Add vapi skill - Conversational voice AI calls

skills/vapi/vapi/SKILL.md

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+---
+name: vapi
+description: Conversational voice AI calls via Vapi. Make AI-powered phone calls for reservations, appointments, and more.
+homepage: https://vapi.ai
+metadata:
+  {
+    "openclaw":
+      {
+        "emoji": "📞",
+        "requires":
+          {
+            "bins": ["vapi"],
+          },
+        "install":
+          [
+            {
+              "id": "brew",
+              "kind": "brew",
+              "formula": "vapiai/tap/vapi-cli",
+              "bins": ["vapi"],
+              "label": "Install Vapi CLI (brew)",
+            },
+          ],
+      },
+  }
+---
+
+# Vapi
+
+Use Vapi for conversational AI voice calls. Perfect for restaurant reservations, appointment booking, and other interactive phone tasks.
+
+## Setup
+
+### Install CLI
+
+```bash
+brew install vapiai/tap/vapi-cli
+```
+
+### Authenticate
+
+```bash
+vapi auth
+```
+
+This opens the Vapi dashboard to get your API key.
+
+## Quick Start
+
+### 1. Create an Assistant
+
+```bash
+vapi assistant create \
+  --name "Restaurant Reservations" \
+  --model-provider openai \
+  --model gpt-4o \
+  --voice-provider elevenlabs \
+  --voice-id 21m00Tcm4TlvDq8ikWAM \
+  --system-prompt "You are a friendly reservation assistant..."
+```
+
+### 2. Make a Call
+
+```bash
+vapi call --assistant-id asst_xxx --to "+15551234567"
+```
+
+## Common Commands
+
+| Command | Description |
+|---------|-------------|
+| `vapi auth` | Authenticate with Vapi |
+| `vapi assistant create` | Create a new AI assistant |
+| `vapi assistant list` | List your assistants |
+| `vapi call --assistant-id X --to +1...` | Make outbound call |
+| `vapi call-logs` | View call history |
+
+## Example: Restaurant Booking
+
+```bash
+# Create the assistant
+vapi assistant create \
+  --name "Ema Austin Reservations" \
+  --system-prompt "You are calling to make a reservation at Ema, a Mediterranean restaurant in Austin's Domain. Get the caller's name, phone number, party size, date, and preferred time. Confirm all details before ending the call. Be friendly and professional." \
+  --model-provider openai \
+  --model gpt-4o \
+  --voice-provider elevenlabs \
+  --voice-id 21m00Tcm4TlvDq8ikWAM
+
+# Make the call
+vapi call \
+  --assistant-id asst_xxxxx \
+  --to "+15551234567" \
+  --message "Hi, I'd like to make a reservation for 2 people this Saturday evening."
+```
+
+## Voice Options
+
+Popular ElevenLabs voices:
+- `21m00Tcm4TlvDq8ikWAM` — Rachel (default)
+- `EXAVITQu4vr4xnSDxMaL` — Sarah
+- `CYw3kZ02Hs0563khs1Fj` — Arnold
+
+Full list: https://docs.vapi.ai/voice-dropdown
+
+## Pricing
+
+- Vapi platform: ~$0.10/min + platform fee
+- Voice providers (ElevenLabs, OpenAI): additional per-minute costs
+- Outbound calls use your imported phone number (Twilio/etc.)
+
+## Notes
+
+- Get an account at [dashboard.vapi.ai](https://dashboard.vapi.ai)
+- For outbound calls, import a Twilio number or buy one through Vapi
+- The assistant's system prompt defines its behavior