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Patter MCP Server

An always-online MCP server that gives Claude Code and Claude Desktop the ability to make and receive real phone calls.

GitHub Repository

View the source code and full documentation.

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Installation

git clone https://github.com/PatterAI/patter-mcp
cd patter-mcp
npm install
cp .env.example .env   # fill in your API keys

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Start the Server

npm run dev    # development
# or
npm run build && npm start   # production

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Connect Claude Code

claude mcp add --transport http patter-mcp http://localhost:3000/mcp

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MCP Tools

ToolDescription
make_callPlace an outbound call with an AI voice agent
call_third_partyCall a third party with an autonomous task
get_callsList all calls with status, duration, and cost
get_transcriptGet the full transcript of a call

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Claude Code Integration

During a phone call, the voice agent has access to a full Claude Code session via the Agent SDK. The agent can:
  • Read, write, and edit files
  • Run shell commands and tests
  • Search codebases
  • Create git commits
  • Anything Claude Code can do interactively

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Environment Variables

VariableRequiredDescription
TWILIO_ACCOUNT_SIDYesTwilio account SID
TWILIO_AUTH_TOKENYesTwilio auth token
TWILIO_PHONE_NUMBERYesYour Twilio number (E.164)
OPENAI_API_KEYYesOpenAI API key
DEEPGRAM_API_KEYYesDeepgram STT key
ELEVENLABS_API_KEYYesElevenLabs TTS key

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Example

Ask Claude:
“Call +15551234567 and ask them about their order status”
“Call this restaurant and ask if there’s a table for 2 tonight”
“Show me the transcript from the last call”