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Home/Servers/Mailbuttons (mbag.ai)

Mailbuttons (mbag.ai)

by com.mailbuttons

Governed email for AI agents (Mailbuttons / mbag.ai): sandbox inboxes, policy gate, audit log.

Power your agent

Add this server

The publisher's own URL. Not a PlugMCP endpoint.

Server URL
https://mailbuttons.com/api/v1/mcp/rpc
Credentials from the publisher
  • MAILBUTTONS_API_KEY — A scoped Mailbuttons MCP token (mb_sandbox_...). Sandbox-by-default; external send requires human promotion.
  • MAILBUTTONS_API_URL — Backend base URL. Defaults to https://mailbuttons.com; set for self-hosted or local.
Provider
Add in Claude

Claude opens with the name and URL filled in. You still confirm it there.

Claude Code
claude mcp add --transport http com.mailbuttons-mcp-server https://mailbuttons.com/api/v1/mcp/rpc

Run in a terminal.

Claude Desktop
{
  "mcpServers": {
    "com.mailbuttons-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://mailbuttons.com/api/v1/mcp/rpc"
      ]
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

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Governed email for AI agents (Mailbuttons / mbag.ai): sandbox inboxes, policy gate, audit log.

Mailbuttons MCP server

Governed email for AI agents, over the Model Context Protocol. Give an agent a scoped mailbox where the server enforces the guardrails, not the prompt: sandbox-by-default inboxes, a policy gate on every send, and a tamper-evident audit log. External sending and scope changes are human-approved, never granted by the agent itself.

  • Registry: com.mailbuttons/mcp-server
  • npm: @mailbuttons/mcp-server
  • Platform: mailbuttons.com · agent front door: mbag.ai

Use it

Hosted (recommended) — a streamable-HTTP endpoint served by the platform:

https://mailbuttons.com/api/v1/mcp/rpc
Authorization: Bearer <your Mailbuttons MCP token>   # mb_sandbox_... (or mb_prod_...)

Local (stdio) — run the npm package and let your agent launch it:

{
  "mcpServers": {
    "mailbuttons": {
      "command": "npx",
      "args": ["-y", "@mailbuttons/mcp-server"],
      "env": { "MAILBUTTONS_API_KEY": "mb_sandbox_..." }
    }
  }
}

Get a scoped token from the dashboard or POST /api/v1/mcp/sandbox-inboxes. Sandbox tokens can never send externally until a human promotes them.

What the server enforces

  • Inbound — a per-mailbox sender policy, fail-closed: mail from strangers bounces by default, so nobody can prompt-inject your agent just by emailing it.
  • Outbound — a recipient blocklist the agent can read but not change; a blocked send returns a normal {"status":"blocked"} result, not an error.
  • Caps + audit — per-account send caps and a hash-chained audit log that records refusals too.
  • Escalation — sending externally or widening scope is propose-only; a named human approves. The agent cannot approve its own request.

Install as an agent skill

This repo ships a root SKILL.md, so any skills-aware agent can add it:

npx skills add mailbuttons/mcp-server

Docs

  • Agent signup (for agents): https://mbag.ai/docs/agent-signup.md
  • Trust model: https://mbag.ai/docs/trust-model.md
  • OpenAPI: https://mbag.ai/api/openapi.json
  • Framework recipes: references/ (Claude Agent SDK, LangChain, plain SDK)

Mailbuttons is a trading name of Code Cutter Limited (UK, no. 08453060). MIT licensed.

How do I install Mailbuttons (mbag.ai)?
Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Mailbuttons (mbag.ai) need an API key?
The publisher lists these environment variables: MAILBUTTONS_API_KEY, MAILBUTTONS_API_URL.
What transport does Mailbuttons (mbag.ai) use?
Mailbuttons (mbag.ai) is reached over HTTP.
When was Mailbuttons (mbag.ai) last checked?
Last checked 2026-10-16. Governed email for AI agents (Mailbuttons / mbag.ai): sandbox inboxes, policy gate, audit log.

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