What is Krystal Voice Caller?

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

How do I install Krystal Voice Caller?

Install Krystal Voice Caller via the package manager from https://pypi.org, then add the server config to your MCP client (Claude Desktop, Cursor, or VS Code).

Is Krystal Voice Caller open source?

Yes, Krystal Voice Caller is open source under the MIT license. Source code is available at https://github.com/KrystalUnity/kvc-mcp.

What category does Krystal Voice Caller belong to?

Krystal Voice Caller is listed under Other MCP servers on MCPFind.

Krystal Voice Caller — MCP Server for Other

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.

Set up in your AI client

AI clientOperating system

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json

{
  "mcpServers": {
    "io-github-krystalunity-kvc-mcp": {
      "command": "uvx",
      "args": [
        "kvc-mcp"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Compatible MCP Clients

Krystal Voice Caller works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.

Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.

VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.

Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.

Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

Krystal Voice Caller