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-mcpClaude 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