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/hbkdad/arc/session-startgit clone --depth 1 https://github.com/hbkdad/arcGrade A, and why
SessionStart scanned grade A with 0 findings 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
{
"SessionStart": [
{
"hooks": [
{
"type": "command",
"command": "( cd \"C:/AI-Projects/acrtest\" && nohup uv run acr dashboard serve --open-browser >/tmp/acr-dashboard-hook.log 2>&1 & )",
"timeout": 5,
"statusMessage": "Starting ACR dashboard..."
}
]
}
]
}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 A 47c4920380d1
SessionStart is a hook published in the GitHub repository hbkdad/arc (4 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other hooks, from other repositories
Stop
Runs when the agent finishes a response, executing stop_report_hook.sh, tmux_signal_stop_receipt.sh and session_stop_rotation.py via bash with --show-toplevel (3 commands). From Vinix24/vnx-orchestration.
PreToolUse
Runs before the agent uses a tool for Edit, Write and MultiEdit tool calls, running an inline shell check. From kevinlin/cowork-z.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, executing guard-release-notes.sh via sh. From RikaiDev/yomi.
Notification
Runs when the agent sends a notification for permission_prompt, idle_prompt and auth_success tool calls, running cas hook Notification. From codingagentsystem/cas.
SubagentStart
Runs when a subagent starts for task-verifier tool calls, running cas hook SubagentStart. From codingagentsystem/cas.
SessionEnd
Runs when a session ends, running cas hook SessionEnd. From codingagentsystem/cas.