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/michalstrnadel/scorekeeper/pre-compactgit clone --depth 1 https://github.com/michalstrnadel/scorekeeperWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/hooks/michalstrnadel/scorekeeper/pre-compact)<a href="https://agentmods.dev/hooks/michalstrnadel/scorekeeper/pre-compact"><img src="https://agentmods.dev/badge/hooks/michalstrnadel/scorekeeper/pre-compact.svg" alt="Measured on agentmods" height="20"></a>Grade 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.
This is a copy
77% identical to SessionEnd — 5 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": [
{
"hooks": [
{
"type": "command",
"command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/run.sh\" pre-compact",
"timeout": 15
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 6. Installing the file brings all of them; each is measured and scanned on its own page.
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 522beb9f72e0
PreCompact is a hook published in the GitHub repository michalstrnadel/scorekeeper (2 stars, last pushed 1mo ago), licensed Apache-2.0. 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 77% identical to SessionEnd, differing in 5 lines, and is treated as a copy.
Other hooks, from other repositories
PreToolUse
Runs before the agent uses a tool for Bash tool calls, executing code_scanner_hook.py, observability_hook.py and pii_checker_hook.py via python3 (3 commands). From alibaba/anolisa.
SessionStart
Runs when a session starts, executing hook_session.py via python3. From ppgranger/token-saver.
PreCompact
Runs before the context is compacted, executing on_pre_compact.sh. From atomicstrata/atomicmemory.
PreToolUse
Runs before the agent uses a tool for Write and Edit tool calls, executing block_memory_write.sh. From atomicstrata/atomicmemory.
PostCompact
Runs after the context is compacted, executing on_post_compact.sh. From atomicstrata/atomicmemory.
Stop
Runs when the agent finishes a response, running python3. From memseekai/memseek.