It is for preparing or recording state before context compression.

It gives an external script a chance to act before earlier conversation details are compacted.

How PDgit12/knitbrain configures Gemini CLI

knitbrain: Hook for Gemini CLI

.gemini/settings.json

PreCompress is a hook for Gemini CLI from PDgit12/knitbrain. Its token cost is not measured, scanned A, original, MIT.

A pre-compression hook that runs the `knitbrain-hook precompact` command before the agent compresses its conversation context.

In plain words

What is it for?: It is for preparing or recording state before context compression.
Why use it?: It gives an external script a chance to act before earlier conversation details are compacted.

Written for Gemini CLI: installed under .gemini/.

This is PDgit12/knitbrain's own configuration. It tells Gemini CLI how to work on knitbrain 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 knitbrain configures →

One of 5 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 4 are separate, each on its own page.

Reuse

Borrowing it

Nothing to install: this file belongs to PDgit12/knitbrain. 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/PDgit12/knitbrain/main/.gemini/settings.json

Clone the repo

git clone --depth 1 https://github.com/PDgit12/knitbrain

Made for: Gemini CLI.

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.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/pdgit12/knitbrain/pre-compress/github.svg)](https://agentmods.dev/hooks/pdgit12/knitbrain/pre-compress)

Your own site

<a href="https://agentmods.dev/hooks/pdgit12/knitbrain/pre-compress"><img src="https://agentmods.dev/badge/hooks/pdgit12/knitbrain/pre-compress/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.

Your own site · 80×15

<a href="https://agentmods.dev/hooks/pdgit12/knitbrain/pre-compress"><img src="https://agentmods.dev/badge/hooks/pdgit12/knitbrain/pre-compress.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

PreCompress 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 14d 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.

.gemini/settings.json · 13 lines

What it actually says

{
  "PreCompress": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "knitbrain-hook precompact"
        }
      ]
    }
  ]
}

Same file

What else `settings.json` configures

This page is one entry in a file that holds 5. 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.

14d ago First seen · 13 lines scan A 00a9a3da6280

Subscribe to this mod's changes

PreCompress is a hook published in the GitHub repository PDgit12/knitbrain (6 stars, last pushed 6d 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 2026-10-23.

Claude Code Memory and context ai-agents context-compression cursor developer-tools local-first

PreCompress next to 6 hooks from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
PreCompressPDgit12/knitbrain	Hook	6	6d ago	MIT	A	—	Gemini CLI
SessionStartLians-ai/Lians	Hook	17	4d ago	Apache-2.0	A	—	Claude Code
UserPromptSubmitLians-ai/Lians	Hook	17	4d ago	Apache-2.0	A	—	Claude Code
CwdChangedsuperbasedapp/observer	Hook	56	yesterday	none	A	—	Claude Code
PostToolUsesuperbasedapp/observer	Hook	56	yesterday	none	A	—	Claude Code
PreCompactsuperbasedapp/observer	Hook	56	yesterday	none	A	—	Claude Code
SubagentStartsuperbasedapp/observer	Hook	56	yesterday	none	A	—	Claude Code