diff --git a/extensions/elevenlabs/speech-provider.ts b/extensions/elevenlabs/speech-provider.ts
index f01a908f283..0b1b8903c24 100644
--- a/extensions/elevenlabs/speech-provider.ts
+++ b/extensions/elevenlabs/speech-provider.ts
@@ -7,10 +7,12 @@ import type {
   SpeechVoiceOption,
 } from "openclaw/plugin-sdk/speech";
 import {
+  asObject,
   normalizeApplyTextNormalization,
   normalizeLanguageCode,
   normalizeSeed,
   requireInRange,
+  trimToUndefined,
 } from "openclaw/plugin-sdk/speech";
 import { resolveElevenLabsApiKeyWithProfileFallback } from "./config-api.js";
 import { elevenLabsTTS } from "./tts.js";
@@ -49,10 +51,6 @@ type ElevenLabsProviderConfig = {
   };
 };
 
-function trimToUndefined(value: unknown): string | undefined {
-  return typeof value === "string" && value.trim() ? value.trim() : undefined;
-}
-
 function asNumber(value: unknown): number | undefined {
   return typeof value === "number" && Number.isFinite(value) ? value : undefined;
 }
@@ -61,12 +59,6 @@ function asBoolean(value: unknown): boolean | undefined {
   return typeof value === "boolean" ? value : undefined;
 }
 
-function asObject(value: unknown): Record<string, unknown> | undefined {
-  return typeof value === "object" && value !== null && !Array.isArray(value)
-    ? (value as Record<string, unknown>)
-    : undefined;
-}
-
 function parseBooleanValue(value: string): boolean | undefined {
   const normalized = value.trim().toLowerCase();
   if (["true", "1", "yes", "on"].includes(normalized)) {
diff --git a/extensions/microsoft/speech-provider.ts b/extensions/microsoft/speech-provider.ts
index 897dd902697..16f79051122 100644
--- a/extensions/microsoft/speech-provider.ts
+++ b/extensions/microsoft/speech-provider.ts
@@ -11,6 +11,7 @@ import type {
   SpeechProviderPlugin,
   SpeechVoiceOption,
 } from "openclaw/plugin-sdk/speech";
+import { asObject, trimToUndefined } from "openclaw/plugin-sdk/speech";
 import { resolvePreferredOpenClawTmpDir } from "openclaw/plugin-sdk/temp-path";
 import { edgeTTS, inferEdgeExtension } from "./tts.js";
 
@@ -43,10 +44,6 @@ type MicrosoftVoiceListEntry = {
   };
 };
 
-function trimToUndefined(value: unknown): string | undefined {
-  return typeof value === "string" && value.trim() ? value.trim() : undefined;
-}
-
 function asBoolean(value: unknown): boolean | undefined {
   return typeof value === "boolean" ? value : undefined;
 }
@@ -55,12 +52,6 @@ function asNumber(value: unknown): number | undefined {
   return typeof value === "number" && Number.isFinite(value) ? value : undefined;
 }
 
-function asObject(value: unknown): Record<string, unknown> | undefined {
-  return typeof value === "object" && value !== null && !Array.isArray(value)
-    ? (value as Record<string, unknown>)
-    : undefined;
-}
-
 function normalizeMicrosoftProviderConfig(
   rawConfig: Record<string, unknown>,
 ): MicrosoftProviderConfig {
diff --git a/extensions/minimax/speech-provider.ts b/extensions/minimax/speech-provider.ts
index 475f460f822..3cffdfba3a2 100644
--- a/extensions/minimax/speech-provider.ts
+++ b/extensions/minimax/speech-provider.ts
@@ -5,6 +5,7 @@ import type {
   SpeechProviderOverrides,
   SpeechProviderPlugin,
 } from "openclaw/plugin-sdk/speech-core";
+import { asObject, trimToUndefined } from "openclaw/plugin-sdk/speech-core";
 import {
   DEFAULT_MINIMAX_TTS_BASE_URL,
   MINIMAX_TTS_MODELS,
@@ -31,20 +32,10 @@ type MinimaxTtsProviderOverrides = {
   pitch?: number;
 };
 
-function trimToUndefined(value: unknown): string | undefined {
-  return typeof value === "string" && value.trim() ? value.trim() : undefined;
-}
-
 function asNumber(value: unknown): number | undefined {
   return typeof value === "number" && Number.isFinite(value) ? value : undefined;
 }
 
-function asObject(value: unknown): Record<string, unknown> | undefined {
-  return typeof value === "object" && value !== null && !Array.isArray(value)
-    ? (value as Record<string, unknown>)
-    : undefined;
-}
-
 function normalizeMinimaxProviderConfig(
   rawConfig: Record<string, unknown>,
 ): MinimaxTtsProviderConfig {
diff --git a/extensions/vydra/speech-provider.ts b/extensions/vydra/speech-provider.ts
index fe3c787f06e..a45f0ec68a3 100644
--- a/extensions/vydra/speech-provider.ts
+++ b/extensions/vydra/speech-provider.ts
@@ -9,6 +9,7 @@ import type {
   SpeechProviderOverrides,
   SpeechProviderPlugin,
 } from "openclaw/plugin-sdk/speech-core";
+import { asObject } from "openclaw/plugin-sdk/speech-core";
 import {
   DEFAULT_VYDRA_BASE_URL,
   DEFAULT_VYDRA_SPEECH_MODEL,
@@ -33,12 +34,6 @@ const VYDRA_SPEECH_VOICES = [
   },
 ] as const;
 
-function asObject(value: unknown): Record<string, unknown> | undefined {
-  return typeof value === "object" && value !== null && !Array.isArray(value)
-    ? (value as Record<string, unknown>)
-    : undefined;
-}
-
 function normalizeVydraSpeechConfig(rawConfig: Record<string, unknown>): VydraSpeechConfig {
   const providers = asObject(rawConfig.providers);
   const raw = asObject(providers?.vydra) ?? asObject(rawConfig.vydra);
diff --git a/src/plugin-sdk/speech-core.ts b/src/plugin-sdk/speech-core.ts
index 105495885d9..d10295d6f94 100644
--- a/src/plugin-sdk/speech-core.ts
+++ b/src/plugin-sdk/speech-core.ts
@@ -35,3 +35,9 @@ export {
   normalizeSpeechProviderId,
 } from "../tts/provider-registry.js";
 export { normalizeTtsAutoMode, TTS_AUTO_MODES } from "../tts/tts-auto-mode.js";
+export {
+  asObject,
+  readResponseTextLimited,
+  trimToUndefined,
+  truncateErrorDetail,
+} from "../tts/provider-error-utils.js";