diff --git a/scripts/ci-local.sh b/scripts/ci-local.sh
index 63ecd0c..f5f1eb4 100755
--- a/scripts/ci-local.sh
+++ b/scripts/ci-local.sh
@@ -9,6 +9,14 @@
 set -euo pipefail
 cd "$(dirname "$0")/.."
 
+# Steps chain with `;`, NOT `&&`. Under `set -e`, bash exempts every command of an
+# AND-OR list except the last, so in `gen && git diff --exit-code` a CRASH in `gen`
+# is silently swallowed — the diff never runs and the script sails on. That is not
+# hypothetical: it hid a real `gen:api` crash (RB-09), which .github/workflows/ci.yml
+# would have caught because it runs each step as its own `- run:`. With `;` errexit
+# fires on the first failure. The one `( cd backend && ... )` below is safe as-is:
+# a subshell propagates its own non-zero status, so errexit sees it.
+
 step() { printf '\n\033[1;36m▶ %s\033[0m\n' "$1"; }
 
 step "lint";                      npm run lint
@@ -18,16 +26,16 @@ step "format:check (prettier)";   npm run format:check
 step "check:tokens";              npm run check:tokens
 step "check:seam";                npm run check:seam
 step "test (vitest + coverage)";  npm run test:coverage
-step "build --localize (nl+en)";  npx ng build ssp --localize && npx ng build behandelportal --localize
+step "build --localize (nl+en)";  npx ng build ssp --localize; npx ng build behandelportal --localize
 step "npm audit (shipped deps)";  npm audit --omit=dev
 step "backend format + tests";    ( cd backend && dotnet format BigRegister.slnx --verify-no-changes && dotnet test BigRegister.slnx --filter "Category!=Integration" )
-step "showcase snippets drift";   npm run gen:snippets && git diff --exit-code apps/ssp/src/app/showcase/snippets.generated.ts
-step "behaviour spec drift";      npm run gen:behaviour-spec && git diff --exit-code libs/shared/docs/behaviour-spec.mdx
-step "api-client drift";          npm run gen:api && git diff --exit-code libs/shared/src/infrastructure/api-client.ts backend/swagger.json
+step "showcase snippets drift";   npm run gen:snippets; git diff --exit-code apps/ssp/src/app/showcase/snippets.generated.ts
+step "behaviour spec drift";      npm run gen:behaviour-spec; git diff --exit-code libs/shared/docs/behaviour-spec.mdx
+step "api-client drift";          npm run gen:api; git diff --exit-code libs/shared/src/infrastructure/api-client.ts backend/swagger.json
 
 if [[ "${1:-}" == "--full" ]]; then
-  step "storybook build + axe (ssp)";              npm run build-storybook && npm run test-storybook:ci
-  step "storybook build + axe (behandelportal)";   npm run build-storybook:behandelportal && npm run test-storybook:ci:behandelportal
+  step "storybook build + axe (ssp)";              npm run build-storybook; npm run test-storybook:ci
+  step "storybook build + axe (behandelportal)";   npm run build-storybook:behandelportal; npm run test-storybook:ci:behandelportal
 fi
 
 printf '\n\033[1;32m✔ local CI passed\033[0m\n'