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Krystal Voice Caller MCP server

by KrystalUnity·io.github.KrystalUnity/kvc-mcp·v0.1.1·1 stars
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Drive a Krystal Voice Caller tenant from Claude, Cursor, or any MCP-aware agent.

B71/100grade B
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Safety scan
B71/100

full report

Adoption
New

1 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

Krystal Voice Caller tools (12, 5 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • kvc_add_dnc

    Add an AU E.164 phone number to tenant DNC.

  • kvc_after_hours_captures

    Return recent reception captures.

  • kvc_call_history

    Return recent call outcomes.

  • kvc_chat_script_draftwrite action

    Send a message to an active Script Author draft.

  • kvc_create_script_draftwrite action

    Start a Script Author draft.

  • kvc_get_tenant

    Return current tenant config.

  • kvc_list_dnc

    List tenant DNC entries.

  • kvc_list_outbound_captures

    List captures from outbound Email Hunter calls.

  • kvc_place_test_call

    Place a test outbound roleplay call.

  • kvc_send_digest_nowwrite action

    Trigger an immediate digest email send.

  • kvc_update_tenantwrite action

    Patch safe tenant config fields.

  • kvc_upload_contactswrite action

    Upload CSV contacts for outbound Email Hunter.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan4 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 128 days ago8/15
  • Maintainer identityregistry namespace matches repository owner7/10
Overall 71/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Krystal Voice Caller compares

Against every graded Productivity MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
71/100
higher than 32% of 1,299 Productivity servers
Tools
12
the typical Productivity server has 7
Tools that change things
42%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
1
more than 50% of 854 Productivity servers

What its tools let an agent do: 7 read · 5 change

Install Krystal Voice Caller in Claude Code, Cursor or VS Code

claude mcp add kvc-mcp -- uvx kvc-mcp
Add to Cursor

What the publisher says

From the Krystal Voice Caller repository's README, as published. We do not edit it. Read it on GitHub

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:

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

Nothing above is checked by us. What we check is on the safety report.

Krystal Voice Caller: common questions

Is Krystal Voice Caller MCP server safe?
Mostly: it is graded B (71/100). Read the Krystal Voice Caller safety report
How do I install Krystal Voice Caller?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Krystal Voice Caller need an API key?
Yes. The registry entry asks for KVC_API_TOKEN.
Is Krystal Voice Caller maintained?
The last commit was 166 days ago (2026-05-22). The latest release is v0.1.1.
What can I use instead of Krystal Voice Caller?
Servers from other publishers that do the same job: Omnidim MCP server, Argent MCP server and gflow-cli MCP server.
How does Krystal Voice Caller compare with other Productivity MCP servers?
safety score 71/100 (higher than 32% of 1,299 Productivity servers); tools 12 (the typical Productivity server has 7); tools that change things 42% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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