diff --git a/docker/agents/Dockerfile b/docker/agents/Dockerfile
index f58af00..e27afc5 100644
--- a/docker/agents/Dockerfile
+++ b/docker/agents/Dockerfile
@@ -1,7 +1,7 @@
 FROM debian:bookworm-slim
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    bash curl git jq tmux cron python3 python3-pip openssh-client ca-certificates age shellcheck \
+    bash curl git jq tmux cron python3 python3-pip openssh-client ca-certificates age shellcheck procps \
     && pip3 install --break-system-packages networkx \
     && rm -rf /var/lib/apt/lists/*
 
diff --git a/lib/formula-session.sh b/lib/formula-session.sh
index e6c6aae..b23c62d 100644
--- a/lib/formula-session.sh
+++ b/lib/formula-session.sh
@@ -44,6 +44,11 @@ acquire_cron_lock() {
 # Exits 0 (skip) if available memory is below MIN_MB (default 2000).
 check_memory() {
   local min_mb="${1:-2000}"
+  # Graceful fallback if free command is not available (procps not installed)
+  if ! command -v free &>/dev/null; then
+    log "run: free not found, skipping memory check"
+    return 0
+  fi
   local avail_mb
   avail_mb=$(free -m | awk '/Mem:/{print $7}')
   if [ "${avail_mb:-0}" -lt "$min_mb" ]; then