version: "1.0.0" name: factory-explain description: Explain a codebase or build plan like the listener is 10 years old - household analogies, mermaid diagrams, zero unexplained jargon. Two factory checkpoints (after planning - "here's what we're about to build"; after review - "here's how what got built actually works") plus standalone on any codebase. Explanations accumulate into factory/GUIDE.md, a plain-language owner's manual. Understanding is a first-class output of the factory, not a byproduct. Triggers - "explain like I'm 10", "how does this codebase work", "what did we just build", "factory explain".

Factory Explain

Giving the user real understanding is what separates owning your software from renting it from an AI. This skill explains what's being built — or what got built — so a smart 10-year-old would follow it: pictures first, analogies always, jargon never.

Three modes:

• Pre-build (factory stage 3→4): explain the plan — what we're about to

build and how the pieces will fit. The cheapest moment to catch "wait, that's not what I meant."

• Post-build (after factory-review): explain what actually got built —

how it works now that it's real, including anything that changed from plan.

• Standalone: point at any codebase or folder — "explain this like I'm

10" — no factory state needed.

Rules of explanation

1. Analogy before mechanism. Every component maps to something from

ordinary life — the database is a filing cabinet, the API is a waiter carrying orders to the kitchen, the queue is a take-a-number machine at the deli. Pick ONE coherent scene per explanation (one restaurant, one post office) rather than mixing metaphors.

1. Picture before paragraph. Lead every section with a mermaid diagram;

prose explains the picture, not the other way around.

1. Zero unexplained jargon. Every technical term gets defined in the same

sentence, in parentheses, or doesn't appear.

1. Follow one thing through the system. The spine of the explanation is a

story: "here is what happens, step by step, when you click Save" — from the click to the stored data and back to the screen.

1. Honest, not dumbed down. Simplify the language, never the truth. If

something is fragile or was parked, the explanation says so plainly.

1. End with "what you can now say." Three sentences the user could

repeat to a technical person that would be accurate — that's the test of whether understanding transferred.

Structure of one explanation

## <Title: "What we're about to build" | "How <project> works">
### The whole thing in one picture
<mermaid flowchart: 5-9 boxes MAX, plain-language labels — "Saves your
items", never "ItemService". More boxes = zoom out further.>
### The cast of characters
<each box: what it does, its analogy, where it lives (folder/file)>
### Follow one click through the system
<the sequence story — mermaid sequenceDiagram if it earns it>
### The parts most likely to confuse you
<2-3 honest gotchas in plain language>
### What you can now say
<the three accurate sentences>

Diagram hygiene: quote node labels, keep them under ~6 words, direction top-down for structure and left-right for flows. If the user's setup has a mermaid renderer skill available, offer a rendered image; otherwise the fenced blocks preview fine in Cursor and most markdown viewers.

Accumulate into factory/GUIDE.md

In factory modes, every explanation is appended to factory/GUIDE.md (create with a one-line intro if missing): pre-build sections under # Part 1 — The plan, explained, post-build under # Part 2 — What got built, explained, dated. Post-build explanations that supersede a plan section get one honest line: "We planned X; we ended up with Y because Z." Over time GUIDE.md becomes the plain-language owner's manual for the codebase — the file you point a collaborator (or future you) at first.

Interactive close

End every explanation with: "Which part should I zoom into?" — then explain that part one level deeper, same rules, same analogy scene. Depth on demand beats length by default.

In factory mode, update STATE.md's notes line ("plan explained to user <date>" / "build explained <date>") — the conductor uses it to avoid re-offering what's already been done. If factory/STATE.md doesn't exist (standalone use), create it first with a minimal version of the schema described in factory/SKILL.md.