diff --git a/decnet/web/router/swarm_mgmt/api_enroll_bundle.py b/decnet/web/router/swarm_mgmt/api_enroll_bundle.py
index c099515..15c3f34 100644
--- a/decnet/web/router/swarm_mgmt/api_enroll_bundle.py
+++ b/decnet/web/router/swarm_mgmt/api_enroll_bundle.py
@@ -61,8 +61,12 @@ _EXCLUDES: tuple[str, ...] = (
     "tests", "tests/*",
     "development", "development/*",
     "wiki-checkout", "wiki-checkout/*",
-    "decnet_web/node_modules", "decnet_web/node_modules/*",
-    "decnet_web/src", "decnet_web/src/*",
+    # Frontend is master-only; agents never serve UI.
+    "decnet_web", "decnet_web/*", "decnet_web/**",
+    # Master FastAPI app (API, routers, master-side DB) is not run on agents.
+    # The `agent` / `updater` / `forwarder` commands have their own apps under
+    # decnet/agent, decnet/updater — they don't import decnet.web.
+    "decnet/web", "decnet/web/*", "decnet/web/**",
     "decnet-state.json",
     "master.log", "master.json",
     "decnet.tar",
diff --git a/tests/api/swarm_mgmt/test_enroll_bundle.py b/tests/api/swarm_mgmt/test_enroll_bundle.py
index ee5b10d..d3a085f 100644
--- a/tests/api/swarm_mgmt/test_enroll_bundle.py
+++ b/tests/api/swarm_mgmt/test_enroll_bundle.py
@@ -297,6 +297,11 @@ async def test_get_tgz_contents(client, auth_token, tmp_path):
         assert not bad.endswith(".env"), f"leaked env file: {bad}"
         assert ".env.local" not in bad, f"leaked env file: {bad}"
         assert ".env.example" not in bad, f"leaked env file: {bad}"
+        # Master-only trees: agents don't run the FastAPI master app or the
+        # React frontend, so shipping them bloats the tarball and widens the
+        # worker's attack surface for no benefit.
+        assert not bad.startswith("decnet_web/"), f"leaked frontend: {bad}"
+        assert not bad.startswith("decnet/web/"), f"leaked master-api: {bad}"
 
     # INI content is correct
     ini = tf.extractfile("etc/decnet/decnet.ini").read().decode()