PreCompact

PreCompact is a hook for Claude Code from Soulcynics404/AgentForge. Its token cost is not measured, scanned A, a copy of PreCompact, MIT.

A pre-compaction hook that prints reminders before an agent's conversation context is shortened. It supports both manual and automatic compaction.

In plain words
What is it for?
It reminds the agent to review project instructions, available agents, coordination methods, and any custom compaction notes.
Why use it?
It helps preserve important project instructions and coordination guidance when the available conversation history is reduced.

Hook for Claude Code

Written for Claude Code: PreCompact hook event. Also seen: reads .claude/ paths; mentions CLAUDE.md.

Part of the claude-flow plugin — 134 skills, 52 commands, 11 agents, 4 hooks, 1 MCP server shipped together

One of 4 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 3 are separate, each on its own page.

Good fit It reminds the agent to review project instructions, available agents, coordination methods, and any custom compaction notes.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/soulcynics404/agentforge/pre-compact
Install

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.

Clone the repo
git clone --depth 1 https://github.com/Soulcynics404/AgentForge

Made for: Claude Code.

Or install claude-flow, the plugin that ships this one along with the rest of its 134 skills, 52 commands, 11 agents, 4 hooks, 1 MCP server.

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/soulcynics404/agentforge/pre-compact/github.svg)](https://agentmods.dev/hooks/soulcynics404/agentforge/pre-compact)
Your own site
<a href="https://agentmods.dev/hooks/soulcynics404/agentforge/pre-compact"><img src="https://agentmods.dev/badge/hooks/soulcynics404/agentforge/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/soulcynics404/agentforge/pre-compact"><img src="https://agentmods.dev/badge/hooks/soulcynics404/agentforge/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 100% 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 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.

Origin

This is a copy

100% identical to PreCompact — 0 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-plugin/hooks/hooks.json · 22 lines

What it actually says

{
  "PreCompact": [
    {
      "matcher": "manual",
      "hooks": [
        {
          "type": "command",
          "command": "/bin/bash -c 'INPUT=$(cat); CUSTOM=$(echo \"$INPUT\" | jq -r \".custom_instructions // \\\"\\\"\"); echo \"🔄 PreCompact Guidance:\"; echo \"📋 IMPORTANT: Review CLAUDE.md in project root for:\"; echo \"   • 54 available agents and concurrent usage patterns\"; echo \"   • Swarm coordination strategies (hierarchical, mesh, adaptive)\"; echo \"   • SPARC methodology workflows with batchtools optimization\"; echo \"   • Critical concurrent execution rules (GOLDEN RULE: 1 MESSAGE = ALL OPERATIONS)\"; if [ -n \"$CUSTOM\" ]; then echo \"🎯 Custom compact instructions: $CUSTOM\"; fi; echo \"✅ Ready for compact operation\"'"
        }
      ]
    },
    {
      "matcher": "auto",
      "hooks": [
        {
          "type": "command",
          "command": "/bin/bash -c 'echo \"🔄 Auto-Compact Guidance (Context Window Full):\"; echo \"📋 CRITICAL: Before compacting, ensure you understand:\"; echo \"   • All 54 agents available in .claude/agents/ directory\"; echo \"   • Concurrent execution patterns from CLAUDE.md\"; echo \"   • Batchtools optimization for 300% performance gains\"; echo \"   • Swarm coordination strategies for complex tasks\"; echo \"⚡ Apply GOLDEN RULE: Always batch operations in single messages\"; echo \"✅ Auto-compact proceeding with full agent context\"'"
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 4. 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 First seen · 22 lines scan A b5c120219ac0

Subscribe to this mod's changes

PreCompact is a hook published in the GitHub repository Soulcynics404/AgentForge (1 stars, last pushed 1mo 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. It is 100% identical to PreCompact, differing in 0 lines, and is treated as a copy.