---
title: "3DARCH-FT-30 — Apply and persist a natural-language design change"
description: "Enable a person to describe a focused change to a generated or reopened apartment, review the updated 3D result, and find that result retained when the project is reopened."
---

# Apply and persist a natural-language design change

| Feature | Parent Epic | Delivery status | Status source | Owner | Approved for Solution |
|---|---|---|---|---|---|
| `3DARCH-FT-30` | [3DARCH-EP-9 — Refine a Design Through Natural-Language Changes](../../3darch-ep-9.md) | `IN_BACKLOG` | `EXACT` | 3D Architecture Wizzard team | No |

## Description

Enable a person to describe a focused change to a generated or reopened apartment, review the updated 3D result, and find that result retained when the project is reopened.

## User or operator problem

A person needs to refine an existing apartment through a focused request without regenerating a separate project.

## Expected value

Preserves project continuity while allowing the current design to evolve from natural-language intent.

## Scope

Includes bounded natural-language input, update of the current persisted project, last-valid-scene protection, visible result, and drift review.

### Exclusions

- Version history, undo, deterministic diffs, and fast-edit guarantees are excluded.

## Acceptance outcomes

- [ ] Editing is available only after a project has a persisted identity and scene.
- [ ] A bounded natural-language request updates the intended design content while preserving project identity and unaffected content.
- [ ] Invalid or failed edits leave the last valid scene intact and explain the failure.
- [ ] The updated scene appears in the current viewer and persists for later reopening.
- [ ] The user can distinguish the requested change from unintended model drift before accepting it as the current version.

## Dependencies

- [3DARCH-FT-26 — Generate a complete apartment concept from a natural-language brief](../../3darch-ep-7/features/3darch-ft-26.md)
- [3DARCH-FT-28 — Inspect the apartment from an overview](../../3darch-ep-8/features/3darch-ft-28.md)

## Risks

- Editing rewrites the complete scene without a diff, version history, undo, or deterministic preservation guarantees.

## Human approval

Linas approved this Feature for documentation on 2026-09-02T10:40:43.220Z. It is **not Approved for Solution** and has no implementation approval.

- [Documentation decision](https://discord.com/channels/1518726359512387766/1543925247361814568/1544658325738885201)

## Delivery status evidence

The Feature was separately registered at `IN_BACKLOG` as an accepted catalogue boundary. This records backlog retention, not design or delivery progress.

- Event: Catalogue registration
- Actor and authority: Linas — Human project team member
- Reason: The Feature catalogue was accepted for governed documentation and retained in the backlog.
- [Status evidence](https://discord.com/channels/1518726359512387766/1543925247361814568/1544658325738885201)

## Architecture traceability

- Requirements: none derived.
- Readiness: Not started.

Architecture solution work must not begin until a separate human **Approved for Solution** decision is recorded.

## Tasks

[Review the Tasks group](./3darch-ft-30/tasks.md). No canonical implementation Tasks have been defined.

## Original source

- [Discord – Scope – Linas: original Feature request](https://discord.com/channels/1518726359512387766/1543925247361814568/1544647879111483562)
- [Discord – Scope – Linas: proceed with documented mapping](https://discord.com/channels/1518726359512387766/1543925247361814568/1544658325738885201)

### Legacy implementation evidence

The Feature boundary was mined from legacy revision `c0ced47ecaf4426f47e5c2e4868677f7144b951a`.

- [`apps/archwiz-portal/src/components/RightSidebar.tsx`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/archwiz-portal/src/components/RightSidebar.tsx)
- [`apps/archwiz-portal/src/api/client.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/archwiz-portal/src/api/client.ts)
- [`apps/archwiz-forge/src/routes/edit.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/archwiz-forge/src/routes/edit.ts)
- [`apps/archwiz-forge/src/pipeline/edit.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/archwiz-forge/src/pipeline/edit.ts)
- [`apps/archwiz-forge/src/skills/edit-scene.md`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/archwiz-forge/src/skills/edit-scene.md)