# Reduce

Extract structured knowledge from source material.

- Repository: https://github.com/agenticnotetaking/arscontexta (3518 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-02-24
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add agenticnotetaking/arscontexta --skill reduce -g -a claude-code -y`
Codex: `npx skills add agenticnotetaking/arscontexta --skill reduce -g -a codex -y`
Cursor: `npx skills add agenticnotetaking/arscontexta --skill reduce -g -a cursor -y`
Gemini CLI: `npx skills add agenticnotetaking/arscontexta --skill reduce -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add agenticnotetaking/arscontexta`

## Description

Extract structured knowledge from source material. Comprehensive extraction is the default, every insight that serves the domain gets extracted. For domain-relevant sources, skip rate must be below 10%. Zero extraction from a domain-relevant source is a BUG. Triggers on "/reduce", "/reduce [file]", "extract insights", "mine this", "process this".

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

## Runtime Configuration (Step 0, before any processing)

Read these files to configure domain-specific behavior:

1. **`ops/derivation-manifest.md`**, vocabulary mapping, extraction categories, platform hints
   - Use `vocabulary.notes` for the notes folder name
   - Use `vocabulary.inbox` for the inbox folder name
   - Use `vocabulary.note` for the note type name in output
   - Use `vocabulary.note_plural` for the plural form
   - Use `vocabulary.reduce` for the process verb in output
   - Use `vocabulary.cmd_reflect` for the next-phase command name
   - Use `vocabulary.cmd_reweave` for the backward-pass command name
   - Use `vocabulary.cmd_verify` for the verification command name
   - Use `vocabulary.extraction_categories` for domain-specific extraction table
   - Use `vocabulary.topic_map` for MOC/topic map references
   - Use `vocabulary.topic_maps` for plural form

2. **`ops/config.yaml`**, processing depth, pipeline chaining, selectivity
   - `processing.depth`: deep | standard | quick
   - `processing.chaining`: manual | suggested | automatic
   - `processing.extraction.selectivity`: strict | moderate | permissive

3. **`ops/queue/queue.json`**, current task queue (for handoff mode)

If these files don't exist (pre-init invocation or standalone use), use universal defaults:
- depth: standard
- chaining: suggested
- selectivity: moderate
- notes folder: `notes/`
- inbox folder: `inbox/`

---

## THE MISSION (READ THIS OR YOU WILL FAIL)

You are the extraction engine. Raw source material enters. Structured, atomic {vocabulary.note_plural} exit. Everything between is your judgment, and that judgment must err toward extraction, not rejection.

### The Core Distinction

The rest: https://github.com/agenticnotetaking/arscontexta/blob/HEAD/skill-sources/reduce/SKILL.md