diff --git a/web-ui/code.js b/web-ui/code.js
index b089823..a643ea3 100644
--- a/web-ui/code.js
+++ b/web-ui/code.js
@@ -2880,8 +2880,11 @@ function _buildCodeSystemPrompt() {
   const _activeCode = (() => { try { const f = codeFiles.find(f => f.id === activeCodeFileId); return f?.model?.getValue() || f?.content || ''; } catch { return ''; } })();
   const boardHints = _boardSpecificHints(_activeCode);
   const isLangOnly = _csbSelBoard?.fqbn?.startsWith('lang:');
+  const libBlock = (!isLangOnly && _csbBoardLibs.length)
+    ? `\n설치된 라이브러리: ${_csbBoardLibs.join(', ')}`
+    : '';
   const boardBlock = _csbSelBoard?.fqbn
-    ? `\n## ${isLangOnly ? '코딩 언어' : '대상 보드'}: ${_csbSelBoard.name}${isLangOnly ? '' : ` (${_csbSelBoard.fqbn})`}${boardHints}\n`
+    ? `\n## ${isLangOnly ? '코딩 언어' : '대상 보드'}: ${_csbSelBoard.name}${isLangOnly ? '' : ` (${_csbSelBoard.fqbn})`}${boardHints}${libBlock}\n`
     : '';
 
   // 에디터 파일 컨텍스트 — 로컬 폴더와 분리하여 강조
@@ -4803,10 +4806,26 @@ let _csbSelBoard = (() => {
   catch { return CSB_BOARD_DEFAULT; }
 })();
 let _csbSelAllBoards = [];
+let _csbBoardLibs = [];      // 현재 보드의 설치된 라이브러리 캐시
+let _csbBoardLibsFqbn = '';  // 캐시된 fqbn
+
+async function _csbFetchLibs(fqbn) {
+  if (!fqbn || fqbn.startsWith('lang:')) { _csbBoardLibs = []; _csbBoardLibsFqbn = fqbn; return; }
+  if (fqbn === _csbBoardLibsFqbn) return;
+  try {
+    const data = await api('/api/arduino/libs?fqbn=' + encodeURIComponent(fqbn));
+    _csbBoardLibs = (data.libs || []).map(l => l.name).filter(Boolean);
+    _csbBoardLibsFqbn = fqbn;
+  } catch { _csbBoardLibs = []; }
+}
+
+// 초기 로드 시 현재 보드 라이브러리 가져오기
+_csbFetchLibs(_csbSelBoard.fqbn);
 
 function _csbBoardSelSave(board) {
   _csbSelBoard = board;
   try { localStorage.setItem('csb_selected_board', JSON.stringify(board)); } catch {}
+  _csbFetchLibs(board.fqbn);
   const el = document.getElementById('csb-board-sel-name');
   if (el) el.textContent = board.name;
   const badge = document.getElementById('csb-board-qemu-badge');