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/codingagentsystem/cas/subagent-stopgit clone --depth 1 https://github.com/codingagentsystem/casGrade A, and why
SubagentStop 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
{
"SubagentStop": [
{
"hooks": [
{
"async": true,
"command": "cas hook SubagentStop",
"timeout": 5000,
"type": "command"
}
]
}
]
}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 7d48ad5f74fc
SubagentStop is a hook published in the GitHub repository codingagentsystem/cas (151 stars, last pushed 5mo 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 2026-08-30.
Other hooks, from other repositories
PreToolUse
Runs before the agent uses a tool for Bash and Task tool calls, executing pretooluse_block_raw_claude_spawn.sh and pretooluse_block_subagent.sh via bash with --show-toplevel (2 commands). From Vinix24/vnx-orchestration.
SubagentStart
Runs when a subagent starts, executing subagent.js via node. From DivyeshJayswal/minimalist.
SubagentStop
Runs when a subagent finishes, executing verify-agent-protocol.sh, verify-signal-bus-persisted.sh, auto-record-trust-verdict.sh and post-hire-verify-hook.sh (4 commands). From asiflow/hyper-claude-code.
SubagentStop
Runs when a subagent finishes, executing subagent-complete.sh. From SeongwoongCho/adaptive-harness.
SubagentStop
Runs when a subagent finishes, running echo "📋 Subagent task completed: $(date +%H:%M:%S)". From EchoingVesper/mcp-task-orchestrator.
SubagentStop
Runs when a subagent finishes, executing subagent-stop.sh. From softspark/ai-toolkit.