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Slack MCP Tool - FREE (Webhook-based)
======================================
Send messages to Slack using incoming webhooks.
FREE - only requires creating a webhook URL in Slack settings.
No paid API access needed!
Setup:
1. Go to your Slack workspace
2. Create an app at https://api.slack.com/apps
3. Enable "Incoming Webhooks"
4. Create a webhook URL for your channel
5. Set SLACK_WEBHOOK_URL environment variable
This is the FREE tier approach - no Bot Token needed.
"""
import os
import json
import logging
from typing import Dict, List, Any, Optional
from dataclasses import dataclass
import requests
logger = logging.getLogger(__name__)
@dataclass
class SlackMessage:
"""A Slack message"""
text: str
blocks: Optional[List[Dict[str, Any]]] = None
attachments: Optional[List[Dict[str, Any]]] = None
class SlackWebhookMCP:
"""
Slack integration using FREE incoming webhooks.
No paid API subscription required - just create a webhook URL.
"""
def __init__(self, webhook_url: str = None):
self.webhook_url = webhook_url or os.getenv("SLACK_WEBHOOK_URL", "")
def is_configured(self) -> bool:
"""Check if Slack webhook is configured"""
return bool(self.webhook_url)
def send_message(
self,
text: str,
blocks: List[Dict[str, Any]] = None
) -> Dict[str, Any]:
"""
Send a message to Slack via webhook.
Args:
text: Plain text message (required as fallback)
blocks: Optional Block Kit blocks for rich formatting
Returns:
{"success": bool, "error": str if failed}
"""
if not self.is_configured():
logger.warning("Slack webhook not configured")
return {
"success": False,
"error": "SLACK_WEBHOOK_URL not set. Please configure it to use Slack integration."
}
payload = {"text": text}
if blocks:
payload["blocks"] = blocks
try:
response = requests.post(
self.webhook_url,
json=payload,
timeout=10
)
if response.status_code == 200:
logger.info(f"Slack message sent successfully")
return {"success": True}
else:
logger.error(f"Slack error: {response.status_code} - {response.text}")
return {"success": False, "error": response.text}
except Exception as e:
logger.error(f"Slack request error: {e}")
return {"success": False, "error": str(e)}
def send_alert(
self,
title: str,
message: str,
severity: str = "info",
details: Dict[str, Any] = None
) -> Dict[str, Any]:
"""
Send a formatted alert to Slack.
Args:
title: Alert title
message: Alert message
severity: "info", "warning", "error", "success"
details: Optional key-value details to include
"""
# Color based on severity
color_map = {
"info": "#2196F3",
"warning": "#FFC107",
"error": "#F44336",
"success": "#4CAF50"
}
color = color_map.get(severity, "#2196F3")
# Emoji based on severity
emoji_map = {
"info": "ℹ️",
"warning": "⚠️",
"error": "🚨",
"success": "✅"
}
emoji = emoji_map.get(severity, "ℹ️")
# Build blocks
blocks = [
{
"type": "header",
"text": {
"type": "plain_text",
"text": f"{emoji} {title}",
"emoji": True
}
},
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": message
}
}
]
# Add details if provided
if details:
fields = []
for key, value in list(details.items())[:10]: # Limit to 10 fields
fields.append({
"type": "mrkdwn",
"text": f"*{key}:* {value}"
})
blocks.append({
"type": "section",
"fields": fields
})
# Add divider
blocks.append({"type": "divider"})
return self.send_message(f"{emoji} {title}: {message}", blocks)
def send_insight(
self,
insight_title: str,
insight_text: str,
metric_name: str = None,
metric_value: str = None,
change_percent: float = None,
chart_url: str = None
) -> Dict[str, Any]:
"""
Send a business insight to Slack with rich formatting.
"""
blocks = [
{
"type": "header",
"text": {
"type": "plain_text",
"text": f"📊 DataVision Insight",
"emoji": True
}
},
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": f"*{insight_title}*\n\n{insight_text}"
}
}
]
# Add metric if provided
if metric_name and metric_value:
change_emoji = ""
if change_percent:
if change_percent > 0:
change_emoji = f"📈 +{change_percent:.1f}%"
else:
change_emoji = f"📉 {change_percent:.1f}%"
blocks.append({
"type": "section",
"fields": [
{
"type": "mrkdwn",
"text": f"*{metric_name}*\n{metric_value}"
},
{
"type": "mrkdwn",
"text": f"*Change*\n{change_emoji}" if change_emoji else ""
}
]
})
# Add chart if provided
if chart_url:
blocks.append({
"type": "image",
"image_url": chart_url,
"alt_text": insight_title
})
blocks.append({"type": "divider"})
return self.send_message(f"📊 {insight_title}", blocks)
def send_daily_summary(
self,
metrics: List[Dict[str, Any]],
highlights: List[str],
alerts: List[str] = None
) -> Dict[str, Any]:
"""
Send a daily business summary to Slack.
Args:
metrics: List of {"name": str, "value": str, "change": str}
highlights: List of key highlights
alerts: Optional list of alerts/warnings
"""
blocks = [
{
"type": "header",
"text": {
"type": "plain_text",
"text": "📈 Daily Business Summary",
"emoji": True
}
},
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "*Key Metrics*"
}
}
]
# Add metrics
for metric in metrics[:6]: # Limit to 6
blocks.append({
"type": "section",
"fields": [
{
"type": "mrkdwn",
"text": f"*{metric.get('name', '')}*"
},
{
"type": "mrkdwn",
"text": f"{metric.get('value', '')} ({metric.get('change', '')})"
}
]
})
# Add highlights
if highlights:
highlight_text = "\n".join([f"• {h}" for h in highlights[:5]])
blocks.append({
"type": "section",
"text": {
"type": "mrkdwn",
"text": f"*✨ Highlights*\n{highlight_text}"
}
})
# Add alerts
if alerts:
alert_text = "\n".join([f"• {a}" for a in alerts[:5]])
blocks.append({
"type": "section",
"text": {
"type": "mrkdwn",
"text": f"*⚠️ Alerts*\n{alert_text}"
}
})
blocks.append({"type": "divider"})
return self.send_message("📈 Daily Business Summary from DataVision", blocks)
# MCP Tool Interface
class SlackMCPTool:
"""
MCP-compatible interface for Slack.
"""
name = "slack"
description = "Send messages to Slack channels using webhooks (FREE)"
def __init__(self, webhook_url: str = None):
self.slack = SlackWebhookMCP(webhook_url)
async def execute(self, action: str, params: Dict[str, Any]) -> Dict[str, Any]:
"""
Execute a Slack action.
Actions:
- send: Send a simple message
- alert: Send an alert
- insight: Send a business insight
- summary: Send daily summary
"""
if not self.slack.is_configured():
return {
"success": False,
"error": "Slack not configured. Set SLACK_WEBHOOK_URL environment variable.",
"setup_help": "Go to https://api.slack.com/apps, create an app, enable Incoming Webhooks, and copy the URL."
}
try:
if action == "send":
return self.slack.send_message(
text=params.get("text", ""),
blocks=params.get("blocks")
)
elif action == "alert":
return self.slack.send_alert(
title=params.get("title", "Alert"),
message=params.get("message", ""),
severity=params.get("severity", "info"),
details=params.get("details")
)
elif action == "insight":
return self.slack.send_insight(
insight_title=params.get("title", ""),
insight_text=params.get("text", ""),
metric_name=params.get("metric_name"),
metric_value=params.get("metric_value"),
change_percent=params.get("change_percent")
)
elif action == "summary":
return self.slack.send_daily_summary(
metrics=params.get("metrics", []),
highlights=params.get("highlights", []),
alerts=params.get("alerts", [])
)
else:
return {"error": f"Unknown action: {action}"}
except Exception as e:
return {"error": str(e)}
# Convenience functions
def send_to_slack(message: str, webhook_url: str = None) -> bool:
"""Quick send to Slack"""
slack = SlackWebhookMCP(webhook_url)
result = slack.send_message(message)
return result.get("success", False)
def send_slack_alert(
title: str,
message: str,
severity: str = "info",
webhook_url: str = None
) -> bool:
"""Send an alert to Slack"""
slack = SlackWebhookMCP(webhook_url)
result = slack.send_alert(title, message, severity)
return result.get("success", False)
# Test
if __name__ == "__main__":
# Test (requires SLACK_WEBHOOK_URL to be set)
slack = SlackWebhookMCP()
if slack.is_configured():
# Test simple message
result = slack.send_message("🚀 DataVision test message!")
print(f"Simple message: {result}")
# Test alert
result = slack.send_alert(
title="Test Alert",
message="This is a test alert from DataVision",
severity="info",
details={"Source": "Test Script", "Time": "Now"}
)
print(f"Alert: {result}")
else:
print("Slack not configured. Set SLACK_WEBHOOK_URL to test.")
print("Note: This is FREE - just create an incoming webhook in Slack!")
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