diff --git a/extensions/parallel/src/parallel-mcp-search.runtime.test.ts b/extensions/parallel/src/parallel-mcp-search.runtime.test.ts
index f84e2661f1b6..e76e37ba8c78 100644
--- a/extensions/parallel/src/parallel-mcp-search.runtime.test.ts
+++ b/extensions/parallel/src/parallel-mcp-search.runtime.test.ts
@@ -44,6 +44,28 @@ function jsonResponse(body: unknown, headers?: Record<string, string>): Response
   });
 }
 
+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,
+  };
+}
+
 function readBody(call: EndpointCall): Record<string, unknown> {
   if (typeof call.init.body !== "string") {
     throw new Error("Expected a JSON string body.");
@@ -270,4 +292,23 @@ describe("runParallelMcpSearch", () => {
       /initialize failed \(500\)/,
     );
   });
+
+  it("bounds initialize error bodies without using response.text()", async () => {
+    const tracked = cancelTrackedResponse(`${"parallel mcp unavailable ".repeat(1024)}tail`, {
+      status: 503,
+      headers: { "Content-Type": "text/plain" },
+    });
+    const textSpy = vi.spyOn(tracked.response, "text").mockRejectedValue(new Error("unbounded"));
+    endpointMockState.responses.push(tracked.response);
+
+    const error = await runParallelMcpSearch({ searchQueries: ["x"], maxResults: 5 }).catch(
+      (cause: unknown) => cause,
+    );
+
+    expect(error).toBeInstanceOf(Error);
+    expect((error as Error).message).toMatch(/initialize failed \(503\): parallel mcp unavailable/);
+    expect((error as Error).message).not.toContain("tail");
+    expect(tracked.wasCanceled()).toBe(true);
+    expect(textSpy).not.toHaveBeenCalled();
+  });
 });
diff --git a/extensions/parallel/src/parallel-mcp-search.runtime.ts b/extensions/parallel/src/parallel-mcp-search.runtime.ts
index 989ee7f24120..0b0031f3a09a 100644
--- a/extensions/parallel/src/parallel-mcp-search.runtime.ts
+++ b/extensions/parallel/src/parallel-mcp-search.runtime.ts
@@ -1,6 +1,7 @@
 import { randomUUID } from "node:crypto";
 import { createRequire } from "node:module";
 import { readPluginPackageVersion } from "openclaw/plugin-sdk/extension-shared";
+import { readResponseTextLimited } from "openclaw/plugin-sdk/provider-http";
 import { withTrustedWebSearchEndpoint } from "openclaw/plugin-sdk/provider-web-search";
 
 // Free hosted Search MCP. This keyless transport is used only after the user
@@ -11,6 +12,7 @@ export const PARALLEL_MCP_SEARCH_URL = "https://search.parallel.ai/mcp";
 // the server negotiates back on every follow-up request.
 const MCP_PROTOCOL_VERSION = "2025-06-18";
 const MCP_TIMEOUT_SECONDS = 30;
+const PARALLEL_MCP_ERROR_BODY_LIMIT_BYTES = 8 * 1024;
 
 const require = createRequire(import.meta.url);
 const PLUGIN_VERSION = readPluginPackageVersion({ require });
@@ -215,7 +217,9 @@ async function postMcp(params: {
       ok: response.ok,
       status: response.status,
       statusText: response.statusText,
-      text: await response.text(),
+      text: response.ok
+        ? await response.text()
+        : await readResponseTextLimited(response, PARALLEL_MCP_ERROR_BODY_LIMIT_BYTES),
       sessionIdHeader: response.headers.get("mcp-session-id"),
     }),
   );
diff --git a/extensions/parallel/src/parallel-web-search-provider.runtime.ts b/extensions/parallel/src/parallel-web-search-provider.runtime.ts
index 0152bd816953..b55f2bc334ca 100644
--- a/extensions/parallel/src/parallel-web-search-provider.runtime.ts
+++ b/extensions/parallel/src/parallel-web-search-provider.runtime.ts
@@ -1,5 +1,6 @@
 import { createRequire } from "node:module";
 import { readPluginPackageVersion } from "openclaw/plugin-sdk/extension-shared";
+import { readResponseTextLimited } from "openclaw/plugin-sdk/provider-http";
 import {
   DEFAULT_SEARCH_COUNT,
   mergeScopedSearchConfig,
@@ -34,6 +35,7 @@ import {
 
 const PARALLEL_BASE_URL = "https://api.parallel.ai";
 const PARALLEL_SEARCH_PATHNAME = "/v1/search";
+const PARALLEL_ERROR_BODY_LIMIT_BYTES = 8 * 1024;
 
 const require = createRequire(import.meta.url);
 const PLUGIN_VERSION = readPluginPackageVersion({ require });
@@ -144,7 +146,9 @@ async function runParallelSearch(params: {
     },
     async (res) => {
       if (!res.ok) {
-        const detail = await res.text().catch(() => "");
+        const detail = await readResponseTextLimited(res, PARALLEL_ERROR_BODY_LIMIT_BYTES).catch(
+          () => "",
+        );
         throw new Error(`Parallel API error (${res.status}): ${detail || res.statusText}`);
       }
       try {
@@ -277,6 +281,7 @@ export const testing = {
   resolveParallelConfig,
   resolveParallelSearchCount,
   resolveParallelSearchEndpoint,
+  PARALLEL_ERROR_BODY_LIMIT_BYTES,
   USER_AGENT,
 } as const;
 
diff --git a/extensions/parallel/src/parallel-web-search-provider.test.ts b/extensions/parallel/src/parallel-web-search-provider.test.ts
index 3670eb5bef02..c9d7fbe00453 100644
--- a/extensions/parallel/src/parallel-web-search-provider.test.ts
+++ b/extensions/parallel/src/parallel-web-search-provider.test.ts
@@ -37,6 +37,28 @@ function readMockedBody(call: EndpointCall | undefined): unknown {
   return JSON.parse(call.init.body);
 }
 
+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,
+  };
+}
+
 import { testing } from "../test-api.js";
 import { createParallelWebSearchProvider as createContractParallelWebSearchProvider } from "../web-search-contract-api.js";
 import { createParallelWebSearchProvider } from "./parallel-web-search-provider.js";
@@ -529,6 +551,38 @@ describe("parallel web search provider", () => {
     expect(body.advanced_settings?.max_results).toBe(5);
   });
 
+  it("bounds Parallel API error bodies without using response.text()", async () => {
+    const tracked = cancelTrackedResponse(`${"parallel upstream unavailable ".repeat(1024)}tail`, {
+      status: 503,
+      headers: { "Content-Type": "text/plain" },
+    });
+    const textSpy = vi.spyOn(tracked.response, "text").mockRejectedValue(new Error("unbounded"));
+    endpointMockState.responses.push(tracked.response);
+    const provider = createParallelWebSearchProvider();
+    const tool = provider.createTool({
+      config: {},
+      searchConfig: { parallel: { apiKey: "par-secret" } },
+    });
+    if (!tool) {
+      throw new Error("Expected tool definition");
+    }
+
+    const error = await tool
+      .execute({
+        objective: `parallel-error-body-${Date.now()}`,
+        search_queries: ["openclaw"],
+      })
+      .catch((cause: unknown) => cause);
+
+    expect(error).toBeInstanceOf(Error);
+    expect((error as Error).message).toMatch(
+      /Parallel API error \(503\): parallel upstream unavailable/,
+    );
+    expect((error as Error).message).not.toContain("tail");
+    expect(tracked.wasCanceled()).toBe(true);
+    expect(textSpy).not.toHaveBeenCalled();
+  });
+
   it("does not surface a Parallel-generated sessionId on a cache hit", async () => {
     // Unique objective so this test does not collide with the SDK's
     // module-level web-search cache across other cases.