diff --git a/AGENTS.md b/AGENTS.md
index 95d9c93..845b87c 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -38,3 +38,12 @@ parameter calibration and test linking.
 - Isolate operational fixes (workflow/docs/dependency policy) from algorithmic
   edits.
 - Document assumptions and risk in commit/PR summaries.
+
+## Product design and Figma
+
+- This repo has no frontend, route tree, Figma file, or implemented visual
+  surface. Do not create UI code or visual artifacts unless a real product
+  surface is introduced.
+- Do not call future Figma work a "design system" unless it includes reusable
+  foundations, tokens, components, states, accessibility guidance, and code
+  mapping. Otherwise call it a UI kit, wireframe, or draft.