diff --git a/nix/templates/harness-base.nix b/nix/templates/harness-base.nix
index e157d2c5..6175d22f 100644
--- a/nix/templates/harness-base.nix
+++ b/nix/templates/harness-base.nix
@@ -740,6 +740,10 @@ in
         [ -d "$stateDir" ] || continue
         chown -hR "$userName:$userName" "$stateDir" 2>/dev/null || true
       done
+      for harnessDir in /agents/*/harness; do
+        [ -d "$harnessDir" ] || continue
+        chown -hR "$userName:$userName" "$harnessDir" 2>/dev/null || true
+      done
       if [ -d "$homeDir/.claude" ]; then
         chown -hR "$userName:$userName" "$homeDir/.claude" 2>/dev/null || true
       fi