codebase area ("never used X", "first time doing Y", "no idea where to start", "don't know what I don't know") before working there. Maps the areas their request leaves unnamed, purpose and shape before mechanics, shows how people usually answer each and why, and asks which to explore next, so unknown unknowns become known unknowns they can prompt with. Recommendations…

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

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

if [ -e ~/.agents/skills/'blindspot' ] || [ -L ~/.agents/skills/'blindspot' ]; then echo 'A skill folder named blindspot already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/vinta/hal-9000' "$d" && git -C "$d" checkout --quiet 'ada6eb5ed0de3020027c7a59e5d0aeb76889528d' -- 'skills/blindspot' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/blindspot' ~/.agents/skills/'blindspot' && 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/'blindspot' ~/.claude/skills/'blindspot' (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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