diff --git a/backend/apps/outputs/workspace_io.py b/backend/apps/outputs/workspace_io.py
index 3cb7bcec..de3e0a08 100644
--- a/backend/apps/outputs/workspace_io.py
+++ b/backend/apps/outputs/workspace_io.py
@@ -75,6 +75,12 @@ WALK_SKIP_DIRS = frozenset({
     ".ruff_cache",
 })
 
+# OS/editor junk files that ride along in a workspace but are noise in an export.
+WALK_SKIP_FILES = frozenset({
+    ".DS_Store",
+    "Thumbs.db",
+})
+
 # Cap per-file response size at 256 KB. Hand-written source rarely exceeds this; auto-generated bundles routinely run into the MBs and they're not what the user/agent is editing. Anything over the cap returns a truncated stub the frontend treats as "open the file directly to see full contents."
 P_WALK_MAX_FILE_BYTES = 256 * 1024
 
diff --git a/backend/apps/swarm/entities/apps.py b/backend/apps/swarm/entities/apps.py
index 37cbb0ad..024c37ad 100644
--- a/backend/apps/swarm/entities/apps.py
+++ b/backend/apps/swarm/entities/apps.py
@@ -12,7 +12,7 @@ import socket
 from uuid import uuid4
 
 from backend.apps.outputs.models import Output
-from backend.apps.outputs.workspace_io import WALK_SKIP_DIRS, save, load_output
+from backend.apps.outputs.workspace_io import WALK_SKIP_DIRS, WALK_SKIP_FILES, save, load_output
 from backend.config.paths import OUTPUTS_DIR, OUTPUTS_WORKSPACE_DIR
 
 from backend.apps.swarm.exportable import DepRef, ExportContext, RemapTable
@@ -57,6 +57,8 @@ class AppExportable:
                 # .env is install-specific (absolute paths + port); .env.example travels instead.
                 if fn == ".env":
                     continue
+                if fn in WALK_SKIP_FILES:
+                    continue
                 full = os.path.join(root, fn)
                 if os.path.islink(full):
                     continue