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.
git clone --depth 1 https://github.com/superbasedapp/observerWrote 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/superbasedapp/observer/pre-compact)<a href="https://agentmods.dev/hooks/superbasedapp/observer/pre-compact"><img src="https://agentmods.dev/badge/hooks/superbasedapp/observer/pre-compact/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/hooks/superbasedapp/observer/pre-compact"><img src="https://agentmods.dev/badge/hooks/superbasedapp/observer/pre-compact.svg" alt="Reviewed on agentmods" width="80" 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 1mo 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What else hooks.json configures
This page is one entry in a file that holds 24. Installing the file brings all of them; each is measured and scanned on its own page.
- Hook ConfigChange A not measured
- Hook CwdChanged A not measured
- Hook InstructionsLoaded A not measured
- Hook Notification A not measured
- Hook PermissionDenied A not measured
- Hook PermissionRequest A not measured
- Hook PostCompact A not measured
- Hook PostToolBatch A not measured
- Hook PostToolUse A not measured
- Hook PostToolUseFailure A not measured
- Hook PreToolUse A not measured
- Hook SessionEnd A not measured
- Hook SessionStart A not measured
- Hook Setup A not measured
- Hook Stop A not measured
- Hook StopFailure A not measured
- Hook SubagentStart A not measured
- Hook SubagentStop A not measured
- Hook TaskCompleted A not measured
- Hook TaskCreated A not measured
- Hook UserPromptExpansion A not measured
- Hook UserPromptSubmit A not measured
- Hook WorktreeRemove A not measured
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.
- 1mo ago First seen · 13 lines scan A 6fbde695dfc5
PreCompact is a hook published in the GitHub repository superbasedapp/observer (50 stars, last pushed 2d ago), with no licence file. 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 memorix hook. From AVIDS2/memorix.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing run_hook.sh. From Lians-ai/Lians.
PostToolUse
Runs after a tool call finishes, running memorix hook. From AVIDS2/memorix.
PostToolUse
Runs after a tool call finishes for Write, Edit and MultiEdit tool calls, executing qring-post-edit-lint-hint.sh. From I4cTime/q-ring.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.