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PreCompact

PreCompact is a hook for Claude Code from intentdriven/abcd. Its token cost is not measured, scanned A, original, MIT.

A pre-compaction hook that runs a setup script before the agent's conversation context is shortened, then resets abcd's prompt-routing state.

In plain words
What is it for?
Use it to reinitialize abcd before context compaction so later prompts can continue using its rules.
Why use it?
It helps restore the routing rules after context compaction and reports when the required tool cannot be installed or found.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the abcd plugin — 39 commands, 22 agents, 10 hooks shipped together

One of 9 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 8 are separate, each on its own page.

not rated 4repo changed 1mo ago A scan tokens not measured original MIT

Good fit Use it to reinitialize abcd before context compaction so later prompts can continue using its rules.

Compare 6 hooks from other repositories ↓
View source ↗ intentdriven/abcd abcdev.app
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add intentdriven/abcd
Claude Code
/plugin install abcd

Made for: Claude Code.

Or install abcd, the plugin that ships this one along with the rest of its 39 commands, 22 agents, 10 hooks.

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/intentdriven/abcd/pre-compact/github.svg)](https://agentmods.dev/hooks/intentdriven/abcd/pre-compact)
Your own site
<a href="https://agentmods.dev/hooks/intentdriven/abcd/pre-compact"><img src="https://agentmods.dev/badge/hooks/intentdriven/abcd/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/intentdriven/abcd/pre-compact"><img src="https://agentmods.dev/badge/hooks/intentdriven/abcd/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 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.

hooks/hooks.json · 13 lines

What it actually says

{
  "PreCompact": [
    {
      "hooks": [
        {
          "type": "command",
          "statusMessage": "abcd: checking the plugin binary; a first run downloads it, so this can take a while",
          "command": "sh \"${CLAUDE_PLUGIN_ROOT}/hooks/pre-compact.sh\""
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 9. 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. 1mo ago Changed b5f7eefcb8fb
  2. 1mo ago Changed 93779b153503
  3. 1mo ago Changed · +1 lines 99e80153dbd3
  4. 1mo ago Changed 75dff6c31bef
  5. 1mo ago Changed d5ddafeba7ca
  6. 1mo ago Changed ba5836592fe4
  7. 2mo ago Changed 197ec09be08d
  8. 2mo ago First seen · 12 lines scan A d82c0b1b8d14

Subscribe to this mod's changes

PreCompact is a hook published in the GitHub repository intentdriven/abcd (4 stars, last pushed today), 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 2026-08-31.

Memory and contextagentic-aiagentic-frameworkagentic-workflowcli-tool
Related

PreCompact compared with hooks from other repositories

PreCompact next to 6 hooks from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
PreCompactintentdriven/abcdHook4todayMITA—Claude Code
PostToolUsesupabase/supabaseHook115ktodayApache-2.0A—Claude Code
SessionStartsupabase/supabaseHook115ktodayApache-2.0A—Claude Code
SessionStartgoogle-gemini/gemini-cliHook109kyesterdayApache-2.0A—Claude Code
PreToolUseapache/supersetHook75ktodayApache-2.0A—Claude Code
PostToolUseanthropics/claude-plugins-officialHook46ktodayApache-2.0A—Claude Code
PreToolUseanthropics/claude-cookbooksHook54k3d agoMITA—Claude Code