diff --git a/AGENTS.md b/AGENTS.md
index 63ec28a5..80199061 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -14,6 +14,7 @@ Multiplayer arena game built with **Unity 6000.3.10f1** and **Unity Netcode for
 Design docs are maintained in Obsidian Vault: `\\Truenas\smb\Obsidian Vault\Colosseum`
 
 - Always use the shared Obsidian Vault at `\\Truenas\smb\Obsidian Vault\Colosseum` for project documentation updates.
+- **Obsidian Vault 파일은 반드시 파일 도구(read/write/edit)로만 접근한다.** cmd, powershell, bash 등은 UNC 경로를 정상적으로 처리하지 못하므로 사용하지 않는다.
 - Do not write Colosseum design notes to `C:\Users\dal4s\OneDrive\문서\Obsidian Vault\Colosseum`; that path is not the active vault for this project.
 - Unless the user explicitly names another file, `체크리스트` means `\\Truenas\smb\Obsidian Vault\Colosseum\개발\프로토타입 체크리스트.md`.
 - After completing work, always check whether the prototype checklist should be updated and reflect the new status when needed.