diff --git a/.github/workflows/test-functional.yml b/.github/workflows/test-functional.yml
index ef3de5a2444d..5fbd2f5e653f 100644
--- a/.github/workflows/test-functional.yml
+++ b/.github/workflows/test-functional.yml
@@ -1,17 +1,52 @@
 name: "test / functional"
 
 on:
- pull_request
+  workflow_run:
+    workflows: ["trigger"]
+    types:
+      - requested
 
 permissions:
   statuses: write
 
+concurrency:
+  group: "${{ github.event.workflow_run.head_repository.full_name }}-${{ github.event.workflow_run.head_branch }}-${{ github.workflow_ref }}"
+  cancel-in-progress: true
+
 jobs:
+  changes:
+    name: "changes"
+    runs-on: ubuntu-latest
+    outputs:
+      should_run: ${{ steps.changes.outputs.should_run }}
+      sha: ${{ steps.changes.outputs.sha }}
+      merge_sha: ${{ steps.changes.outputs.merge_sha }}
+      pr_number: ${{ steps.changes.outputs.pr_number }}
+      source_branch: ${{ steps.changes.outputs.source_branch }}
+      source_repo: ${{ steps.changes.outputs.source_repo }}
+      mergeable: ${{ steps.changes.outputs.mergeable }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: "gradio-app/gradio/.github/actions/changes@main"
+        id: changes
+        with:
+          type: "functional"
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: echo github context
+        if: always()
+        run: echo "${{ github.event.workflow_run.head_repository.full_name }}-${{ github.event.workflow_run.head_branch }}-${{ github.workflow_ref }}"
+
   test-functional:
     name: "test-functional"
+    needs: changes
+    if: needs.changes.outputs.should_run == 'true'
     runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ needs.changes.outputs.merge_sha }}
+          repository: ${{ needs.changes.outputs.mergeable == 'true' &&  github.repository || needs.changes.outputs.source_repo }}
       - name: install dependencies
         id: install_deps
         uses: "gradio-app/gradio/.github/actions/install-all-deps@main"