Two shell commands that run after an AI agent’s conversation context has been shortened to make room for more work. They call scripts from the Writ project.

Use it to trigger Writ’s black-box capture and post-compaction processing after context compaction.

They preserve or process information around context shortening, when earlier conversation details may otherwise be harder to recover.

PostCompact — Hook by infinri

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/infinri/writ/post-compact

Clone the repo

git clone --depth 1 https://github.com/infinri/Writ

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 58% copy Near-identical to another mod in the catalogue.

Security

Grade A, and why

PostCompact 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 2d 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

58% identical to SessionStart — 17 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.

hooks/hooks.json · 22 lines

What it actually says

{
  "PostCompact": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/writ-blackbox-capture.sh"
        }
      ]
    },
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/writ-postcompact.sh"
        }
      ]
    }
  ]
}

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.

2d ago First seen · 22 lines scan A ac71468d16d1

Subscribe to this mod's changes

PostCompact is a hook published in the GitHub repository infinri/Writ (189 stars, last pushed 17d 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 58% identical to SessionStart, differing in 17 lines, and is treated as a copy.

Languages Research agent-tools ai-coding claude-code knowledge-graph python rule-enforcement

PostCompact

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

Stop

PostToolUse

PreToolUse

SessionStart

PreCompact

UserPromptSubmit