PreCompact

Pre-compaction hooks that save the conversation and workflow state before the coding agent's context is shortened, while pruning older logs.

In plain words
What is it for?
Use them to save a readable transcript, restore-point state, and a manageable set of logs before compaction.
Why use it?
Context shortening can make an agent forget earlier decisions; these hooks preserve information needed to resume work.

Hook for Claude Code

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.

agentmods
npx agentmods add hooks/azalio/map-framework/pre-compact
Clone the repo
git clone --depth 1 https://github.com/azalio/map-framework

Made for: Claude Code.

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. Scan, not verified.
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 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.

.claude/settings.json · 28 lines

What it actually says

{
  "PreCompact": [
    {
      "matcher": "*",
      "description": "Anti-Amnesia Hook - save state and prune logs before compaction",
      "hooks": [
        {
          "type": "command",
          "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/ralph-context-pruner.py",
          "timeout": 10,
          "description": "Saves workflow restore point and prunes old logs"
        }
      ]
    },
    {
      "matcher": "*",
      "description": "Transcript Saver - save full conversation to .map/ before compaction",
      "hooks": [
        {
          "type": "command",
          "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/pre-compact-save-transcript.py",
          "timeout": 30,
          "description": "Saves full transcript as readable markdown to .map/<branch>/transcript-YYYY-MM-DD-HH-MM.md"
        }
      ]
    }
  ]
}
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 · 28 lines scan A feedd8a315ab

Subscribe to this mod's changes

PreCompact is a hook published in the GitHub repository azalio/map-framework (153 stars, last pushed 3d 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.