diff --git a/.github/workflows/brain-l1-watcher-weekly.yml b/.github/workflows/brain-l1-watcher-weekly.yml
new file mode 100644
index 00000000..d3c934ca
--- /dev/null
+++ b/.github/workflows/brain-l1-watcher-weekly.yml
@@ -0,0 +1,31 @@
+name: brain-l1-watcher (weekly)
+
+on:
+  schedule:
+    - cron: '0 6 * * 1'
+  workflow_dispatch:
+
+jobs:
+  drift:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - name: run l1-watcher
+        id: l1
+        run: node tools/l1-watcher.mjs
+        continue-on-error: true
+      - name: open issue on drift
+        if: steps.l1.outcome == 'failure'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: `[l1-watcher] drift detected (weekly cron ${new Date().toISOString().slice(0,10)})`,
+              body: `Run failed. Check workflow logs and run /claude-md-management:claude-md-improver.`,
+              labels: ['brain', 'drift']
+            });
diff --git a/app/vitest.config.tools.mjs b/app/vitest.config.tools.mjs
index 796ba059..6d9701fd 100644
--- a/app/vitest.config.tools.mjs
+++ b/app/vitest.config.tools.mjs
@@ -7,6 +7,7 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'node',
-    include: ['../tools/observer-pii-filter.test.mjs'],
+    include: ['../tools/*.test.mjs'],
+    exclude: ['../tools/ruflo-*.test.mjs', '../tools/subagent-prompt-prefix.test.mjs'],
   },
 });
diff --git a/tools/l1-watcher.mjs b/tools/l1-watcher.mjs
new file mode 100644
index 00000000..67ca8a6b
--- /dev/null
+++ b/tools/l1-watcher.mjs
@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+import { readFileSync, existsSync } from 'fs';
+import { join } from 'path';
+import { homedir } from 'os';
+
+const PLUGIN_NAME_PATTERN = /[a-z][\w-]*(?:@[\w-]+)?/g;
+
+export function detectDrift(settings, toolingText) {
+  const enabled = Object.entries(settings.enabledPlugins || {})
+    .filter(([, v]) => v === true)
+    .map(([k]) => k);
+  const found = new Set();
+  for (const m of toolingText.matchAll(PLUGIN_NAME_PATTERN)) found.add(m[0]);
+  const missingInTooling = enabled.filter((p) => !found.has(p));
+  const inToolingButNotSettings = [];
+  const toolingNumbered = toolingText.match(/#\d+\s+([\w-]+(?:@[\w-]+)?)/g) || [];
+  const toolingPluginNames = toolingNumbered.map((s) => s.split(/\s+/)[1]);
+  for (const p of toolingPluginNames) {
+    if (!enabled.includes(p)) inToolingButNotSettings.push(p);
+  }
+  return { missingInTooling, missingInSettings: inToolingButNotSettings };
+}
+
+function loadFileMaybe(path) {
+  try {
+    return existsSync(path) ? readFileSync(path, 'utf-8') : null;
+  } catch {
+    return null;
+  }
+}
+
+export function loadInputs(projectRoot = process.cwd()) {
+  const userSettings = JSON.parse(loadFileMaybe(join(homedir(), '.claude', 'settings.json')) || '{}');
+  const projectSettings = JSON.parse(loadFileMaybe(join(projectRoot, '.claude', 'settings.json')) || '{}');
+  const merged = {
+    enabledPlugins: { ...(userSettings.enabledPlugins || {}), ...(projectSettings.enabledPlugins || {}) },
+  };
+  const tooling = loadFileMaybe(join(projectRoot, 'docs', 'Tooling_v8_3.md')) || '';
+  return { settings: merged, tooling };
+}
+
+if (process.argv[1] && process.argv[1].replace(/\\/g, '/').endsWith('/l1-watcher.mjs')) {
+  const { settings, tooling } = loadInputs();
+  const drift = detectDrift(settings, tooling);
+  if (drift.missingInTooling.length > 0) {
+    console.error(`[l1-watcher] FAIL — plugins in settings but not formalized in Tooling Прил. Н:`);
+    drift.missingInTooling.forEach((p) => console.error(`  - ${p}`));
+    console.error(`Run /claude-md-management:claude-md-improver to formalize.`);
+    process.exit(1);
+  }
+  if (drift.missingInSettings.length > 0) {
+    console.warn(`[l1-watcher] WARN — plugins in Tooling but disabled in settings:`);
+    drift.missingInSettings.forEach((p) => console.warn(`  - ${p}`));
+  }
+  console.log(`[l1-watcher] OK — 0 drift`);
+  process.exit(0);
+}
diff --git a/tools/l1-watcher.test.mjs b/tools/l1-watcher.test.mjs
new file mode 100644
index 00000000..cb8eb0ea
--- /dev/null
+++ b/tools/l1-watcher.test.mjs
@@ -0,0 +1,34 @@
+import { describe, it, expect } from 'vitest';
+import { detectDrift } from './l1-watcher.mjs';
+
+describe('detectDrift', () => {
+  it('finds plugins in settings but not in tooling', () => {
+    const settings = { enabledPlugins: { 'foo@org': true, 'bar@org': true } };
+    const tooling = 'Описание #56 foo@org интегрирован.';
+    const drift = detectDrift(settings, tooling);
+    expect(drift.missingInTooling).toEqual(['bar@org']);
+    expect(drift.missingInSettings).toEqual([]);
+  });
+
+  it('finds plugins in tooling but not in settings', () => {
+    const settings = { enabledPlugins: { 'foo@org': true } };
+    const tooling = '#56 foo@org. #57 baz@org включён.';
+    const drift = detectDrift(settings, tooling);
+    expect(drift.missingInSettings).toEqual(['baz@org']);
+  });
+
+  it('returns empty arrays when in sync', () => {
+    const settings = { enabledPlugins: { 'foo@org': true } };
+    const tooling = '#56 foo@org описан.';
+    const drift = detectDrift(settings, tooling);
+    expect(drift.missingInTooling).toEqual([]);
+    expect(drift.missingInSettings).toEqual([]);
+  });
+
+  it('handles disabled plugins (value false)', () => {
+    const settings = { enabledPlugins: { 'foo@org': false, 'bar@org': true } };
+    const tooling = '#56 bar@org.';
+    const drift = detectDrift(settings, tooling);
+    expect(drift.missingInTooling).toEqual([]);
+  });
+});
diff --git a/tools/observer-stop-hook.mjs b/tools/observer-stop-hook.mjs
index ebe6f2c6..e4896874 100644
--- a/tools/observer-stop-hook.mjs
+++ b/tools/observer-stop-hook.mjs
@@ -98,7 +98,7 @@ function currentMonth() {
 }
 
 // CLI entry point: read JSON context from stdin (Claude Code Stop-event hook contract)
-if (import.meta.url === `file://${process.argv[1].replace(/\\/g, '/')}`) {
+if (process.argv[1] && process.argv[1].replace(/\\/g, '/').endsWith('/observer-stop-hook.mjs')) {
   const chunks = [];
   process.stdin.on('data', (c) => chunks.push(c));
   process.stdin.on('end', () => {