diff --git a/AGENTS.md b/AGENTS.md
deleted file mode 100644
index 4cec308..0000000
--- a/AGENTS.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# AGENTS.md
-
-This file provides guidance to Claude Code agents when working with code in this repository.
-
-**Note**: All detailed project information has been consolidated into [CLAUDE.md](./CLAUDE.md).
-
-Please refer to CLAUDE.md
diff --git a/README.md b/README.md
index d6c089b..10a1fd7 100644
--- a/README.md
+++ b/README.md
@@ -150,6 +150,10 @@ To add a custom preset (e.g., "premium"):
 > [!INFO]
 > - Changes require an opencode restart to take effect
 > - Custom mode presets can be added by editing the configuration file
+> - Built-in command files (`mode-performance.md`, `mode-economy.md`, etc.)
+>   are overwritten on every plugin startup. Do not modify them directly.
+> - Custom command files (e.g., `mode-premium.md`) are not affected by
+>   this overwrite and will persist across restarts.
 
 ## Development