Agent skill

create-call

Create outbound phone calls, web calls, and batch calls using the Vapi API. Use when making automated calls, testing voice assistants, scheduling call campaigns, or initiating conversations programmatically.

View SKILL.md on GitHub Repository
Stars 163
Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/create-call

Metadata

Additional technical details for this skill

author
vapi
version
1.0

SKILL.md

Vapi Call Creation

Initiate outbound phone calls, web calls, and batch calls using Vapi's API. Connect your voice assistants to real phone numbers and test them programmatically.

Setup: Ensure VAPI_API_KEY is set. See the setup-api-key skill if needed.

Quick Start — Outbound Phone Call

cURL

bash
curl -X POST https://api.vapi.ai/call \
  -H "Authorization: Bearer $VAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "assistantId": "your-assistant-id",
    "phoneNumberId": "your-phone-number-id",
    "customer": {
      "number": "+11234567890"
    }
  }'

TypeScript (Server SDK)

typescript
import { VapiClient } from "@vapi-ai/server-sdk";

const vapi = new VapiClient({ token: process.env.VAPI_API_KEY! });

const call = await vapi.calls.create({
  assistantId: "your-assistant-id",
  phoneNumberId: "your-phone-number-id",
  customer: {
    number: "+11234567890",
  },
});

console.log("Call created:", call.id);

Python

python
import requests
import os

response = requests.post(
    "https://api.vapi.ai/call",
    headers={
        "Authorization": f"Bearer {os.environ['VAPI_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={
        "assistantId": "your-assistant-id",
        "phoneNumberId": "your-phone-number-id",
        "customer": {"number": "+11234567890"},
    },
)

call = response.json()
print(f"Call initiated: {call['id']}")

Call Types

Outbound Phone Call

Requires an assistant, a Vapi phone number, and a customer number.

json
{
  "assistantId": "assistant-id",
  "phoneNumberId": "phone-number-id",
  "customer": {
    "number": "+11234567890",
    "name": "John Doe",
    "numberE164CheckEnabled": true
  }
}

Web Call

For browser-based calls — no phone number needed. Use the Vapi Web SDK on the client side.

json
{
  "assistantId": "assistant-id"
}

Client-side (JavaScript):

javascript
import Vapi from "@vapi-ai/web";

const vapi = new Vapi("your-public-key");
vapi.start("your-assistant-id");

Transient Assistant Call

Define an assistant inline instead of referencing a saved one:

json
{
  "assistant": {
    "name": "Quick Test",
    "firstMessage": "Hello! This is a test call.",
    "model": {
      "provider": "openai",
      "model": "gpt-4.1",
      "messages": [
        {
          "role": "system",
          "content": "You are a test assistant. Confirm the call is working and end politely."
        }
      ]
    },
    "voice": { "provider": "vapi", "voiceId": "Elliot" },
    "transcriber": { "provider": "deepgram", "model": "nova-3", "language": "en" }
  },
  "phoneNumberId": "phone-number-id",
  "customer": {
    "number": "+11234567890"
  }
}

Scheduled Calls

Schedule a call for a future time:

json
{
  "assistantId": "assistant-id",
  "phoneNumberId": "phone-number-id",
  "customer": {
    "number": "+11234567890"
  },
  "schedulePlan": {
    "earliestAt": "2025-06-15T14:00:00Z",
    "latestAt": "2025-06-15T15:00:00Z"
  }
}
  • earliestAt — Earliest time to attempt the call (ISO 8601)
  • latestAt — Latest time to attempt the call (optional)
  • If using assistantId, the latest version of the assistant is used at call time
  • For a fixed assistant config, use assistant (transient) instead

Batch Calls

Call multiple numbers in one request:

json
{
  "assistantId": "assistant-id",
  "phoneNumberId": "phone-number-id",
  "customers": [
    { "number": "+11234567890", "name": "Alice" },
    { "number": "+10987654321", "name": "Bob" },
    { "number": "+15551234567", "name": "Carol" }
  ]
}

Combine with schedulePlan for scheduled batch calls.

Call with Metadata

Pass custom data accessible during the call:

json
{
  "assistantId": "assistant-id",
  "phoneNumberId": "phone-number-id",
  "customer": {
    "number": "+11234567890"
  },
  "metadata": {
    "orderId": "ORD-12345",
    "department": "billing"
  }
}

Managing Calls

bash
# List calls
curl "https://api.vapi.ai/call?limit=10" \
  -H "Authorization: Bearer $VAPI_API_KEY"

# Get a specific call
curl https://api.vapi.ai/call/{id} \
  -H "Authorization: Bearer $VAPI_API_KEY"

# Get call with transcript and recording
curl https://api.vapi.ai/call/{id} \
  -H "Authorization: Bearer $VAPI_API_KEY"
# Response includes: transcript, recordingUrl, summary, costBreakdown

# Delete a call
curl -X DELETE https://api.vapi.ai/call/{id} \
  -H "Authorization: Bearer $VAPI_API_KEY"

Call Response

A successful call creation returns:

json
{
  "id": "call-uuid",
  "orgId": "org-uuid",
  "type": "outboundPhoneCall",
  "status": "queued",
  "assistantId": "assistant-id",
  "phoneNumberId": "phone-number-id",
  "customer": {
    "number": "+11234567890"
  },
  "createdAt": "2025-01-15T10:00:00Z"
}

Call statuses: queued → ringing → in-progress → ended

Compliance Warning

It is a violation of FCC law to dial phone numbers without consent in an automated manner. Review TCPA consent requirements before launching automated call campaigns.

References

Additional Resources

This skills repository includes a Vapi documentation MCP server (vapi-docs) that gives your AI agent access to the full Vapi knowledge base. Use the searchDocs tool to look up anything beyond what this skill covers — advanced configuration, troubleshooting, SDK details, and more.

Auto-configured: If you cloned or installed these skills, the MCP server is already configured via .mcp.json (Claude Code), .cursor/mcp.json (Cursor), or .vscode/mcp.json (VS Code Copilot).

Manual setup: If your agent doesn't auto-detect the config, run:

bash
claude mcp add vapi-docs -- npx -y mcp-remote https://docs.vapi.ai/_mcp/server

See the README for full setup instructions across all supported agents.

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