Knowledge

Knowledge Skill

Purpose

Store and retrieve verified facts and operational tips discovered through project work. Knowledge pages (K-pages) capture "what we learned" in a retrievable format distinct from CLAUDE.md rules (which are behavioral countermeasures) and D/P/T/I documents (which track work in progress).

Anti-Rule-Duplication Guard

Before creating a K-page, check if the "What" content overlaps with CLAUDE.md RULES keywords: scope, verification, understanding, concise, sycophancy, pressure, guard, hook, bailout, prohibited.

If overlap found, warn:

"This sounds like a behavioral rule. Rules belong in CLAUDE.md, not knowledge/."

Ask user to confirm before proceeding. Facts about how tools behave (e.g., "Bash rm triggers permission prompts for .claude/ paths") belong in knowledge/. Rules about how Claude must behave belong in CLAUDE.md.

Mode A: Create Mode — /knowledge "title"

Step 1: Ensure Infrastructure

Check if .crabshell/knowledge/ exists. If not, create it. Check if .crabshell/knowledge/INDEX.md exists. If not, create it with header:

# Knowledge Index

| ID | Title | Cat | Tags | Source |
|----|-------|-----|------|--------|

Step 2: Determine Next K{NNN} ID

Scan .crabshell/knowledge/K*.md filenames. Find the highest existing number. Next ID = that number + 1, zero-padded to 3 digits. If no K-pages exist, start at K001.

Step 3: Gather Content from User

Ask the user for the following (or infer from context if the invocation includes enough detail):

1. category: fact (a verified observation about how something behaves) or tip (an operational best practice)
2. What: 1-3 sentences describing the fact or tip. Be specific and concrete.
3. When: When is this knowledge relevant? (e.g., "when writing hooks that touch .claude/ paths", "when choosing keywords for CLI user input")
4. source: Which document or observation is this from? (e.g., I047, lesson, observation)
5. tags: 2-4 lowercase tags (e.g., [cli, bash, permissions])

Step 4: Create K-Page

Write .crabshell/knowledge/{K-ID}-{slug}.md where slug is lowercase-hyphenated title:

---
type: knowledge
id: {K-ID}
category: fact | tip
title: "{title}"
source: {source}
created: {YYYY-MM-DD}
tags: [{tag1}, {tag2}]
---

# {K-ID} - {title}

## What
{1-3 sentences: the fact or tip, concrete and specific}

## When
{when this knowledge is relevant to apply or recall}

Step 5: Update INDEX.md

Append a new row to .crabshell/knowledge/INDEX.md:

| {K-ID} | {title} | {cat} | {tags} | {source} |

Mode B: View Mode — /knowledge K001

Step 1: Read K-Page

Read .crabshell/knowledge/K{NNN}-*.md matching the given ID. Display full content.

If the ID does not exist, list all available K-page IDs from INDEX.md.

Notes

• K-pages are append-only records. Do not edit existing K-pages; create a new one if the fact has changed.
• K-pages are stored under .crabshell/ (gitignored, local only).
• search-docs.js indexes .crabshell/knowledge/ — K-pages are searchable via /crabshell:search-docs.