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/shafthq/shaft_engine/subagent-stopgit clone --depth 1 https://github.com/ShaftHQ/SHAFT_ENGINEGrade 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.
This is a copy
94% identical to PreCompact — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
{
"SubagentStop": [
{
"hooks": [
{
"command": "python3 -c \"import os,pathlib,runpy;os.environ['CHAOS_ENGINE_HOST']='claude';cands=('.chaos-engine/hooks/guard.py','plugins/chaos-engine/hooks/guard.py','chaos-engine/hooks/guard.py');p=next((root/rel for root in (pathlib.Path.cwd(),*pathlib.Path.cwd().parents) for rel in cands if (root/rel).is_file()),None);runpy.run_path(str(p),run_name='__main__') if p else print('{}')\"",
"commandWindows": "py -3 -c \"import os,pathlib,runpy;os.environ['CHAOS_ENGINE_HOST']='claude';cands=('.chaos-engine/hooks/guard.py','plugins/chaos-engine/hooks/guard.py','chaos-engine/hooks/guard.py');p=next((root/rel for root in (pathlib.Path.cwd(),*pathlib.Path.cwd().parents) for rel in cands if (root/rel).is_file()),None);runpy.run_path(str(p),run_name='__main__') if p else print('{}')\"",
"timeout": 30,
"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 d6fe2c014530
SubagentStop is a hook published in the GitHub repository ShaftHQ/SHAFT_ENGINE (407 stars, last pushed today), 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. It is 94% identical to PreCompact, differing in 2 lines, and is treated as a copy.
Other hooks, from other repositories
SubagentStop
Runs when a subagent finishes, executing subagent_stop.py via python3. From openmemind/memind.
SubagentStop
Runs when a subagent finishes, executing cc10x_event_logger.py via python3. From romiluz13/cc10x.
SubagentStop
Runs when a subagent finishes, executing memx-hook.mjs via node. From NeoLi00/memX.
PostToolUse
Runs after a tool call finishes for Edit, Write, Edit and Write tool calls, executing auto-format-touched.sh and log-tdd-state-transition.sh (2 commands). From loiane/specs-driven-development-spring-angular.
Stop
Runs when the agent finishes a response, executing dag-tripwire.py and ledger-tripwire.py via python3 (2 commands). From Buckeyes22/subagent-model-routing.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing route-natural-language-aliases.sh. From loiane/specs-driven-development-spring-angular.