vapi-calls – OpenClaw Skill

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name: vapi-calls description: Advanced AI voice assistant for phone calls. Capable of persuasion, sales, restaurant bookings, reminders, and notifications. emoji: 📞 author: César Morillas version: 1.0.0 license: MIT repository: https://github.com/vapi-ai/openclaw-vapi-calls requires: env: - VAPI_API_KEY - VAPI_ASSISTANT_ID - VAPI_PHONE_NUMBER_ID - WEBHOOK_BASE_URL bins: - python3 pip: - requests tools:

• name: make_vapi_call description: Triggers an autonomous AI phone call with a specific mission and waits for the final report. parameters: type: object properties: phone_number: type: string description: "Recipient's phone number (E.164 format, e.g., +34669000000)." first_message: type: string description: "Initial greeting. Use 'DEFAULT' to use the agent's configured greeting." system_prompt: type: string description: "AI instructions. Use 'DEFAULT' to use the agent's configured model/prompt. If custom text is provided, the call will force GPT-4o Mini + endCall tool." end_message: type: string description: "Optional. Final phrase. Use 'DEFAULT' to skip override." required: [phone_number, first_message, system_prompt]

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Vapi Calls - Agent Instructions

Use this skill to perform any task that requires voice interaction over the phone.

Configuration & Network Requirements

⚠️ IMPORTANT: This skill requires your machine to be reachable from the internet to receive real-time call updates.

1. Environment Variables

Configure these in your OpenClaw config.json (or Gateway env):

• VAPI_API_KEY: Your Vapi Private API Key.
• VAPI_ASSISTANT_ID: The ID of the Vapi Assistant to use as a base.
• VAPI_PHONE_NUMBER_ID: The ID of the Vapi Phone Number.
• WEBHOOK_BASE_URL: Crucial. The public HTTPS URL where this agent is reachable (e.g., https://my-claw.com or https://xyz.ngrok-free.app). Do not include a trailing slash.
• WEBHOOK_PORT (Optional): The local port to listen on (Default: 4430).
• VAPI_LLM_PROVIDER: (Optional) Provider for Custom Mode (Default: openai).
• VAPI_LLM_MODEL: (Optional) Model for Custom Mode (Default: gpt-4o-mini).

2. Connectivity Setup

You must expose the WEBHOOK_PORT (default 4430) to the internet.

Option A: Cloudflare Tunnel (Recommended) cloudflared tunnel --url http://localhost:4430

Option B: Ngrok ngrok http 4430

Set WEBHOOK_BASE_URL to the generated URL (e.g., https://random-name.trycloudflare.com).

Usage

Custom Mission (Dynamic)

Provide a specific system_prompt. The system will automatically use GPT-4o Mini and enable the endCall tool. The AI will be able to hang up autonomously.

Native Agent (Static)

Pass "DEFAULT" for first_message, system_prompt, and end_message. The system will use the exact configuration (Model, Voice, Prompt) defined in the Vapi Dashboard.

Troubleshooting

• Call hangs / No report: Check if WEBHOOK_BASE_URL is reachable from the internet. The Python script spins up a temporary server on WEBHOOK_PORT only during the call.
• API 400 Error: Check your VAPI_PHONE_NUMBER_ID and VAPI_ASSISTANT_ID.