diff --git a/extensions/discord/src/durable-delivery.test.ts b/extensions/discord/src/durable-delivery.test.ts
new file mode 100644
index 00000000000..49f21a33f94
--- /dev/null
+++ b/extensions/discord/src/durable-delivery.test.ts
@@ -0,0 +1,103 @@
+import { sendDurableMessageBatch } from "openclaw/plugin-sdk/channel-message";
+import {
+  createEmptyPluginRegistry,
+  createTestRegistry,
+  resetPluginRuntimeStateForTest,
+  setActivePluginRegistry,
+} from "openclaw/plugin-sdk/plugin-test-runtime";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import {
+  createDiscordOutboundHoisted,
+  installDiscordOutboundModuleSpies,
+  resetDiscordOutboundMocks,
+} from "./outbound-adapter.test-harness.js";
+
+const hoisted = createDiscordOutboundHoisted();
+await installDiscordOutboundModuleSpies(hoisted);
+
+let discordPlugin: typeof import("./channel.js").discordPlugin;
+
+beforeAll(async () => {
+  ({ discordPlugin } = await import("./channel.js"));
+});
+
+describe("durable Discord delivery", () => {
+  beforeEach(() => {
+    resetDiscordOutboundMocks(hoisted);
+    setActivePluginRegistry(
+      createTestRegistry([
+        {
+          pluginId: "discord",
+          source: "test",
+          plugin: discordPlugin,
+        },
+      ]),
+    );
+  });
+
+  afterEach(() => {
+    resetPluginRuntimeStateForTest();
+    setActivePluginRegistry(createEmptyPluginRegistry());
+  });
+
+  it("fans out planned text chunks and retries a transient failure on a later chunk", async () => {
+    hoisted.sendMessageDiscordMock
+      .mockResolvedValueOnce({
+        messageId: "msg-chunk-1",
+        channelId: "ch-1",
+      })
+      .mockRejectedValueOnce(Object.assign(new Error("discord 500"), { status: 500 }))
+      .mockResolvedValueOnce({
+        messageId: "msg-chunk-2",
+        channelId: "ch-1",
+      });
+
+    const result = await sendDurableMessageBatch({
+      cfg: {
+        channels: {
+          discord: {
+            token: "test-token",
+            retry: { attempts: 2, minDelayMs: 0, maxDelayMs: 0, jitter: 0 },
+          },
+        },
+      },
+      channel: "discord",
+      to: "channel:123456",
+      payloads: [{ text: "first chunk\nsecond chunk" }],
+      formatting: {
+        chunkMode: "newline",
+        maxLinesPerMessage: 1,
+        textLimit: 2000,
+      },
+      skipQueue: true,
+    });
+
+    expect(result.status).toBe("sent");
+    if (result.status !== "sent") {
+      throw new Error("expected durable Discord send to succeed");
+    }
+    expect(
+      result.results.map((entry) => ({
+        channel: entry.channel,
+        messageId: entry.messageId,
+      })),
+    ).toEqual([
+      { channel: "discord", messageId: "msg-chunk-1" },
+      { channel: "discord", messageId: "msg-chunk-2" },
+    ]);
+    expect(result.receipt.platformMessageIds).toEqual(["msg-chunk-1", "msg-chunk-2"]);
+    expect(result.payloadOutcomes).toEqual([
+      {
+        index: 0,
+        status: "sent",
+        results: result.results,
+      },
+    ]);
+    expect(hoisted.sendMessageDiscordMock).toHaveBeenCalledTimes(3);
+    expect(hoisted.sendMessageDiscordMock.mock.calls.map((call) => call[1])).toEqual([
+      "first chunk",
+      "second chunk",
+      "second chunk",
+    ]);
+  });
+});
diff --git a/extensions/telegram/src/message-cache.ts b/extensions/telegram/src/message-cache.ts
index 7a69995f73a..403d2443b73 100644
--- a/extensions/telegram/src/message-cache.ts
+++ b/extensions/telegram/src/message-cache.ts
@@ -568,7 +568,7 @@ export function createTelegramMessageCache(params?: {
         }
         const key = telegramMessageCacheKey({ accountId, chatId, messageId });
         const cachedNode = upsertCachedMessageNode({ messages, key, node, mode });
-        if (node.messageId === currentObservation.node.messageId) {
+        if (messageId === currentObservation.node.messageId) {
           recordedEntry = cachedNode;
         }
         trimMessages(messages, maxMessages);
@@ -697,11 +697,12 @@ function resolveSessionBoundaryNode(params: {
   if (!params.messageId) {
     return undefined;
   }
+  const { messageId } = params;
   const candidates = params.cache
     .recentBefore({
       accountId: params.accountId,
       chatId: params.chatId,
-      messageId: params.messageId,
+      messageId,
       ...(params.threadId !== undefined ? { threadId: params.threadId } : {}),
       limit: Number.MAX_SAFE_INTEGER,
     })
@@ -709,7 +710,7 @@ function resolveSessionBoundaryNode(params: {
   const current = params.cache.get({
     accountId: params.accountId,
     chatId: params.chatId,
-    messageId: params.messageId,
+    messageId,
   });
   if (current && isSessionBoundaryCommandNode(current)) {
     candidates.push(current);
diff --git a/src/scripts/test-projects.test.ts b/src/scripts/test-projects.test.ts
index b72064a1b22..6170fa6c162 100644
--- a/src/scripts/test-projects.test.ts
+++ b/src/scripts/test-projects.test.ts
@@ -943,6 +943,7 @@ describe("test-projects args", () => {
           "extensions/discord/src/channel-actions.contract.test.ts",
           "extensions/discord/src/channel.message-adapter.test.ts",
           "extensions/discord/src/channel.test.ts",
+          "extensions/discord/src/durable-delivery.test.ts",
           "extensions/discord/src/monitor/message-handler.bot-self-filter.test.ts",
           "extensions/discord/src/monitor/message-handler.queue.test.ts",
           "extensions/discord/src/monitor/provider.skill-dedupe.test.ts",