How do I install Krystal Voice Caller?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Krystal Voice Caller need an API key?

The publisher lists these environment variables: KVC_API_TOKEN, KVC_BASE_URL.

What transport does Krystal Voice Caller use?

Krystal Voice Caller runs locally over stdio.

Krystal Voice Caller

Q: When was Krystal Voice Caller last checked?

Last checked 2026-10-16. Drive a Krystal Voice Caller tenant from Claude, Cursor, or any MCP-aware agent.

by io.github.KrystalUnity

Drive a Krystal Voice Caller tenant from Claude, Cursor, or any MCP-aware agent.

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Local command

uvx kvc-mcp==0.1.1

Credentials from the publisher

KVC_API_TOKEN — Bearer token starting with kvc_token_. Generate at https://krystalunity.com/voice/krystal-caller/dashboard/api-tokens
KVC_BASE_URL — API base URL (default https://krystalunity.com/api/admin/kvc).

Provider

Claude Code

KVC_API_TOKEN=<secret> KVC_BASE_URL=<value> claude mcp add io.github.krystalunity-kvc-mcp -- uvx kvc-mcp==0.1.1

Run in a terminal.

Claude Desktop

{
  "mcpServers": {
    "io.github.krystalunity-kvc-mcp": {
      "command": "uvx",
      "args": [
        "kvc-mcp==0.1.1"
      ],
      "env": {
        "KVC_API_TOKEN": "<secret>",
        "KVC_BASE_URL": "<value>"
      }
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Related MCP

Related skills

View all

kvc-mcp

MCP access is included with every Krystal Voice Caller tier. Use this package to manage a tenant from Claude, Cursor, or any MCP-aware agent.

mcp-name: io.github.KrystalUnity/kvc-mcp

Install

pip install kvc-mcp

Configure

Create or rotate an API token in the Krystal Voice Caller dashboard, then set:

export KVC_API_TOKEN="kvc_token_..."
export KVC_BASE_URL="https://krystalunity.com/api/admin/kvc"

Cursor example:

{
  "mcpServers": {
    "krystal-voice-caller": {
      "command": "kvc-mcp",
      "env": {
        "KVC_API_TOKEN": "kvc_token_..."
      }
    }
  }
}

Tools

The server exposes tenant config, DNC, call history, reception captures, digest send-now, Script Author draft chat, contact upload, outbound captures, and test-call tools. Product availability is enforced by the Krystal Voice Caller API, so Reception-only tenants get inbound/reception tools and Bundle/Premium tenants get outbound Email Hunter tools.

Script approval is not exposed through MCP. Approval stays admin-only in the web UI.

Publish

Operator-only steps:

cd packages/kvc-mcp && uv build
uv publish --username __token__ --password "$PYPI_TOKEN"
Submit an MCP Registry entry named io.github.KrystalUnity/kvc-mcp pointing at the PyPI package.
Verify from a fresh venv with pip install kvc-mcp && kvc-mcp --help.