diff --git a/_board/_BOARD.md b/_board/_BOARD.md
index daea495..fd2382b 100644
--- a/_board/_BOARD.md
+++ b/_board/_BOARD.md
@@ -139,8 +139,10 @@
 
 ## In Progress
 
+## Done
+
 ### S1-01 Implement Shell Tool Core
-  - tags: [in-progress]
+  - tags: [done]
   - defaultExpanded: false
     ```md
     Implement the core shell tool that executes shell commands in a sandboxed environment with structured response format.
@@ -148,8 +150,6 @@
     Source: S1-01_SHELL_TOOL_CORE.md
     ```
 
-## Done
-
 ### P12-14 Manual End-to-End Testing
   - tags: [done]
   - defaultExpanded: false