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cast-why

95 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By codecast-sh/codecast (GitHub) · coding · 44 stars · scanned at commit fc0f0d8

Explain why a line of code is the way it is. Traces the line through cast blame to the codecast session that wrote it and the message where it was decided, then answers from the author's own reasoning. Use when asked why code looks like this, who wrote it and why, or what the intent behind a change was.

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/'cast-why' ] || [ -L ~/.agents/skills/'cast-why' ]; then echo 'A skill folder named cast-why already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/codecast-sh/codecast' "$d" && git -C "$d" checkout --quiet 'fc0f0d8c2340edbbdb9708d9a8eacf22aaa1d67b' -- 'packages/cli/skills/cast-why' && mkdir -p ~/.agents/skills && cp -R "$d"/'packages/cli/skills/cast-why' ~/.agents/skills/'cast-why' && 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/'cast-why' ~/.claude/skills/'cast-why' (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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