diff --git a/docs/.generated/plugin-sdk-api-baseline.sha256 b/docs/.generated/plugin-sdk-api-baseline.sha256
index 273b5e4ee9e..26ce037c324 100644
--- a/docs/.generated/plugin-sdk-api-baseline.sha256
+++ b/docs/.generated/plugin-sdk-api-baseline.sha256
@@ -1,2 +1,2 @@
-1fb6adb8edadd5ec27c0c4866478f6919bc33ce38816d28f3548fc7cac9dacb9  plugin-sdk-api-baseline.json
-0840e1f2a59b8b660f58ab1810dc333b6b535e3235fdbb377da6f1e913fb1a87  plugin-sdk-api-baseline.jsonl
+4e36981eb12b201f14b9d94ba44ab23793ed7555b2d736c1f477aeeb02e9ab9c  plugin-sdk-api-baseline.json
+8228f54b594b2462b1454c5c43c165ca8a57bec10da5b991fb4b3ba65427f61d  plugin-sdk-api-baseline.jsonl
diff --git a/docs/plugins/sdk-subpaths.md b/docs/plugins/sdk-subpaths.md
index 4976e76fa3d..8abaf8be106 100644
--- a/docs/plugins/sdk-subpaths.md
+++ b/docs/plugins/sdk-subpaths.md
@@ -258,7 +258,7 @@ For the plugin authoring guide, see [Plugin SDK overview](/plugins/sdk-overview)
     | `plugin-sdk/webhook-path` | Webhook path normalization helpers |
     | `plugin-sdk/web-media` | Shared remote/local media loading helpers |
     | `plugin-sdk/zod` | Re-exported `zod` for plugin SDK consumers |
-    | `plugin-sdk/testing` | Public extension test helpers including plugin registry/runtime mocks, schema/media/live-test helpers, `installCommonResolveTargetErrorCases`, `writeSkill`, `createTestRegistry`, and live generation env loading. Extension `*.test-support.ts` helpers stay on this or focused SDK subpaths, not core internals |
+    | `plugin-sdk/testing` | Public extension test helpers including plugin registry/runtime mocks, fetch/env/temp fixtures, schema/media/live-test helpers, `installCommonResolveTargetErrorCases`, `writeSkill`, `createTestRegistry`, and live generation env loading. Extension `*.test-support.ts` helpers stay on this or focused SDK subpaths, not core internals |
   </Accordion>
 
   <Accordion title="Memory subpaths">
diff --git a/docs/plugins/sdk-testing.md b/docs/plugins/sdk-testing.md
index ad012088f75..bbc04863134 100644
--- a/docs/plugins/sdk-testing.md
+++ b/docs/plugins/sdk-testing.md
@@ -38,6 +38,17 @@ import {
 | `installCommonResolveTargetErrorCases` | Shared test cases for target resolution error handling |
 | `shouldAckReaction`                    | Check whether a channel should add an ack reaction     |
 | `removeAckReactionAfterReply`          | Remove ack reaction after reply delivery               |
+| `createTestRegistry`                   | Build a channel plugin registry fixture                |
+| `createEmptyPluginRegistry`            | Build an empty plugin registry fixture                 |
+| `setActivePluginRegistry`              | Install a registry fixture for plugin runtime tests    |
+| `createRequestCaptureJsonFetch`        | Capture JSON fetch requests in media helper tests      |
+| `withFetchPreconnect`                  | Run fetch tests with preconnect hooks installed        |
+| `withEnv` / `withEnvAsync`             | Temporarily patch environment variables                |
+| `createTempHomeEnv` / `withTempDir`    | Create isolated filesystem test fixtures               |
+| `createMockServerResponse`             | Create a minimal HTTP server response mock             |
+| `registerSingleProviderPlugin`         | Register one provider plugin in loader smoke tests     |
+| `createRuntimeTaskFlow`                | Create isolated runtime task-flow state                |
+| `typedCases`                           | Preserve literal types for table-driven tests          |
 
 ### Types
 
diff --git a/scripts/check-no-extension-test-core-imports.ts b/scripts/check-no-extension-test-core-imports.ts
index 2669a77c7ac..64fa17b9788 100644
--- a/scripts/check-no-extension-test-core-imports.ts
+++ b/scripts/check-no-extension-test-core-imports.ts
@@ -43,6 +43,19 @@ const MOCK_RELATIVE_MODULE_PATTERN =
 const RELATIVE_CORE_HINT =
   "Use openclaw/plugin-sdk/testing or a focused plugin-sdk test/runtime subpath instead of core internals.";
 
+const EXTENSION_TEST_HELPER_BRIDGE_FILES = [
+  "test/helpers/plugins/env.ts",
+  "test/helpers/plugins/fetch-mock.ts",
+  "test/helpers/plugins/media-understanding.ts",
+  "test/helpers/plugins/mock-http-response.ts",
+  "test/helpers/plugins/plugin-registration.ts",
+  "test/helpers/plugins/plugin-registry.ts",
+  "test/helpers/plugins/runtime-taskflow.ts",
+  "test/helpers/plugins/temp-dir.ts",
+  "test/helpers/plugins/temp-home.ts",
+  "test/helpers/plugins/typed-cases.ts",
+];
+
 function isExtensionTestFile(filePath: string): boolean {
   return /\.test\.[cm]?[jt]sx?$/u.test(filePath) || /\.e2e\.test\.[cm]?[jt]sx?$/u.test(filePath);
 }
@@ -109,7 +122,12 @@ function collectRelativeCoreImportOffenders(
 
 function main() {
   const extensionsDir = path.join(process.cwd(), "extensions");
-  const files = collectExtensionTestFiles(extensionsDir);
+  const files = [
+    ...collectExtensionTestFiles(extensionsDir),
+    ...EXTENSION_TEST_HELPER_BRIDGE_FILES.map((file) => path.join(process.cwd(), file)).filter(
+      (file) => fs.existsSync(file),
+    ),
+  ];
   const offenders: Offender[] = [];
 
   for (const file of files) {
@@ -130,7 +148,7 @@ function main() {
 
   if (offenders.length > 0) {
     console.error(
-      "Extension test files must stay on extension test bridges or public plugin-sdk surfaces.",
+      "Extension test files and helper bridges must stay on public plugin-sdk surfaces.",
     );
     for (const offender of offenders.toSorted((a, b) => a.file.localeCompare(b.file))) {
       const location = offender.line
@@ -143,7 +161,7 @@ function main() {
   }
 
   console.log(
-    `OK: extension test files and support helpers avoid direct core test/internal imports (${files.length} checked).`,
+    `OK: extension test files, support helpers, and helper bridges avoid direct core test/internal imports (${files.length} checked).`,
   );
 }
 
diff --git a/src/plugin-sdk/testing.ts b/src/plugin-sdk/testing.ts
index cfc85fcbc6d..8cfbde3ab7e 100644
--- a/src/plugin-sdk/testing.ts
+++ b/src/plugin-sdk/testing.ts
@@ -114,10 +114,15 @@ export { countLines, hasBalancedFences } from "../test-utils/chunk-test-helpers.
 export { expectGeneratedTokenPersistedToGatewayAuth } from "../test-utils/auth-token-assertions.js";
 export { captureEnv, withEnv, withEnvAsync } from "../test-utils/env.js";
 export { withFetchPreconnect, type FetchMock } from "../test-utils/fetch-mock.js";
+export { createMockServerResponse } from "../test-utils/mock-http-response.js";
+export { registerSingleProviderPlugin } from "../test-utils/plugin-registration.js";
 export { createTempHomeEnv, type TempHomeEnv } from "../test-utils/temp-home.js";
+export { withTempDir } from "../test-utils/temp-dir.js";
+export { typedCases } from "../test-utils/typed-cases.js";
 export { createMockPluginRegistry } from "../plugins/hooks.test-helpers.js";
 export { buildPluginApi } from "../plugins/api-builder.js";
 export {
   createCapturedPluginRegistration,
   type CapturedPluginRegistration,
 } from "../plugins/captured-registration.js";
+export { createRuntimeTaskFlow } from "../plugins/runtime/runtime-taskflow.js";
diff --git a/test/helpers/plugins/env.ts b/test/helpers/plugins/env.ts
index fc63cd27c4a..8292d8f7418 100644
--- a/test/helpers/plugins/env.ts
+++ b/test/helpers/plugins/env.ts
@@ -1 +1 @@
-export { withEnv, withEnvAsync } from "../../../src/test-utils/env.js";
+export { withEnv, withEnvAsync } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/fetch-mock.ts b/test/helpers/plugins/fetch-mock.ts
index e1774b46463..e7b86b14350 100644
--- a/test/helpers/plugins/fetch-mock.ts
+++ b/test/helpers/plugins/fetch-mock.ts
@@ -1 +1 @@
-export { withFetchPreconnect, type FetchMock } from "../../../src/test-utils/fetch-mock.js";
+export { withFetchPreconnect, type FetchMock } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/media-understanding.ts b/test/helpers/plugins/media-understanding.ts
index e524e9f3199..c902d959443 100644
--- a/test/helpers/plugins/media-understanding.ts
+++ b/test/helpers/plugins/media-understanding.ts
@@ -1 +1 @@
-export { createRequestCaptureJsonFetch } from "../../../src/media-understanding/audio.test-helpers.js";
+export { createRequestCaptureJsonFetch } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/mock-http-response.ts b/test/helpers/plugins/mock-http-response.ts
index 3bbed0372a8..5579344ff0d 100644
--- a/test/helpers/plugins/mock-http-response.ts
+++ b/test/helpers/plugins/mock-http-response.ts
@@ -1 +1 @@
-export { createMockServerResponse } from "../../../src/test-utils/mock-http-response.js";
+export { createMockServerResponse } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/plugin-registration.ts b/test/helpers/plugins/plugin-registration.ts
index bd20510800e..9c9f806e8fc 100644
--- a/test/helpers/plugins/plugin-registration.ts
+++ b/test/helpers/plugins/plugin-registration.ts
@@ -1 +1 @@
-export { registerSingleProviderPlugin } from "../../../src/test-utils/plugin-registration.js";
+export { registerSingleProviderPlugin } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/plugin-registry.ts b/test/helpers/plugins/plugin-registry.ts
index c75fe4838bc..c0f1f84db9b 100644
--- a/test/helpers/plugins/plugin-registry.ts
+++ b/test/helpers/plugins/plugin-registry.ts
@@ -1,3 +1,5 @@
-export { createEmptyPluginRegistry } from "../../../src/plugins/registry.js";
-export { setActivePluginRegistry } from "../../../src/plugins/runtime.js";
-export { createTestRegistry } from "../../../src/test-utils/channel-plugins.js";
+export {
+  createEmptyPluginRegistry,
+  createTestRegistry,
+  setActivePluginRegistry,
+} from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/runtime-taskflow.ts b/test/helpers/plugins/runtime-taskflow.ts
index a1293bfa651..8a1e00fdf72 100644
--- a/test/helpers/plugins/runtime-taskflow.ts
+++ b/test/helpers/plugins/runtime-taskflow.ts
@@ -1 +1 @@
-export { createRuntimeTaskFlow } from "../../../src/plugins/runtime/runtime-taskflow.js";
+export { createRuntimeTaskFlow } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/temp-dir.ts b/test/helpers/plugins/temp-dir.ts
index 08ec26218ec..f5ad08cd585 100644
--- a/test/helpers/plugins/temp-dir.ts
+++ b/test/helpers/plugins/temp-dir.ts
@@ -1 +1 @@
-export { withTempDir } from "../../../src/test-utils/temp-dir.js";
+export { withTempDir } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/temp-home.ts b/test/helpers/plugins/temp-home.ts
index 11db678ef77..cf200c4f7fe 100644
--- a/test/helpers/plugins/temp-home.ts
+++ b/test/helpers/plugins/temp-home.ts
@@ -1 +1 @@
-export { createTempHomeEnv, type TempHomeEnv } from "../../../src/test-utils/temp-home.js";
+export { createTempHomeEnv, type TempHomeEnv } from "openclaw/plugin-sdk/testing";
diff --git a/test/helpers/plugins/typed-cases.ts b/test/helpers/plugins/typed-cases.ts
index 45be30b08c3..cabfb116195 100644
--- a/test/helpers/plugins/typed-cases.ts
+++ b/test/helpers/plugins/typed-cases.ts
@@ -1 +1 @@
-export { typedCases } from "../../../src/test-utils/typed-cases.js";
+export { typedCases } from "openclaw/plugin-sdk/testing";