Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add hooks/loopdive/js2/user-prompt-submitgit clone --depth 1 https://github.com/loopdive/js2Grade B, and why
UserPromptSubmit scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
"command": "mkdir -p ~/.claude/pending-notify && date +%s > ~/.claude/last-user-activity && find ~/.claude/pending-notify -type f -delete 2>/dev/null || true", What it actually says
{
"UserPromptSubmit": [
{
"matcher": "",
"hooks": [
{
"type": "command",
"command": "mkdir -p ~/.claude/pending-notify && date +%s > ~/.claude/last-user-activity && find ~/.claude/pending-notify -type f -delete 2>/dev/null || true",
"timeout": 2
}
]
}
]
}What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 14 lines scan B cf45b28ec678
UserPromptSubmit is a hook published in the GitHub repository loopdive/js2 (59 stars, last pushed yesterday), licensed Apache-2.0. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other hooks, from other repositories
SessionStart
Runs when a session starts, running an inline shell check. From growthxai/output.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.
PreToolUse
Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.
SessionStart
Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.