diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..ba21a9f
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,30 @@
+# CI for the action itself: unit tests for the components, and a check that the
+# committed bundle (dist/index.js, which action.yml runs verbatim) is fresh and
+# loads under Node.
+name: ci
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
+        with:
+          node-version: 24
+      - name: Install bit
+        run: |
+          npx --yes @teambit/bvm install 2.2.115
+          echo "$HOME/bin" >> "$GITHUB_PATH"
+      - name: Install dependencies
+        run: bit install
+      - name: Test
+        run: bit test
+      - name: Verify the committed bundle
+        run: node scripts/verify-bundle.mjs
diff --git a/action.yml b/action.yml
index 90775a0..958be29 100644
--- a/action.yml
+++ b/action.yml
@@ -19,7 +19,7 @@ inputs:
     required: false
     default: bit-sync/main
 runs:
-  using: node20
+  using: node24
   # Committed esbuild bundle -- see scripts/bundle-action.mjs. Must be ESM
   # (the root package.json is `"type": "module"`); `npm run verify-bundle`
   # asserts it is both fresh and loadable.
diff --git a/dist/index.js b/dist/index.js
index 37d7b39..976150c 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -45,7 +45,7 @@ function scopesInComponentIds(componentIds) {
 function isLaneRelevantToScope(componentIds, repoScope) {
   if (!componentIds || !repoScope)
     return true;
-  const scopes = scopesInComponentIds(componentIds);
+  const scopes = scopesInComponentIds(Array.isArray(componentIds) ? componentIds.join(",") : String(componentIds));
   if (scopes.length === 0)
     return true;
   return scopes.includes(repoScope);
diff --git a/git-sync/git-sync/event-router/event-router.spec.ts b/git-sync/git-sync/event-router/event-router.spec.ts
index 7313215..7b0d699 100644
--- a/git-sync/git-sync/event-router/event-router.spec.ts
+++ b/git-sync/git-sync/event-router/event-router.spec.ts
@@ -72,6 +72,33 @@ describe('routeEvent', () => {
       });
     });
 
+    it('accepts componentIds as an array (API-created webhooks, hand-rolled dispatches)', () => {
+      expect(
+        routeEvent({
+          ...base,
+          eventName: 'repository_dispatch',
+          dispatchType: 'bit-export',
+          repoScope: 'acme.cards',
+          clientPayload: {
+            laneId: 'acme.cards/cross-scope',
+            componentIds: ['acme.shop/bar@2.0.0', 'acme.cards/foo@1.0.0'],
+          },
+        })
+      ).toEqual({ kind: 'run', args: ['sync', 'acme.cards/cross-scope'] });
+    });
+
+    it('treats an empty componentIds array as absent (fails open)', () => {
+      expect(
+        routeEvent({
+          ...base,
+          eventName: 'repository_dispatch',
+          dispatchType: 'bit-export',
+          repoScope: 'acme.cards',
+          clientPayload: { laneId: '', componentIds: [] },
+        })
+      ).toEqual({ kind: 'run', args: ['sync', '--main'] });
+    });
+
     it('fails open (routes) when componentIds is absent, even with repoScope set', () => {
       expect(
         routeEvent({
diff --git a/git-sync/git-sync/event-router/event-router.ts b/git-sync/git-sync/event-router/event-router.ts
index 1a3b3ac..04949ac 100644
--- a/git-sync/git-sync/event-router/event-router.ts
+++ b/git-sync/git-sync/event-router/event-router.ts
@@ -28,9 +28,10 @@ export type RouterInput = {
      * cross-scope-lane relevance filter (see `repoScope` below) to decide
      * whether this repo has any stake in a lane export before routing it.
      * Absent/empty is NOT a signal of anything — it just means the filter
-     * can't run, so it fails open (see `isLaneRelevantToScope`).
+     * can't run, so it fails open (see `isLaneRelevantToScope`). A webhook
+     * created through the API, or a hand-rolled dispatch, may send an array.
      */
-    componentIds?: string;
+    componentIds?: string | string[];
   };
   /** push: refs/heads/<branch>. */
   ref?: string;
@@ -179,9 +180,9 @@ function scopesInComponentIds(componentIds: string): string[] {
  * whose content isn't entirely inside `defaultScope`, so failing open here
  * only means the halt happens in `bit ci` instead of being pre-empted here.
  */
-function isLaneRelevantToScope(componentIds: string | undefined, repoScope: string | undefined): boolean {
+function isLaneRelevantToScope(componentIds: string | string[] | undefined, repoScope: string | undefined): boolean {
   if (!componentIds || !repoScope) return true;
-  const scopes = scopesInComponentIds(componentIds);
+  const scopes = scopesInComponentIds(Array.isArray(componentIds) ? componentIds.join(',') : String(componentIds));
   if (scopes.length === 0) return true;
   return scopes.includes(repoScope);
 }
diff --git a/scripts/bundle-action.mjs b/scripts/bundle-action.mjs
index 12a312e..74f85a7 100644
--- a/scripts/bundle-action.mjs
+++ b/scripts/bundle-action.mjs
@@ -27,7 +27,7 @@ export const bundleOptions = {
   entryPoints: [join(repoRoot, 'git-sync/git-sync/action/run.ts')],
   bundle: true,
   platform: 'node',
-  target: 'node20',
+  target: 'node24',
   format: 'esm',
   absWorkingDir: repoRoot,
 };