agent-toolkit: Hook for Claude Code

.claude/settings.json

PreCompact is a hook for Claude Code from sageox/agent-toolkit. Its token cost is not measured, scanned A, a copy of PostToolUse, Apache-2.0.

A pre-compaction hook that runs a SageOx shell command before an agent's conversation context is shortened.

In plain words
What is it for?
It is for connecting context-compaction events to SageOx's agent tools in Claude Code.
Why use it?
It lets the repository save or prepare team context before older conversation details are removed. If SageOx is not installed, it prints an installation notice.

Hook for Claude Code

Written for Claude Code: PreCompact hook event.

This is sageox/agent-toolkit's own configuration. It tells Claude Code how to work on agent-toolkit itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agent-toolkit configures →

One of 7 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 6 are separate, each on its own page.

Reuse

Borrowing it

Nothing to install: this file belongs to sageox/agent-toolkit. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/sageox/agent-toolkit/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/sageox/agent-toolkit

Made for: Claude Code.

Wrote 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.

agentmods badge for PreCompact

README.md
[![agentmods](https://agentmods.dev/badge/hooks/sageox/agent-toolkit/pre-compact/github.svg)](https://agentmods.dev/hooks/sageox/agent-toolkit/pre-compact)
Your own site
<a href="https://agentmods.dev/hooks/sageox/agent-toolkit/pre-compact"><img src="https://agentmods.dev/badge/hooks/sageox/agent-toolkit/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.

agentmods 80×15 button for PreCompact

Your own site · 80×15
<a href="https://agentmods.dev/hooks/sageox/agent-toolkit/pre-compact"><img src="https://agentmods.dev/badge/hooks/sageox/agent-toolkit/pre-compact.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 88% copy Near-identical to another mod in the catalogue.
Security

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 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.

Origin

This is a copy

88% identical to PostToolUse — 4 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.

.claude/settings.json · 13 lines

What it actually says

{
  "PreCompact": [
    {
      "hooks": [
        {
          "command": "if command -v ox >/dev/null 2>&1; then AGENT_ENV=claude-code ox agent hook PreCompact 2>&1 || true; else echo 'This repo uses SageOx: install https://github.com/sageox/ox for optimized team context.'; fi",
          "type": "command"
        }
      ],
      "matcher": ""
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 7. Installing the file brings all of them; each is measured and scanned on its own page.

Changes

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.

  1. yesterday First seen · 13 lines scan A 2588c29e76f5

Subscribe to this mod's changes

PreCompact is a hook published in the GitHub repository sageox/agent-toolkit (10 stars, last pushed today), 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 88% identical to PostToolUse, differing in 4 lines, and is treated as a copy.