Implement defensive checks and error handling in CI/CD workflows to prevent failures and ensure robust operations. This includes validating preconditions, checking for edge cases, and using appropriate tools that preserve important information. Key practices: - Add validation checks before critical operations to prevent duplicate or conflicting actions - Use proper tools that preserve metadata (e.g., `git am` instead of `patch` to maintain author information) - Verify platform compatibility when adding new dependencies - Implement comprehensive testing that covers all supported environments Example from sync workflow: ```bash # Check if commit already synced to prevent duplicates if git show --stat HEAD | grep -q "synced from"; then echo "error: HEAD commit already comes from Pro and cannot be synced" exit 1 fi # Use git am to preserve author info instead of patch sed -E 's:( a| b)/:\1OSS/:g' 0001-*.patch >pro.patch git am pro.patch ``` This approach prevents common CI failures, reduces debugging time, and ensures workflows handle edge cases gracefully while maintaining data integrity.