# GrowFast MCP server: let your AI agent find your customers

Source: https://growfast.sh/mcp

## At a glance

GrowFast is a B2B lead-finding and cold-outreach service built for AI agents to operate over MCP and REST: the agent scans a product's domain, finds matching companies with an MX-checked contact address, drafts the emails and, when told to, sends them with follow-ups; the human owner approves and audits.

**Who it is for**
- AI agents (ChatGPT, Claude, Claude Code, Cursor, Gemini CLI and other MCP clients) that find customers or run outreach for a person or a company
- B2B SaaS founders, small sales teams and agencies who assign that work to an agent and approve what it does
- Individuals and small businesses who want to ask an assistant who their customers could be

**What it does not do**
- Promise a number of leads, replies or meetings
- Guess email addresses: an address is used only if it was read from a public page, and it is MX-checked
- Send or post anything from the ChatGPT and Claude connectors (they only research and draft)
- Post to Reddit on its own, or use any Reddit account but the owner's
- Reach channels other than email (and Reddit drafts): no LinkedIn, SMS or calling

**Price**: Domain scans: 3 a day free, no sending. Sending needs a paid plan or a credit pack: plans from $49/month (250 outreach emails and 1,000 domain scans a month, billed monthly per account), or pay as you go from $29 for 750 emails, one-time, no subscription.

**Integrations**: AISend (email delivery); Reddit (the owner's own account, each reply sent after a confirmed click); Sign-in with Google or email and password; MCP clients over OAuth 2.1 or an API key.

**Security basics**
- API keys are stored hashed and can be revoked in Settings > API keys
- OAuth sign-in shows a consent screen; the key it creates expires after 90 days by default
- Every email carries the sender's postal address and a one-click unsubscribe link; anyone who unsubscribed, complained or bounced is never written to again

**How to start**: Under five minutes: add the MCP server to your assistant (growfast.sh/mcp), approve the consent screen, then tell the agent to scan your domain. Or paste a domain at growfast.sh with no account for a free scan.

**MCP server**: https://growfast.sh/api/mcp (registry name `sh.growfast/growfast`)

## Server addresses

- ChatGPT: https://growfast.sh/api/mcp/chatgpt (OAuth)
- Claude and Claude Code: https://growfast.sh/api/mcp/claude (OAuth)
- Full server: https://growfast.sh/api/mcp (OAuth or API key)

ChatGPT's menu names change; we have not re-checked these steps against the current ChatGPT interface. The server address and OAuth flow are what matter.

## Can an AI assistant send emails or post on Reddit through GrowFast?

Not through the ChatGPT and Claude connectors: the server refuses those calls for their keys. The Gemini CLI extension hides the sending tools on the client, but its key is full-scope (the consent screen says so), and so is any API key such as Cursor's; send_reply and set_autopilot send real email that cannot be recalled, so keep tool-call approval on.

## Tools

### ChatGPT and Claude connectors (research and drafting only)

| Tool | What it does |
| --- | --- |
| scan_domain | Read a product's website and return its ideal customer profile, a first cold email and the best-fit companies scored 1-10. |
| list_reddit_monitors | The Reddit monitors on the account, one per product. |
| set_reddit_monitor | Set what to listen for on Reddit for one product. |
| list_reddit_matches | Reddit posts found for a product, best first, with drafted replies. |
| draft_outreach_emails | For up to 10 companies find the named decision-maker on each company's own site and write a first email to them. |

### Added by the full server

| Tool | What it does |
| --- | --- |
| import_leads | Clean your own list (CSV text with an email column, optional company, name, website) into leads: drops invalid, duplicate, already-emailed, public-sector, role-mailbox (info@, support@) and no-mail-server addresses, and says why. |
| get_email_allowance | How many outreach emails are left this month on the plan. |
| export_outreach | Everyone this account has emailed, as CSV: email, company, contact, product, subject, delivery, replied, reply category. |
| list_sending_domains | The account's sending domains and managed GrowFast address, with remaining sends today. |
| list_autopilots | Every autopilot on the account (one per product) with its last result. |
| set_autopilot | Create or change the autopilot for one product and turn it on or off. |
| send_reply | Send the founder's answer to a prospect who replied, in the same thread, from the address they wrote to. |

## Prompt library

### Individual or side project

- Assign to GrowFast: scan mynewsletter.com and tell me which kinds of companies would pay for it, with the 5 best fits and why each scored what it did. Show me what you did so I can review it. (tools: scan_domain)
- Assign to GrowFast: listen on Reddit for people who need a tool like mynewsletter.com (keywords: newsletter tool, grow newsletter, find subscribers). Don't post anything; show me the matches with drafted replies and I will choose. (tools: set_reddit_monitor, list_reddit_matches)

### Small business

- Assign to GrowFast: scan mybakery-supplies.com, then draft first emails to the top 3 companies. Don't send anything. Show me each draft and the page the address was read from so I can approve. (tools: scan_domain, draft_outreach_emails)
- Assign to GrowFast: list my Reddit matches for mybakery-supplies.com, best first, and tell me which two are worth a reply. (tools: list_reddit_matches)

### Agency or sales team

- Assign to GrowFast: for clientsite.com scan the domain, then draft first emails to the 5 best-fit companies, addressed to the named decision-maker where the site names one. Summarise what you did and wait for my approval before anything else. (tools: scan_domain, draft_outreach_emails)
- Check how many outreach emails we have left this month and which sending domains are ready, then tell me whether we can approve a batch of 20 today. Do not send. (tools: get_email_allowance, list_sending_domains; full server)

### Developer

- List every GrowFast autopilot with its last result and tell me which ones are on. Change nothing. (tools: list_autopilots; full server)
- Clean this CSV with GrowFast (I confirm it is my own list of business contacts, not bought or scraped) and report how many rows were dropped and why. Don't send to anyone. (tools: import_leads; full server)

Install steps per client: https://growfast.sh/mcp