diff --git a/extensions/ollama/src/stream-runtime.test.ts b/extensions/ollama/src/stream-runtime.test.ts
index 081999e189a5..c16559068c3b 100644
--- a/extensions/ollama/src/stream-runtime.test.ts
+++ b/extensions/ollama/src/stream-runtime.test.ts
@@ -1534,6 +1534,28 @@ function getGuardedFetchCall(fetchMock: typeof fetchWithSsrFGuardMock): GuardedF
   return (fetchMock.mock.calls.at(0)?.[0] as GuardedFetchCall | undefined) ?? { url: "" };
 }
 
+function cancelTrackedResponse(
+  text: string,
+  init: ResponseInit,
+): {
+  response: Response;
+  wasCanceled: () => boolean;
+} {
+  let canceled = false;
+  const stream = new ReadableStream<Uint8Array>({
+    start(controller) {
+      controller.enqueue(new TextEncoder().encode(text));
+    },
+    cancel() {
+      canceled = true;
+    },
+  });
+  return {
+    response: new Response(stream, init),
+    wasCanceled: () => canceled,
+  };
+}
+
 async function createOllamaTestStream(params: {
   baseUrl: string;
   defaultHeaders?: Record<string, string>;
@@ -2684,12 +2706,14 @@ describe("createOllamaStreamFn", () => {
     );
   });
 
-  it("surfaces non-2xx HTTP response as status-prefixed error", async () => {
+  it("surfaces bounded non-2xx HTTP response text as a status-prefixed error", async () => {
+    const tracked = cancelTrackedResponse(`${"Service Unavailable ".repeat(1024)}tail`, {
+      status: 503,
+      statusText: "Service Unavailable",
+    });
+    const textSpy = vi.spyOn(tracked.response, "text").mockRejectedValue(new Error("unbounded"));
     fetchWithSsrFGuardMock.mockResolvedValue({
-      response: new Response("Service Unavailable", {
-        status: 503,
-        statusText: "Service Unavailable",
-      }),
+      response: tracked.response,
       release: vi.fn(async () => undefined),
     });
     try {
@@ -2705,6 +2729,10 @@ describe("createOllamaStreamFn", () => {
       // The error message must start with the HTTP status code so that
       // extractLeadingHttpStatus can parse it for failover/retry logic.
       expect(errorEvent.error.errorMessage).toMatch(/^503\b/);
+      expect(errorEvent.error.errorMessage).toContain("Service Unavailable");
+      expect(errorEvent.error.errorMessage).not.toContain("tail");
+      expect(tracked.wasCanceled()).toBe(true);
+      expect(textSpy).not.toHaveBeenCalled();
     } finally {
       fetchWithSsrFGuardMock.mockReset();
     }
diff --git a/extensions/ollama/src/stream.ts b/extensions/ollama/src/stream.ts
index d271921b7117..2143ddca7c48 100644
--- a/extensions/ollama/src/stream.ts
+++ b/extensions/ollama/src/stream.ts
@@ -18,6 +18,7 @@ import type {
   ProviderWrapStreamFnContext,
 } from "openclaw/plugin-sdk/plugin-entry";
 import { isNonSecretApiKeyMarker } from "openclaw/plugin-sdk/provider-auth";
+import { readResponseTextLimited } from "openclaw/plugin-sdk/provider-http";
 import {
   DEFAULT_CONTEXT_TOKENS,
   normalizeProviderId,
@@ -54,6 +55,7 @@ export const OLLAMA_NATIVE_BASE_URL = OLLAMA_DEFAULT_BASE_URL;
 
 const OLLAMA_STREAM_COOPERATIVE_YIELD_INTERVAL_MS = 12;
 const OLLAMA_STREAM_COOPERATIVE_YIELD_MAX_EVENTS = 64;
+const OLLAMA_STREAM_ERROR_BODY_LIMIT_BYTES = 8 * 1024;
 const GARBLED_VISIBLE_TEXT_MODEL_RE = /\b(?:glm|kimi)\b/i;
 const GARBLED_VISIBLE_TEXT_MIN_CHARS = 80;
 const GARBLED_VISIBLE_TEXT_SYMBOL_RE = /[$#%&="'_~`^|\\/*+\-[\]{}()<>:;,.!?]/gu;
@@ -1211,7 +1213,10 @@ function createRawOllamaStreamFn(
 
         try {
           if (!response.ok) {
-            const errorText = await response.text().catch(() => "unknown error");
+            const errorText = await readResponseTextLimited(
+              response,
+              OLLAMA_STREAM_ERROR_BODY_LIMIT_BYTES,
+            ).catch(() => "unknown error");
             throw new Error(`${response.status} ${errorText}`);
           }
           if (!response.body) {