FieldCure.Mcp.Outbox 2.1.2

.NET 8.0

{
  "servers": {
    "FieldCure.Mcp.Outbox": {
      "type": "stdio",
      "command": "dnx",
      "args": ["FieldCure.Mcp.Outbox@2.1.2", "--yes"]
    }
  }
}

This package contains an MCP Server. The server can be used in VS Code by copying the generated JSON to your VS Code workspace's .vscode/mcp.json settings file.

dotnet tool install --global FieldCure.Mcp.Outbox --version 2.1.2

This package contains a .NET tool you can call from the shell/command line.

dotnet new tool-manifest
                    

                            if you are setting up this repo

dotnet tool install --local FieldCure.Mcp.Outbox --version 2.1.2

This package contains a .NET tool you can call from the shell/command line.

#tool dotnet:?package=FieldCure.Mcp.Outbox&version=2.1.2

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

nuke :add-package FieldCure.Mcp.Outbox --version 2.1.2

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

FieldCure.Mcp.Outbox

Multi-channel messaging MCP server — send messages through Slack, Telegram, Email (Gmail, Naver, Microsoft Graph API), KakaoTalk, and Discord with a single send_message tool. One install, one interface, multiple channels.

Install

dotnet tool install -g FieldCure.Mcp.Outbox

Quick Start

# Add a Slack channel
fieldcure-mcp-outbox add slack

# Add a Gmail channel
fieldcure-mcp-outbox add gmail

# Start MCP server
fieldcure-mcp-outbox

Claude Desktop

{
  "mcpServers": {
    "outbox": {
      "command": "fieldcure-mcp-outbox"
    }
  }
}

Tools (4)

Tool	Description	Confirmation
`list_channels`	List all configured messaging channels	—
`add_channel`	Add a new channel (opens setup console)	—
`send_message`	Send a message through a channel	Required
`remove_channel`	Remove a channel and its data	Required

Channels

Channel	Protocol	Setup
Slack	Web API (`chat.postMessage`)	Bot Token
Telegram	Client API (WTelegramClient)	API ID + Hash + SMS
Gmail	SMTP (smtp.gmail.com:587)	App password
Naver	SMTP (smtp.naver.com:465)	App password
Microsoft	Graph API (`/me/sendMail`)	OAuth 2.0
Custom SMTP	User-defined SMTP server	Username + password
KakaoTalk	Kakao REST API	OAuth 2.0
Discord	Webhook API	Webhook URL

Credential Storage

Credentials are resolved in this order:

In-memory cache (from prior elicitation or env var pickup in the current session)
Environment variable OUTBOX_{CHANNEL_ID}_{FIELD} (e.g. OUTBOX_SLACK_GENERAL_BOT_TOKEN)
channels.json (plaintext, written by the CLI setup flow)
MCP Elicitation (when the client supports it)

OAuth dynamic tokens (Microsoft, KakaoTalk) are persisted separately in tokens.json with current-user-only file permissions (Windows ACL / Unix 0600). Channel setup never passes credentials through MCP stdio.

Plaintext storage in channels.json is a deliberate local-trust choice — same same-user security boundary as ~/.docker/config.json and ~/.config/gh/hosts.yml. For shared hosts, CI, or headless deployments, set the env vars directly and leave the secret fields of channels.json empty. See ADR-001 Principle 2.

Requirements

.NET 8.0 Runtime or later

Version	Downloads	Last Updated
2.1.2	106	4/23/2026
2.1.1	115	4/21/2026
2.1.0	102	4/20/2026
2.0.0	111	4/17/2026
1.1.0	100	4/14/2026
1.0.0	111	4/7/2026
0.4.1	119	4/3/2026
0.4.0	105	3/31/2026
0.3.0	100	3/31/2026
0.2.0	115	3/30/2026
0.1.0	110	3/29/2026