diff --git a/AGENTS.md b/AGENTS.md
index d1f8d38..774f35c 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -8,3 +8,5 @@ Codex uses `AGENTS.md` as the repo entry point.
 
 - `src/ml4t/live/AGENTS.md` provides the package-level module index
 - Public entry point: `from ml4t.live import LiveEngine`
+- `docs/book-guide/index.md` provides the chapter-to-API cross-reference (book notebook -> concept
+  -> `ml4t.live` API -> docs page)