diff --git a/.agent/rules/documents.md b/.agent/rules/documents.md
index 62571f4..36b75d7 100644
--- a/.agent/rules/documents.md
+++ b/.agent/rules/documents.md
@@ -5,3 +5,5 @@
 ---
 
 1. 詳細な設計がdocumentsにあるので、改造を計画する際に参照すること。
+2. ソースコードの編集が完了したら、`tools/count_loc.cjs` と `tools/nesting_depth.cjs` を使用して計測を行うこと。
+3. 計測の結果、ソースコードが600行以上、またはネストが7階層以上のコードについては、リファクタリングを検討すること。
diff --git a/tools/count_loc.cjs b/tools/count_loc.cjs
new file mode 100644
index 0000000..987c09e
--- /dev/null
+++ b/tools/count_loc.cjs
@@ -0,0 +1,44 @@
+const fs = require('fs');
+const path = require('path');
+
+function countLines(filePath) {
+    try {
+        const content = fs.readFileSync(filePath, 'utf8');
+        return content.split('\n').length;
+    } catch (e) {
+        return 0;
+    }
+}
+
+function walk(dir, results = []) {
+    const list = fs.readdirSync(dir);
+    list.forEach(file => {
+        const fullPath = path.join(dir, file);
+        const stat = fs.statSync(fullPath);
+        if (stat.isDirectory()) {
+            if (!['node_modules', 'target', 'dist', '.git', '.gemini', '.brain'].includes(file) && !file.startsWith('.')) {
+                walk(fullPath, results);
+            }
+        } else {
+            const ext = path.extname(fullPath);
+            if (['.rs', '.js', '.ts', '.html', '.css'].includes(ext)) {
+                results.push({
+                    path: path.relative(process.cwd(), fullPath),
+                    loc: countLines(fullPath)
+                });
+            }
+        }
+    });
+    return results;
+}
+
+const srcDir = process.cwd();
+const files = walk(srcDir);
+files.sort((a, b) => b.loc - a.loc);
+
+console.log('--- Source Code Line Counts ---');
+files.forEach(f => {
+    if (f.loc === 0) return;
+    const status = f.loc >= 600 ? '[REFACTOR REQUIRED]' : ' ';
+    console.log(`${f.path.padEnd(60)} : ${f.loc.toString().padStart(5)} lines ${status}`);
+});
diff --git a/tools/nesting_depth.cjs b/tools/nesting_depth.cjs
new file mode 100644
index 0000000..3122026
--- /dev/null
+++ b/tools/nesting_depth.cjs
@@ -0,0 +1,55 @@
+const fs = require('fs');
+const path = require('path');
+
+function getMaxNesting(filePath) {
+    try {
+        const content = fs.readFileSync(filePath, 'utf8');
+        let maxDepth = 0;
+        let currentDepth = 0;
+
+        for (let i = 0; i < content.length; i++) {
+            const char = content[i];
+            if (char === '{') {
+                currentDepth++;
+                if (currentDepth > maxDepth) maxDepth = currentDepth;
+            } else if (char === '}') {
+                currentDepth--;
+            }
+        }
+        return maxDepth;
+    } catch (e) {
+        return 0;
+    }
+}
+
+function walk(dir, results = []) {
+    const list = fs.readdirSync(dir);
+    list.forEach(file => {
+        const fullPath = path.join(dir, file);
+        const stat = fs.statSync(fullPath);
+        if (stat.isDirectory()) {
+            if (!['node_modules', 'target', 'dist', '.git', '.gemini', '.brain'].includes(file) && !file.startsWith('.')) {
+                walk(fullPath, results);
+            }
+        } else {
+            const ext = path.extname(fullPath);
+            if (['.rs', '.js', '.ts', '.html', '.css'].includes(ext)) {
+                results.push({
+                    path: path.relative(process.cwd(), fullPath),
+                    depth: getMaxNesting(fullPath)
+                });
+            }
+        }
+    });
+    return results;
+}
+
+const srcDir = process.cwd();
+const files = walk(srcDir);
+files.sort((a, b) => b.depth - a.depth);
+
+console.log('--- Source Code Nesting Depth ---');
+files.forEach(f => {
+    const status = f.depth >= 7 ? '[REFACTOR REQUIRED]' : ' ';
+    console.log(`${f.path.padEnd(60)} : ${f.depth.toString().padStart(5)} levels ${status}`);
+});