Reach everyone who is due, not just the ones who reply.

interface Due { memberId: string; phone: string; reason: string }

export class HealthLoop extends Workflow {
  async run(event: HealthEvent<Due>, step: HealthStep) {
    const { memberId, phone, reason } = event.body;

    // The trigger response carries the scan link for your message.
    await step.do("Open scan", async ({ ctx }) => {
      const member = await ctx.USER.getUser({ id: memberId });
      await ctx.FACIAL_SCAN.create({ user: member, metadata: { reason } });
    });

    try {
      const scan = await step.waitForScan({ timeout: "2 days" });
      const report = await step.do("Report link", () => scan.pdfUrl());
      return { outcome: "scanned", report };
    } catch {
      // No scan in two days: a short call instead of another text.
      const { sessionId } = await step.do("Check-in call", ({ ctx }) =>
        ctx.startVoice({
          loopId: "check-in-call",
          to: phone,
          body: { reason },
        }),
      );
      const call = await step.waitForVoiceComplete({
        sessionId,
        timeout: "1 hour",
      });
      return { outcome: "called", summary: call.summary };
    }
  }
}