Checks

A check is a named validation step that a participant must pass to unlock the next chapter.

Check struct

type Check struct {
    Description string
    Run         func(context.Context) error
    Timeout     time.Duration // 0 = no limit per attempt
    Retries     int           // additional attempts after first failure (0 = run once)
    RetryDelay  time.Duration // pause between retries (0 = no delay)
}

• Description is shown in CLI output next to the pass/fail icon.
• Run is any func(context.Context) error. Return nil to pass; return a non-nil error to fail with that message. When Timeout is set, the context passed to Run carries the per-attempt deadline — pass it to any blocking calls so they can be cancelled.
• Timeout, Retries, RetryDelay are optional — useful for checks that need to wait for services to start.