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startup-hook-skill

77 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a coding skill usually runs build and test commands.

By asgeirtj/system_prompts_leaks (GitHub) · coding · 71,387 stars · scanned at commit 2209631

Creating and developing startup hooks for Claude Code cloud sessions. Use only when the user asks for a SessionStart hook committed to their repository. Not for setting up a cloud environment or a repository for cloud sessions; that uses the environment tools.

Works with any agent that supports SKILL.md skills.

What this skill can do

Safer alternatives

Low-risk skills in the same category (coding) that look related. Check that one does what you need.

• 85 Low riskstartup-hook-skillagentydragon/ducktape · 11 stars
• 85 Low riskhook-developmentdiegosouzapw/awesome-omni-skill · 66 stars
• 95 Low riskHook DevelopmentMicrock/ordinary-claude-skills · 413 stars

Install

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

if [ -e ~/.agents/skills/'startup-hook-skill' ] || [ -L ~/.agents/skills/'startup-hook-skill' ]; then echo 'A skill folder named startup-hook-skill already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/asgeirtj/system_prompts_leaks' "$d" && git -C "$d" checkout --quiet '2209631d6d3da737c22159ed03c5127734b187f3' -- 'Anthropic/claude-code/skills/session-start-hook' && mkdir -p ~/.agents/skills && cp -R "$d"/'Anthropic/claude-code/skills/session-start-hook' ~/.agents/skills/'startup-hook-skill' && 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/'startup-hook-skill' ~/.claude/skills/'startup-hook-skill' (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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