diff --git a/bin/doctor.sh b/bin/doctor.sh
index c00882d..f9b3338 100755
--- a/bin/doctor.sh
+++ b/bin/doctor.sh
@@ -232,6 +232,52 @@ else
   fi
 fi
 
+# ── Runtime Health ────────────────────────────────────────────────────────────
+
+echo ""
+echo "Runtime health:"
+
+# Slack bridge
+if curl -s -o /dev/null -w '%{http_code}' -X POST http://127.0.0.1:7890/send -H 'Content-Type: application/json' -d '{}' 2>/dev/null | grep -q "400"; then
+  pass "slack bridge responding (port 7890)"
+else
+  warn "slack bridge not responding on port 7890"
+fi
+
+# Disk usage
+DISK_PCT=$(df / 2>/dev/null | tail -1 | awk '{print $5}' | tr -d '%')
+if [ -n "$DISK_PCT" ]; then
+  if [ "$DISK_PCT" -ge 90 ]; then
+    fail "disk usage at ${DISK_PCT}% (critical)"
+  elif [ "$DISK_PCT" -ge 80 ]; then
+    warn "disk usage at ${DISK_PCT}%"
+  else
+    pass "disk usage at ${DISK_PCT}%"
+  fi
+fi
+
+# Stale session sockets
+SOCKET_DIR="$BAUDBOT_HOME/.pi/session-control"
+if [ -d "$SOCKET_DIR" ]; then
+  STALE_SOCKS=0
+  if command -v fuser &>/dev/null; then
+    for sock in "$SOCKET_DIR"/*.sock; do
+      [ -e "$sock" ] || continue
+      if ! fuser "$sock" &>/dev/null 2>&1; then
+        STALE_SOCKS=$((STALE_SOCKS + 1))
+      fi
+    done
+    if [ "$STALE_SOCKS" -gt 0 ]; then
+      warn "$STALE_SOCKS stale session socket(s) in $SOCKET_DIR"
+    else
+      pass "no stale session sockets"
+    fi
+  else
+    warn "fuser not installed; skipping stale socket check"
+  fi
+fi
+
+
 # ── Summary ──────────────────────────────────────────────────────────────────
 
 echo ""