---
title: "3DARCH-FT-21 — Exchange floor-scoped text conversation"
description: "Enable participants on the same floor to send and receive named, timestamped messages and see recent speech represented above the sender's avatar."
---

# Exchange floor-scoped text conversation

| Feature | Parent Epic | Delivery status | Status source | Owner | Approved for Solution |
|---|---|---|---|---|---|
| `3DARCH-FT-21` | [3DARCH-EP-5 — Communicate in Spatial Context](../../3darch-ep-5.md) | `IN_BACKLOG` | `EXACT` | 3D Architecture Wizzard team | No |

## Description

Enable participants on the same floor to send and receive named, timestamped messages and see recent speech represented above the sender's avatar.

## User or operator problem

Colocated participants need a quick written conversation channel that preserves the current floor context.

## Expected value

Keeps lightweight written communication inside the participant’s immediate spatial context.

## Scope

Includes opening/collapsing chat, non-empty submission, floor-scoped relay, sender/time display, scrolling, and temporary avatar speech bubbles.

### Exclusions

- Direct messaging, persistence, history, recording, transcription, and cross-floor communication are excluded.

## Acceptance outcomes

- [ ] The chat panel can be opened, collapsed, composed in, and scrolled.
- [ ] A sent message is relayed only to the sender's current floor.
- [ ] Messages identify the sender and time.
- [ ] A temporary speech bubble and speaking/talking state connect the message to the in-world avatar.
- [ ] Changing floors cannot present previous-floor chat as current-floor conversation.

## Dependencies

- [3DARCH-FT-18 — See who shares the current floor](../../3darch-ep-4/features/3darch-ft-18.md)
- [3DARCH-FT-19 — Recognize coworkers by workplace identity](../../3darch-ep-4/features/3darch-ft-19.md)

## Risks

- Chat is ephemeral and the legacy client can retain previous-floor messages after a floor change.

## 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-21/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/nebula/src/components/Chat/Chat.tsx`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/components/Chat/Chat.tsx)
- [`apps/nebula/src/components/SpeechBubble.tsx`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/components/SpeechBubble.tsx)
- [`apps/nebula/src/stores/chatStore.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/stores/chatStore.ts)
- [`apps/singularity/src/socket-server/chat-handler.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/singularity/src/socket-server/chat-handler.ts)