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diff --git a/AGENTS.md b/AGENTS.md
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--- a/AGENTS.md
+++ b/AGENTS.md
@@ -56,6 +56,14 @@
   count lines against the same string the cursor will erase.
   Prefer returning a fixed known count for the game's static layout and
   letting dynamic content fill it, rather than inferring the count.
+- The client refuses to start below 80x24 (`terminal_too_small`). Every game
+  board must fit in that size; a new board wider or taller than the minimum
+  must raise the minimum in the same change.
+
+## Schema
+- The app is in alpha: do not write schema migrations. `init_db` creates the
+  current shape; a schema change means deleting `server.db` and `client.db`.
+  Files written by an older build are not supported.
 
 ## Error Paths
 - When a game action fails after a balance deduction, the refund must happen