Fortify

Production workflows fail. APIs time out, rate limits hit, networks drop. This skill adds the five resilience layers you should have built in from the start: input validation, exponential backoff retries, fallback strategies, circuit breakers, and proper timeouts. It's opinionated about what's retryable (500s, timeouts) versus what's not (auth failures, bad requests). The audit checklist is genuinely useful for code review. Run this when you're tired of getting paged at 3am because your workflow has no error handling, or when you need to harden something before it goes to production. Pairs well with the evaluate skill to actually test your failure scenarios.