diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c761bac4a5..ff3cb120efd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Feishu/Duplicate replies: suppress same-target reply dispatch when message-tool sends use generic provider metadata (`provider: "message"`) and normalize `lark`/`feishu` provider aliases during duplicate-target checks, preventing double-delivery in Feishu sessions. (#31526)
 - Pairing/AllowFrom account fallback: handle omitted `accountId` values in `readChannelAllowFromStore` and `readChannelAllowFromStoreSync` as `default`, while preserving legacy unscoped allowFrom merges for default-account flows. Thanks @Sid-Qin and @vincentkoc.
 - Agents/Subagent announce cleanup: keep completion-message runs pending while descendants settle, add a 30 minute hard-expiry backstop to avoid indefinite pending state, and keep retry bookkeeping resumable across deferred wakes. (#23970) Thanks @tyler6204.
 - BlueBubbles/Message metadata: harden send response ID extraction, include sender identity in DM context, and normalize inbound `message_id` selection to avoid duplicate ID metadata. (#23970) Thanks @tyler6204.
diff --git a/src/auto-reply/reply/agent-runner-payloads.test.ts b/src/auto-reply/reply/agent-runner-payloads.test.ts
index 9b62db984e8..138efd8e49d 100644
--- a/src/auto-reply/reply/agent-runner-payloads.test.ts
+++ b/src/auto-reply/reply/agent-runner-payloads.test.ts
@@ -86,6 +86,34 @@ describe("buildReplyPayloads media filter integration", () => {
     expect(replyPayloads).toHaveLength(0);
   });
 
+  it("suppresses same-target replies when message tool target provider is generic", () => {
+    const { replyPayloads } = buildReplyPayloads({
+      ...baseParams,
+      payloads: [{ text: "hello world!" }],
+      messageProvider: "heartbeat",
+      originatingChannel: "feishu",
+      originatingTo: "ou_abc123",
+      messagingToolSentTexts: ["different message"],
+      messagingToolSentTargets: [{ tool: "message", provider: "message", to: "ou_abc123" }],
+    });
+
+    expect(replyPayloads).toHaveLength(0);
+  });
+
+  it("suppresses same-target replies when target provider is channel alias", () => {
+    const { replyPayloads } = buildReplyPayloads({
+      ...baseParams,
+      payloads: [{ text: "hello world!" }],
+      messageProvider: "heartbeat",
+      originatingChannel: "feishu",
+      originatingTo: "ou_abc123",
+      messagingToolSentTexts: ["different message"],
+      messagingToolSentTargets: [{ tool: "message", provider: "lark", to: "ou_abc123" }],
+    });
+
+    expect(replyPayloads).toHaveLength(0);
+  });
+
   it("does not suppress same-target replies when accountId differs", () => {
     const { replyPayloads } = buildReplyPayloads({
       ...baseParams,
diff --git a/src/auto-reply/reply/reply-payloads.ts b/src/auto-reply/reply/reply-payloads.ts
index a408e942a2d..2c620e7320c 100644
--- a/src/auto-reply/reply/reply-payloads.ts
+++ b/src/auto-reply/reply/reply-payloads.ts
@@ -1,5 +1,6 @@
 import { isMessagingToolDuplicate } from "../../agents/pi-embedded-helpers.js";
 import type { MessagingToolSend } from "../../agents/pi-embedded-runner.js";
+import { normalizeChannelId } from "../../channels/plugins/index.js";
 import type { ReplyToMode } from "../../config/types.js";
 import { normalizeTargetForProvider } from "../../infra/outbound/target-normalization.js";
 import { normalizeOptionalAccountId } from "../../routing/account-id.js";
@@ -144,13 +145,30 @@ export function filterMessagingToolMediaDuplicates(params: {
   });
 }
 
+const PROVIDER_ALIAS_MAP: Record<string, string> = {
+  lark: "feishu",
+};
+
+function normalizeProviderForComparison(value?: string): string | undefined {
+  const trimmed = value?.trim();
+  if (!trimmed) {
+    return undefined;
+  }
+  const lowered = trimmed.toLowerCase();
+  const normalizedChannel = normalizeChannelId(trimmed);
+  if (normalizedChannel) {
+    return normalizedChannel;
+  }
+  return PROVIDER_ALIAS_MAP[lowered] ?? lowered;
+}
+
 export function shouldSuppressMessagingToolReplies(params: {
   messageProvider?: string;
   messagingToolSentTargets?: MessagingToolSend[];
   originatingTo?: string;
   accountId?: string;
 }): boolean {
-  const provider = params.messageProvider?.trim().toLowerCase();
+  const provider = normalizeProviderForComparison(params.messageProvider);
   if (!provider) {
     return false;
   }
@@ -164,13 +182,16 @@ export function shouldSuppressMessagingToolReplies(params: {
     return false;
   }
   return sentTargets.some((target) => {
-    if (!target?.provider) {
+    const targetProvider = normalizeProviderForComparison(target?.provider);
+    if (!targetProvider) {
       return false;
     }
-    if (target.provider.trim().toLowerCase() !== provider) {
+    const isGenericMessageProvider = targetProvider === "message";
+    if (!isGenericMessageProvider && targetProvider !== provider) {
       return false;
     }
-    const targetKey = normalizeTargetForProvider(provider, target.to);
+    const targetNormalizationProvider = isGenericMessageProvider ? provider : targetProvider;
+    const targetKey = normalizeTargetForProvider(targetNormalizationProvider, target.to);
     if (!targetKey) {
       return false;
     }