diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 57efb821..fd0c5cf6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -86,6 +86,22 @@ jobs:
       - name: build
         run: docker build -t ember:ci .
 
+  go-client:
+    name: go client
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.22'
+          cache-dependency-path: clients/ember-go/go.sum
+      - name: build
+        working-directory: clients/ember-go
+        run: go build ./...
+      - name: test
+        working-directory: clients/ember-go
+        run: go test ./...
+
   security:
     name: security
     runs-on: ubuntu-latest
diff --git a/clients/ember-py/ember/client.py b/clients/ember-py/ember/client.py
index 0a4c601c..1643fd88 100644
--- a/clients/ember-py/ember/client.py
+++ b/clients/ember-py/ember/client.py
@@ -289,12 +289,14 @@ def vadd(
             "euclidean": ember_pb2.VECTOR_METRIC_EUCLIDEAN,
             "ip": ember_pb2.VECTOR_METRIC_INNER_PRODUCT,
         }
+        if metric not in metric_map:
+            raise ValueError(f"unknown metric {metric!r}; expected one of: cosine, euclidean, ip")
         resp = self._stub.VAdd(
             ember_pb2.VAddRequest(
                 key=key,
                 element=element,
                 vector=vector,
-                metric=metric_map.get(metric, ember_pb2.VECTOR_METRIC_COSINE),
+                metric=metric_map[metric],
                 connectivity=m,
                 ef_construction=ef,
             ),
@@ -320,6 +322,8 @@ def vadd_batch(
             "euclidean": ember_pb2.VECTOR_METRIC_EUCLIDEAN,
             "ip": ember_pb2.VECTOR_METRIC_INNER_PRODUCT,
         }
+        if metric not in metric_map:
+            raise ValueError(f"unknown metric {metric!r}; expected one of: cosine, euclidean, ip")
         batch_entries = [
             ember_pb2.VAddBatchEntry(element=elem, vector=vec)
             for elem, vec in entries
@@ -328,7 +332,7 @@ def vadd_batch(
             ember_pb2.VAddBatchRequest(
                 key=key,
                 entries=batch_entries,
-                metric=metric_map.get(metric, ember_pb2.VECTOR_METRIC_COSINE),
+                metric=metric_map[metric],
                 connectivity=m,
                 ef_construction=ef,
             ),