diff --git a/codex-rs/.config/nextest.toml b/codex-rs/.config/nextest.toml
index 3f68bbbe9..86d00e463 100644
--- a/codex-rs/.config/nextest.toml
+++ b/codex-rs/.config/nextest.toml
@@ -8,6 +8,11 @@ max-threads = 1
 [test-groups.app_server_integration]
 max-threads = 1
 
+[test-groups.core_apply_patch_cli_integration]
+max-threads = 1
+
+[test-groups.windows_sandbox_legacy_sessions]
+max-threads = 1
 
 [[profile.default.overrides]]
 # Do not add new tests here
@@ -27,3 +32,15 @@ test-group = 'app_server_protocol_codegen'
 # Keep the library unit tests parallel.
 filter = 'package(codex-app-server) & kind(test)'
 test-group = 'app_server_integration'
+
+[[profile.default.overrides]]
+# These tests exercise full Codex turns and apply_patch execution, and they are
+# sensitive to Windows runner process-startup stalls when many cases launch at once.
+filter = 'package(codex-core) & kind(test) & test(apply_patch_cli)'
+test-group = 'core_apply_patch_cli_integration'
+
+[[profile.default.overrides]]
+# These tests create restricted-token Windows child processes and private desktops.
+# Serialize them to avoid exhausting Windows session/global desktop resources in CI.
+filter = 'package(codex-windows-sandbox) & test(legacy_)'
+test-group = 'windows_sandbox_legacy_sessions'