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claude-token-efficient: Hook for Claude Code

.claude/settings.json

PreCompact is a hook for Claude Code from drona23/claude-token-efficient. Its token cost is not measured, scanned A, original, MIT.

A pre-compaction hook that saves current changes to a Git checkpoint before the agent's conversation context is shortened. Git is a version-control system that records file changes.

In plain words
What is it for?
Use it to stage and automatically commit local changes before context compaction, allowing work to continue from a saved checkpoint.
Why use it?
It helps preserve work that might otherwise be difficult to recover when the context is compacted.

Hook for Claude Code

Written for Claude Code: PreCompact hook event.

This is drona23/claude-token-efficient's own configuration. It tells Claude Code how to work on claude-token-efficient 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 claude-token-efficient configures →

One of 2 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

not rated 6.1krepo +13 4mo ago A scan tokens not measured original MIT
View source ↗ drona23/claude-token-efficient
About the project

claude-token-efficient is a single instruction file that tells Claude to respond more briefly, reducing unnecessary output and token use during coding work. It is for people using Claude Code or other models that read project context. The catalogue entry is the project's drop-in instruction file.

drona23/claude-token-efficient · 6,149 stars · on GitHub

Reuse

Borrowing it

Nothing to install: this file belongs to drona23/claude-token-efficient. 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/drona23/claude-token-efficient/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/drona23/claude-token-efficient

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/drona23/claude-token-efficient/pre-compact/github.svg)](https://agentmods.dev/hooks/drona23/claude-token-efficient/pre-compact)
Your own site
<a href="https://agentmods.dev/hooks/drona23/claude-token-efficient/pre-compact"><img src="https://agentmods.dev/badge/hooks/drona23/claude-token-efficient/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/drona23/claude-token-efficient/pre-compact"><img src="https://agentmods.dev/badge/hooks/drona23/claude-token-efficient/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 original No closer match found 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 2mo 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.

.claude/settings.json · 12 lines

What it actually says

{
  "PreCompact": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "git -C \"$PWD\" add -A && git -C \"$PWD\" diff --cached --quiet || git -C \"$PWD\" commit -m \"auto-save: pre-compaction checkpoint\" --no-verify 2>/dev/null || true"
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 2. 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. 2mo ago First seen · 12 lines scan A cbdf7b4fe3cf

Subscribe to this mod's changes

PreCompact is a hook published in the GitHub repository drona23/claude-token-efficient (6,149 stars, last pushed 4mo 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

PreCompact compared with hooks from other repositories

PreCompact next to 6 hooks from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
PreCompactdrona23/claude-token-efficientHook6.1k4mo agoMITA—Claude Code
PostToolUsesupabase/supabaseHook115kyesterdayApache-2.0A—Claude Code
SessionStartsupabase/supabaseHook115kyesterdayApache-2.0A—Claude Code
SessionStartgoogle-gemini/gemini-cliHook109kyesterdayApache-2.0A—Claude Code
PreToolUseapache/supersetHook75kyesterdayApache-2.0A—Claude Code
PreToolUseanthropics/claude-cookbooksHook54k2d agoMITA—Claude Code
PostToolUseanthropics/claude-plugins-officialHook46kyesterdayApache-2.0A—Claude Code