From 284fee15cafa6b2c385b5e9bc7362df2932128d3 Mon Sep 17 00:00:00 2001
From: Viktor Barzin <viktorbarzin@meta.com>
Date: Sun, 22 Feb 2026 01:00:48 +0000
Subject: [PATCH] [ci skip] Fix Slack message formatting to use Block Kit
 mrkdwn

---
 .claude/cluster-health.sh | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/.claude/cluster-health.sh b/.claude/cluster-health.sh
index ea290e30..303f708e 100755
--- a/.claude/cluster-health.sh
+++ b/.claude/cluster-health.sh
@@ -371,12 +371,23 @@ if [[ "$SEND_SLACK" == true ]]; then
             fi
         fi
 
-        # Use python3 to JSON-escape the message body safely
-        json_payload=$(python3 -c "
+        # Use python3 to build Slack Block Kit payload with proper mrkdwn
+        json_payload=$(printf '%b' "$slack_text" | python3 -c "
 import json, sys
-text = sys.stdin.read()
-print(json.dumps({'text': text}))
-" <<< "$slack_text")
+text = sys.stdin.read().strip()
+payload = {
+    'blocks': [
+        {
+            'type': 'section',
+            'text': {
+                'type': 'mrkdwn',
+                'text': text
+            }
+        }
+    ]
+}
+print(json.dumps(payload))
+")
 
         curl -s -X POST "$SLACK_WEBHOOK_URL" \
             -H 'Content-Type: application/json' \