diff --git a/AGENTS.md b/AGENTS.md
index 8bd0e39..40c2a82 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -3,3 +3,9 @@
 
 This version has breaking changes — APIs, conventions, and file structure may all differ from your training data. Read the relevant guide in `node_modules/next/dist/docs/` before writing any code. Heed deprecation notices.
 <!-- END:nextjs-agent-rules -->
+
+<!-- BEGIN:codex-workflow-rules -->
+# Codex workflow
+
+Before making repository changes, Codex should work from a dedicated branch in the Codex worktree. Prefer a `codex/...` branch name when Git refs allow it; if an existing ref blocks that namespace, use a `codex-...` branch name instead.
+<!-- END:codex-workflow-rules -->