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/weill-labs/hgm/pre-compactgit clone --depth 1 https://github.com/weill-labs/hgmWrote 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/weill-labs/hgm/pre-compact)<a href="https://agentmods.dev/hooks/weill-labs/hgm/pre-compact"><img src="https://agentmods.dev/badge/hooks/weill-labs/hgm/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
100% identical to PreCompact — 0 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": [
{
"command": "bd prime",
"type": "command"
}
],
"matcher": ""
}
]
}What else settings.json configures
This page is one entry in a file that holds 3. 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 5cbb0be3852a
PreCompact is a hook published in the GitHub repository weill-labs/hgm (2 stars, last pushed 3mo 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 100% identical to PreCompact, differing in 0 lines, and is treated as a copy.
Other hooks, from other repositories
SessionStart
Runs when a session starts, executing install-runtime.mjs and session-context.mjs via node (2 commands). From ndom91/open-plan-annotator.
PreToolUse
Runs before the agent uses a tool for ExitPlanMode tool calls, executing open-plan-annotator.mjs via node. From ndom91/open-plan-annotator.
SessionStart
Runs when a session starts on startup, clear, compact and resume, running an inline shell check. From omerakben/code-oz.
SessionStart
Runs when a session starts on startup, executing cloud_agent_setup.sh. From tilework-tech/nori-skillsets.
PreToolUse
Runs before the agent uses a tool for Read, read, read_file, file_read, Grep, grep, Search, search and code_search tool calls, running warden hook redirect (2 commands). From rynald0cst0ltziam/Warden-AI.
PermissionRequest
Runs when the agent asks permission for an action for ExitPlanMode tool calls, executing open-plan-annotator.mjs via node. From ndom91/open-plan-annotator.