Breakdown

/breakdown — the multi-altitude explainer

Turn a body of work into an explanation that a non-technical person and an engineer both find illuminating — and that is good enough to become seed documentation for a repo.

This skill exists because: we often build something powerful that took a long, winding path to figure out, and then the wisdom of HOW and WHY evaporates. This captures it while it's fresh, in a shape that's legible, attractive, and reusable.

Step 0 — Identify the subject + mine the prompt

Bare invocation (/breakdown with no args) — assume, don't ask. Default to:

• Audience = Lucas, the owner (smart, non-academic; plain language first, depth on demand).
• Heavy ASCII throughout — this is the house style for breakdowns.
• Subject = the substantive work done in the current session.
• Skip the prompt-coaching (Step 0.2's "improved variant") — don't append it to a normal breakdown.

Only deviate when the user names a different target, audience, or passes a flag. Never stall on a clarifying question — state any assumption in one line and proceed.

1. Subject. Default = the substantive work done in the current session. If the user names a target (a repo, a feature, a PR, a commit range, a file), use that instead. If ambiguous, state your assumption in one line and proceed (don't stall on a question).
2. Mine the originating prompt (OPTIONAL — off by default). Only when the user explicitly asks "how should I have asked?" or passes a +prompt flag: find the originating message, quote it, and write one improved variant. Otherwise skip this step entirely — the bare /breakdown should not lecture the user on how to prompt.

Step 1 — Lead with the one-sentence version

The first thing on screen is a single bolded sentence a layperson understands. No jargon. A metaphor is good. This is non-negotiable and goes first.

Step 2 — Descend the altitudes (lay-person BEFORE technical)

Produce four altitude sections, in this order, each headed by its altitude:

• 100,000 ft — for a non-technical person. The point, in plain language, with a vivid analogy. Why a normal person would care. Use an ASCII before/after or simple diagram here — concrete beats abstract.
• 50,000 ft — strategic. Where this fits in the bigger goal. What problem-class it solves. Any rollout/sequence/roadmap framing.
• 30,000 ft — the technical shape (C4 diagrams). ASCII C4: a Context diagram (who/what uses it), a Container diagram (the systems/repos involved + status), and at least one before→after of the core idea. Label clearly.
• 10,000 ft — the engineering. A Component (C3) ASCII diagram of the internals, plus the concrete decisions/bugs/tradeoffs. A small table of "issue found → why it mattered → fix" is ideal when there was a review process.

Rules for the altitudes:

• ASCII art only, never images. Monospace box-drawing. Keep diagrams under ~70 cols so they render in a terminal.
• Each altitude must be readable on its own; someone can stop at any level and have gotten value.
• Brief ≠ shallow. Depth is welcome here; this is the one place where long-form is correct. (Match length to the complexity of the work.)

Step 3 — Where it sits (the architecture placement)

Place the work inside the system's existing structure. Read and cite:

• `` (the registry of reusable primitives) — which primitive is this, or does it create a new one?
• `` (the 8-layer north-star) — which layer(s) does it touch?

Show an ASCII placement (the relevant tier/layer slice with this work highlighted). Then state how it relates to the adjacent primitives (what it depends on, what depends on it, what it composes with).

Step 4 — The seed backstory (the "why it's whole and attractive" facets)

These eight facets make the explanation feel complete and make it directly reusable as a repo README. Cover each in 1-3 tight sentences:

1. Ultimate solve — not the mechanism, the end state it buys. ("Make the past queryable and trustworthy so the present can be built on without fear," not "it logs changes.")
2. Why it matters — the cost of NOT having it.
3. Downstream effects — what it unlocks elsewhere (autonomy, sellability, compounding, etc.).
4. Best use cases — where to reach for it; where NOT to.
5. How we learned it — the path: the research, the failures, the process that hardened it.
6. What inspired it — the intellectual lineage / prior art (name names).
7. Source material — specific docs, memos, transcribed videos, corpora used. If exact titles aren't to hand, name the corpus + how to pull them, and add a runbook TODO rather than inventing titles.
8. Historical evolution — how the idea evolved from inspiration → first instance → hardened standard.

Step 5 — Honest gaps

A short, plain list of what is NOT done / NOT in scope / known follow-ups. Never let the explainer read as "everything is perfect." If there are deferred items, name them and why they were deferred. Cross-check against `` so no claim drifts from known reality.

Step 6 — Offer to crystallize

End by offering (one line, not a paragraph) to save the explanation as: a repo README / a seed doc / a HOUSE-STANDARDS.md entry / a wiki synthesis node. Don't auto-write unless the work clearly warrants a durable home and the user's pattern is "just do it."

Quality bar (the taste this skill enforces)

• One-sentence version first. Always.
• Lay-person framing before any technical content.
• ASCII C4, not prose-only and not images.
• Cite file:line and commit SHAs for anything concrete — receipts, not assertions.
• Name the prior art and the source material — intellectual honesty is part of why it feels trustworthy.
• Surface gaps. A breakdown that hides what's unfinished is propaganda, not documentation.

Composition

• Invoke standalone anytime ("break this down", "/breakdown").
• As a pp2p coda: after a perfection pass converges, run /breakdown on the hardened work so every major change ships with its own multi-altitude explanation. (This is the recommended default for substantial features.)

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Lucface
• Source: Lucface/claude-skills
• License: MIT

Install and usage instructions live in the source repository linked above.