diff --git a/.agents/skills/multi-agent-mux-resume/scripts/resolve_session_id.sh b/.agents/skills/multi-agent-mux-resume/scripts/resolve_session_id.sh
index c17dc62..e7d5808 100755
--- a/.agents/skills/multi-agent-mux-resume/scripts/resolve_session_id.sh
+++ b/.agents/skills/multi-agent-mux-resume/scripts/resolve_session_id.sh
@@ -36,8 +36,8 @@ done
 [ -n "$WORKSPACE" ] || { echo "ERROR: --workspace required" >&2; exit 2; }
 [ -n "$AGENT" ]    || { echo "ERROR: --agent required" >&2; exit 2; }
 case "$AGENT" in
-  claude|agy|hermes|cline) ;;
-  *) echo "ERROR: --agent must be claude or agy or hermes or cline" >&2; exit 2 ;;
+  claude|agy|hermes|cline|grok) ;;
+  *) echo "ERROR: --agent must be claude, agy, hermes, cline, or grok" >&2; exit 2 ;;
 esac
 
 find_workspace_uuid "$WORKSPACE" "$AGENT" "$SESSION_NAME"
diff --git a/.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh b/.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh
index ba20c51..0a6b506 100755
--- a/.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh
+++ b/.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh
@@ -42,7 +42,7 @@ done
 [ -n "$WORKSPACE" ] || { echo "ERROR: --workspace required" >&2; exit 2; }
 [ -n "$AGENT" ]    || { echo "ERROR: --agent required" >&2; exit 2; }
 case "$AGENT" in
-  claude|agy|hermes|cline) ;;
+  claude|agy|hermes|cline|grok) ;;
   *) echo "ERROR: unsupported agent: $AGENT" >&2; exit 2 ;;
 esac
 [ -n "$SESSION_NAME" ] || { echo "ERROR: --session required" >&2; exit 2; }