diff --git a/nix/packages/hive-forge-tools.nix b/nix/packages/hive-forge-tools.nix
index 2b2cbda..188b279 100644
--- a/nix/packages/hive-forge-tools.nix
+++ b/nix/packages/hive-forge-tools.nix
@@ -148,6 +148,9 @@ pkgs.writeShellApplication {
       else
         _body="$*"
       fi
+      if [ -z "$(printf '%s' "$_body" | tr -d '[:space:]')" ]; then
+        echo "hive-forge comment: refusing to post empty comment body" >&2; exit 1
+      fi
       local _payload
       _payload=$(jq -n --arg body "$_body" '{body:$body}')
       forge_post "$FORGE_API/repos/$_repo/issues/$_n/comments" "$_payload" \
@@ -174,6 +177,9 @@ pkgs.writeShellApplication {
         _body="$1"; shift
         if [ $# -gt 0 ]; then _repo="$1"; fi
       fi
+      if [ -z "$(printf '%s' "$_body" | tr -d '[:space:]')" ]; then
+        echo "hive-forge comment-edit: refusing to post empty comment body" >&2; exit 1
+      fi
       local _payload
       _payload=$(jq -n --arg body "$_body" '{body:$body}')
       forge_patch "$FORGE_API/repos/$_repo/issues/comments/$_id" "$_payload" \