AgentiSend — MCP server (stdio launcher)

AgentiSend is a transactional email API for AI agents and the products they run inside: verify a domain, create a key with a budget, send over REST or MCP, and read a log that says what happened to every message.

This package is the stdio launcher for clients that start a command and talk over pipes rather than speaking HTTP MCP. It is a proxy, not a second implementation: every tool, resource and prompt is forwarded to the hosted server at https://api.agentisend.com/mcp with your key, so what you get here is exactly what an HTTP client gets — the same catalogue, the same budgets, the same stops, and refusals with their fix field intact.

Install

npm install -g @agentisend/mcp-server

Most clients do not need that: npx -y @agentisend/mcp-server fetches it on first launch.

Related MCP server: AgentMail MCP Server

Add it to your MCP client

{
  "mcpServers": {
    "agentisend": {
      "command": "npx",
      "args": ["-y", "@agentisend/mcp-server"],
      "env": { "AGENTISEND_API_KEY": "your-key" }
    }
  }
}

--help prints the config above. --version prints the version. Both work without a key.

Send

Once connected, this is one turn:

Send a receipt to customer@example.com from receipts@yourdomain.com.

The agent calls send_email. preflight_email runs every gate a real send runs, sends nothing and costs nothing. Every 4xx returns code, message and fix. There is no tool for unsolicited mail.

Connecting over HTTP instead

Point any HTTP MCP client at https://api.agentisend.com/mcp. Auth is a bearer API key or OAuth 2.1 with dynamic client registration — no launcher, no install.

Links

• Docs: https://agentisend.com/docs · MCP guide: https://agentisend.com/docs/guides/mcp

• API contract: https://agentisend.com/openapi.json

• MCP endpoint: https://api.agentisend.com/mcp

• AGENTS.md — the short version, for an agent doing this without a person.

server.json is the Model Context Protocol registry manifest; its repository field points at the monorepo the registry entry was claimed from, and is left as the registry has it.

Problems: hello@agentisend.com. Licensed MIT.

This repository is generated from the AgentiSend monorepo; open an issue rather than a pull request.