diff --git a/scripts/install-golem15.sh b/scripts/install-golem15.sh
index 41ad07f82..c1d501d30 100755
--- a/scripts/install-golem15.sh
+++ b/scripts/install-golem15.sh
@@ -4,7 +4,7 @@ set -euo pipefail
 usage() {
   cat <<'EOF'
 Install the private golem15 GSD build for Claude Code and Codex.
-Grok Build consumes the Claude installation through its compatibility layer.
+Grok Build consumes the shared Codex skills or Claude compatibility surface.
 
 Usage:
   scripts/install-golem15.sh [--update] [--skip-deps] [--profile PROFILE]
@@ -89,6 +89,7 @@ node bin/install.js --codex --global "--profile=$profile"
 
 claude_root=${CLAUDE_CONFIG_DIR:-"$HOME/.claude"}
 codex_root=${CODEX_HOME:-"$HOME/.codex"}
+agents_root=${GROK_AGENTS_HOME:-"$HOME/.agents"}
 recovery_rel=gsd-core/workflows/plan-phase/steps/agent-recovery-and-timing.md
 
 for install_root in "$claude_root" "$codex_root"; do
@@ -113,11 +114,13 @@ fi
 if command -v grok >/dev/null 2>&1; then
   grok_report=$(mktemp)
   trap 'rm -f "$grok_report"' EXIT
+  shared_skill="$agents_root/skills/gsd-plan-phase/SKILL.md"
+  claude_skill="$claude_root/skills/gsd-plan-phase/SKILL.md"
   if grok inspect --json >"$grok_report" 2>/dev/null \
-    && grep -Fq "$claude_root/skills/gsd-plan-phase/SKILL.md" "$grok_report"; then
-    echo "==> Grok verified: Claude-compatible gsd-plan-phase skill discovered"
+    && { grep -Fq "$shared_skill" "$grok_report" || grep -Fq "$claude_skill" "$grok_report"; }; then
+    echo "==> Grok verified: gsd-plan-phase skill discovered"
   else
-    echo "WARNING: Grok did not report the Claude gsd-plan-phase skill; restart Grok and run 'grok inspect'." >&2
+    echo "WARNING: Grok did not report a compatible gsd-plan-phase skill; restart Grok and run 'grok inspect'." >&2
   fi
 fi
 
@@ -127,6 +130,7 @@ Private GSD installation complete.
   Source:  $repo_root
   Claude:  $claude_root
   Codex:   $codex_root
+  Grok:    $agents_root/skills (shared Codex surface, with Claude compatibility fallback)
   Profile: $profile
 
 Restart Claude Code, Codex, and Grok Build before using the updated skills.