AgentiSend for applications and AI agents

AgentiSend is a Resend alternative: a transactional email API for apps (password resets, receipts, sign-in codes) that takes Resend SDK requests unchanged, with per-key budgets and a kill switch for AI agents that send. Send receipts, password resets, sign-in codes and alerts from your own verified domain, with a message log and a free preflight. The hosted MCP server at https://api.agentisend.com/mcp exposes 92 tools (46 on tools/list; the rest via list_more_tools) for sending, domain setup, templates, contacts, broadcasts, webhooks and delivery logs. In Claude, the message log, each agent key with its budget, domain DNS setup and preflight results open as interactive views. A send is one message or a batch of up to 500 items with per-item results. preflight_email runs every gate a real send runs, sends nothing, and costs nothing. Every refusal returns a code, a message and the fix. A loop guard holds repeated sends for a person. You can cap what each agent spends, and stop all sending with a kill switch. There is no tool for unsolicited mail. Sign in with OAuth 2.1 and dynamic client registration, or use an API key. Starter prompts: "Send this receipt to the customer." "Preflight this send and tell me what would stop it." "What can I spend today?"

This repository ships the skill (SKILL.md) and the plugin manifests for Claude Code, Cursor and Grok Build. The MCP server itself is hosted at https://api.agentisend.com/mcp.

Install

Claude Code — the plugin brings the server and the skill together:

/plugin marketplace add fortuneflick/agentisend-claude-plugin
/plugin install agentisend@agentisend

Every line below carries the same endpoint (https://api.agentisend.com/mcp) and a placeholder key — replace as_YOUR_API_KEY_HERE with a key from the console.

Cursor

cursor://anysphere.cursor-deeplink/mcp/install?name=agentisend&config=eyJ1cmwiOiJodHRwczovL2FwaS5hZ2VudGlzZW5kLmNvbS9tY3AiLCJoZWFkZXJzIjp7IkF1dGhvcml6YXRpb24iOiJCZWFyZXIgYXNfWU9VUl9BUElfS0VZX0hFUkUifX0=

Open this link and Cursor offers to add the server. Replace the placeholder key in Settings → MCP afterwards, or paste the same object into .cursor/mcp.json.

Claude Code

claude mcp add --transport http agentisend https://api.agentisend.com/mcp \
  --header "Authorization: Bearer as_YOUR_API_KEY_HERE"

Or install the plugin, which brings the server and the sending skill together: /plugin marketplace add fortuneflick/agentisend-claude-plugin then /plugin install agentisend@agentisend.

Codex CLI

codex mcp add agentisend --url https://api.agentisend.com/mcp \
  --bearer-token-env-var AGENTISEND_API_KEY

The token stays in your environment; Codex writes only the variable name to ~/.codex/config.toml.

Gemini CLI

gemini mcp add --transport http \
  --header "Authorization: Bearer as_YOUR_API_KEY_HERE" \
  agentisend https://api.agentisend.com/mcp

Check it with gemini mcp list.

VS Code

code --add-mcp '{"name":"agentisend","type":"http","url":"https://api.agentisend.com/mcp","headers":{"Authorization":"Bearer as_YOUR_API_KEY_HERE"}}'

Or write the same server into .vscode/mcp.json under servers.

Windsurf

{
  "mcpServers": {
    "agentisend": {
      "serverUrl": "https://api.agentisend.com/mcp",
      "headers": {
        "Authorization": "Bearer as_YOUR_API_KEY_HERE"
      }
    }
  }
}

Goes in ~/.codeium/windsurf/mcp_config.json, then refresh the MCP panel.

OpenCode

{
  "mcp": {
    "agentisend": {
      "type": "remote",
      "url": "https://api.agentisend.com/mcp",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer {env:AGENTISEND_API_KEY}"
      }
    }
  }
}

Goes in opencode.json; the key is read from your environment rather than written to the file.

... View full README on GitHub