CallerKit MCP Server

by callerkitcom.caller-kit/callerkit-mcpv0.3.0

Caller ID and phone lookup: names, spam reports, fraud risk score, name/email search.

Node.jsstdioremoteofficial registry

context tax

pending

security

pending

cold start

pending

freshness

pending

Our reading of CallerKit, from the data

CallerKit is a email MCP server from callerkit, listed in the official MCP Registry.

We haven't measured its tool list yet, so its token cost is unknown.

It runs either locally over stdio or as a hosted endpoint and needs one secret (CALLERKIT_API_KEY); use a scoped, least-privilege key.

Install CallerKit MCP server

claude mcp add callerkit -e CALLERKIT_API_KEY='<callerkit-api-key>' -- npx -y callerkit-mcp

{
  "mcpServers": {
    "callerkit": {
      "command": "npx",
      "args": [
        "-y",
        "callerkit-mcp"
      ],
      "env": {
        "CALLERKIT_API_KEY": "<callerkit-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "callerkit": {
      "command": "npx",
      "args": [
        "-y",
        "callerkit-mcp"
      ],
      "env": {
        "CALLERKIT_API_KEY": "<callerkit-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "callerkit": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "callerkit-mcp"
      ],
      "env": {
        "CALLERKIT_API_KEY": "<callerkit-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "callerkit": {
      "command": "npx",
      "args": [
        "-y",
        "callerkit-mcp"
      ],
      "env": {
        "CALLERKIT_API_KEY": "<callerkit-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
CALLERKIT_API_KEY	yes	yes	Your CallerKit API key, from https://caller-kit.com dashboard
CALLERKIT_BASE_URL	—	—	CallerKit API base URL

Remote endpoints

streamable-httphttps://mcp.caller-kit.com/mcp

Freshness

Not enough public signals yet to judge maintenance.

Last commit (default branch)
no data · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-10-11 · 7d ago · official registry · v0.3.0

How it compares in Email

Against the most-starred email servers we index. Token cost is per model turn, measured from each server's live tool list.

Server	Stars	Tools	Tokens / turn	Freshness	Runs
CallerKit (this)	—	—	not measured	—	local + hosted
Inbox Zero	12,649	—	not measured	Active	hosted
Useplunk	5,524	—	not measured	—	local
Google Workspace	3,370	—	not measured	Active	—
OpenOSINT	1,776	—	not measured	Active	local
emailmd	1,382	3	954	Active	local + hosted

All email MCP servers

FAQ

›How do I install the CallerKit MCP server in Claude Code?

Run: claude mcp add callerkit -e CALLERKIT_API_KEY='<callerkit-api-key>' -- npx -y callerkit-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does CallerKit require an API key?

Yes. It expects CALLERKIT_API_KEY, of which 1 is a secret.

›Can I use CallerKit as a remote (hosted) MCP server?

Yes — it offers both a hosted endpoint and a local stdio package.

›Is CallerKit in the official MCP registry?

Yes, as com.caller-kit/callerkit-mcp.

Sources and method

Official MCP Registry entry: updated 2026-10-11
Package registry (npm / PyPI): listed
Last checked against all sources: 2026-10-19

The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.