Imported from jeremylongshore/tons-of-skills-marketplace (
plugins/saas-packs/retellai-pack/skills/retellai-core-workflow-b/SKILL.md). Install upstream withnpx skills add jeremylongshore/tons-of-skills-marketplace --skill retellai-core-workflow-b. Copyright stays with the author (MIT).
Retell AI Core Workflow B
Overview
Manage phone calls: outbound campaigns, call transfers, recordings, and concurrent call handling.
Prerequisites
- Completed
retellai-core-workflow-a
Instructions
Step 1: Outbound Call Campaign
const phoneNumbers = ['+14155551001', '+14155551002', '+14155551003'];
for (const number of phoneNumbers) {
try {
const call = await retell.call.createPhoneCall({
from_number: process.env.RETELL_PHONE_NUMBER!,
to_number: number,
override_agent_id: agentId,
metadata: { campaign: 'appointment-reminder', date: '2026-04-01' },
});
console.log(`Called ${number}: ${call.call_id}`);
} catch (err) {
console.error(`Failed to call ${number}: ${err.message}`);
}
// Rate limit: space calls apart
await new Promise(r => setTimeout(r, 2000));
}Step 2: List and Filter Calls
const calls = await retell.call.list({
sort_order: 'descending',
limit: 20,
});
for (const call of calls) {
console.log(`${call.call_id}: ${call.call_status} — ${call.end_timestamp - call.start_timestamp}ms`);
}Step 3: Get Call Recording and Transcript
const callDetail = await retell.call.retrieve(callId);
if (callDetail.recording_url) {
console.log(`Recording: ${callDetail.recording_url}`);
}
if (callDetail.transcript) {
console.log(`Transcript:\n${callDetail.transcript}`);
}Output
- Outbound call campaign with rate limiting
- Call listing with status and duration
- Recordings and transcripts retrieved
Error Handling
| Error | Cause | Solution |
|---|---|---|
| Call fails immediately | Bad phone number format | Use E.164 format |
| No recording | Recording not enabled | Enable in agent settings |
| Concurrent limit | Too many active calls | Upgrade plan or queue calls |
Examples
Run a bounded outbound appointment reminder campaign
Upload only consented test contacts to a development campaign and set a small concurrency limit before enabling any production queue. For each test call, verify the E.164 number formatting, expected agent version, completion status, and redacted transcript retrieval. If a call result is ambiguous, query the call identifier before retrying so an operator does not create duplicate calls or overwrite the original outcome.
Resources
Next Steps
Handle call events: retellai-webhooks-events