diff --git a/src/auto-reply/reply/agent-runner-payloads.ts b/src/auto-reply/reply/agent-runner-payloads.ts
index 8f288a72bed..d62f7844180 100644
--- a/src/auto-reply/reply/agent-runner-payloads.ts
+++ b/src/auto-reply/reply/agent-runner-payloads.ts
@@ -188,26 +188,23 @@ export async function buildReplyPayloads(params: {
   const dedupeRuntime = shouldCheckMessagingToolDedupe
     ? await loadReplyPayloadsDedupeRuntime()
     : null;
-  const suppressMessagingToolReplies =
-    dedupeRuntime?.shouldSuppressMessagingToolReplies({
-      messageProvider: resolveOriginMessageProvider({
-        originatingChannel: params.originatingChannel,
-        provider: params.messageProvider,
-      }),
-      messagingToolSentTargets,
-      originatingTo: resolveOriginMessageTo({
-        originatingTo: params.originatingTo,
-      }),
-      accountId: resolveOriginAccountId({
-        originatingAccountId: params.accountId,
-      }),
-    }) ?? false;
-  // Only dedupe against messaging tool sends for the same origin target.
-  // Cross-target sends (for example posting to another channel) must not
-  // suppress the current conversation's final reply.
-  // If target metadata is unavailable, keep legacy dedupe behavior.
-  const dedupeMessagingToolPayloads =
-    suppressMessagingToolReplies || messagingToolSentTargets.length === 0;
+  const messagingToolPayloadDedupe = dedupeRuntime?.resolveMessagingToolPayloadDedupe({
+    messageProvider: resolveOriginMessageProvider({
+      originatingChannel: params.originatingChannel,
+      provider: params.messageProvider,
+    }),
+    messagingToolSentTargets,
+    originatingTo: resolveOriginMessageTo({
+      originatingTo: params.originatingTo,
+    }),
+    accountId: resolveOriginAccountId({
+      originatingAccountId: params.accountId,
+    }),
+  }) ?? {
+    shouldDedupePayloads: shouldCheckMessagingToolDedupe && messagingToolSentTargets.length === 0,
+    suppressReplies: false,
+  };
+  const dedupeMessagingToolPayloads = messagingToolPayloadDedupe.shouldDedupePayloads;
   const messagingToolSentMediaUrls = dedupeMessagingToolPayloads
     ? await normalizeSentMediaUrlsForDedupe({
         sentMediaUrls: params.messagingToolSentMediaUrls ?? [],
@@ -284,7 +281,7 @@ export async function buildReplyPayloads(params: {
           sentMediaUrls: blockSentMediaUrls,
         })
       : contentSuppressedPayloads;
-  const replyPayloads = suppressMessagingToolReplies
+  const replyPayloads = messagingToolPayloadDedupe.suppressReplies
     ? []
     : filteredPayloads.filter(isRenderablePayload);
 
diff --git a/src/auto-reply/reply/followup-delivery.test.ts b/src/auto-reply/reply/followup-delivery.test.ts
index 290dba629c4..df61cb10054 100644
--- a/src/auto-reply/reply/followup-delivery.test.ts
+++ b/src/auto-reply/reply/followup-delivery.test.ts
@@ -43,6 +43,32 @@ describe("resolveFollowupDeliveryPayloads", () => {
     ).toEqual([{ mediaUrl: undefined, mediaUrls: undefined }]);
   });
 
+  it("does not dedupe text sent via messaging tool to another target", () => {
+    expect(
+      resolveFollowupDeliveryPayloads({
+        cfg: baseConfig,
+        payloads: [{ text: "hello world!" }],
+        messageProvider: "telegram",
+        originatingTo: "telegram:123",
+        sentTexts: ["hello world!"],
+        sentTargets: [{ tool: "discord", provider: "discord", to: "channel:C1" }],
+      }),
+    ).toEqual([{ text: "hello world!" }]);
+  });
+
+  it("does not dedupe media sent via messaging tool to another target", () => {
+    expect(
+      resolveFollowupDeliveryPayloads({
+        cfg: baseConfig,
+        payloads: [{ text: "photo", mediaUrl: "file:///tmp/photo.jpg" }],
+        messageProvider: "telegram",
+        originatingTo: "telegram:123",
+        sentMediaUrls: ["file:///tmp/photo.jpg"],
+        sentTargets: [{ tool: "slack", provider: "slack", to: "channel:C1" }],
+      }),
+    ).toEqual([{ text: "photo", mediaUrl: "file:///tmp/photo.jpg" }]);
+  });
+
   it("suppresses replies when a messaging tool already sent to the same provider and target", () => {
     expect(
       resolveFollowupDeliveryPayloads({
diff --git a/src/auto-reply/reply/followup-delivery.ts b/src/auto-reply/reply/followup-delivery.ts
index bce4f54740d..3b09c8e8027 100644
--- a/src/auto-reply/reply/followup-delivery.ts
+++ b/src/auto-reply/reply/followup-delivery.ts
@@ -12,7 +12,7 @@ import {
   applyReplyThreading,
   filterMessagingToolDuplicates,
   filterMessagingToolMediaDuplicates,
-  shouldSuppressMessagingToolReplies,
+  resolveMessagingToolPayloadDedupe,
 } from "./reply-payloads.js";
 import { resolveReplyToMode } from "./reply-threading.js";
 
@@ -35,10 +35,11 @@ export function resolveFollowupDeliveryPayloads(params: {
   sentTargets?: MessagingToolSend[];
   sentTexts?: string[];
 }): ReplyPayload[] {
-  const replyToChannel = resolveOriginMessageProvider({
+  const replyMessageProvider = resolveOriginMessageProvider({
     originatingChannel: params.originatingChannel,
     provider: params.messageProvider,
-  }) as OriginatingChannelType | undefined;
+  });
+  const replyToChannel = replyMessageProvider as OriginatingChannelType | undefined;
   const replyToMode = resolveReplyToMode(
     params.cfg,
     replyToChannel,
@@ -62,16 +63,8 @@ export function resolveFollowupDeliveryPayloads(params: {
     replyToMode,
     replyToChannel,
   });
-  const dedupedPayloads = filterMessagingToolDuplicates({
-    payloads: replyTaggedPayloads,
-    sentTexts: params.sentTexts ?? [],
-  });
-  const mediaFilteredPayloads = filterMessagingToolMediaDuplicates({
-    payloads: dedupedPayloads,
-    sentMediaUrls: params.sentMediaUrls ?? [],
-  });
-  const suppressMessagingToolReplies = shouldSuppressMessagingToolReplies({
-    messageProvider: replyToChannel,
+  const messagingToolPayloadDedupe = resolveMessagingToolPayloadDedupe({
+    messageProvider: replyMessageProvider,
     messagingToolSentTargets: params.sentTargets,
     originatingTo: resolveOriginMessageTo({
       originatingTo: params.originatingTo,
@@ -80,5 +73,17 @@ export function resolveFollowupDeliveryPayloads(params: {
       originatingAccountId: params.originatingAccountId,
     }),
   });
-  return suppressMessagingToolReplies ? [] : mediaFilteredPayloads;
+  const mediaFilteredPayloads = messagingToolPayloadDedupe.shouldDedupePayloads
+    ? filterMessagingToolMediaDuplicates({
+        payloads: replyTaggedPayloads,
+        sentMediaUrls: params.sentMediaUrls ?? [],
+      })
+    : replyTaggedPayloads;
+  const dedupedPayloads = messagingToolPayloadDedupe.shouldDedupePayloads
+    ? filterMessagingToolDuplicates({
+        payloads: mediaFilteredPayloads,
+        sentTexts: params.sentTexts ?? [],
+      })
+    : mediaFilteredPayloads;
+  return messagingToolPayloadDedupe.suppressReplies ? [] : dedupedPayloads;
 }
diff --git a/src/auto-reply/reply/reply-payloads-dedupe.runtime.ts b/src/auto-reply/reply/reply-payloads-dedupe.runtime.ts
index 48fc5a88eff..0ed11bde7ab 100644
--- a/src/auto-reply/reply/reply-payloads-dedupe.runtime.ts
+++ b/src/auto-reply/reply/reply-payloads-dedupe.runtime.ts
@@ -1,5 +1,7 @@
 export {
   filterMessagingToolDuplicates,
   filterMessagingToolMediaDuplicates,
+  resolveMessagingToolPayloadDedupe,
   shouldSuppressMessagingToolReplies,
+  type MessagingToolPayloadDedupeDecision,
 } from "./reply-payloads-dedupe.js";
diff --git a/src/auto-reply/reply/reply-payloads-dedupe.ts b/src/auto-reply/reply/reply-payloads-dedupe.ts
index 7077dbc4760..d1f59b2ff0d 100644
--- a/src/auto-reply/reply/reply-payloads-dedupe.ts
+++ b/src/auto-reply/reply/reply-payloads-dedupe.ts
@@ -204,3 +204,28 @@ export function shouldSuppressMessagingToolReplies(params: {
     });
   });
 }
+
+export type MessagingToolPayloadDedupeDecision = {
+  shouldDedupePayloads: boolean;
+  suppressReplies: boolean;
+};
+
+export function resolveMessagingToolPayloadDedupe(params: {
+  messageProvider?: string;
+  messagingToolSentTargets?: MessagingToolSend[];
+  originatingTo?: string;
+  accountId?: string;
+}): MessagingToolPayloadDedupeDecision {
+  const sentTargets = params.messagingToolSentTargets ?? [];
+  const suppressReplies = shouldSuppressMessagingToolReplies({
+    messageProvider: params.messageProvider,
+    messagingToolSentTargets: sentTargets,
+    originatingTo: params.originatingTo,
+    accountId: params.accountId,
+  });
+
+  return {
+    shouldDedupePayloads: suppressReplies || sentTargets.length === 0,
+    suppressReplies,
+  };
+}
diff --git a/src/auto-reply/reply/reply-payloads.test.ts b/src/auto-reply/reply/reply-payloads.test.ts
index ab2c5f0d0f2..0fb2cd9dd0a 100644
--- a/src/auto-reply/reply/reply-payloads.test.ts
+++ b/src/auto-reply/reply/reply-payloads.test.ts
@@ -3,6 +3,7 @@ import { resetPluginRuntimeStateForTest, setActivePluginRegistry } from "../../p
 import { createOutboundTestPlugin, createTestRegistry } from "../../test-utils/channel-plugins.js";
 import {
   filterMessagingToolMediaDuplicates,
+  resolveMessagingToolPayloadDedupe,
   shouldSuppressMessagingToolReplies,
 } from "./reply-payloads.js";
 
@@ -244,3 +245,43 @@ describe("shouldSuppressMessagingToolReplies", () => {
     ).toBe(true);
   });
 });
+
+describe("resolveMessagingToolPayloadDedupe", () => {
+  it("dedupes by content when messaging tool target metadata is unavailable", () => {
+    expect(
+      resolveMessagingToolPayloadDedupe({
+        messageProvider: "telegram",
+        originatingTo: "123",
+      }),
+    ).toEqual({
+      shouldDedupePayloads: true,
+      suppressReplies: false,
+    });
+  });
+
+  it("suppresses final replies when a messaging tool sent to the same route", () => {
+    expect(
+      resolveMessagingToolPayloadDedupe({
+        messageProvider: "telegram",
+        originatingTo: "123",
+        messagingToolSentTargets: [{ tool: "message", provider: "telegram", to: "123" }],
+      }),
+    ).toEqual({
+      shouldDedupePayloads: true,
+      suppressReplies: true,
+    });
+  });
+
+  it("keeps final payloads intact when a messaging tool sent to another route", () => {
+    expect(
+      resolveMessagingToolPayloadDedupe({
+        messageProvider: "telegram",
+        originatingTo: "123",
+        messagingToolSentTargets: [{ tool: "slack", provider: "slack", to: "channel:C1" }],
+      }),
+    ).toEqual({
+      shouldDedupePayloads: false,
+      suppressReplies: false,
+    });
+  });
+});
diff --git a/src/auto-reply/reply/reply-payloads.ts b/src/auto-reply/reply/reply-payloads.ts
index 13f732ae188..21adc3fadce 100644
--- a/src/auto-reply/reply/reply-payloads.ts
+++ b/src/auto-reply/reply/reply-payloads.ts
@@ -8,5 +8,7 @@ export {
 export {
   filterMessagingToolDuplicates,
   filterMessagingToolMediaDuplicates,
+  resolveMessagingToolPayloadDedupe,
   shouldSuppressMessagingToolReplies,
+  type MessagingToolPayloadDedupeDecision,
 } from "./reply-payloads-dedupe.js";