diff --git a/.github/workflows/ci_cd.yml b/.github/workflows/ci_cd.yml
index 56c31d19..75c64236 100644
--- a/.github/workflows/ci_cd.yml
+++ b/.github/workflows/ci_cd.yml
@@ -12,6 +12,8 @@ jobs:
         python-version: [3.9, 3.11]
         os: [ ubuntu-22.04, windows-2022, macos-12 ]
     runs-on: ${{ matrix.os }}
+    env:
+      RUNTIME_TAG: ci_job
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
diff --git a/vision_agent/tools/tool_utils.py b/vision_agent/tools/tool_utils.py
index f0304653..b87689c4 100644
--- a/vision_agent/tools/tool_utils.py
+++ b/vision_agent/tools/tool_utils.py
@@ -14,14 +14,13 @@
 def _send_inference_request(
     payload: Dict[str, Any], endpoint_name: str
 ) -> Dict[str, Any]:
-    # runtime_tag is used to differentiate different internal callers
-    runtime_tag = os.environ.get("RUNTIME_TAG", "")
+    if runtime_tag := os.environ.get("RUNTIME_TAG", ""):
+        payload["runtime_tag"] = runtime_tag
     res = requests.post(
         f"{_LND_API_URL}/model/{endpoint_name}",
         headers={
             "Content-Type": "application/json",
             "apikey": _LND_API_KEY,
-            "runtime-tag": runtime_tag,
         },
         json=payload,
     )