diff --git a/AGENTS.md b/AGENTS.md
index ddd3483..0587423 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -112,6 +112,11 @@ session with **no other memory of this project**. So:
     Retention, so gemini/anthropic/gpt-4o-mini are **not** routable) — keep
     `ALLOWED_MODELS` in the function in sync with `PROXY_MODELS` in
     `sasquatchBrain.ts`. Keyless **Pollinations** is the fallback.
+    **AI answers are Pro-only**: free users get the static FAQ/glossary + local
+    relay lookups only (`if (isPro)` gates the AI block in `SasquatchGuide`).
+    Pro access (`useSasquatchPro`) is granted by a provider-authored zap receipt,
+    and its **expiry is derived from the paid amount → tier**, never the
+    user-signed `pro-expiry` tag.
     `sasquatchBrain.ts` caps each request (15 s) and the whole attempt
     (35 s); the system prompt is a real `system` message; relay results are
     signature-verified (`verifyEvent`) before use. The first pass **streams**