feat: let people delete their messages and react to messages

.lane/memory/apps/app/src/transcript.ts/01M4YQRMMB6JT09W33MJMPKSMF-a-re-watch-keeps-showing-the.md

@@ -4,9 +4,9 @@ anchor: function useTranscript
 created: 2026-10-15T02:55:20Z
 norm: '1'
 sig: 3961cde46070e655
-body_hash: 6b86dda9a0611495
-raw_hash: 510d0884aeb13f05
-vouched: 2026-10-15T04:57:12Z
+body_hash: cd0b6429068face3
+raw_hash: 9d8f485b8e977dab
+vouched: 2026-10-16T22:08:16Z
 lines: 174-275
 ---
 

.lane/memory/apps/app/src/transcript.ts/01M4YYQEXJX6JQ04TBRZ4DW1X8-a-watch-rejected-with-discon.md

@@ -4,8 +4,9 @@ anchor: function useTranscript
 created: 2026-10-15T04:57:01Z
 norm: '1'
 sig: 3961cde46070e655
-body_hash: 6b86dda9a0611495
-raw_hash: 510d0884aeb13f05
+body_hash: cd0b6429068face3
+raw_hash: 9d8f485b8e977dab
+vouched: 2026-10-16T22:08:16Z
 lines: 197-314
 ---
 

.lane/memory/apps/host/src/worker.ts/01M4YQXGS3RQSHX8N6GH99R7D4-the-directory-s-self-name-st.md

@@ -4,9 +4,9 @@ anchor: '@file'
 created: 2026-10-15T02:58:00Z
 norm: '1'
 sig: 1a43097a4e1ad24c
-body_hash: 0b3f3d86f114b123
-raw_hash: 7ba394a2ba826e97
-vouched: 2026-10-15T03:39:53Z
+body_hash: 37c95d7886dedddc
+raw_hash: 257b1619f353fd2f
+vouched: 2026-10-16T22:08:16Z
 lines: 1-194
 ---
 

.lane/memory/packages/channel/src/channel.ts/01M4XQKND0900E94CG3BXBEJP7-a-run-s-end-is-read-from-the.md

@@ -4,9 +4,9 @@ anchor: class Channel
 created: 2026-10-14T17:33:22Z
 norm: '1'
 sig: c905677fa4be33c1
-body_hash: 26c17609650cbf0d
-raw_hash: 296267bd2e8471ba
-vouched: 2026-10-15T17:31:19Z
+body_hash: 96ca003ab550dffe
+raw_hash: 6e915715584ff7fa
+vouched: 2026-10-16T22:08:16Z
 lines: 114-792
 ---
 

.lane/memory/packages/channel/src/channel.ts/01M4YFFTK7TWGKENJAD1W10HJJ-the-desktop-default-changes.md

@@ -4,9 +4,9 @@ anchor: class Channel
 created: 2026-10-15T00:30:42Z
 norm: '1'
 sig: c905677fa4be33c1
-body_hash: 26c17609650cbf0d
-raw_hash: 296267bd2e8471ba
-vouched: 2026-10-15T17:31:19Z
+body_hash: 96ca003ab550dffe
+raw_hash: 6e915715584ff7fa
+vouched: 2026-10-16T22:08:16Z
 lines: 114-792
 ---
 

.lane/memory/packages/channel/src/channel.ts/01M4YPJQB6KKEW1YTRD08YCYJY-only-gateways-admit-clients.md

@@ -4,9 +4,9 @@ anchor: class Channel
 created: 2026-10-15T02:34:37Z
 norm: '1'
 sig: c905677fa4be33c1
-body_hash: 26c17609650cbf0d
-raw_hash: 296267bd2e8471ba
-vouched: 2026-10-15T17:31:19Z
+body_hash: 96ca003ab550dffe
+raw_hash: 6e915715584ff7fa
+vouched: 2026-10-16T22:08:16Z
 lines: 114-794
 ---
 

.lane/memory/packages/channel/src/channel.ts/01M4ZH31DXZK0Y57C97DP84ZKX-handoffs-learns-queued-hando.md

@@ -4,9 +4,9 @@ anchor: class Channel
 created: 2026-10-15T10:17:55Z
 norm: '1'
 sig: c905677fa4be33c1
-body_hash: 26c17609650cbf0d
-raw_hash: 296267bd2e8471ba
-vouched: 2026-10-15T17:31:19Z
+body_hash: 96ca003ab550dffe
+raw_hash: 6e915715584ff7fa
+vouched: 2026-10-16T22:08:16Z
 lines: 121-817
 ---
 

.lane/memory/packages/channel/src/messages.ts/01M53C4432AK0J31ABP2NSDBGY-only-a-message-s-author-dele.md

@@ -0,0 +1,12 @@
+---
+id: 01M53C4432AK0J31ABP2NSDBGY
+anchor: function remove
+created: 2026-10-16T22:08:05Z
+norm: '1'
+sig: e73f147af0f42c0d
+body_hash: 704f93bfb2eeef37
+raw_hash: b84fb0e3d822c289
+lines: 83-112
+---
+
+only a message's author deletes it, and deletion replaces it in later model context through a pi context edit, never by rewriting or removing entries

.lane/memory/packages/channel/src/messages.ts/01M53C443F8B2W36KZKW1R99PY-add-and-remove-name-the-resu.md

@@ -0,0 +1,12 @@
+---
+id: 01M53C443F8B2W36KZKW1R99PY
+anchor: function react
+created: 2026-10-16T22:08:05Z
+norm: '1'
+sig: 65d08af810f96cf1
+body_hash: a6e46e61f28dc144
+raw_hash: 9f46c79ced24f6a1
+lines: 54-80
+---
+
+add and remove name the result rather than toggling, so repeated requests are no-ops; build the list before assigning it into the document, since later mutation is lost

apps/app/src/conversation.tsx

@@ -1,9 +1,10 @@
-import { useEffect, useMemo, useSyncExternalStore } from "react";
+import { useEffect, useMemo, useState, useSyncExternalStore } from "react";
 
-import { Button, Timeline } from "@ace/ui";
+import { Button, Timeline, toast } from "@ace/ui";
 import type { Listing } from "@ace/host/protocol";
 
 import { Composer } from "./composer";
+import { DeleteMessage } from "./delete-message";
 import { desktop } from "./desktop";
 import { publish } from "./details";
 import { host } from "./host";
@@ -86,6 +87,7 @@ export function Conversation(
 				senders,
 				transcript.captions,
 				transcript.recaps,
+				transcript.reactions,
 			),
 		[
 			transcript.items,
@@ -97,8 +99,34 @@ export function Conversation(
 			senders,
 			transcript.captions,
 			transcript.recaps,
+			transcript.reactions,
 		],
 	);
+	const byKey = useMemo(
+		() => new Map(transcript.items.map((item) => [item.key, item])),
+		[transcript.items],
+	);
+	// Reactions and deletions target stored entries; the streamed draft and tool-only replies have none.
+	const actions = (uid: string) => {
+		const item = byKey.get(uid);
+		const stored = item?.entry !== undefined && !(item.kind === "message" && item.deleted);
+		// An archived channel refuses changes to its history.
+		const open = stored && channel.state !== "archived";
+		return { react: open, copy: stored && !!item.text, delete: open, permalink: false };
+	};
+	const [deleting, setDeleting] = useState<string>();
+	const act = (
+		request: { op: "react"; emoji: string; remove: boolean } | { op: "delete" },
+		uid: string,
+	) => {
+		const entry = byKey.get(uid)!.entry!;
+		host.channel(channel.id, { ...request, chat: id, author: user, entry }).catch((error: Error) =>
+			toast.error(
+				request.op === "react" ? "Could not react" : "Could not delete the message",
+				{ description: error.message },
+			)
+		);
+	};
 	// Keyed by Tailscale login for message authors and by GitHub login for mentions.
 	const avatars = useMemo(
 		() =>
@@ -146,9 +174,18 @@ export function Conversation(
 						<Timeline
 							className="h-full min-h-0 contain-paint scroll-fade [--fade:3rem]"
 							events={events}
-							toolbar={false}
 							working={transcript.busy || undefined}
-							currentUser={{ login: user }}
+							currentUser={{ login: user, own: [user] }}
+							actions={actions}
+							onReact={(uid, emoji) => {
+								const entry = byKey.get(uid)!.entry!;
+								const remove = !!transcript.reactions[entry]?.some((value) =>
+									value.from === user && value.emoji === emoji
+								);
+								act({ op: "react", emoji, remove }, uid);
+							}}
+							onCopy={(uid) => void navigator.clipboard.writeText(byKey.get(uid)!.text)}
+							onDelete={setDeleting}
 							avatars={avatars}
 							openSender={(sender) => {
 								const source = senders.get(sender);
@@ -178,6 +215,15 @@ export function Conversation(
 						</div>
 					)}
 			</div>
+			{deleting && (
+				<DeleteMessage
+					onDelete={() => {
+						act({ op: "delete" }, deleting);
+						setDeleting(undefined);
+					}}
+					onCancel={() => setDeleting(undefined)}
+				/>
+			)}
 			<div className="utils:max-width relative z-20 shrink-0 px-3 pb-3">
 				{transcript.live && (notice || transition || transcript.restarting) && (
 					<p className="pb-2 text-center text-xs text-muted-foreground" role="status">

apps/app/src/delete-message.tsx

@@ -0,0 +1,39 @@
+import {
+	Button,
+	Dialog,
+	DialogContent,
+	DialogDescription,
+	DialogFooter,
+	DialogHeader,
+	DialogTitle,
+} from "@ace/ui";
+
+type Props = {
+	onDelete: () => void;
+	onCancel: () => void;
+};
+
+/** Deleting can't be undone, and agents that already read the message keep what they read. */
+export function DeleteMessage({ onDelete, onCancel }: Props) {
+	return (
+		<Dialog open onOpenChange={(next) => next || onCancel()}>
+			<DialogContent className="gap-3 sm:max-w-80" showCloseButton={false}>
+				<DialogHeader>
+					<DialogTitle>Delete message?</DialogTitle>
+					<DialogDescription>
+						Everyone in the channel sees that it was deleted. Agents won't read it again, but runs
+						that already read it keep what they learned.
+					</DialogDescription>
+				</DialogHeader>
+				<DialogFooter>
+					<Button type="button" variant="outline" onClick={onCancel}>
+						Cancel
+					</Button>
+					<Button type="button" variant="destructive" onClick={onDelete}>
+						Delete message
+					</Button>
+				</DialogFooter>
+			</DialogContent>
+		</Dialog>
+	);
+}

apps/app/src/timeline.ts

@@ -1,4 +1,4 @@
-import type { QueuedMessage } from "@ace/channel/protocol";
+import type { QueuedMessage, Reactions } from "@ace/channel/protocol";
 import type { Listing, People } from "@ace/host/protocol";
 import type { Event } from "@ace/ui";
 
@@ -126,14 +126,25 @@ export function toEvents(
 	channels: Map<string, Listing>,
 	captions: Record<string, string>,
 	recaps: Record<string, string>,
+	reactions: Reactions,
 ): Event[] {
 	const events = items.map((item) => {
+		const reacted = item.entry === undefined ? undefined : reactions[item.entry];
 		const base = {
 			id: `${topic}::${item.key}`,
 			uid: item.key,
 			type: "message",
 			topic,
 			created_at: Math.floor(item.at / 1000),
+			...(reacted
+				? {
+					reactions: reacted.map(({ from, emoji }) => ({
+						from,
+						display: authorName(from, people, channels),
+						emoji,
+					})),
+				}
+				: {}),
 		} as const;
 		if (item.kind === "message") {
 			return {
@@ -143,7 +154,7 @@ export function toEvents(
 					value: item.author,
 					display: authorName(item.author, people, channels),
 				},
-				content: [
+				content: item.deleted ? [text("Message deleted")] : [
 					text(item.invoked && !/(^|\s)@ace\b/i.test(item.text) ? `@ace ${item.text}` : item.text),
 					...(item.images || []).map((image) => ({
 						type: "image" as const,

apps/app/src/transcript.ts

@@ -1,6 +1,6 @@
 import { useEffect, useState } from "react";
 
-import type { Image, QueuedMessage } from "@ace/channel/protocol";
+import type { Image, QueuedMessage, Reactions } from "@ace/channel/protocol";
 import { DISCONNECTED } from "@ace/host/gateway-client";
 import { CHANNEL_CLOSED, type ChannelInfo, type Event } from "@ace/host/protocol";
 
@@ -25,15 +25,19 @@ export type Item =
 	| {
 		kind: "message";
 		key: string;
+		entry: number;
 		at: number;
 		author: string;
 		text: string;
 		images?: Image[];
 		invoked: boolean;
+		deleted?: boolean;
 	}
 	| {
 		kind: "reply";
 		key: string;
+		/** Absent for a reply that only called tools, which takes no reactions. */
+		entry?: number;
 		at: number;
 		model: string;
 		text: string;
@@ -55,6 +59,7 @@ export type Transcript = {
 	captions: Record<string, string>;
 	/** Each tool call's recap of the work it was part of, by call ID. */
 	recaps: Record<string, string>;
+	reactions: Reactions;
 	/** Text streamed for the reply being generated. */
 	draft: string;
 	busy: boolean;
@@ -71,6 +76,7 @@ const EMPTY: Transcript = {
 	withdrawn: [],
 	captions: {},
 	recaps: {},
+	reactions: {},
 	draft: "",
 	busy: false,
 	live: false,
@@ -94,10 +100,22 @@ export function apply(state: Transcript, event: Event): Transcript {
 				...state,
 				items: [...state.items, { kind: "message", key: `e${event.entry}`, ...pick(event) }],
 			};
+		case "deleted":
+			return {
+				...state,
+				items: state.items.map((item) =>
+					item.kind === "message" && item.entry === event.entry
+						? { ...item, text: "", images: undefined, deleted: true }
+						: item
+				),
+			};
+		case "reactions":
+			return { ...state, reactions: event.reactions };
 		case "reply": {
 			const item: Item = {
 				kind: "reply",
 				key: `e${event.entry}`,
+				entry: event.entry,
 				at: event.at,
 				model: event.model,
 				text: event.text,
@@ -226,8 +244,16 @@ function withdraw(items: Item[], messages: QueuedMessage[]): Item[] {
 }
 
 function pick(event: Extract<Event, { kind: "message" }>) {
-	const { at, author, text, images, invoked } = event;
-	return { at, author, text, ...(images ? { images } : {}), invoked };
+	const { entry, at, author, text, images, invoked, deleted } = event;
+	return {
+		entry,
+		at,
+		author,
+		text,
+		...(images ? { images } : {}),
+		invoked,
+		...(deleted ? { deleted } : {}),
+	};
 }
 
 /** Automatic re-watches allowed before a watch stays open for `STABLE` ms. */
@@ -298,6 +324,7 @@ export function useTranscript(
 				queue: true,
 				captions: true,
 				progress: true,
+				actions: true,
 				...(chat === undefined ? {} : { chat }),
 			}, {
 				event(event) {