diff --git a/packages/webhook/package.json b/packages/webhook/package.json
index b9f8f6fb8..6ccc68eda 100644
--- a/packages/webhook/package.json
+++ b/packages/webhook/package.json
@@ -37,8 +37,8 @@
     "build:clean": "shx rm -rf ./dist",
     "docs": "npx typedoc --plugin typedoc-plugin-markdown",
     "prepack": "npm run build",
-    "test": "npm run build && node --test-reporter=spec --test-reporter-destination=stdout --test-reporter=junit --test-reporter-destination=test-results.xml --import tsx --test src/IncomingWebhook.test.ts",
-    "test:coverage": "npm run build && node --experimental-test-coverage --test-reporter=spec --test-reporter-destination=stdout --test-reporter=lcov --test-reporter-destination=lcov.info --test-reporter=junit --test-reporter-destination=test-results.xml --import tsx --test src/IncomingWebhook.test.ts"
+    "test": "npm run build && node --test-reporter=spec --test-reporter-destination=stdout --test-reporter=junit --test-reporter-destination=test-results.xml --import tsx --test src/*.test.ts",
+    "test:coverage": "npm run build && node --experimental-test-coverage --test-reporter=spec --test-reporter-destination=stdout --test-reporter=lcov --test-reporter-destination=lcov.info --test-reporter=junit --test-reporter-destination=test-results.xml --import tsx --test src/*.test.ts"
   },
   "dependencies": {
     "@slack/types": "^2.20.1",
diff --git a/packages/webhook/src/index.ts b/packages/webhook/src/index.ts
index 74420ffba..8c3183fed 100644
--- a/packages/webhook/src/index.ts
+++ b/packages/webhook/src/index.ts
@@ -14,3 +14,5 @@ export {
   IncomingWebhookResult,
   IncomingWebhookSendArguments,
 } from './IncomingWebhook';
+
+export {addAppMetadata} from './instrument';
\ No newline at end of file
diff --git a/packages/webhook/src/instrument.test.ts b/packages/webhook/src/instrument.test.ts
new file mode 100644
index 000000000..0b2e8380c
--- /dev/null
+++ b/packages/webhook/src/instrument.test.ts
@@ -0,0 +1,16 @@
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+
+import { addAppMetadata } from './index';
+import { getUserAgent } from './instrument';
+
+describe('@slack/webhook public exports', () => {
+  it('exposes a working addAppMetadata from the package entry point', () => {
+    // addAppMetadata must be reachable from the package's public API (./index) and the instrument function.
+    addAppMetadata({ name: '@slack/slack-github-action', version: '3.0.3' });
+    assert.ok(
+      getUserAgent().includes('@slack:slack-github-action/3.0.3'),
+      'addAppMetadata re-exported from ./index should affect the User-Agent',
+    );
+  });
+});
\ No newline at end of file