RetellAI MCP Server
A Model Context Protocol server implementation that enables AI assistants to interact with RetellAI's voice services for managing calls, agents, phone numbers, and voice options.
What is RetellAI MCP Server?
RetellAI MCP Server is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to model context protocol server implementation that enables ai assistants to interact with retellai's voice services for managing calls, agents, phone numbers, and voice options.
A Model Context Protocol server implementation that enables AI assistants to interact with RetellAI's voice services for managing calls, agents, phone numbers, and voice options.
This server falls under the Communication category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- A Model Context Protocol server implementation that enables
Use Cases
Maintainer
Works with
Installation
NPM
npx -y @abhaybabbar/retellai-mcp-serverManual Installation
npx -y @abhaybabbar/retellai-mcp-serverConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use RetellAI MCP Server
RetellAI MCP Server connects AI assistants to RetellAI's voice platform, exposing tools for managing phone calls, voice agents, phone numbers, and voice options through the Model Context Protocol. It allows Claude and other MCP clients to create outbound calls, provision and configure phone numbers, build and update AI voice agents with custom LLM configurations, list available voices, and retrieve call details — all through natural language instructions. This is ideal for developers building and managing voice AI applications on the RetellAI platform.
Prerequisites
- Node.js 16+ and npm installed
- A RetellAI account with an API key from https://dashboard.retellai.com/apiKey
- An MCP-compatible client such as Claude Desktop
- At least one phone number provisioned in RetellAI if you want to make outbound calls
Install the RetellAI MCP server package
Install the package from npm using npx for one-time use, or install it globally.
npx -y @abhaybabbar/retellai-mcp-serverObtain your RetellAI API key
Log in to the RetellAI dashboard and copy your API key from https://dashboard.retellai.com/apiKey. This key authenticates all API calls.
Add the server to Claude Desktop configuration
Open claude_desktop_config.json and add the RetellAI MCP server with your API key as an environment variable.
Restart Claude Desktop
Save the configuration file and restart Claude Desktop to initialize the MCP server with your credentials.
Verify by listing available voices
Ask Claude to list available RetellAI voices to confirm the connection and API key are working correctly.
RetellAI MCP Server Examples
Client configuration
Claude Desktop configuration for the RetellAI MCP server with your API key.
{
"mcpServers": {
"retellai": {
"command": "npx",
"args": ["-y", "@abhaybabbar/retellai-mcp-server"],
"env": {
"RETELL_API_KEY": "your_retellai_api_key_here"
}
}
}
}Prompts to try
Example prompts to manage RetellAI voice services through the MCP server.
- "List all available RetellAI voices"
- "Show me all my RetellAI agents"
- "List all phone numbers associated with my RetellAI account"
- "Create a new RetellAI agent named 'Support Bot' with a friendly voice"
- "Show me the details of my most recent calls"Troubleshooting RetellAI MCP Server
Authentication error or 401 Unauthorized response
Verify your RETELL_API_KEY is correct. Copy it directly from https://dashboard.retellai.com/apiKey and ensure there are no leading/trailing spaces in the config JSON.
npx takes too long on every Claude Desktop startup
Install the package globally to avoid re-downloading on each start: npm install -g @abhaybabbar/retellai-mcp-server — then use "command": "retellai-mcp-server" in the config instead of npx.
Cannot create outbound calls
Ensure you have a verified phone number provisioned in your RetellAI account. Outbound calls require an active phone number linked to an agent. Check the RetellAI dashboard under Phone Numbers.
Frequently Asked Questions about RetellAI MCP Server
What is RetellAI MCP Server?
RetellAI MCP Server is a Model Context Protocol (MCP) server that model context protocol server implementation that enables ai assistants to interact with retellai's voice services for managing calls, agents, phone numbers, and voice options. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install RetellAI MCP Server?
Install via npm with the command: npx -y @abhaybabbar/retellai-mcp-server. Then add the server configuration to your AI client's JSON config file (e.g., claude_desktop_config.json or .cursor/mcp.json).
Which AI clients work with RetellAI MCP Server?
RetellAI MCP Server works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is RetellAI MCP Server free to use?
Yes, RetellAI MCP Server is open source and available under the ISC License license. You can use it freely in both personal and commercial projects.
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Quick Config Preview
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