diff --git a/src/integrations/state.ts b/src/integrations/state.ts
index 0249987027..193281876d 100644
--- a/src/integrations/state.ts
+++ b/src/integrations/state.ts
@@ -437,10 +437,11 @@ export function exportContextOf(input: {
      * `http://::1:10100/v1` and `::` produced `http://:::10100/v1`, neither of
      * which is a URL, and a `0.0.0.0` bind wrote a wildcard address no client
      * can dial. `opencodeProxyBaseUrl` brackets IPv6 and maps wildcards to
-     * loopback, and every client we write into deserves the same answer the
-     * export command already gives.
+     * loopback. Managed integrations must stay on the public listener, though:
+     * the optional unauthenticated listener only exposes Codex's Responses
+     * routes, while these clients can use Chat Completions or Messages.
      */
-    baseUrl: opencodeProxyBaseUrl(input.port, input.config.hostname, input.config),
+    baseUrl: opencodeProxyBaseUrl(input.port, input.config.hostname),
     models: input.models,
     config: input.config,
   };
diff --git a/src/integrations/writer.ts b/src/integrations/writer.ts
index 514fbc3220..eeed5b4058 100644
--- a/src/integrations/writer.ts
+++ b/src/integrations/writer.ts
@@ -12,7 +12,7 @@
 import { homedir } from "node:os";
 import { dirname } from "node:path";
 import { EXPORT_CLIENTS, type ExportModel, type ManagedContribution } from "../clients/config-export";
-import { shouldInjectApiAuthHeader } from "../codex/inject";
+import { isLoopbackHostname } from "../codex/inject";
 import type { OcxConfig } from "../types";
 import { PARSE_FAILED, defaultIntegrationIO, loadTarget, parseConfig, type IntegrationIO } from "./config-io";
 import {
@@ -290,7 +290,7 @@ function applyOrRefreshIntegration(
   if (io.statKind(detectDir) !== "dir") {
     return refuse(clientId, "not_installed", "absent", `${clientId} is not installed`);
   }
-  if (isLoopbackOnly(clientId) && shouldInjectApiAuthHeader(input.config)) {
+  if (isLoopbackOnly(clientId) && !isLoopbackHostname(input.config.hostname)) {
     return refuse(clientId, "non_loopback", classified.state,
       `The generated ${clientId} integration is loopback-only and does not emit the admission header a non-loopback bind requires. Give it loopback access instead, through a tunnel or a local forwarder.`);
   }
diff --git a/tests/clients/integrations-writer.test.ts b/tests/clients/integrations-writer.test.ts
index de2f164710..65b77dadc5 100644
--- a/tests/clients/integrations-writer.test.ts
+++ b/tests/clients/integrations-writer.test.ts
@@ -1,5 +1,5 @@
 import { afterEach, beforeEach, describe, expect, test } from "bun:test";
-import { mkdirSync, mkdtempSync, readFileSync, rmSync, statSync, writeFileSync } from "node:fs";
+import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, statSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { dirname, join } from "node:path";
 import { buildClientContribution, type ExportModel } from "../../src/clients/config-export";
@@ -378,7 +378,7 @@ describe("apply", () => {
     expect(after.provider.opencodex!.models["mystery/model"]!.limit).toBeUndefined();
   });
 
-  test("ZCode on a hub writes and recognizes the unauthenticated loopback listener (#3306)", () => {
+  test("ZCode on a hub refuses the Responses-only unauthenticated listener", () => {
     const configPath = installZcode();
     const request = input({
       clientId: "zcode",
@@ -391,16 +391,9 @@ describe("apply", () => {
     });
 
     const result = applyIntegration(request);
-    expect(result.ok).toBe(true);
-
-    const document = JSON.parse(readFileSync(configPath, "utf8")) as {
-      provider: Record<string, { options: { apiKey: string; baseURL: string } }>;
-    };
-    expect(document.provider.opencodex!.options).toMatchObject({
-      apiKey: "opencodex-loopback",
-      baseURL: "http://127.0.0.1:10102/v1",
-    });
-    expect(readIntegrationState(request)).toMatchObject({ state: "current" });
+    expect(result).toMatchObject({ ok: false, reason: "non_loopback" });
+    expect(existsSync(configPath)).toBe(false);
+    expect(exportContextOf(request).baseUrl).toBe("http://100.64.0.10:10100/v1");
   });
 
   test("ZCode key-order normalization stays refreshable with derived metadata (#2759)", () => {