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Voice Agent Builder Pro

Build and manage Voice AI agents using Vapi, Bland.ai, or Retell. Create agents, configure voices, set prompts, make outbound calls, and retrieve transcripts...

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High Signal

Build and manage Voice AI agents using Vapi, Bland.ai, or Retell. Create agents, configure voices, set prompts, make outbound calls, and retrieve transcripts...

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Install for OpenClaw

Quick setup
  1. Download the package from Yavira.
  2. Extract the archive and review SKILL.md first.
  3. Import or place the package into your OpenClaw setup.

Requirements

Target platform
OpenClaw
Install method
Manual import
Extraction
Extract archive
Prerequisites
OpenClaw
Primary doc
SKILL.md

Package facts

Download mode
Yavira redirect
Package format
ZIP package
Source platform
Tencent SkillHub
What's included
SKILL.md, scripts/vapi_agent.py, scripts/voice_comparison.md

Validation

  • Use the Yavira download entry.
  • Review SKILL.md after the package is downloaded.
  • Confirm the extracted package contains the expected setup assets.

Install with your agent

Agent handoff

Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.

  1. Download the package from Yavira.
  2. Extract it into a folder your agent can access.
  3. Paste one of the prompts below and point your agent at the extracted folder.
New install

I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete.

Upgrade existing

I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run.

Trust & source

Release facts

Source
Tencent SkillHub
Verification
Indexed source record
Version
1.0.0

Documentation

ClawHub primary doc Primary doc: SKILL.md 13 sections Open source page

Voice Agent Builder

Build, configure, and manage Voice AI agents. Supports Vapi (primary), Bland.ai, and Retell platforms.

Quick Start

export VAPI_API_KEY="your-vapi-api-key" # Create a voice agent python3 {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."}' # Make an outbound call python3 {baseDir}/scripts/vapi_agent.py call '{"assistantId":"asst_xxx","phoneNumberId":"pn_xxx","customer":{"number":"+15551234567"}}' # List agents python3 {baseDir}/scripts/vapi_agent.py list-agents # List calls python3 {baseDir}/scripts/vapi_agent.py list-calls

Platform Comparison

FeatureVapiBland.aiRetellBest ForCustom agents, dev-friendlySimple outbound campaignsEnterprise, low latencyLatency~800ms~500ms~500msLanguages100+30+30+Custom LLM✅ Any OpenAI-compatible✅ Limited✅ Via APIPhone NumbersBuy/importBuy/importBuy/importPricing$0.05/min + provider costs$0.09/min all-in$0.07-0.15/minWebSocket✅❌✅Knowledge Base✅ Built-in✅✅Transfers✅✅✅ Recommendation: Start with Vapi — most flexible, best docs, largest community. Use Bland for simple high-volume outbound. Use Retell for enterprise low-latency needs. See {baseDir}/scripts/voice_comparison.md for detailed breakdown.

1. Choose a Voice

Vapi supports multiple TTS providers: ElevenLabs — Best quality, most natural (recommended) PlayHT — Good quality, lower cost Deepgram — Fast, good for real-time Azure — Enterprise, many languages

2. Configure the Agent

{ "name": "Appointment Setter", "firstMessage": "Hi! This is Sarah from Dr. Smith's office. I'm calling to help you schedule your appointment.", "systemPrompt": "You are Sarah, a friendly appointment scheduler...", "voice": { "provider": "11labs", "voiceId": "21m00Tcm4TlvDq8ikWAM" }, "model": { "provider": "openai", "model": "gpt-4o", "temperature": 0.7 }, "endCallFunctionEnabled": true, "maxDurationSeconds": 300, "silenceTimeoutSeconds": 30 }

3. Prompt Engineering for Voice

Voice prompts differ from text. Key principles: Keep responses SHORT — 1-2 sentences max per turn Be conversational — use filler words naturally ("Sure thing!", "Got it!") Handle interruptions — voice agents get cut off, design for it Confirm understanding — repeat back key info (names, numbers, dates) Include fallback — "I didn't catch that, could you repeat?"

4. Phone Number Setup

# List available phone numbers python3 {baseDir}/scripts/vapi_agent.py list-phones # Buy a number (via Vapi dashboard or API) # Import existing number (Twilio, Vonage) python3 {baseDir}/scripts/vapi_agent.py import-phone '{"provider":"twilio","number":"+15551234567","twilioAccountSid":"AC...","twilioAuthToken":"..."}'

5. Call Handling

Outbound calls: python3 {baseDir}/scripts/vapi_agent.py call '{"assistantId":"asst_xxx","phoneNumberId":"pn_xxx","customer":{"number":"+15551234567"}}' Inbound: Assign agent to phone number in Vapi dashboard, or via API: python3 {baseDir}/scripts/vapi_agent.py update-phone '{"id":"pn_xxx","assistantId":"asst_xxx"}'

Voice + CRM (GHL)

Voice agent qualifies lead on call Use Vapi's serverUrl webhook to capture call data On call end → create/update GHL contact Move opportunity to appropriate pipeline stage Schedule follow-up if needed

Voice + Calendar Booking

Agent checks availability via calendar API Uses function calling to book appointment Confirms date/time verbally Sends SMS confirmation after call

Voice + Knowledge Base

Upload documents to Vapi's knowledge base for RAG: python3 {baseDir}/scripts/vapi_agent.py create-kb '{"name":"Product FAQ","files":["faq.pdf"]}'

Available Commands

python3 {baseDir}/scripts/vapi_agent.py create-agent '{...}' # Create new agent python3 {baseDir}/scripts/vapi_agent.py get-agent <id> # Get agent details python3 {baseDir}/scripts/vapi_agent.py list-agents # List all agents python3 {baseDir}/scripts/vapi_agent.py update-agent <id> '{...}' # Update agent python3 {baseDir}/scripts/vapi_agent.py delete-agent <id> # Delete agent python3 {baseDir}/scripts/vapi_agent.py call '{...}' # Make outbound call python3 {baseDir}/scripts/vapi_agent.py get-call <id> # Get call details python3 {baseDir}/scripts/vapi_agent.py list-calls # List all calls python3 {baseDir}/scripts/vapi_agent.py list-phones # List phone numbers python3 {baseDir}/scripts/vapi_agent.py import-phone '{...}' # Import phone number python3 {baseDir}/scripts/vapi_agent.py update-phone '{...}' # Update phone config

Credits

Built by M. Abidi | agxntsix.ai YouTube | GitHub Part of the AgxntSix Skill Suite for OpenClaw agents. 📅 Need help setting up OpenClaw for your business? Book a free consultation

Category context

Code helpers, APIs, CLIs, browser automation, testing, and developer operations.

Source: Tencent SkillHub

Largest current source with strong distribution and engagement signals.

Package contents

Included in package
2 Docs1 Scripts
  • SKILL.md Primary doc
  • scripts/voice_comparison.md Docs
  • scripts/vapi_agent.py Scripts