diff --git a/CHANGELOG.md b/CHANGELOG.md
index ecf4b9675b0..d05d33bc527 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ Docs: https://docs.openclaw.ai
 - Discord/voice: apply per-channel Discord `systemPrompt` overrides to voice transcript turns by forwarding the trusted channel prompt through the voice agent run. Fixes #47095. Thanks @qearlyao.
 - Discord/voice: run voice-channel turns under a voice-output policy that hides the agent `tts` tool and asks for spoken reply text, so `/vc join` sessions synthesize and play agent replies instead of ending with `NO_REPLY`. Fixes #61536. Thanks @aounakram.
 - Plugins/runtime-deps: include packaged OpenClaw identity in bundled plugin loader cache keys, so same-path package upgrades stop reusing stale versioned runtime-deps mirrors. Fixes #75045. Thanks @sahilsatralkar.
+- Plugin SDK: restore reply-prefix and reply-pipeline helpers on the deprecated root/compat SDK surface so external plugins still using `openclaw/plugin-sdk` do not fail message dispatch after update. Fixes #75171. Thanks @zhangxiliang.
 - Plugins/runtime-deps: prune inactive same-package versioned runtime-deps roots after bundled dependency repair, so upgrades do not leave old `openclaw-<version>-<hash>` package caches behind after doctor runs. Thanks @vincentkoc.
 - Plugins/runtime-deps: prune legacy version-scoped plugin runtime-deps roots during bundled dependency repair and cover the path in Package Acceptance's upgrade-survivor matrix, so upgrades from 2026.4.x no longer leave stale per-plugin runtime trees after doctor runs. Thanks @vincentkoc.
 - Plugins/runtime-deps: keep Gateway startup plugin imports and runtime plugin fallback loads verify-only after startup/config repair planning, so packaged installs no longer spawn package-manager repair from hot paths after readiness. Refs #75283 and #75069. Thanks @brokemac79 and @xiaohuaxi.
diff --git a/src/plugin-sdk/compat.ts b/src/plugin-sdk/compat.ts
index 62648b419d8..508fc74b881 100644
--- a/src/plugin-sdk/compat.ts
+++ b/src/plugin-sdk/compat.ts
@@ -4,6 +4,21 @@
  * instead.
  */
 
+import {
+  createChannelReplyPipeline as createChannelReplyPipelineCompat,
+  createReplyPrefixContext as createReplyPrefixContextCompat,
+  createReplyPrefixOptions as createReplyPrefixOptionsCompat,
+  createTypingCallbacks as createTypingCallbacksCompat,
+  resolveChannelSourceReplyDeliveryMode as resolveChannelSourceReplyDeliveryModeCompat,
+  type ChannelReplyPipeline as ChannelReplyPipelineCompat,
+  type CreateTypingCallbacksParams as CreateTypingCallbacksParamsCompat,
+  type ReplyPrefixContext as ReplyPrefixContextCompat,
+  type ReplyPrefixContextBundle as ReplyPrefixContextBundleCompat,
+  type ReplyPrefixOptions as ReplyPrefixOptionsCompat,
+  type SourceReplyDeliveryMode as SourceReplyDeliveryModeCompat,
+  type TypingCallbacks as TypingCallbacksCompat,
+} from "./channel-reply-pipeline.js";
+
 const shouldWarnCompatImport =
   process.env.VITEST !== "true" &&
   process.env.NODE_ENV !== "test" &&
@@ -69,6 +84,31 @@ export * from "./reply-history.js";
 export * from "./directory-runtime.js";
 export { mapAllowlistResolutionInputs } from "./allow-from.js";
 
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export const createChannelReplyPipeline = createChannelReplyPipelineCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export const createReplyPrefixContext = createReplyPrefixContextCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export const createReplyPrefixOptions = createReplyPrefixOptionsCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export const createTypingCallbacks = createTypingCallbacksCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export const resolveChannelSourceReplyDeliveryMode = resolveChannelSourceReplyDeliveryModeCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type ChannelReplyPipeline = ChannelReplyPipelineCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type CreateTypingCallbacksParams = CreateTypingCallbacksParamsCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type ReplyPrefixContext = ReplyPrefixContextCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type ReplyPrefixContextBundle = ReplyPrefixContextBundleCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type ReplyPrefixOptions = ReplyPrefixOptionsCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type SourceReplyDeliveryMode = SourceReplyDeliveryModeCompat;
+/** @deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`. */
+export type TypingCallbacks = TypingCallbacksCompat;
+
 export {
   resolveBlueBubblesGroupRequireMention,
   resolveBlueBubblesGroupToolPolicy,
diff --git a/src/plugins/compat/registry.test.ts b/src/plugins/compat/registry.test.ts
index 4b25ceceb16..a314093f9bd 100644
--- a/src/plugins/compat/registry.test.ts
+++ b/src/plugins/compat/registry.test.ts
@@ -130,6 +130,11 @@ const knownDeprecatedSurfaceMarkers = [
     file: "src/plugin-sdk/testing.ts",
     marker: "@deprecated Broad compatibility barrel",
   },
+  {
+    code: "legacy-root-sdk-import",
+    file: "src/plugin-sdk/compat.ts",
+    marker: "@deprecated Use `openclaw/plugin-sdk/channel-reply-pipeline`.",
+  },
   {
     code: "channel-route-key-aliases",
     file: "src/plugin-sdk/channel-route.ts",
diff --git a/src/plugins/compat/registry.ts b/src/plugins/compat/registry.ts
index a5eddfaaf6e..0a8966c95f3 100644
--- a/src/plugins/compat/registry.ts
+++ b/src/plugins/compat/registry.ts
@@ -48,6 +48,7 @@ export const PLUGIN_COMPAT_RECORDS = [
     diagnostics: ["OPENCLAW_PLUGIN_SDK_COMPAT_DEPRECATED"],
     tests: [
       "src/plugins/contracts/plugin-sdk-index.test.ts",
+      "src/plugins/contracts/plugin-sdk-root-alias.test.ts",
       "src/plugins/contracts/plugin-sdk-subpaths.test.ts",
     ],
   },
diff --git a/src/plugins/contracts/plugin-sdk-root-alias.test.ts b/src/plugins/contracts/plugin-sdk-root-alias.test.ts
index fa20417892f..6f5fde93fe2 100644
--- a/src/plugins/contracts/plugin-sdk-root-alias.test.ts
+++ b/src/plugins/contracts/plugin-sdk-root-alias.test.ts
@@ -468,6 +468,11 @@ describe("plugin-sdk root alias", () => {
     expect(typeof rootSdk.stringEnum).toBe("function");
     expect(typeof rootSdk.buildChannelConfigSchema).toBe("function");
     expect(typeof rootSdk.normalizeAccountId).toBe("function");
+    expect(typeof rootSdk.createReplyPrefixContext).toBe("function");
+    expect(typeof rootSdk.createReplyPrefixOptions).toBe("function");
+    expect(typeof rootSdk.createTypingCallbacks).toBe("function");
+    expect(typeof rootSdk.createChannelReplyPipeline).toBe("function");
+    expect(typeof rootSdk.resolveChannelSourceReplyDeliveryMode).toBe("function");
     expect(typeof rootSdk.resolvePreferredOpenClawTmpDir).toBe("function");
     expect(typeof rootSdk.default).toBe("object");
     expect(rootSdk.default).toBe(rootSdk);
diff --git a/src/plugins/contracts/plugin-sdk-subpaths.test.ts b/src/plugins/contracts/plugin-sdk-subpaths.test.ts
index e04e7e3cc1e..0cdc5bdc203 100644
--- a/src/plugins/contracts/plugin-sdk-subpaths.test.ts
+++ b/src/plugins/contracts/plugin-sdk-subpaths.test.ts
@@ -643,6 +643,8 @@ describe("plugin-sdk subpath exports", () => {
       "collectOpenGroupPolicyConfiguredRouteWarnings",
       "resolveControlCommandGate",
       "delegateCompactionToRuntime",
+      "createReplyPrefixContext",
+      "createChannelReplyPipeline",
     ]);
     expectSourceMentions("device-bootstrap", [
       "approveDevicePairing",