SMS Step

SMS step for urgent alerts, verification codes, time-sensitive messages.

Guidelines

body must be under 160 characters to avoid message splitting.
Direct and actionable — essential info only.
Avoid special characters and unnecessary URLs.

Variables

Use Liquid syntax in body:

{{ subscriber.firstName }}
{{ payload.* }}
{{ steps.<http-step-id>.<property> }} — only when the upstream HTTP step declares the property in its responseBodySchema

See Also

step-conditions.md — common pattern: SMS only when critical: true or other channels failed
design-workflow/references/channel-selection.md — SMS is a last resort: OTP, regulatory, true emergencies

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