diff --git a/extensions/matrix/src/types.ts b/extensions/matrix/src/types.ts
index 2c12c673d17..564ad3118ce 100644
--- a/extensions/matrix/src/types.ts
+++ b/extensions/matrix/src/types.ts
@@ -110,7 +110,7 @@ export type CoreConfig = {
   };
   messages?: {
     ackReaction?: string;
-    ackReactionScope?: "group-mentions" | "group-all" | "direct" | "all";
+    ackReactionScope?: "group-mentions" | "group-all" | "direct" | "all" | "off" | "none";
   };
   [key: string]: unknown;
 };
diff --git a/src/config/schema.help.ts b/src/config/schema.help.ts
index 94f1766e487..22c50336188 100644
--- a/src/config/schema.help.ts
+++ b/src/config/schema.help.ts
@@ -1361,7 +1361,7 @@ export const FIELD_HELP: Record<string, string> = {
     "When true, suppress ⚠️ tool-error warnings from being shown to the user. The agent already sees errors in context and can retry. Default: false.",
   "messages.ackReaction": "Emoji reaction used to acknowledge inbound messages (empty disables).",
   "messages.ackReactionScope":
-    'When to send ack reactions ("group-mentions", "group-all", "direct", "all").',
+    'When to send ack reactions ("group-mentions", "group-all", "direct", "all", "off", "none"). "off"/"none" disables ack reactions entirely.',
   "messages.statusReactions":
     "Lifecycle status reactions that update the emoji on the trigger message as the agent progresses (queued → thinking → tool → done/error).",
   "messages.statusReactions.enabled":
diff --git a/src/config/types.discord.ts b/src/config/types.discord.ts
index d57a7b57416..531fc1106cd 100644
--- a/src/config/types.discord.ts
+++ b/src/config/types.discord.ts
@@ -292,6 +292,8 @@ export type DiscordAccountConfig = {
    * Discord supports both unicode emoji and custom emoji names.
    */
   ackReaction?: string;
+  /** When to send ack reactions for this Discord account. Overrides messages.ackReactionScope. */
+  ackReactionScope?: "group-mentions" | "group-all" | "direct" | "all" | "off" | "none";
   /** Bot activity status text (e.g. "Watching X"). */
   activity?: string;
   /** Bot status (online|dnd|idle|invisible). Defaults to online when presence is configured. */
diff --git a/src/config/types.messages.ts b/src/config/types.messages.ts
index ff71035e168..39a5ca7da69 100644
--- a/src/config/types.messages.ts
+++ b/src/config/types.messages.ts
@@ -112,7 +112,7 @@ export type MessagesConfig = {
   /** Emoji reaction used to acknowledge inbound messages (empty disables). */
   ackReaction?: string;
   /** When to send ack reactions. Default: "group-mentions". */
-  ackReactionScope?: "group-mentions" | "group-all" | "direct" | "all";
+  ackReactionScope?: "group-mentions" | "group-all" | "direct" | "all" | "off" | "none";
   /** Remove ack reaction after reply is sent (default: false). */
   removeAckAfterReply?: boolean;
   /** Lifecycle status reactions configuration. */
diff --git a/src/config/zod-schema.providers-core.ts b/src/config/zod-schema.providers-core.ts
index 1079cecdaf5..f0a3a8a1f95 100644
--- a/src/config/zod-schema.providers-core.ts
+++ b/src/config/zod-schema.providers-core.ts
@@ -508,6 +508,9 @@ export const DiscordAccountSchema = z
       .optional(),
     responsePrefix: z.string().optional(),
     ackReaction: z.string().optional(),
+    ackReactionScope: z
+      .enum(["group-mentions", "group-all", "direct", "all", "off", "none"])
+      .optional(),
     activity: z.string().optional(),
     status: z.enum(["online", "dnd", "idle", "invisible"]).optional(),
     activityType: z
diff --git a/src/config/zod-schema.session.ts b/src/config/zod-schema.session.ts
index c33c18f4066..648caa60f5b 100644
--- a/src/config/zod-schema.session.ts
+++ b/src/config/zod-schema.session.ts
@@ -152,7 +152,9 @@ export const MessagesSchema = z
     queue: QueueSchema,
     inbound: InboundDebounceSchema,
     ackReaction: z.string().optional(),
-    ackReactionScope: z.enum(["group-mentions", "group-all", "direct", "all"]).optional(),
+    ackReactionScope: z
+      .enum(["group-mentions", "group-all", "direct", "all", "off", "none"])
+      .optional(),
     removeAckAfterReply: z.boolean().optional(),
     statusReactions: z
       .object({
diff --git a/src/discord/monitor/message-handler.preflight.types.ts b/src/discord/monitor/message-handler.preflight.types.ts
index b491a231983..0cca0cb4085 100644
--- a/src/discord/monitor/message-handler.preflight.types.ts
+++ b/src/discord/monitor/message-handler.preflight.types.ts
@@ -30,7 +30,7 @@ export type DiscordMessagePreflightContext = {
   mediaMaxBytes: number;
   textLimit: number;
   replyToMode: ReplyToMode;
-  ackReactionScope: "all" | "direct" | "group-all" | "group-mentions";
+  ackReactionScope: "all" | "direct" | "group-all" | "group-mentions" | "off" | "none";
   groupPolicy: "open" | "disabled" | "allowlist";
 
   data: DiscordMessageEvent;
diff --git a/src/discord/monitor/message-handler.ts b/src/discord/monitor/message-handler.ts
index fd69ff4e320..71eb38ca72f 100644
--- a/src/discord/monitor/message-handler.ts
+++ b/src/discord/monitor/message-handler.ts
@@ -29,7 +29,10 @@ export function createDiscordMessageHandler(
     groupPolicy: params.discordConfig?.groupPolicy,
     defaultGroupPolicy: params.cfg.channels?.defaults?.groupPolicy,
   });
-  const ackReactionScope = params.cfg.messages?.ackReactionScope ?? "group-mentions";
+  const ackReactionScope =
+    params.discordConfig?.ackReactionScope ??
+    params.cfg.messages?.ackReactionScope ??
+    "group-mentions";
   const debounceMs = resolveInboundDebounceMs({ cfg: params.cfg, channel: "discord" });
 
   const debouncer = createInboundDebouncer<{ data: DiscordMessageEvent; client: Client }>({
diff --git a/src/telegram/bot-message-context.ts b/src/telegram/bot-message-context.ts
index 0c3df3570ab..fb43e53edfa 100644
--- a/src/telegram/bot-message-context.ts
+++ b/src/telegram/bot-message-context.ts
@@ -112,7 +112,7 @@ export type BuildTelegramMessageContextParams = {
   dmPolicy: DmPolicy;
   allowFrom?: Array<string | number>;
   groupAllowFrom?: Array<string | number>;
-  ackReactionScope: "off" | "group-mentions" | "group-all" | "direct" | "all";
+  ackReactionScope: "off" | "none" | "group-mentions" | "group-all" | "direct" | "all";
   logger: TelegramLogger;
   resolveGroupActivation: ResolveGroupActivation;
   resolveGroupRequireMention: ResolveGroupRequireMention;