Santiago Valdarrama

Deterministic tests > Written instructions Anything that should be checked automatically should have a test case: • Checking behavior → Unit and integration tests • Checking formatting → Formatters and linters • Checking types → Static type checkers • Checking API contracts → Schema validation • Checking edge cases → Targeted tests • Checking regressions → Regression tests • Checking security → Static analysis and security scans Don't waste tokens telling an agent to follow rules you could enforce with deterministic tests.