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/zircote/subcog/pre-compactgit clone --depth 1 https://github.com/zircote/subcogGrade A, and why
PreCompact 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 3d ago.
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
{
"PreCompact": [
{
"matcher": "*",
"hooks": [
{
"type": "command",
"command": "subcog hook pre-compact"
}
]
}
]
}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.
- 3d ago First seen · 13 lines scan A 6bdf57185491
PreCompact is a hook published in the GitHub repository zircote/subcog (28 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 2026-08-30.
Other hooks, from other repositories
SessionStart
Runs when a session starts, running echo 'IMPORTANT: If you notice that SocratiCode MCP tools ap. From giancarloerra/SocratiCode.
SessionStart
Runs when a session starts on startup, resume, clear and compact, running recall-hooks. From GiulioDER/RE-call.
PreToolUse
Runs before the agent uses a tool for Write, Edit, MultiEdit, NotebookEdit and Bash tool calls, running recall-hooks. From GiulioDER/RE-call.
PreCompact
Runs before the context is compacted for manual and auto tool calls, running recall-hooks. From GiulioDER/RE-call.
SessionEnd
Runs when a session ends for clear, resume, logout, prompt_input_exit and other tool calls, running recall-hooks. From GiulioDER/RE-call.
SessionStart
Runs when a session starts on startup, resume and compact, executing kb-ledger-hook.sh via sh. From riemannulus/knowledge-base.