coldstart-leads-mcp

Find customers from inside Claude. This MCP server connects Claude (or any MCP client) to Coldstart — live web lead search that returns real companies with verified emails and drafted outreach.

Describe who you sell to in one sentence. Get back potential customers — each with an email found on the company's own site and MX-verified, a phone number when one exists, and a first outreach email already drafted.

Quick start

You need a Coldstart API key — available on the Pro plan ($50/mo or $42/mo billed annually, 7-day free trial). Generate one at coldstart.so → dashboard → MCP → Generate key.

Claude Code — one command:

claude mcp add coldstart -e COLDSTART_API_KEY=cs_live_YOUR_KEY -- npx -y coldstart-leads-mcp

Claude Desktop — add to claude_desktop_config.json (Settings → Developer → Edit Config), then restart:

{
  "mcpServers": {
    "coldstart": {
      "command": "npx",
      "args": ["-y", "coldstart-leads-mcp"],
      "env": { "COLDSTART_API_KEY": "cs_live_YOUR_KEY" }
    }
  }
}

Then just ask: "use coldstart to find 10 leads for my web design agency".

Tools

| Tool | What it does | |------|--------------| | search_leads | Live web search for customers matching a business description (or a website URL). Optional targeting filters: country, state, company size, funding stage, revenue. Every lead's email is verified; a draft outreach email is included. | | list_leads | Your previously found leads with statuses and drafts. | | check_usage | Current month's search usage (Pro: 500 searches/month). |

After presenting leads, Claude asks which mode you want: full auto (rewrite drafts in your voice and send via your connected Gmail), draft & hold (you approve each email), or leads only. It can also set up a recurring schedule — search every few hours, dedup, save drafts for your morning review.

Configuration

| Env var | Required | Default | |---------|----------|---------| | COLDSTART_API_KEY | yes | — | | COLDSTART_API_URL | no | https://coldstart.so |

Links

• Coldstart — get an API key
• API & MCP docs
• Blog: guides on finding leads