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/lavallee/cub/pre-compactgit clone --depth 1 https://github.com/lavallee/cubGrade 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 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
91% identical to PostToolUse — 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
{
"PreCompact": [
{
"matcher": "*",
"hooks": [
{
"type": "command",
"command": "${CLAUDE_PROJECT_DIR}/.cub/scripts/hooks/cub-hook.sh",
"timeout": 10
}
]
}
]
}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 1a4ab32dd421
PreCompact is a hook published in the GitHub repository lavallee/cub (5 stars, last pushed 6mo 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. It is 91% identical to PostToolUse, differing in 2 lines, and is treated as a copy.
Other hooks, from other repositories
BeforeTool
Runs on the BeforeTool event for write_file and replace tool calls, executing enforce-obsidian-writes.sh. From thoreinstein/beads-workflow.
SessionStart
Runs when a session starts, executing session-context.sh. From thoreinstein/beads-workflow.
SessionEnd
Runs when a session ends, executing compound-reminder.sh. From thoreinstein/beads-workflow.
PostToolUse
Runs after a tool call finishes for Bash and mcp__.* tool calls, executing log-terminal.sh and log-mcp.sh (2 commands). From gh33k/session-plugin.
SessionEnd
Runs when a session ends, executing session-end.sh. From gh33k/session-plugin.
SessionStart
Runs when a session starts, executing session-start.sh. From gh33k/session-plugin.