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Create agents, configure voices, set prompts, make outbound calls, and retrieve transcripts. Includes platform comparison guide. Use when building phone agents, IVR systems, or voice-first customer service.\nhomepage: https://www.agxntsix.ai\nlicense: MIT\ncompatibility: Python 3.10+, Vapi API key\nmetadata: {\"openclaw\": {\"emoji\": \"\\ud83d\\udde3\\ufe0f\", \"requires\": {\"env\": [\"VAPI_API_KEY\"]}, \"primaryEnv\": \"VAPI_API_KEY\", \"homepage\": \"https://www.agxntsix.ai\"}}\n---\n\n# Voice Agent Builder\n\nBuild, configure, and manage Voice AI agents. Supports **Vapi** (primary), **Bland.ai**, and **Retell** platforms.\n\n## Quick Start\n\n```bash\nexport VAPI_API_KEY=\"your-vapi-api-key\"\n\n# Create a voice agent\npython3 {baseDir}/scripts/vapi_agent.py create-agent '{\"name\":\"Sales Agent\",\"firstMessage\":\"Hi! How can I help you today?\",\"systemPrompt\":\"You are a helpful sales assistant for Acme Corp.\"}'\n\n# Make an outbound call\npython3 {baseDir}/scripts/vapi_agent.py call '{\"assistantId\":\"asst_xxx\",\"phoneNumberId\":\"pn_xxx\",\"customer\":{\"number\":\"+15551234567\"}}'\n\n# List agents\npython3 {baseDir}/scripts/vapi_agent.py list-agents\n\n# List calls\npython3 {baseDir}/scripts/vapi_agent.py list-calls\n```\n\n## Platform Comparison\n\n| Feature | Vapi | Bland.ai | Retell |\n|---------|------|----------|--------|\n| **Best For** | Custom agents, dev-friendly | Simple outbound campaigns | Enterprise, low latency |\n| **Latency** | ~800ms | ~500ms | ~500ms |\n| **Languages** | 100+ | 30+ | 30+ |\n| **Custom LLM** | ✅ Any OpenAI-compatible | ✅ Limited | ✅ Via API |\n| **Phone Numbers** | Buy/import | Buy/import | Buy/import |\n| **Pricing** | $0.05/min + provider costs | $0.09/min all-in | $0.07-0.15/min |\n| **WebSocket** | ✅ | ❌ | ✅ |\n| **Knowledge Base** | ✅ Built-in | ✅ | ✅ |\n| **Transfers** | ✅ | ✅ | ✅ |\n\n**Recommendation:** Start with **Vapi** — most flexible, best docs, largest community. Use **Bland** for simple high-volume outbound. Use **Retell** for enterprise low-latency needs.\n\nSee `{baseDir}/scripts/voice_comparison.md` for detailed breakdown.\n\n## Agent Creation Workflow\n\n### 1. Choose a Voice\nVapi supports multiple TTS providers:\n- **ElevenLabs** — Best quality, most natural (recommended)\n- **PlayHT** — Good quality, lower cost\n- **Deepgram** — Fast, good for real-time\n- **Azure** — Enterprise, many languages\n\n### 2. Configure the Agent\n```json\n{\n  \"name\": \"Appointment Setter\",\n  \"firstMessage\": \"Hi! This is Sarah from Dr. Smith's office. I'm calling to help you schedule your appointment.\",\n  \"systemPrompt\": \"You are Sarah, a friendly appointment scheduler...\",\n  \"voice\": {\n    \"provider\": \"11labs\",\n    \"voiceId\": \"21m00Tcm4TlvDq8ikWAM\"\n  },\n  \"model\": {\n    \"provider\": \"openai\",\n    \"model\": \"gpt-4o\",\n    \"temperature\": 0.7\n  },\n  \"endCallFunctionEnabled\": true,\n  \"maxDurationSeconds\": 300,\n  \"silenceTimeoutSeconds\": 30\n}\n```\n\n### 3. Prompt Engineering for Voice\n\nVoice prompts differ from text. Key principles:\n- **Keep responses SHORT** — 1-2 sentences max per turn\n- **Be conversational** — use filler words naturally (\"Sure thing!\", \"Got it!\")\n- **Handle interruptions** — voice agents get cut off, design for it\n- **Confirm understanding** — repeat back key info (names, numbers, dates)\n- **Include fallback** — \"I didn't catch that, could you repeat?\"\n\n### 4. Phone Number Setup\n```bash\n# List available phone numbers\npython3 {baseDir}/scripts/vapi_agent.py list-phones\n\n# Buy a number (via Vapi dashboard or API)\n# Import existing number (Twilio, Vonage)\npython3 {baseDir}/scripts/vapi_agent.py import-phone '{\"provider\":\"twilio\",\"number\":\"+15551234567\",\"twilioAccountSid\":\"AC...\",\"twilioAuthToken\":\"...\"}'\n```\n\n### 5. Call Handling\n\n**Outbound calls:**\n```bash\npython3 {baseDir}/scripts/vapi_agent.py call '{\"assistantId\":\"asst_xxx\",\"phoneNumberId\":\"pn_xxx\",\"customer\":{\"number\":\"+15551234567\"}}'\n```\n\n**Inbound:** Assign agent to phone number in Vapi dashboard, or via API:\n```bash\npython3 {baseDir}/scripts/vapi_agent.py update-phone '{\"id\":\"pn_xxx\",\"assistantId\":\"asst_xxx\"}'\n```\n\n## Integration Patterns\n\n### Voice + CRM (GHL)\n1. Voice agent qualifies lead on call\n2. Use Vapi's `serverUrl` webhook to capture call data\n3. On call end → create/update GHL contact\n4. Move opportunity to appropriate pipeline stage\n5. Schedule follow-up if needed\n\n### Voice + Calendar Booking\n1. Agent checks availability via calendar API\n2. Uses function calling to book appointment\n3. Confirms date/time verbally\n4. Sends SMS confirmation after call\n\n### Voice + Knowledge Base\nUpload documents to Vapi's knowledge base for RAG:\n```bash\npython3 {baseDir}/scripts/vapi_agent.py create-kb '{\"name\":\"Product FAQ\",\"files\":[\"faq.pdf\"]}'\n```\n\n## Available Commands\n\n```bash\npython3 {baseDir}/scripts/vapi_agent.py create-agent '{...}'     # Create new agent\npython3 {baseDir}/scripts/vapi_agent.py get-agent <id>            # Get agent details\npython3 {baseDir}/scripts/vapi_agent.py list-agents               # List all agents\npython3 {baseDir}/scripts/vapi_agent.py update-agent <id> '{...}' # Update agent\npython3 {baseDir}/scripts/vapi_agent.py delete-agent <id>         # Delete agent\npython3 {baseDir}/scripts/vapi_agent.py call '{...}'              # Make outbound call\npython3 {baseDir}/scripts/vapi_agent.py get-call <id>             # Get call details\npython3 {baseDir}/scripts/vapi_agent.py list-calls                # List all calls\npython3 {baseDir}/scripts/vapi_agent.py list-phones               # List phone numbers\npython3 {baseDir}/scripts/vapi_agent.py import-phone '{...}'      # Import phone number\npython3 {baseDir}/scripts/vapi_agent.py update-phone '{...}'      # Update phone config\n```\n\n## Credits\nBuilt by [M. 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