Telnyx Local Model Context Protocol (MCP) Server

Official Telnyx Local Model Context Protocol (MCP) Server that enables interaction with powerful telephony, messaging, and AI assistant APIs. This server allows MCP clients like Claude Desktop, Cursor, Windsurf, OpenAI Agents and others to manage phone numbers, send messages, make calls, and create AI assistants.

Quickstart with Claude Desktop

1. Get your API key from the Telnyx Portal.
2. Install uvx (Python package manager), install with curl -LsSf https://astral.sh/uv/install.sh | sh , brew install uv or see the uv repo for additional install methods.
3. Go to Claude > Settings > Developer > Edit Config > claude_desktop_config.json to include the following:

{
  "mcpServers": {
    "Telnyx": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/team-telnyx/telnyx-mcp-server.git", "telnyx-mcp-server"],
      "env": {
        "TELNYX_API_KEY": "<insert-your-api-key-here>"
      }
    }
  }
}

If you're using Windows, you will have to enable "Developer Mode" in Claude Desktop to use the MCP server. Click "Help" in the hamburger menu at the top left and select "Enable Developer Mode".

Running After Download

1. Get your API key from the Telnyx Portal.

2. Install uvx (Python package manager), install with curl -LsSf https://astral.sh/uv/install.sh | sh , brew install uv or see the uv repo for additional install methods.

3. Clone the Git Repository
   Use Git to download the Telnyx MCP Server locally:

   git clone https://github.com/team-telnyx/telnyx-mcp-server.git
   cd telnyx-mcp-server
   

4. Configure and Run with uvx
   In your Claude config, you can reference the local folder by using the --from argument. For example:

   {
     "mcpServers": {
       "Telnyx": {
         "command": "uvx",
         "args": ["--from", "/path/to/telnyx-mcp-server", "telnyx-mcp-server"],
         "env": {
           "TELNYX_API_KEY": "<insert-your-api-key-here>"
         }
       }
     }
   }
   

5. This instructs Claude to run the server from the folder you cloned. Replace “/path/to/telnyx-mcp-server” with the actual location of the repository.

Available Tools

Assistant Tools

• Create AI assistants with custom instructions and configurations
• List existing assistants
• Get assistant details
• Update assistant properties
• Delete assistants
• Get assistant TEXML configurations

Call Control Tools

• Make outbound phone calls
• Hang up active calls
• Transfer calls to new destinations
• Play audio files during calls
• Stop audio playback
• Send DTMF tones
• Speak text using text-to-speech

Messaging Tools

• Send SMS and MMS messages
• Get message details

Phone Number Tools

• List your phone numbers
• Buy new phone numbers
• Update phone number configurations
• List available phone numbers

Connection Tools

• List voice connections
• Get connection details
• Update connection configurations

Example Usage

Try asking Claude:

• "Create an AI agent that can handle customer service for an e-commerce business"
• "Send a text message to +5555551234 saying 'Your appointment is confirmed for tomorrow at 3pm'"
• "Make a call to my customer at +5555551234 and transfer them to my support team"
• "Find me a phone number in Chicago with area code 312"
• "Create an auto-attendant system using Telnyx AI assistants and voice features"

Coming Soon

Telnyx is working on a remote MCP implementation with OAuth authentication based on the latest MCP specification. This will enable access to Telnyx's powerful communications APIs through a remotely hosted server without having to run the MCP server locally.

Contributing

If you want to contribute or run from source:

1. Clone the repository:

git clone https://github.com/team-telnyx/telnyx-mcp-server.git
cd telnyx-mcp-server

2. Create a virtual environment and install dependencies using uv:

uv venv
source .venv/bin/activate
uv pip install -e .

3. Create a .env file and add your Telnyx API key:

echo "TELNYX_API_KEY=YOUR_API_KEY" > .env

4. Run the tests to make sure everything is working:

pytest

5. Install the server in Claude Desktop: mcp install src/telnyx_mcp_server/server.py
6. Debug and test locally with MCP Inspector: mcp dev src/telnyx_mcp_server/server.py

Troubleshooting

Logs when running with Claude Desktop can be found at:

• Windows: %APPDATA%\Claude\logs\mcp-server-telnyx.log
• macOS: ~/Library/Logs/Claude/mcp-server-telnyx.log

MCP Telnyx: spawn uvx ENOENT

If you encounter the error "MCP Telnyx: spawn uvx ENOENT", confirm its absolute path by running this command in your terminal:

which uvx

Once you obtain the absolute path (e.g., /usr/local/bin/uvx), update your configuration to use that path (e.g., "command": "/usr/local/bin/uvx"). This ensures that the correct executable is referenced.