zkeviny Zero‑Exposure Slack Sender (MGC Secure Edition)
This skill sends messages to Slack channels without exposing webhook URLs or bot tokens.
All credentials are stored and retrieved securely from MGC Blackbox, ensuring zero plaintext secrets and zero accidental leaks.
🔧 Dependencies
Prerequisites
- MGC Blackbox installed and running
- Slack credentials stored in MGC
Start MGC:
mgc
MGC Service Information
| Item | Value |
|---|---|
| Port | 57219 |
| Token Path | ~/.mgc/database/mgc_black_box/.mgc_token |
| Start Command | mgc |
Slack Credentials JSON Format
{
"webhook_url": "https://hooks.slack.com/services/T.../B.../xxxx",
"bot_token": "xoxb-...",
"default_channel": "#general"
}
| Field | Required | Description |
|---|---|---|
| webhook_url | No* | Slack Incoming Webhook URL |
| bot_token | No* | Bot User OAuth Token |
| default_channel | No | Default channel name |
* At least one of webhook_url or bot_token must be provided.
🔐 Configuration
Store credentials in MGC:
mgc_save info_type=config info_owner=slack_bot < slack_config.json
info_typeandinfo_ownerare identifiers you define yourself, used to retrieve encrypted data from MGC.
✅ Supported Functionality
- Send text messages via Webhook
- Send text messages via Bot API
- Custom username
- Custom emoji icon
- Default channel support
❌ Not Supported
- Block Kit rich messages
- File uploads
- Thread replies
- Channel listing
🛠 MCP Tools
send_slack_message
Send a Slack message using credentials stored in MGC.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| text | string | Yes | Message text |
| channel | string | No | Target channel |
| username | string | No | Custom bot name |
| icon_emoji | string | No | Emoji icon (e.g., :robot:) |
| info_type | string | No | MGC info_type (default: config) |
| info_owner | string | No | MGC info_owner (default: slack_bot) |
Returns
{
"success": true,
"message": "Message sent"
}
💬 Trigger Phrases
- "send to slack"
- "slack message"
- "post to slack"
- "slack notification"
📘 Examples
Python (via MCP SDK)
from mcp import MCPClient
client = MCPClient("http://localhost:57219")
result = client.call_tool("send_slack_message", {
"text": "Deployment complete!",
"channel": "#deployments",
"username": "Deploy Bot",
"icon_emoji": ":rocket:"
})
print(result)
Direct Run
python example.py -t "Hello Slack"
python example.py -t "Hello" -c "#general"
🧪 Testing
Mock mode (no real Slack request):
python example.py -t "Test message" --mock
🛡 Security
- Credentials stored locally only in MGC
- No plaintext secrets in code
- No cloud upload
- Credentials retrieved securely at runtime
- No subprocess / exec / shell commands
👤 Author
MirginCipher
📄 License
MIT
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