Claude Code Notificaton to Slack Webhook

gistfile1.txt

#!/bin/bash

# Enhanced notify-slack.sh that handles both Notification and Stop hooks
# Replace YOUR_WEBHOOK_URL with your actual Slack webhook URL

# Slack Webhook URL (replace with your actual URL)
WEBHOOK_URL="YOUR/WEBHOOK/URL"

# Check if webhook URL has been updated
if [[ "$WEBHOOK_URL" == *"YOUR/WEBHOOK/URL"* ]]; then
    echo "Error: Please update WEBHOOK_URL with your actual Slack webhook URL" >&2
    exit 1
fi

# Claude Code sends JSON data via stdin, so we read it into a variable
INPUT=$(cat)

# Determine which hook triggered this script
# The Stop hook doesn't have 'message' or 'title' fields
if echo "$INPUT" | jq -e '.message' > /dev/null 2>&1; then
    # This is a Notification hook
    MESSAGE=$(echo "$INPUT" | jq -r '.message // "Claude Code notification"')
    TITLE=$(echo "$INPUT" | jq -r '.title // "Claude Code"')
    ICON="🔔"
    COLOR="warning"
else
    # This is likely a Stop hook
    SESSION_ID=$(echo "$INPUT" | jq -r '.session_id // "unknown"')
    TRANSCRIPT_PATH=$(echo "$INPUT" | jq -r '.transcript_path // "unknown"')
    STOP_HOOK_ACTIVE=$(echo "$INPUT" | jq -r '.stop_hook_active // false')

    # For Stop hook, create a custom message
    TITLE="Claude Code - Task Completed"
    MESSAGE="Task has been completed successfully"
    ICON="✅"
    COLOR="good"

    # If stop_hook_active is true, we might want to skip notification to avoid loops
    if [[ "$STOP_HOOK_ACTIVE" == "true" ]]; then
        echo "Skipping notification as stop_hook_active is true" >&2
        exit 0
    fi
fi

# Add timestamp
TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")

# Create Slack payload with different styling based on hook type
PAYLOAD=$(jq -n \
  --arg text "$ICON $TITLE" \
  --arg message "$MESSAGE" \
  --arg time "$TIMESTAMP" \
  --arg color "$COLOR" \
  '{
    "text": $text,
    "attachments": [{
      "color": $color,
      "fields": [
        {
          "title": "Message",
          "value": $message,
          "short": false
        },
        {
          "title": "Time",
          "value": $time,
          "short": true
        }
      ]
    }]
  }')

# Send to Slack
curl -X POST \
  -H "Content-Type: application/json" \
  -d "$PAYLOAD" \
  "$WEBHOOK_URL" \
  -s -w "\nNotification sent to Slack: HTTP %{http_code}\n"