diff --git a/.github/workflows/drift-check.yml b/.github/workflows/drift-check.yml
index 88b2962..2018bf1 100644
--- a/.github/workflows/drift-check.yml
+++ b/.github/workflows/drift-check.yml
@@ -6,6 +6,12 @@ on:
   schedule:
     - cron: "0 6 * * *"
   workflow_dispatch:
+    inputs:
+      preflight_only:
+        description: "Build and upload the trusted preflight artifact without running drift review"
+        required: false
+        type: boolean
+        default: false
 
 permissions:
   contents: read
@@ -193,7 +199,9 @@ jobs:
           if-no-files-found: error
 
   drift:
-    if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+    if: >-
+      github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+      && (github.event_name != 'workflow_dispatch' || inputs.preflight_only != true)
     needs: preflight_backtests
     permissions:
       contents: read
diff --git a/tests/test_drift_workflow_config.py b/tests/test_drift_workflow_config.py
index 90984bb..31ccad7 100644
--- a/tests/test_drift_workflow_config.py
+++ b/tests/test_drift_workflow_config.py
@@ -4,6 +4,10 @@
 def test_drift_workflow_wires_real_pipeline_inputs_and_preflight_bundle() -> None:
     workflow = (Path(__file__).resolve().parents[1] / ".github" / "workflows" / "drift-check.yml").read_text(encoding="utf-8")
 
+    assert "preflight_only:" in workflow
+    assert "type: boolean" in workflow
+    assert "default: false" in workflow
+    assert "inputs.preflight_only != true" in workflow
     assert "preflight_backtests:" in workflow
     assert "needs: preflight_backtests" in workflow
     assert "snapshot_repository_ref: ${{ steps.snapshot-input.outputs.snapshot_repository_ref }}" in workflow