# Authoring modes and lazy projection fields

| Field | Value |
|-------|--------|
| Date | 2026-08-13 |
| Status | design proposal (product + data model) |
| Related | page-first model, Abstractor/Title/Visual, stage-1 cut, markitect structure |

## Intent

Coulomb should make **both** styles of knowledge work feel natural:

| Mode | Flow |
|------|------|
| **Top-down** | Title → short description (abstractor) → outline → elaborate body → optional visual |
| **Bottom-up** | Plunge into body text → title / abstractor / structure / visual emerge after or while writing |

Neither mode may force the other. Empty or content-only entities must still **display** as first-class cards (title, description, illustration) without blocking the writer.

## Principles

1. **Body is never blocked** on metadata. A page with only prose is valid.
2. **Display needs projections** — card/list UI needs title, abstractor, visual when showing an entity.
3. **Projections may start virtual** — generated on first need (lazy), then **persisted as normal field values**.
4. **After persistence, fields behave like user-authored data** — editable, exportable in frontmatter, same SoR as hand-written values.
5. **Regenerate** is an explicit action, not ambient rewriting.
6. **Lock** freezes a field against automatic (and optionally against bulk) regeneration.
7. **Structure stays page-first** — outline is headings/sections in the markdown body (or a derived outline view), not a separate chunk ontology. See `transclusion-and-chunks.md`.

---

## Field set (stage-1 aligned)

| Field | Role | Display use |
|-------|------|-------------|
| **title** | Name of the entity | Card headline, browser title, lists |
| **abstractor** | Short description (Bubble: Abstractor) | Card subtitle, previews, search snippet |
| **visual** | Illustration / cover | Card face, headers |
| **body** | Main markdown content | Full page view |
| **outline** | Derived (usually) from body headings | Top-down scaffold; navigation |

`outline` is typically **not** a separate SoR blob: it is **read from** `#` / `##` structure, or optionally written back as a stub section when the user accepts a generated outline in top-down mode.

---

## Dual mode UX

### Top-down path

```text
New page
  → focus title (optional visual placeholder)
  → abstractor
  → "Generate outline" → body becomes heading skeleton
  → user elaborates under headings
  → visual optional (upload or generate)
```

- Empty body with title/abstractor is fine.
- Outline generation **writes body** (or a dedicated outline region) only when the user asks — not on every keystroke.

### Bottom-up path

```text
New page / open blank body
  → write freely
  → on first card/list display (or idle debounce): lazy-fill missing title/abstractor/visual
  → user may edit, regenerate, or lock any field
  → optional "Propose outline" restructures headings without deleting prose carelessly
```

- Creating a page must not require a title dialog.
- Autosave body continuously; projections fill **lazily on display need** or on explicit "Suggest metadata".

### Mode switching

There is **no mode toggle the user must set**. The product infers intent:

- If title/abstractor present and body empty → treat as top-down.
- If body present and title empty → bottom-up; lazy projections allowed.
- Both filled → normal edit; regenerate only on demand.

---

## Lazy projections (virtual → real)

### Lifecycle of a projection field

```text
missing
  → (display needs field) generate candidate  [virtual / ephemeral]
  → persist to page frontmatter               [real]
  → user edit | regenerate | lock
```

| State | Meaning |
|-------|---------|
| **absent** | No value in SoR; may generate |
| **derived** | Value present; `provenance: generated` (or equivalent); unlocked |
| **user** | Value present; last material edit was human (or import); unlocked |
| **locked** | Value fixed; no auto/lazy regenerate; explicit unlock required |

**Rule:** Once generated and saved, the value is **kept** as if the user had typed it — cards and export see real frontmatter, not a live prompt every time.

**Lazy trigger examples:**

- First render of a card in a list/deck when `title` or `abstractor` or `visual` is absent  
- Opening page header chrome when fields missing  
- Explicit “Fill missing metadata”  

**Not triggers (by default):**

- Every keystroke in the body  
- Background jobs that rewrite locked or recently user-edited fields  
- Silent overwrites of `user` or `locked` values  

### Generation sources (implementation-agnostic)

| Field | Cheap deterministic options | Richer options (optional) |
|-------|----------------------------|---------------------------|
| title | First H1, first non-empty line, filename/slug | LLM short title from body |
| abstractor | First paragraph, first section under H1 | LLM 1–2 sentence summary |
| visual | Palette placeholder from hash of id; first image in body/assets | Image model / pick from assets |
| outline | Existing headings; or insert H2 stubs from summary | LLM outline from abstractor or body |

Prefer **deterministic first** for offline/dev and predictable tests; LLM behind the same regenerate/lock contract.

### Persist shape (illustrative frontmatter)

```yaml
---
id: page-…
title: "Working title"
abstractor: "One-line sense of the page."
visual: "assets/visuals/page-….webp"   # or sha256:… asset ref
projections:
  title:
    state: derived          # absent | derived | user | locked
    locked: false
    generated_at: "2026-08-13T12:00:00Z"
    generator: "first-h1@v1"
    source_hash: "sha256:…" # body hash when generated — optional staleness hint
  abstractor:
    state: user
    locked: false
  visual:
    state: locked
    locked: true
    generated_at: "2026-08-13T11:00:00Z"
    generator: "placeholder-hash@v1"
---

Body markdown…
```

Notes:

- **Display values** live in top-level `title` / `abstractor` / `visual` so export and non-coulomb tools still see normal fields.
- **`projections.*`** holds lifecycle only (state, lock, generator, hashes) — not a second title.
- If `projections` is missing (imported Bubble/markdown), treat present fields as `user` unlocked; absent fields as `absent`.

### Actions on each field

| Action | Behavior |
|--------|----------|
| **Edit** | Set value; set state → `user`; clear stale generator metadata or keep last generator for audit |
| **Regenerate / Update** | Allowed if not locked; re-run generator; overwrite value; state → `derived`; refresh `generated_at` / `source_hash` |
| **Lock** | `locked: true`, state → `locked`; blocks regenerate and lazy auto-fill |
| **Unlock** | `locked: false`; state → `user` or `derived` (keep last provenance) |

UI: per-field overflow (✎ edit · ↻ regenerate · 🔒 lock) on cards and page chrome — unobtrusive, always available.

### Staleness (optional, unlocked derived only)

If `source_hash` ≠ current body hash, UI may show “metadata may be outdated” and offer regenerate — **never** auto-regenerate locked or `user` fields without consent. Policy for `derived` + stale can be: badge only (default) or auto-refresh if product later opts in.

---

## Interaction with page-first / transclusion

- **Outline** = structure of **this** page’s body (headings), not a chunk table.
- Top-down “generate outline” writes headings into body; elaboration is normal writing under those headings.
- Bottom-up “propose outline” may reorganize into headings (explicit action; preview/diff recommended).
- A card for a **transcluded excerpt** uses the **source page’s** projections unless the excerpt is promoted to its own page.

---

## Capability / feature mapping (rebuild)

Under `cap.space-content` (and any entity shown as a card):

| Feature id (proposed) | Description |
|----------------------|-------------|
| `feat.authoring-top-down` | Title/abstractor/outline-first create path |
| `feat.authoring-bottom-up` | Body-first create; no required metadata gate |
| `feat.projection-lazy-fill` | Lazy generate missing title/abstractor/visual on display |
| `feat.projection-persist` | Persist generated values into frontmatter |
| `feat.projection-regenerate` | Explicit per-field regenerate |
| `feat.projection-lock` | Per-field lock against auto/regenerate |

Stage-1: ship dual authoring + lazy title/abstractor at minimum; visual generation can start as placeholder art; LLM optional.

---

## Anti-patterns

| Avoid | Why |
|-------|-----|
| Requiring title before first save | Blocks bottom-up |
| Regenerating on every body keystroke | Noisy, fights the writer |
| Virtual-only fields that never save | Breaks export and “user’s data” |
| One global “AI mode” toggle for the whole page | Prefer per-field lock/regenerate |
| Separate chunk entities only to hold outline | Outline is page structure |

---

## Open product choices

1. **Default generator set** — deterministic only vs LLM when configured.  
2. **Stale derived fields** — badge-only vs optional auto-refresh.  
3. **Visual generation** — placeholder vs asset pipeline vs external image model.  
4. **Outline write-back** — always mutate body vs ephemeral outline panel until “Apply”.  
5. **Space-level projections** — same contract for space cards (title/abstractor/visual).

---

## One-liner

**Top-down and bottom-up are both first-class; display fields can be born lazy, then live as ordinary locked-or-editable metadata so tooling never blocks the writing.**

## Related

- `docs/architecture/transclusion-and-chunks.md`
- `docs/architecture/ArchitectureBlueprint.md`
- `docs/capability/stage-1-cutover.md`
- `docs/capability/existing-bubble-capability-map.md` (Title, Abstractor, Visual)