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/tractorjuice/arckit-claude/post-compactgit clone --depth 1 https://github.com/tractorjuice/arckit-claudeWrote 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/tractorjuice/arckit-claude/post-compact)<a href="https://agentmods.dev/hooks/tractorjuice/arckit-claude/post-compact"><img src="https://agentmods.dev/badge/hooks/tractorjuice/arckit-claude/post-compact.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
PostCompact 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What else hooks.json configures
This page is one entry in a file that holds 10. 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.
- yesterday First seen · 17 lines scan A 42c8cf5e17cb
PostCompact is a hook published in the GitHub repository tractorjuice/arckit-claude (4 stars, last pushed yesterday), 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 2026-09-03.
Other hooks, from other repositories
BeforeTool
Runs on the BeforeTool event for write_file, write_file and edit_file tool calls, executing validate-filename.py and file-protection.py via python3 (2 commands). From tractorjuice/arckit-gemini.
SessionStart
Runs when a session starts, executing session-start.py via python3. From tractorjuice/arckit-gemini.
AfterTool
Runs on the AfterTool event for write_file tool calls, executing update-manifest.py via python3. From tractorjuice/arckit-gemini.
SubagentStop
Runs when a subagent finishes, executing reaction.js. From Uncle-Peke/ui-chan-mcp.
Stop
Runs when the agent finishes a response, executing reaction.js. From Uncle-Peke/ui-chan-mcp.
PreCompact
Runs before the context is compacted, executing reaction.js. From Uncle-Peke/ui-chan-mcp.