diff --git a/extensions/discord/src/pluralkit.test.ts b/extensions/discord/src/pluralkit.test.ts
index b5141b8ba42f..c86039979cab 100644
--- a/extensions/discord/src/pluralkit.test.ts
+++ b/extensions/discord/src/pluralkit.test.ts
@@ -7,6 +7,8 @@ type MockResponse = {
   ok: boolean;
   text: () => Promise<string>;
   json: () => Promise<unknown>;
+  body: null;
+  arrayBuffer: () => Promise<Buffer>;
 };
 
 const buildResponse = (params: { status: number; body?: unknown }): MockResponse => {
@@ -17,6 +19,8 @@ const buildResponse = (params: { status: number; body?: unknown }): MockResponse
     ok: params.status >= 200 && params.status < 300,
     text: async () => textPayload,
     json: async () => body ?? {},
+    body: null,
+    arrayBuffer: async () => Buffer.from(textPayload),
   };
 };
 
diff --git a/extensions/discord/src/pluralkit.ts b/extensions/discord/src/pluralkit.ts
index 1e24a4fef672..5535b68a2f09 100644
--- a/extensions/discord/src/pluralkit.ts
+++ b/extensions/discord/src/pluralkit.ts
@@ -1,6 +1,9 @@
 // Discord plugin module implements pluralkit behavior.
 import { resolveFetch } from "openclaw/plugin-sdk/fetch-runtime";
-import { readResponseTextLimited } from "openclaw/plugin-sdk/provider-http";
+import {
+  readProviderJsonResponse,
+  readResponseTextLimited,
+} from "openclaw/plugin-sdk/provider-http";
 
 const PLURALKIT_API_BASE = "https://api.pluralkit.me/v2";
 const PLURALKIT_ERROR_BODY_LIMIT_BYTES = 8 * 1024;
@@ -59,5 +62,5 @@ export async function fetchPluralKitMessageInfo(params: {
     const detail = text.trim() ? `: ${text.trim()}` : "";
     throw new Error(`PluralKit API failed (${res.status})${detail}`);
   }
-  return (await res.json()) as PluralKitMessageInfo;
+  return await readProviderJsonResponse<PluralKitMessageInfo>(res, "PluralKit message");
 }
diff --git a/extensions/discord/src/voice-message.ts b/extensions/discord/src/voice-message.ts
index 740a8ed7f291..aba240e467a2 100644
--- a/extensions/discord/src/voice-message.ts
+++ b/extensions/discord/src/voice-message.ts
@@ -22,7 +22,11 @@ import {
 import { MEDIA_FFMPEG_MAX_AUDIO_DURATION_SECS } from "openclaw/plugin-sdk/media-runtime";
 import { unlinkIfExists } from "openclaw/plugin-sdk/media-runtime";
 import { parseStrictFiniteNumber } from "openclaw/plugin-sdk/number-runtime";
-import { readResponseTextLimited } from "openclaw/plugin-sdk/provider-http";
+import {
+  readProviderJsonResponse,
+  readResponseTextLimited,
+} from "openclaw/plugin-sdk/provider-http";
+import type { RetryRunner } from "openclaw/plugin-sdk/retry-runtime";
 import { writeExternalFileWithinRoot } from "openclaw/plugin-sdk/security-runtime";
 import { fetchWithSsrFGuard, type SsrFPolicy } from "openclaw/plugin-sdk/ssrf-runtime";
 import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
@@ -352,7 +356,7 @@ async function requestVoiceUploadUrl(params: {
     if (!res.ok) {
       throw await createVoiceRequestError(res, "Upload URL request failed");
     }
-    return (await res.json()) as UploadUrlResponse;
+    return await readProviderJsonResponse<UploadUrlResponse>(res, "discord.voice.upload-url");
   } finally {
     await release();
   }