diff --git a/AGENTS.md b/AGENTS.md
index 67d97667cf..320b71dc04 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -718,3 +718,13 @@ The dashboard is reachable at the operator's chosen URL/port (default `http://lo
 - **Local VPS / shared dev environments**: ask the operator for the URL and current credentials — they live in their personal vault, NOT in this repo.
 
 > Any credential observed in a previous version of this file was a non-production demo value; treat it as compromised and do not reuse it.
+
+<!-- BEGIN:nextjs-agent-rules -->
+
+# This is NOT the Next.js you know
+
+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/` (resolved from this file's directory; in monorepos the `next` package may not be visible from the repo root) before writing any code. Heed deprecation notices.
+
+This block is written and re-added by `next dev` — verify at `node_modules/next/dist/server/lib/generate-agent-files.js`. Removing it from a diff only re-creates the uncommitted change; committing it with your work keeps the tree clean.
+
+<!-- END:nextjs-agent-rules -->