diff --git a/infra/k8s/argo/argo-workflow-netpol.yaml b/infra/k8s/argo/argo-workflow-netpol.yaml
index 80c7caf01..0ff7c3336 100644
--- a/infra/k8s/argo/argo-workflow-netpol.yaml
+++ b/infra/k8s/argo/argo-workflow-netpol.yaml
@@ -159,6 +159,78 @@ spec:
             matchLabels:
               app.kubernetes.io/name: minio
 ---
+# Compile-and-train workflow pods: compile step needs GitLab SSH + external HTTPS + DNS,
+# training steps need GitLab HTTP (package fetch/upload), MinIO, Tempo, k8s API.
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: argo-compile-and-train-workflow
+  namespace: foxhunt
+  labels:
+    app.kubernetes.io/part-of: foxhunt
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/component: compile-and-train
+  policyTypes:
+    - Egress
+  egress:
+    # DNS
+    - ports:
+        - port: 53
+          protocol: UDP
+        - port: 53
+          protocol: TCP
+    # Kubernetes API — Argo executor
+    - ports:
+        - port: 443
+          protocol: TCP
+        - port: 6443
+          protocol: TCP
+      to:
+        - ipBlock:
+            cidr: 10.32.0.0/16
+        - ipBlock:
+            cidr: 172.16.0.4/32
+    # External HTTPS — cargo fetches crates.io, github.com (candle git dep)
+    - ports:
+        - port: 443
+          protocol: TCP
+    # GitLab SSH — git clone
+    - ports:
+        - port: 2222
+          protocol: TCP
+      to:
+        - ipBlock:
+            cidr: 100.90.76.85/32
+        - podSelector:
+            matchLabels:
+              app: gitlab-shell
+    # GitLab webservice — package upload/download
+    - ports:
+        - port: 8181
+          protocol: TCP
+      to:
+        - podSelector:
+            matchLabels:
+              app: webservice
+    # MinIO — binary upload
+    - ports:
+        - port: 9000
+          protocol: TCP
+      to:
+        - podSelector:
+            matchLabels:
+              app.kubernetes.io/name: minio
+    # Tempo — OTLP traces
+    - ports:
+        - port: 4317
+          protocol: TCP
+      to:
+        - podSelector:
+            matchLabels:
+              app.kubernetes.io/name: tempo
+---
 # CI pipeline pods (detect-changes + compile-service inline templates)
 apiVersion: networking.k8s.io/v1
 kind: NetworkPolicy