Gap Last Don't invent a cause until you can name the gap.

Run the skill

The skill is a folder you give an agent so it keeps the Gap Last method. Get the folder into a skills directory, then ask it to reconstruct. The CLI in this repo checks a reconstruction file. It does not invent a cause.

Filling a file by hand is the template. That is writing the reconstruction, not installing the skill.

Download the ZIP

Download gaplast.zip

Unpack it. Move the gaplast folder (the one that contains SKILL.md) into a skills directory.

On claude.ai, skip unpacking. Upload the ZIP under Settings, Customize, Skills.

Clone the repo

git clone https://github.com/Catalyst-Forge-LLC/gap-last.git

Copy skills/gaplast/ from the clone into a skills directory.

Install from npm

The ZIP or the clone is the way to get the skill today. After a real publish:

pnpm add -D gaplast

Copy node_modules/gaplast/skills/gaplast/ into a skills directory.

Skills directories

  • Claude Code, every project: ~/.claude/skills/gaplast/
  • Claude Code, one repo: .claude/skills/gaplast/
  • Cursor: .cursor/skills/gaplast/ or ~/.cursor/skills/gaplast/

The folder you drop in must be named gaplast and must contain SKILL.md.

What you say

  • Run Gap Last on this claim.
  • /full on this packet.
  • /bound only. Do not invent a cause.
  • /reopen with this new trace.
  • Who caused it? (The skill reconstructs first.)

What it does not run on

A proof you can actually write. A controlled experiment you can actually run. A statistics problem whose bottleneck is sampling. Time-limited action against an opponent. That last one is OODA's job. Say so and stop.

CLI

From a clone of this repo:

pnpm install
pnpm gaplast validate path/to/reconstruction.json
pnpm gaplast path/to/reconstruction.json

A raw packet that is not a reconstruction gets a thin open bound and no hypotheses. No cause is invented.