diff --git a/sdk/typescript/tests/testCodex.ts b/sdk/typescript/tests/testCodex.ts
index d73b519b6..a4cac8b14 100644
--- a/sdk/typescript/tests/testCodex.ts
+++ b/sdk/typescript/tests/testCodex.ts
@@ -44,33 +44,43 @@ export function createTestClient(options: CreateTestClientOptions = {}): TestCli
       codexPathOverride: codexExecPath,
       baseUrl: options.baseUrl,
       apiKey: options.apiKey,
-      config: mergeTestProviderConfig(options.baseUrl, options.config),
+      config: mergeTestConfig(options.baseUrl, options.config),
       env,
     }),
   };
 }
 
-function mergeTestProviderConfig(
+function mergeTestConfig(
   baseUrl: string | undefined,
   config: CodexConfigObject | undefined,
 ): CodexConfigObject | undefined {
-  if (!baseUrl || hasExplicitProviderConfig(config)) {
-    return config;
-  }
+  const mergedConfig: CodexConfigObject | undefined =
+    !baseUrl || hasExplicitProviderConfig(config)
+      ? config
+      : {
+          ...config,
+          // Built-in providers are merged before user config, so tests need a
+          // custom provider entry to force SSE against the local mock server.
+          model_provider: "mock",
+          model_providers: {
+            mock: {
+              name: "Mock provider for test",
+              base_url: baseUrl,
+              wire_api: "responses",
+              supports_websockets: false,
+            },
+          },
+        };
+  const featureOverrides = mergedConfig?.features;
 
-  // Built-in providers are merged before user config, so tests need a custom
-  // provider entry to force SSE against the local mock server.
   return {
-    ...config,
-    model_provider: "mock",
-    model_providers: {
-      mock: {
-        name: "Mock provider for test",
-        base_url: baseUrl,
-        wire_api: "responses",
-        supports_websockets: false,
-      },
-    },
+    ...mergedConfig,
+    // Disable plugins in SDK integration tests so background curated-plugin
+    // sync does not race temp CODEX_HOME cleanup.
+    features:
+      featureOverrides && typeof featureOverrides === "object" && !Array.isArray(featureOverrides)
+        ? { ...featureOverrides, plugins: false }
+        : { plugins: false },
   };
 }