add

AGENTS.md

@@ -299,9 +299,20 @@ AGENT_WORKFLOW.md
 CLAUDE.md  
 AGENTS.md  
 
-This allows it to be used by:
-
-- Claude Code Agent Teams
-- Codex CLI
-- Gemini Code Assist
-- Cursor Agents
+This allows it to be used by:
+
+- Claude Code Agent Teams
+- Codex CLI
+- Gemini Code Assist
+- Cursor Agents
+
+---
+
+# gstack
+
+This repo also uses the global `gstack` skill pack for AI-assisted work.
+
+- Claude Code: install to `~/.claude/skills/gstack` and run `./setup --team`
+- Codex: gstack skills are installed globally under `~/.codex/skills/gstack-*`
+- Prefer gstack skills for structured work when they fit the task, especially `/browse`, `/review`, `/investigate`, `/qa`, `/ship`, and `/cso`
+- Do not reference vendored repo paths for gstack; use the global install path instead