diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 83cf8f78f..49acfaf42 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -293,6 +293,7 @@ jobs:
         uses: codecov/codecov-action@v5
         with:
           files: coverage-${{ matrix.shard }}.xml
+          disable_search: true
           flags: python
           name: python-shard-${{ matrix.shard }}
           # Token is sent so uploads authenticate once the repo is activated on
diff --git a/scripts/tests/test_ci_workflow.py b/scripts/tests/test_ci_workflow.py
index 20c873d46..c38c399b9 100644
--- a/scripts/tests/test_ci_workflow.py
+++ b/scripts/tests/test_ci_workflow.py
@@ -7,10 +7,17 @@ from pathlib import Path
 
 def test_sharded_ci_verifies_offline_huggingface_cache_before_pytest() -> None:
     workflow = Path(".github/workflows/ci.yml").read_text(encoding="utf-8")
-
     verify_step = "Verify offline HuggingFace model cache"
     pytest_step = "Run test shard ${{ matrix.shard }}/4"
 
     assert verify_step in workflow
     assert "python scripts/ci/verify_hf_model_cache.py" in workflow
     assert workflow.index(verify_step) < workflow.index(pytest_step)
+
+
+def test_sharded_ci_uploads_only_explicit_coverage_reports() -> None:
+    workflow = Path(".github/workflows/ci.yml").read_text(encoding="utf-8")
+    upload_step = workflow[workflow.index("Upload coverage shard") :]
+
+    assert "files: coverage-${{ matrix.shard }}.xml" in upload_step
+    assert "disable_search: true" in upload_step