diff --git a/extensions/discord/src/monitor/inbound-dedupe.ts b/extensions/discord/src/monitor/inbound-dedupe.ts
new file mode 100644
index 00000000000..5f7ab4a2c45
--- /dev/null
+++ b/extensions/discord/src/monitor/inbound-dedupe.ts
@@ -0,0 +1,73 @@
+import { createClaimableDedupe, type ClaimableDedupe } from "openclaw/plugin-sdk/persistent-dedupe";
+import type { DiscordMessageEvent } from "./listeners.js";
+import { resolveDiscordMessageChannelId } from "./message-utils.js";
+
+const RECENT_DISCORD_MESSAGE_TTL_MS = 5 * 60_000;
+const RECENT_DISCORD_MESSAGE_MAX = 5000;
+
+export function createDiscordInboundReplayGuard(): ClaimableDedupe {
+  return createClaimableDedupe({
+    ttlMs: RECENT_DISCORD_MESSAGE_TTL_MS,
+    memoryMaxSize: RECENT_DISCORD_MESSAGE_MAX,
+  });
+}
+
+export class DiscordRetryableInboundError extends Error {
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+    this.name = "DiscordRetryableInboundError";
+  }
+}
+
+export function buildDiscordInboundReplayKey(params: {
+  accountId: string;
+  data: DiscordMessageEvent;
+}): string | null {
+  const messageId = params.data.message?.id?.trim();
+  if (!messageId) {
+    return null;
+  }
+  const channelId = resolveDiscordMessageChannelId({
+    message: params.data.message,
+    eventChannelId: params.data.channel_id,
+  });
+  if (!channelId) {
+    return null;
+  }
+  return `${params.accountId}:${channelId}:${messageId}`;
+}
+
+export async function claimDiscordInboundReplay(params: {
+  replayKey?: string | null;
+  replayGuard: ClaimableDedupe;
+}): Promise<boolean> {
+  const replayKey = params.replayKey?.trim();
+  if (!replayKey) {
+    return true;
+  }
+  const claim = await params.replayGuard.claim(replayKey);
+  return claim.kind === "claimed";
+}
+
+export async function commitDiscordInboundReplay(params: {
+  replayKeys?: readonly (string | null | undefined)[];
+  replayGuard: ClaimableDedupe;
+}): Promise<void> {
+  const replayKeys = normalizeDiscordInboundReplayKeys(params.replayKeys);
+  await Promise.all(replayKeys.map((replayKey) => params.replayGuard.commit(replayKey)));
+}
+
+export function releaseDiscordInboundReplay(params: {
+  replayKeys?: readonly (string | null | undefined)[];
+  replayGuard: ClaimableDedupe;
+  error?: unknown;
+}): void {
+  const replayKeys = normalizeDiscordInboundReplayKeys(params.replayKeys);
+  replayKeys.forEach((replayKey) => params.replayGuard.release(replayKey, { error: params.error }));
+}
+
+function normalizeDiscordInboundReplayKeys(
+  replayKeys?: readonly (string | null | undefined)[],
+): string[] {
+  return [...new Set((replayKeys ?? []).map((replayKey) => replayKey?.trim()).filter(Boolean))];
+}
diff --git a/extensions/discord/src/monitor/inbound-job.test.ts b/extensions/discord/src/monitor/inbound-job.test.ts
index 756602336d9..8cf7983792a 100644
--- a/extensions/discord/src/monitor/inbound-job.test.ts
+++ b/extensions/discord/src/monitor/inbound-job.test.ts
@@ -92,7 +92,7 @@ describe("buildDiscordInboundJob", () => {
 
   it("re-materializes the process context with an overridden abort signal", async () => {
     const ctx = await createBaseDiscordMessageContext();
-    const job = buildDiscordInboundJob(ctx);
+    const job = buildDiscordInboundJob(ctx, { replayKeys: ["default:ch-1:m-1"] });
     const overrideAbortController = new AbortController();
 
     const rematerialized = materializeDiscordInboundJob(job, overrideAbortController.signal);
@@ -103,6 +103,7 @@ describe("buildDiscordInboundJob", () => {
     expect(rematerialized.abortSignal).toBe(overrideAbortController.signal);
     expect(rematerialized.message).toEqual(job.payload.message);
     expect(rematerialized.data).toEqual(job.payload.data);
+    expect(job.replayKeys).toEqual(["default:ch-1:m-1"]);
   });
 
   it("preserves Carbon message getters across queued jobs", async () => {
diff --git a/extensions/discord/src/monitor/inbound-job.ts b/extensions/discord/src/monitor/inbound-job.ts
index 2f8c9520f12..087ca41b6cb 100644
--- a/extensions/discord/src/monitor/inbound-job.ts
+++ b/extensions/discord/src/monitor/inbound-job.ts
@@ -22,6 +22,7 @@ export type DiscordInboundJob = {
   queueKey: string;
   payload: DiscordInboundJobPayload;
   runtime: DiscordInboundJobRuntime;
+  replayKeys?: string[];
 };
 
 export function resolveDiscordInboundJobQueueKey(ctx: DiscordMessagePreflightContext): string {
@@ -36,7 +37,10 @@ export function resolveDiscordInboundJobQueueKey(ctx: DiscordMessagePreflightCon
   return ctx.messageChannelId;
 }
 
-export function buildDiscordInboundJob(ctx: DiscordMessagePreflightContext): DiscordInboundJob {
+export function buildDiscordInboundJob(
+  ctx: DiscordMessagePreflightContext,
+  options?: { replayKeys?: readonly string[] },
+): DiscordInboundJob {
   const {
     runtime,
     abortSignal,
@@ -70,6 +74,7 @@ export function buildDiscordInboundJob(ctx: DiscordMessagePreflightContext): Dis
       threadBindings,
       discordRestFetch,
     },
+    replayKeys: options?.replayKeys ? [...options.replayKeys] : undefined,
   };
 }
 
diff --git a/extensions/discord/src/monitor/inbound-worker.ts b/extensions/discord/src/monitor/inbound-worker.ts
index 9340534ffdd..fb34e7e87d8 100644
--- a/extensions/discord/src/monitor/inbound-worker.ts
+++ b/extensions/discord/src/monitor/inbound-worker.ts
@@ -1,7 +1,14 @@
 import { createRunStateMachine } from "openclaw/plugin-sdk/channel-lifecycle";
 import { KeyedAsyncQueue } from "openclaw/plugin-sdk/keyed-async-queue";
+import type { ClaimableDedupe } from "openclaw/plugin-sdk/persistent-dedupe";
 import { danger, formatDurationSeconds } from "openclaw/plugin-sdk/runtime-env";
 import { normalizeOptionalString } from "openclaw/plugin-sdk/text-runtime";
+import {
+  commitDiscordInboundReplay,
+  createDiscordInboundReplayGuard,
+  DiscordRetryableInboundError,
+  releaseDiscordInboundReplay,
+} from "./inbound-dedupe.js";
 import { materializeDiscordInboundJob, type DiscordInboundJob } from "./inbound-job.js";
 import type { RuntimeEnv } from "./message-handler.preflight.types.js";
 import { processDiscordMessage } from "./message-handler.process.js";
@@ -15,6 +22,7 @@ type DiscordInboundWorkerParams = {
   setStatus?: DiscordMonitorStatusSink;
   abortSignal?: AbortSignal;
   runTimeoutMs?: number;
+  replayGuard?: ClaimableDedupe;
   __testing?: DiscordInboundWorkerTestingHooks;
 };
 
@@ -46,6 +54,7 @@ async function processDiscordInboundJob(params: {
   runtime: RuntimeEnv;
   lifecycleSignal?: AbortSignal;
   runTimeoutMs?: number;
+  replayGuard: ClaimableDedupe;
   testing?: DiscordInboundWorkerTestingHooks;
 }) {
   const timeoutMs = normalizeDiscordInboundWorkerTimeoutMs(params.runTimeoutMs);
@@ -54,50 +63,70 @@ async function processDiscordInboundJob(params: {
   let createdThreadId: string | undefined;
   let sessionKey: string | undefined;
   const processDiscordMessageImpl = params.testing?.processDiscordMessage ?? processDiscordMessage;
-  await runDiscordTaskWithTimeout({
-    run: async (abortSignal) => {
-      await processDiscordMessageImpl(materializeDiscordInboundJob(params.job, abortSignal), {
-        onFinalReplyStart: () => {
-          finalReplyStarted = true;
-        },
-        onFinalReplyDelivered: () => {
-          finalReplyStarted = true;
-        },
-        onReplyPlanResolved: (resolved) => {
-          createdThreadId = normalizeOptionalString(resolved.createdThreadId);
-          sessionKey = normalizeOptionalString(resolved.sessionKey);
-        },
+  try {
+    await runDiscordTaskWithTimeout({
+      run: async (abortSignal) => {
+        await processDiscordMessageImpl(materializeDiscordInboundJob(params.job, abortSignal), {
+          onFinalReplyStart: () => {
+            finalReplyStarted = true;
+          },
+          onFinalReplyDelivered: () => {
+            finalReplyStarted = true;
+          },
+          onReplyPlanResolved: (resolved) => {
+            createdThreadId = normalizeOptionalString(resolved.createdThreadId);
+            sessionKey = normalizeOptionalString(resolved.sessionKey);
+          },
+        });
+      },
+      timeoutMs,
+      abortSignals: [params.job.runtime.abortSignal, params.lifecycleSignal],
+      onTimeout: async (resolvedTimeoutMs) => {
+        params.runtime.error?.(
+          danger(
+            `discord inbound worker timed out after ${formatDurationSeconds(resolvedTimeoutMs, {
+              decimals: 1,
+              unit: "seconds",
+            })}${contextSuffix}`,
+          ),
+        );
+        if (finalReplyStarted) {
+          return;
+        }
+        await sendDiscordInboundWorkerTimeoutReply({
+          job: params.job,
+          runtime: params.runtime,
+          contextSuffix,
+          createdThreadId,
+          sessionKey,
+          deliverDiscordReplyImpl: params.testing?.deliverDiscordReply,
+        });
+      },
+      onErrorAfterTimeout: (error) => {
+        params.runtime.error?.(
+          danger(`discord inbound worker failed after timeout: ${String(error)}${contextSuffix}`),
+        );
+      },
+    });
+    await commitDiscordInboundReplay({
+      replayKeys: params.job.replayKeys,
+      replayGuard: params.replayGuard,
+    });
+  } catch (error) {
+    if (error instanceof DiscordRetryableInboundError) {
+      releaseDiscordInboundReplay({
+        replayKeys: params.job.replayKeys,
+        error,
+        replayGuard: params.replayGuard,
       });
-    },
-    timeoutMs,
-    abortSignals: [params.job.runtime.abortSignal, params.lifecycleSignal],
-    onTimeout: async (resolvedTimeoutMs) => {
-      params.runtime.error?.(
-        danger(
-          `discord inbound worker timed out after ${formatDurationSeconds(resolvedTimeoutMs, {
-            decimals: 1,
-            unit: "seconds",
-          })}${contextSuffix}`,
-        ),
-      );
-      if (finalReplyStarted) {
-        return;
-      }
-      await sendDiscordInboundWorkerTimeoutReply({
-        job: params.job,
-        runtime: params.runtime,
-        contextSuffix,
-        createdThreadId,
-        sessionKey,
-        deliverDiscordReplyImpl: params.testing?.deliverDiscordReply,
+    } else {
+      await commitDiscordInboundReplay({
+        replayKeys: params.job.replayKeys,
+        replayGuard: params.replayGuard,
       });
-    },
-    onErrorAfterTimeout: (error) => {
-      params.runtime.error?.(
-        danger(`discord inbound worker failed after timeout: ${String(error)}${contextSuffix}`),
-      );
-    },
-  });
+    }
+    throw error;
+  }
 }
 
 async function sendDiscordInboundWorkerTimeoutReply(params: {
@@ -163,6 +192,7 @@ export function createDiscordInboundWorker(
     setStatus: params.setStatus,
     abortSignal: params.abortSignal,
   });
+  const replayGuard = params.replayGuard ?? createDiscordInboundReplayGuard();
 
   return {
     enqueue(job) {
@@ -181,6 +211,7 @@ export function createDiscordInboundWorker(
               runtime: params.runtime,
               lifecycleSignal: params.abortSignal,
               runTimeoutMs: params.runTimeoutMs,
+              replayGuard,
               testing: params.__testing,
             });
           } finally {
diff --git a/extensions/discord/src/monitor/message-handler.queue.test.ts b/extensions/discord/src/monitor/message-handler.queue.test.ts
index 61f02ab5c6a..81bfed66913 100644
--- a/extensions/discord/src/monitor/message-handler.queue.test.ts
+++ b/extensions/discord/src/monitor/message-handler.queue.test.ts
@@ -1,4 +1,5 @@
 import { describe, expect, it, vi } from "vitest";
+import { DiscordRetryableInboundError } from "./inbound-dedupe.js";
 import {
   createDiscordMessageHandler,
   preflightDiscordMessageMock,
@@ -252,6 +253,69 @@ describe("createDiscordMessageHandler queue behavior", () => {
     expect(preflightDiscordMessageMock).toHaveBeenCalledTimes(1);
   });
 
+  it("retries duplicate deliveries after an explicit retryable worker failure", async () => {
+    preflightDiscordMessageMock.mockReset();
+    processDiscordMessageMock.mockReset();
+
+    processDiscordMessageMock
+      .mockRejectedValueOnce(new DiscordRetryableInboundError("retry me"))
+      .mockResolvedValueOnce(undefined);
+    const params = createDiscordHandlerParams();
+    const handler = createDiscordMessageHandler(params);
+    installDefaultDiscordPreflight();
+    const duplicate = createMessageData("m-retry");
+
+    await expect(handler(duplicate as never, {} as never)).resolves.toBeUndefined();
+    await vi.waitFor(() => {
+      expect(processDiscordMessageMock).toHaveBeenCalledTimes(1);
+    });
+    await vi.waitFor(() => {
+      expect(params.runtime.error).toHaveBeenCalledWith(
+        expect.stringContaining(
+          "discord inbound worker failed: DiscordRetryableInboundError: retry me",
+        ),
+      );
+    });
+
+    await expect(handler(duplicate as never, {} as never)).resolves.toBeUndefined();
+    await vi.waitFor(() => {
+      expect(processDiscordMessageMock).toHaveBeenCalledTimes(2);
+    });
+    expect(preflightDiscordMessageMock).toHaveBeenCalledTimes(2);
+  });
+
+  it("keeps replay committed after a non-retryable worker failure", async () => {
+    preflightDiscordMessageMock.mockReset();
+    processDiscordMessageMock.mockReset();
+
+    const visibleSideEffect = vi.fn();
+    processDiscordMessageMock.mockImplementationOnce(async () => {
+      visibleSideEffect();
+      throw new Error("post-send failure");
+    });
+    const params = createDiscordHandlerParams();
+    const handler = createDiscordMessageHandler(params);
+    installDefaultDiscordPreflight();
+    const duplicate = createMessageData("m-fail");
+
+    await expect(handler(duplicate as never, {} as never)).resolves.toBeUndefined();
+    await vi.waitFor(() => {
+      expect(processDiscordMessageMock).toHaveBeenCalledTimes(1);
+    });
+    await vi.waitFor(() => {
+      expect(params.runtime.error).toHaveBeenCalledWith(
+        expect.stringContaining("discord inbound worker failed: Error: post-send failure"),
+      );
+    });
+
+    await expect(handler(duplicate as never, {} as never)).resolves.toBeUndefined();
+    await Promise.resolve();
+
+    expect(processDiscordMessageMock).toHaveBeenCalledTimes(1);
+    expect(preflightDiscordMessageMock).toHaveBeenCalledTimes(1);
+    expect(visibleSideEffect).toHaveBeenCalledTimes(1);
+  });
+
   it("applies explicit inbound worker timeout to queued runs so stalled runs do not block the queue", async () => {
     vi.useFakeTimers();
     try {
diff --git a/extensions/discord/src/monitor/message-handler.ts b/extensions/discord/src/monitor/message-handler.ts
index f4ede4bcabe..ab168faa622 100644
--- a/extensions/discord/src/monitor/message-handler.ts
+++ b/extensions/discord/src/monitor/message-handler.ts
@@ -4,8 +4,15 @@ import {
   shouldDebounceTextInbound,
 } from "openclaw/plugin-sdk/channel-inbound";
 import { resolveOpenProviderRuntimeGroupPolicy } from "openclaw/plugin-sdk/config-runtime";
-import { createDedupeCache } from "openclaw/plugin-sdk/infra-runtime";
 import { danger } from "openclaw/plugin-sdk/runtime-env";
+import {
+  buildDiscordInboundReplayKey,
+  claimDiscordInboundReplay,
+  commitDiscordInboundReplay,
+  createDiscordInboundReplayGuard,
+  DiscordRetryableInboundError,
+  releaseDiscordInboundReplay,
+} from "./inbound-dedupe.js";
 import { buildDiscordInboundJob } from "./inbound-job.js";
 import {
   createDiscordInboundWorker,
@@ -40,27 +47,6 @@ export type DiscordMessageHandlerWithLifecycle = DiscordMessageHandler & {
   deactivate: () => void;
 };
 
-const RECENT_DISCORD_MESSAGE_TTL_MS = 5 * 60_000;
-const RECENT_DISCORD_MESSAGE_MAX = 5000;
-
-function buildDiscordInboundDedupeKey(params: {
-  accountId: string;
-  data: DiscordMessageEvent;
-}): string | null {
-  const messageId = params.data.message?.id?.trim();
-  if (!messageId) {
-    return null;
-  }
-  const channelId = resolveDiscordMessageChannelId({
-    message: params.data.message,
-    eventChannelId: params.data.channel_id,
-  });
-  if (!channelId) {
-    return null;
-  }
-  return `${params.accountId}:${channelId}:${messageId}`;
-}
-
 export function createDiscordMessageHandler(
   params: DiscordMessageHandlerParams,
 ): DiscordMessageHandlerWithLifecycle {
@@ -75,22 +61,21 @@ export function createDiscordMessageHandler(
     "group-mentions";
   const preflightDiscordMessageImpl =
     params.__testing?.preflightDiscordMessage ?? preflightDiscordMessage;
+  const replayGuard = createDiscordInboundReplayGuard();
   const inboundWorker = createDiscordInboundWorker({
     runtime: params.runtime,
     setStatus: params.setStatus,
     abortSignal: params.abortSignal,
     runTimeoutMs: params.workerRunTimeoutMs,
+    replayGuard,
     __testing: params.__testing,
   });
-  const recentInboundMessages = createDedupeCache({
-    ttlMs: RECENT_DISCORD_MESSAGE_TTL_MS,
-    maxSize: RECENT_DISCORD_MESSAGE_MAX,
-  });
 
   const { debouncer } = createChannelInboundDebouncer<{
     data: DiscordMessageEvent;
     client: Client;
     abortSignal?: AbortSignal;
+    replayKey?: string;
   }>({
     cfg: params.cfg,
     channel: "discord",
@@ -129,70 +114,90 @@ export function createDiscordMessageHandler(
       if (!last) {
         return;
       }
+      const replayKeys = entries.map((entry) => entry.replayKey).filter(Boolean);
       const abortSignal = last.abortSignal;
       if (abortSignal?.aborted) {
+        releaseDiscordInboundReplay({
+          replayKeys,
+          error: abortSignal.reason,
+          replayGuard,
+        });
         return;
       }
-      if (entries.length === 1) {
+      try {
+        if (entries.length === 1) {
+          const ctx = await preflightDiscordMessageImpl({
+            ...params,
+            ackReactionScope,
+            groupPolicy,
+            abortSignal,
+            data: last.data,
+            client: last.client,
+          });
+          if (!ctx) {
+            await commitDiscordInboundReplay({ replayKeys, replayGuard });
+            return;
+          }
+          applyImplicitReplyBatchGate(ctx, params.replyToMode, false);
+          inboundWorker.enqueue(buildDiscordInboundJob(ctx, { replayKeys }));
+          return;
+        }
+        const combinedBaseText = entries
+          .map((entry) =>
+            resolveDiscordMessageText(entry.data.message, { includeForwarded: false }),
+          )
+          .filter(Boolean)
+          .join("\n");
+        const syntheticMessage = {
+          ...last.data.message,
+          content: combinedBaseText,
+          attachments: [],
+          message_snapshots: (last.data.message as { message_snapshots?: unknown })
+            .message_snapshots,
+          messageSnapshots: (last.data.message as { messageSnapshots?: unknown }).messageSnapshots,
+          rawData: {
+            ...(last.data.message as { rawData?: Record<string, unknown> }).rawData,
+          },
+        };
+        const syntheticData: DiscordMessageEvent = {
+          ...last.data,
+          message: syntheticMessage,
+        };
         const ctx = await preflightDiscordMessageImpl({
           ...params,
           ackReactionScope,
           groupPolicy,
           abortSignal,
-          data: last.data,
+          data: syntheticData,
           client: last.client,
         });
         if (!ctx) {
+          await commitDiscordInboundReplay({ replayKeys, replayGuard });
           return;
         }
-        applyImplicitReplyBatchGate(ctx, params.replyToMode, false);
-        inboundWorker.enqueue(buildDiscordInboundJob(ctx));
-        return;
-      }
-      const combinedBaseText = entries
-        .map((entry) => resolveDiscordMessageText(entry.data.message, { includeForwarded: false }))
-        .filter(Boolean)
-        .join("\n");
-      const syntheticMessage = {
-        ...last.data.message,
-        content: combinedBaseText,
-        attachments: [],
-        message_snapshots: (last.data.message as { message_snapshots?: unknown }).message_snapshots,
-        messageSnapshots: (last.data.message as { messageSnapshots?: unknown }).messageSnapshots,
-        rawData: {
-          ...(last.data.message as { rawData?: Record<string, unknown> }).rawData,
-        },
-      };
-      const syntheticData: DiscordMessageEvent = {
-        ...last.data,
-        message: syntheticMessage,
-      };
-      const ctx = await preflightDiscordMessageImpl({
-        ...params,
-        ackReactionScope,
-        groupPolicy,
-        abortSignal,
-        data: syntheticData,
-        client: last.client,
-      });
-      if (!ctx) {
-        return;
-      }
-      applyImplicitReplyBatchGate(ctx, params.replyToMode, true);
-      if (entries.length > 1) {
-        const ids = entries.map((entry) => entry.data.message?.id).filter(Boolean) as string[];
-        if (ids.length > 0) {
-          const ctxBatch = ctx as typeof ctx & {
-            MessageSids?: string[];
-            MessageSidFirst?: string;
-            MessageSidLast?: string;
-          };
-          ctxBatch.MessageSids = ids;
-          ctxBatch.MessageSidFirst = ids[0];
-          ctxBatch.MessageSidLast = ids[ids.length - 1];
+        applyImplicitReplyBatchGate(ctx, params.replyToMode, true);
+        if (entries.length > 1) {
+          const ids = entries.map((entry) => entry.data.message?.id).filter(Boolean) as string[];
+          if (ids.length > 0) {
+            const ctxBatch = ctx as typeof ctx & {
+              MessageSids?: string[];
+              MessageSidFirst?: string;
+              MessageSidLast?: string;
+            };
+            ctxBatch.MessageSids = ids;
+            ctxBatch.MessageSidFirst = ids[0];
+            ctxBatch.MessageSidLast = ids[ids.length - 1];
+          }
         }
+        inboundWorker.enqueue(buildDiscordInboundJob(ctx, { replayKeys }));
+      } catch (error) {
+        if (error instanceof DiscordRetryableInboundError) {
+          releaseDiscordInboundReplay({ replayKeys, error, replayGuard });
+        } else {
+          await commitDiscordInboundReplay({ replayKeys, replayGuard });
+        }
+        throw error;
       }
-      inboundWorker.enqueue(buildDiscordInboundJob(ctx));
     },
     onError: (err) => {
       params.runtime.error?.(danger(`discord debounce flush failed: ${String(err)}`));
@@ -213,15 +218,25 @@ export function createDiscordMessageHandler(
       if (params.botUserId && msgAuthorId === params.botUserId) {
         return;
       }
-      const dedupeKey = buildDiscordInboundDedupeKey({
+      const replayKey = buildDiscordInboundReplayKey({
         accountId: params.accountId,
         data,
       });
-      if (dedupeKey && recentInboundMessages.check(dedupeKey)) {
+      if (
+        !(await claimDiscordInboundReplay({
+          replayKey,
+          replayGuard,
+        }))
+      ) {
         return;
       }
 
-      await debouncer.enqueue({ data, client, abortSignal: options?.abortSignal });
+      await debouncer.enqueue({
+        data,
+        client,
+        abortSignal: options?.abortSignal,
+        replayKey: replayKey ?? undefined,
+      });
     } catch (err) {
       params.runtime.error?.(danger(`handler failed: ${String(err)}`));
     }