From defbd649bb9bc32e1191ea302f601cf49a2c75ba Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sat, 14 Feb 2026 08:45:48 +0000
Subject: [PATCH 1/6] Add markdown-qa app: local-first QA interface for
 repository content

Node.js/Express backend with Claude API integration that indexes all
repository files (HTML/MD) and answers questions based on their content.
Vanilla JS frontend with session management (localStorage), streaming
responses, and restrictive API layer (only repo data access, URL whitelist).

https://claude.ai/code/session_01SDQnB7k2EERPaMDhm6xknd
---
 markdown-qa/.gitignore        |    1 +
 markdown-qa/config.json       |   11 +
 markdown-qa/package-lock.json | 1073 +++++++++++++++++++++++++++++++++
 markdown-qa/package.json      |   14 +
 markdown-qa/public/index.html |  909 ++++++++++++++++++++++++++++
 markdown-qa/server.js         |  179 ++++++
 6 files changed, 2187 insertions(+)
 create mode 100644 markdown-qa/.gitignore
 create mode 100644 markdown-qa/config.json
 create mode 100644 markdown-qa/package-lock.json
 create mode 100644 markdown-qa/package.json
 create mode 100644 markdown-qa/public/index.html
 create mode 100644 markdown-qa/server.js

diff --git a/markdown-qa/.gitignore b/markdown-qa/.gitignore
new file mode 100644
index 0000000..c2658d7
--- /dev/null
+++ b/markdown-qa/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/markdown-qa/config.json b/markdown-qa/config.json
new file mode 100644
index 0000000..647a636
--- /dev/null
+++ b/markdown-qa/config.json
@@ -0,0 +1,11 @@
+{
+  "port": 3000,
+  "repoRoot": "..",
+  "allowedFileExtensions": [".md", ".html", ".txt"],
+  "maxFileSizeBytes": 102400,
+  "whitelistedUrls": [],
+  "claude": {
+    "model": "claude-sonnet-4-20250514",
+    "maxTokens": 4096
+  }
+}
diff --git a/markdown-qa/package-lock.json b/markdown-qa/package-lock.json
new file mode 100644
index 0000000..ccf812c
--- /dev/null
+++ b/markdown-qa/package-lock.json
@@ -0,0 +1,1073 @@
+{
+  "name": "markdown-qa",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "markdown-qa",
+      "version": "1.0.0",
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+      "license": "MIT",
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+}
diff --git a/markdown-qa/package.json b/markdown-qa/package.json
new file mode 100644
index 0000000..4996939
--- /dev/null
+++ b/markdown-qa/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "markdown-qa",
+  "version": "1.0.0",
+  "description": "Local-first QA app for repository content powered by Claude AI",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node server.js"
+  },
+  "dependencies": {
+    "@anthropic-ai/sdk": "^0.39.0",
+    "express": "^4.21.0"
+  }
+}
diff --git a/markdown-qa/public/index.html b/markdown-qa/public/index.html
new file mode 100644
index 0000000..18426f5
--- /dev/null
+++ b/markdown-qa/public/index.html
@@ -0,0 +1,909 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Repository Q&A</title>
+  <style>
+    :root {
+      --bg: #f5f5f5;
+      --sidebar-bg: #1a1a2e;
+      --sidebar-text: #e0e0e0;
+      --sidebar-hover: #16213e;
+      --sidebar-active: #0f3460;
+      --chat-bg: #ffffff;
+      --user-msg: #e3f2fd;
+      --assistant-msg: #f5f5f5;
+      --primary: #1565c0;
+      --primary-hover: #0d47a1;
+      --text: #212121;
+      --text-light: #757575;
+      --border: #e0e0e0;
+      --danger: #c62828;
+      --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+      --mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
+    }
+
+    * { margin: 0; padding: 0; box-sizing: border-box; }
+
+    body {
+      font-family: var(--font);
+      background: var(--bg);
+      color: var(--text);
+      height: 100vh;
+      display: flex;
+      overflow: hidden;
+    }
+
+    /* Sidebar */
+    .sidebar {
+      width: 280px;
+      min-width: 280px;
+      background: var(--sidebar-bg);
+      color: var(--sidebar-text);
+      display: flex;
+      flex-direction: column;
+      height: 100vh;
+    }
+
+    .sidebar-header {
+      padding: 20px;
+      border-bottom: 1px solid rgba(255,255,255,0.1);
+    }
+
+    .sidebar-header h1 {
+      font-size: 18px;
+      font-weight: 600;
+      margin-bottom: 4px;
+    }
+
+    .sidebar-header p {
+      font-size: 12px;
+      opacity: 0.6;
+    }
+
+    .new-session-btn {
+      margin: 16px 20px;
+      padding: 10px 16px;
+      background: var(--primary);
+      color: white;
+      border: none;
+      border-radius: 8px;
+      cursor: pointer;
+      font-size: 14px;
+      font-family: var(--font);
+      transition: background 0.2s;
+    }
+
+    .new-session-btn:hover { background: var(--primary-hover); }
+
+    .session-list {
+      flex: 1;
+      overflow-y: auto;
+      padding: 8px;
+    }
+
+    .session-item {
+      padding: 12px;
+      border-radius: 8px;
+      cursor: pointer;
+      margin-bottom: 4px;
+      transition: background 0.15s;
+      display: flex;
+      justify-content: space-between;
+      align-items: flex-start;
+    }
+
+    .session-item:hover { background: var(--sidebar-hover); }
+    .session-item.active { background: var(--sidebar-active); }
+
+    .session-item-info {
+      flex: 1;
+      min-width: 0;
+    }
+
+    .session-item-title {
+      font-size: 14px;
+      font-weight: 500;
+      white-space: nowrap;
+      overflow: hidden;
+      text-overflow: ellipsis;
+    }
+
+    .session-item-date {
+      font-size: 11px;
+      opacity: 0.5;
+      margin-top: 2px;
+    }
+
+    .session-item-delete {
+      opacity: 0;
+      background: none;
+      border: none;
+      color: var(--sidebar-text);
+      cursor: pointer;
+      padding: 4px;
+      font-size: 16px;
+      line-height: 1;
+      border-radius: 4px;
+      transition: opacity 0.15s, color 0.15s;
+    }
+
+    .session-item:hover .session-item-delete { opacity: 0.6; }
+    .session-item-delete:hover { opacity: 1 !important; color: var(--danger); }
+
+    .sidebar-footer {
+      padding: 16px 20px;
+      border-top: 1px solid rgba(255,255,255,0.1);
+      font-size: 11px;
+      opacity: 0.4;
+    }
+
+    /* Main content */
+    .main {
+      flex: 1;
+      display: flex;
+      flex-direction: column;
+      height: 100vh;
+      min-width: 0;
+    }
+
+    /* Welcome screen */
+    .welcome {
+      flex: 1;
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      justify-content: center;
+      padding: 40px;
+      text-align: center;
+    }
+
+    .welcome h2 {
+      font-size: 28px;
+      font-weight: 600;
+      margin-bottom: 12px;
+    }
+
+    .welcome p {
+      color: var(--text-light);
+      max-width: 500px;
+      line-height: 1.6;
+      margin-bottom: 8px;
+    }
+
+    .welcome-files {
+      margin-top: 24px;
+      text-align: left;
+      background: white;
+      border: 1px solid var(--border);
+      border-radius: 12px;
+      padding: 20px;
+      max-width: 500px;
+      width: 100%;
+    }
+
+    .welcome-files h3 {
+      font-size: 14px;
+      margin-bottom: 12px;
+      color: var(--text-light);
+    }
+
+    .welcome-files ul {
+      list-style: none;
+      font-size: 13px;
+      font-family: var(--mono);
+    }
+
+    .welcome-files li {
+      padding: 4px 0;
+      color: var(--primary);
+    }
+
+    /* Chat area */
+    .chat-container {
+      flex: 1;
+      display: none;
+      flex-direction: column;
+      height: 100vh;
+    }
+
+    .chat-container.active { display: flex; }
+
+    .chat-header {
+      padding: 16px 24px;
+      border-bottom: 1px solid var(--border);
+      background: white;
+      display: flex;
+      align-items: center;
+      gap: 12px;
+    }
+
+    .chat-header-title {
+      font-size: 16px;
+      font-weight: 600;
+      flex: 1;
+    }
+
+    .chat-header-title[contenteditable]:focus {
+      outline: 2px solid var(--primary);
+      outline-offset: 2px;
+      border-radius: 4px;
+    }
+
+    .status-indicator {
+      width: 8px;
+      height: 8px;
+      border-radius: 50%;
+      background: #4caf50;
+    }
+
+    .status-indicator.offline { background: #ff9800; }
+    .status-indicator.error { background: var(--danger); }
+
+    .chat-messages {
+      flex: 1;
+      overflow-y: auto;
+      padding: 24px;
+    }
+
+    .message {
+      max-width: 800px;
+      margin: 0 auto 20px;
+      display: flex;
+      gap: 12px;
+    }
+
+    .message-avatar {
+      width: 32px;
+      height: 32px;
+      border-radius: 50%;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      font-size: 14px;
+      font-weight: 600;
+      flex-shrink: 0;
+    }
+
+    .message.user .message-avatar {
+      background: var(--primary);
+      color: white;
+    }
+
+    .message.assistant .message-avatar {
+      background: #7c4dff;
+      color: white;
+    }
+
+    .message-content {
+      flex: 1;
+      min-width: 0;
+    }
+
+    .message-role {
+      font-size: 12px;
+      font-weight: 600;
+      margin-bottom: 4px;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+      color: var(--text-light);
+    }
+
+    .message-text {
+      font-size: 15px;
+      line-height: 1.7;
+      word-wrap: break-word;
+    }
+
+    .message-text p { margin-bottom: 12px; }
+    .message-text p:last-child { margin-bottom: 0; }
+
+    .message-text pre {
+      background: #1e1e1e;
+      color: #d4d4d4;
+      padding: 16px;
+      border-radius: 8px;
+      overflow-x: auto;
+      margin: 12px 0;
+      font-family: var(--mono);
+      font-size: 13px;
+      line-height: 1.5;
+    }
+
+    .message-text code {
+      background: #f0f0f0;
+      padding: 2px 6px;
+      border-radius: 4px;
+      font-family: var(--mono);
+      font-size: 13px;
+    }
+
+    .message-text pre code {
+      background: none;
+      padding: 0;
+    }
+
+    .message-text ul, .message-text ol {
+      margin: 8px 0 8px 20px;
+    }
+
+    .message-text li { margin-bottom: 4px; }
+
+    .message-text strong { font-weight: 600; }
+
+    .message-text blockquote {
+      border-left: 3px solid var(--primary);
+      padding-left: 16px;
+      margin: 12px 0;
+      color: var(--text-light);
+    }
+
+    .message-text h1, .message-text h2, .message-text h3 {
+      margin: 16px 0 8px;
+    }
+
+    .message-text h1 { font-size: 20px; }
+    .message-text h2 { font-size: 18px; }
+    .message-text h3 { font-size: 16px; }
+
+    .message-text table {
+      border-collapse: collapse;
+      margin: 12px 0;
+      width: 100%;
+    }
+
+    .message-text th, .message-text td {
+      border: 1px solid var(--border);
+      padding: 8px 12px;
+      text-align: left;
+    }
+
+    .message-text th {
+      background: var(--bg);
+      font-weight: 600;
+    }
+
+    .streaming-cursor {
+      display: inline-block;
+      width: 8px;
+      height: 18px;
+      background: var(--primary);
+      animation: blink 1s infinite;
+      vertical-align: text-bottom;
+      margin-left: 2px;
+    }
+
+    @keyframes blink {
+      0%, 50% { opacity: 1; }
+      51%, 100% { opacity: 0; }
+    }
+
+    .message-usage {
+      font-size: 11px;
+      color: var(--text-light);
+      margin-top: 8px;
+    }
+
+    /* Input area */
+    .chat-input-area {
+      padding: 16px 24px 24px;
+      background: white;
+      border-top: 1px solid var(--border);
+    }
+
+    .chat-input-wrapper {
+      max-width: 800px;
+      margin: 0 auto;
+      display: flex;
+      gap: 12px;
+      align-items: flex-end;
+    }
+
+    .chat-input {
+      flex: 1;
+      padding: 12px 16px;
+      border: 2px solid var(--border);
+      border-radius: 12px;
+      font-size: 15px;
+      font-family: var(--font);
+      resize: none;
+      min-height: 48px;
+      max-height: 200px;
+      outline: none;
+      transition: border-color 0.2s;
+      line-height: 1.5;
+    }
+
+    .chat-input:focus { border-color: var(--primary); }
+
+    .chat-input:disabled {
+      background: var(--bg);
+      cursor: not-allowed;
+    }
+
+    .send-btn {
+      padding: 12px 20px;
+      background: var(--primary);
+      color: white;
+      border: none;
+      border-radius: 12px;
+      cursor: pointer;
+      font-size: 15px;
+      font-family: var(--font);
+      transition: background 0.2s;
+      white-space: nowrap;
+    }
+
+    .send-btn:hover { background: var(--primary-hover); }
+    .send-btn:disabled { background: #bdbdbd; cursor: not-allowed; }
+
+    /* Responsive */
+    @media (max-width: 768px) {
+      .sidebar { width: 60px; min-width: 60px; }
+      .sidebar-header h1, .sidebar-header p,
+      .session-item-info, .sidebar-footer,
+      .new-session-btn span { display: none; }
+      .new-session-btn { margin: 12px 8px; padding: 10px; text-align: center; }
+      .session-item { padding: 8px; justify-content: center; }
+      .session-item-delete { display: none; }
+      .chat-messages { padding: 16px; }
+      .chat-input-area { padding: 12px; }
+    }
+  </style>
+</head>
+<body>
+
+  <aside class="sidebar">
+    <div class="sidebar-header">
+      <h1>Repo Q&A</h1>
+      <p>Fragen zum Repository</p>
+    </div>
+    <button class="new-session-btn" onclick="createNewSession()">
+      + <span>Neue Session</span>
+    </button>
+    <div class="session-list" id="sessionList"></div>
+    <div class="sidebar-footer">Local-first &middot; Sessions im Browser gespeichert</div>
+  </aside>
+
+  <main class="main">
+    <div class="welcome" id="welcomeScreen">
+      <h2>Repository Q&A</h2>
+      <p>Stelle Fragen zu den Inhalten dieses Repositories. Claude AI beantwortet sie basierend auf den verfügbaren Dateien.</p>
+      <p>Erstelle eine neue Session, um loszulegen.</p>
+      <div class="welcome-files">
+        <h3>Verfügbare Dateien:</h3>
+        <ul id="fileList"><li>Lade...</li></ul>
+      </div>
+    </div>
+
+    <div class="chat-container" id="chatContainer">
+      <div class="chat-header">
+        <div class="status-indicator" id="statusIndicator"></div>
+        <div class="chat-header-title" id="chatTitle" contenteditable="true" spellcheck="false"></div>
+      </div>
+      <div class="chat-messages" id="chatMessages"></div>
+      <div class="chat-input-area">
+        <div class="chat-input-wrapper">
+          <textarea class="chat-input" id="chatInput" placeholder="Stelle eine Frage zum Repository..." rows="1"></textarea>
+          <button class="send-btn" id="sendBtn" onclick="sendMessage()">Senden</button>
+        </div>
+      </div>
+    </div>
+  </main>
+
+  <script>
+    // --- Storage ---
+    const STORAGE_KEY = 'repo-qa-sessions';
+
+    function loadSessions() {
+      try {
+        return JSON.parse(localStorage.getItem(STORAGE_KEY)) || {};
+      } catch { return {}; }
+    }
+
+    function saveSessions(sessions) {
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(sessions));
+    }
+
+    function getSession(id) {
+      return loadSessions()[id] || null;
+    }
+
+    function saveSession(session) {
+      const sessions = loadSessions();
+      sessions[session.id] = session;
+      saveSessions(sessions);
+    }
+
+    function deleteSession(id) {
+      const sessions = loadSessions();
+      delete sessions[id];
+      saveSessions(sessions);
+      if (currentSessionId === id) {
+        currentSessionId = null;
+        showWelcome();
+      }
+      renderSessionList();
+    }
+
+    // --- State ---
+    let currentSessionId = null;
+    let isStreaming = false;
+
+    // --- Session Management ---
+
+    function createNewSession() {
+      const id = 'session_' + Date.now() + '_' + Math.random().toString(36).slice(2, 8);
+      const session = {
+        id,
+        title: 'Neue Session',
+        messages: [],
+        createdAt: new Date().toISOString(),
+        updatedAt: new Date().toISOString(),
+      };
+      saveSession(session);
+      switchToSession(id);
+      renderSessionList();
+      document.getElementById('chatInput').focus();
+    }
+
+    function switchToSession(id) {
+      const session = getSession(id);
+      if (!session) return;
+
+      currentSessionId = id;
+      document.getElementById('welcomeScreen').style.display = 'none';
+      const chat = document.getElementById('chatContainer');
+      chat.classList.add('active');
+
+      document.getElementById('chatTitle').textContent = session.title;
+      renderMessages(session.messages);
+      renderSessionList();
+      scrollToBottom();
+    }
+
+    function showWelcome() {
+      currentSessionId = null;
+      document.getElementById('welcomeScreen').style.display = 'flex';
+      document.getElementById('chatContainer').classList.remove('active');
+      renderSessionList();
+    }
+
+    // --- Rendering ---
+
+    function renderSessionList() {
+      const sessions = loadSessions();
+      const list = document.getElementById('sessionList');
+      const sorted = Object.values(sessions).sort((a, b) =>
+        new Date(b.updatedAt) - new Date(a.updatedAt)
+      );
+
+      list.innerHTML = sorted.map(s => `
+        <div class="session-item ${s.id === currentSessionId ? 'active' : ''}"
+             onclick="switchToSession('${s.id}')">
+          <div class="session-item-info">
+            <div class="session-item-title">${escapeHtml(s.title)}</div>
+            <div class="session-item-date">${formatDate(s.updatedAt)} &middot; ${s.messages.length} Nachrichten</div>
+          </div>
+          <button class="session-item-delete" onclick="event.stopPropagation(); confirmDelete('${s.id}')" title="Löschen">&times;</button>
+        </div>
+      `).join('');
+    }
+
+    function confirmDelete(id) {
+      if (confirm('Session wirklich löschen?')) {
+        deleteSession(id);
+      }
+    }
+
+    function renderMessages(messages) {
+      const container = document.getElementById('chatMessages');
+      container.innerHTML = messages.map(m => createMessageHtml(m)).join('');
+    }
+
+    function createMessageHtml(msg) {
+      const avatar = msg.role === 'user' ? 'Du' : 'AI';
+      const roleLabel = msg.role === 'user' ? 'Du' : 'Claude';
+      const usageHtml = msg.usage
+        ? `<div class="message-usage">Tokens: ${msg.usage.input_tokens} in / ${msg.usage.output_tokens} out</div>`
+        : '';
+
+      return `
+        <div class="message ${msg.role}">
+          <div class="message-avatar">${avatar}</div>
+          <div class="message-content">
+            <div class="message-role">${roleLabel}</div>
+            <div class="message-text">${renderMarkdown(msg.content)}</div>
+            ${usageHtml}
+          </div>
+        </div>
+      `;
+    }
+
+    // --- Markdown rendering (lightweight) ---
+
+    function renderMarkdown(text) {
+      if (!text) return '';
+      let html = escapeHtml(text);
+
+      // Code blocks
+      html = html.replace(/```(\w*)\n([\s\S]*?)```/g, (_, lang, code) =>
+        `<pre><code class="language-${lang}">${code.trim()}</code></pre>`
+      );
+
+      // Inline code
+      html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
+
+      // Bold
+      html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
+
+      // Italic
+      html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
+
+      // Headers
+      html = html.replace(/^### (.+)$/gm, '<h3>$1</h3>');
+      html = html.replace(/^## (.+)$/gm, '<h2>$1</h2>');
+      html = html.replace(/^# (.+)$/gm, '<h1>$1</h1>');
+
+      // Blockquotes
+      html = html.replace(/^&gt; (.+)$/gm, '<blockquote>$1</blockquote>');
+
+      // Unordered lists
+      html = html.replace(/^[-*] (.+)$/gm, '<li>$1</li>');
+      html = html.replace(/(<li>.*<\/li>\n?)+/g, match => `<ul>${match}</ul>`);
+
+      // Ordered lists
+      html = html.replace(/^\d+\. (.+)$/gm, '<li>$1</li>');
+
+      // Line breaks into paragraphs
+      html = html.replace(/\n\n/g, '</p><p>');
+      html = '<p>' + html + '</p>';
+
+      // Clean up empty paragraphs
+      html = html.replace(/<p>\s*<\/p>/g, '');
+      html = html.replace(/<p>(<h[123]>)/g, '$1');
+      html = html.replace(/(<\/h[123]>)<\/p>/g, '$1');
+      html = html.replace(/<p>(<pre>)/g, '$1');
+      html = html.replace(/(<\/pre>)<\/p>/g, '$1');
+      html = html.replace(/<p>(<ul>)/g, '$1');
+      html = html.replace(/(<\/ul>)<\/p>/g, '$1');
+      html = html.replace(/<p>(<blockquote>)/g, '$1');
+      html = html.replace(/(<\/blockquote>)<\/p>/g, '$1');
+
+      return html;
+    }
+
+    function escapeHtml(text) {
+      const div = document.createElement('div');
+      div.textContent = text;
+      return div.innerHTML;
+    }
+
+    function formatDate(iso) {
+      const d = new Date(iso);
+      const now = new Date();
+      const diff = now - d;
+      if (diff < 60000) return 'Gerade eben';
+      if (diff < 3600000) return `vor ${Math.floor(diff / 60000)} Min.`;
+      if (diff < 86400000) return `vor ${Math.floor(diff / 3600000)} Std.`;
+      return d.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' });
+    }
+
+    // --- Chat ---
+
+    async function sendMessage() {
+      if (isStreaming || !currentSessionId) return;
+
+      const input = document.getElementById('chatInput');
+      const text = input.value.trim();
+      if (!text) return;
+
+      input.value = '';
+      input.style.height = 'auto';
+
+      const session = getSession(currentSessionId);
+      if (!session) return;
+
+      // Add user message
+      session.messages.push({ role: 'user', content: text });
+      session.updatedAt = new Date().toISOString();
+
+      // Auto-title on first message
+      if (session.messages.length === 1) {
+        session.title = text.length > 60 ? text.slice(0, 57) + '...' : text;
+        document.getElementById('chatTitle').textContent = session.title;
+      }
+
+      saveSession(session);
+      renderMessages(session.messages);
+      renderSessionList();
+      scrollToBottom();
+
+      // Start streaming response
+      isStreaming = true;
+      updateUI();
+
+      const messagesDiv = document.getElementById('chatMessages');
+      const assistantMsg = document.createElement('div');
+      assistantMsg.className = 'message assistant';
+      assistantMsg.innerHTML = `
+        <div class="message-avatar">AI</div>
+        <div class="message-content">
+          <div class="message-role">Claude</div>
+          <div class="message-text"><span class="streaming-cursor"></span></div>
+        </div>
+      `;
+      messagesDiv.appendChild(assistantMsg);
+      scrollToBottom();
+
+      const textEl = assistantMsg.querySelector('.message-text');
+      let fullText = '';
+
+      try {
+        setStatus('streaming');
+
+        const response = await fetch('/api/chat', {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({
+            messages: session.messages.map(m => ({ role: m.role, content: m.content })),
+            sessionContext: session.title,
+          }),
+        });
+
+        if (!response.ok) {
+          const err = await response.json();
+          throw new Error(err.error || 'API request failed');
+        }
+
+        const reader = response.body.getReader();
+        const decoder = new TextDecoder();
+        let buffer = '';
+        let usage = null;
+
+        while (true) {
+          const { done, value } = await reader.read();
+          if (done) break;
+
+          buffer += decoder.decode(value, { stream: true });
+          const lines = buffer.split('\n');
+          buffer = lines.pop();
+
+          for (const line of lines) {
+            if (!line.startsWith('data: ')) continue;
+            try {
+              const data = JSON.parse(line.slice(6));
+              if (data.type === 'delta') {
+                fullText += data.text;
+                textEl.innerHTML = renderMarkdown(fullText) + '<span class="streaming-cursor"></span>';
+                scrollToBottom();
+              } else if (data.type === 'done') {
+                usage = data.usage;
+              } else if (data.type === 'error') {
+                throw new Error(data.error);
+              }
+            } catch (e) {
+              if (e.message !== 'Unexpected end of JSON input') throw e;
+            }
+          }
+        }
+
+        // Finalize
+        textEl.innerHTML = renderMarkdown(fullText);
+        if (usage) {
+          const usageEl = document.createElement('div');
+          usageEl.className = 'message-usage';
+          usageEl.textContent = `Tokens: ${usage.input_tokens} in / ${usage.output_tokens} out`;
+          assistantMsg.querySelector('.message-content').appendChild(usageEl);
+        }
+
+        // Save assistant message
+        session.messages.push({ role: 'assistant', content: fullText, usage });
+        session.updatedAt = new Date().toISOString();
+        saveSession(session);
+        renderSessionList();
+        setStatus('online');
+
+      } catch (err) {
+        textEl.innerHTML = `<p style="color: var(--danger)">Fehler: ${escapeHtml(err.message)}</p>`;
+        setStatus('error');
+
+        // Save error as message so it's visible when revisiting
+        session.messages.push({ role: 'assistant', content: `Fehler: ${err.message}` });
+        session.updatedAt = new Date().toISOString();
+        saveSession(session);
+      }
+
+      isStreaming = false;
+      updateUI();
+      scrollToBottom();
+    }
+
+    function updateUI() {
+      const input = document.getElementById('chatInput');
+      const btn = document.getElementById('sendBtn');
+      input.disabled = isStreaming;
+      btn.disabled = isStreaming;
+      btn.textContent = isStreaming ? 'Läuft...' : 'Senden';
+    }
+
+    function setStatus(state) {
+      const el = document.getElementById('statusIndicator');
+      el.className = 'status-indicator';
+      if (state === 'offline') el.classList.add('offline');
+      if (state === 'error') el.classList.add('error');
+    }
+
+    function scrollToBottom() {
+      const el = document.getElementById('chatMessages');
+      requestAnimationFrame(() => { el.scrollTop = el.scrollHeight; });
+    }
+
+    // --- Input handling ---
+
+    const chatInput = document.getElementById('chatInput');
+
+    chatInput.addEventListener('keydown', (e) => {
+      if (e.key === 'Enter' && !e.shiftKey) {
+        e.preventDefault();
+        sendMessage();
+      }
+    });
+
+    chatInput.addEventListener('input', () => {
+      chatInput.style.height = 'auto';
+      chatInput.style.height = Math.min(chatInput.scrollHeight, 200) + 'px';
+    });
+
+    // Session title editing
+    document.getElementById('chatTitle').addEventListener('blur', (e) => {
+      if (!currentSessionId) return;
+      const session = getSession(currentSessionId);
+      if (!session) return;
+      const newTitle = e.target.textContent.trim();
+      if (newTitle && newTitle !== session.title) {
+        session.title = newTitle;
+        saveSession(session);
+        renderSessionList();
+      }
+    });
+
+    document.getElementById('chatTitle').addEventListener('keydown', (e) => {
+      if (e.key === 'Enter') {
+        e.preventDefault();
+        e.target.blur();
+      }
+    });
+
+    // --- Init ---
+
+    async function loadFiles() {
+      try {
+        const res = await fetch('/api/files');
+        const data = await res.json();
+        const ul = document.getElementById('fileList');
+        ul.innerHTML = data.files.map(f => `<li>${escapeHtml(f.path)}</li>`).join('');
+        setStatus('online');
+      } catch {
+        document.getElementById('fileList').innerHTML = '<li>Offline - keine Verbindung zum Server</li>';
+        setStatus('offline');
+      }
+    }
+
+    function init() {
+      renderSessionList();
+      loadFiles();
+
+      // Check for API health
+      fetch('/api/health')
+        .then(r => r.json())
+        .then(() => setStatus('online'))
+        .catch(() => setStatus('offline'));
+    }
+
+    init();
+  </script>
+
+</body>
+</html>
diff --git a/markdown-qa/server.js b/markdown-qa/server.js
new file mode 100644
index 0000000..908bbea
--- /dev/null
+++ b/markdown-qa/server.js
@@ -0,0 +1,179 @@
+const express = require('express');
+const path = require('path');
+const fs = require('fs');
+const Anthropic = require('@anthropic-ai/sdk');
+
+const config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), 'utf-8'));
+
+const app = express();
+app.use(express.json());
+app.use(express.static(path.join(__dirname, 'public')));
+
+const REPO_ROOT = path.resolve(__dirname, config.repoRoot);
+
+// --- Restrictive file access ---
+
+function isAllowedFile(filePath) {
+  const resolved = path.resolve(REPO_ROOT, filePath);
+  if (!resolved.startsWith(REPO_ROOT)) return false;
+  const ext = path.extname(resolved).toLowerCase();
+  if (!config.allowedFileExtensions.includes(ext)) return false;
+  if (resolved.includes('node_modules')) return false;
+  if (resolved.includes('.git')) return false;
+  return true;
+}
+
+function indexRepoFiles() {
+  const files = [];
+  function walk(dir) {
+    let entries;
+    try { entries = fs.readdirSync(dir, { withFileTypes: true }); }
+    catch { return; }
+    for (const entry of entries) {
+      const full = path.join(dir, entry.name);
+      if (entry.name.startsWith('.')) continue;
+      if (entry.name === 'node_modules') continue;
+      if (entry.name === 'markdown-qa') continue;
+      if (entry.isDirectory()) {
+        walk(full);
+      } else {
+        const rel = path.relative(REPO_ROOT, full);
+        if (isAllowedFile(rel)) {
+          const stat = fs.statSync(full);
+          if (stat.size <= config.maxFileSizeBytes) {
+            files.push({ path: rel, size: stat.size });
+          }
+        }
+      }
+    }
+  }
+  walk(REPO_ROOT);
+  return files;
+}
+
+function readRepoFile(relPath) {
+  if (!isAllowedFile(relPath)) return null;
+  const full = path.resolve(REPO_ROOT, relPath);
+  try {
+    const content = fs.readFileSync(full, 'utf-8');
+    return content;
+  } catch {
+    return null;
+  }
+}
+
+function buildRepoContext() {
+  const files = indexRepoFiles();
+  const parts = [];
+  for (const file of files) {
+    const content = readRepoFile(file.path);
+    if (content) {
+      parts.push(`--- File: ${file.path} ---\n${content}\n`);
+    }
+  }
+  return parts.join('\n');
+}
+
+// --- API Routes ---
+
+// List available repo files
+app.get('/api/files', (_req, res) => {
+  const files = indexRepoFiles();
+  res.json({ files });
+});
+
+// Chat endpoint with streaming (SSE)
+app.post('/api/chat', async (req, res) => {
+  const { messages, sessionContext } = req.body;
+
+  if (!messages || !Array.isArray(messages) || messages.length === 0) {
+    return res.status(400).json({ error: 'messages array is required' });
+  }
+
+  // Validate messages contain only text
+  for (const msg of messages) {
+    if (typeof msg.content !== 'string') {
+      return res.status(400).json({ error: 'Only text messages are allowed' });
+    }
+    if (!['user', 'assistant'].includes(msg.role)) {
+      return res.status(400).json({ error: 'Invalid message role' });
+    }
+  }
+
+  const apiKey = process.env.ANTHROPIC_API_KEY;
+  if (!apiKey) {
+    return res.status(500).json({ error: 'ANTHROPIC_API_KEY not configured' });
+  }
+
+  const client = new Anthropic({ apiKey });
+  const repoContext = buildRepoContext();
+
+  const systemPrompt = `Du bist ein hilfreicher Assistent, der Fragen zu den Inhalten eines Repositories beantwortet.
+
+Du hast Zugriff auf folgende Dateien aus dem Repository:
+
+<repository-content>
+${repoContext}
+</repository-content>
+
+Regeln:
+- Beantworte Fragen ausschließlich basierend auf dem Inhalt des Repositories.
+- Wenn die Antwort nicht in den Repository-Dateien zu finden ist, sage das ehrlich.
+- Zitiere relevante Dateien und Abschnitte in deinen Antworten.
+- Antworte in der Sprache, in der die Frage gestellt wird.
+- Du darfst keine externen URLs aufrufen oder Informationen aus externen Quellen verwenden, außer diese sind explizit in der Whitelist: ${JSON.stringify(config.whitelistedUrls)}
+${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
+
+  // Set up SSE
+  res.writeHead(200, {
+    'Content-Type': 'text/event-stream',
+    'Cache-Control': 'no-cache',
+    'Connection': 'keep-alive',
+  });
+
+  try {
+    const stream = await client.messages.stream({
+      model: config.claude.model,
+      max_tokens: config.claude.maxTokens,
+      system: systemPrompt,
+      messages: messages.map(m => ({ role: m.role, content: m.content })),
+    });
+
+    for await (const event of stream) {
+      if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
+        res.write(`data: ${JSON.stringify({ type: 'delta', text: event.delta.text })}\n\n`);
+      }
+    }
+
+    const finalMessage = await stream.finalMessage();
+    res.write(`data: ${JSON.stringify({
+      type: 'done',
+      usage: {
+        input_tokens: finalMessage.usage.input_tokens,
+        output_tokens: finalMessage.usage.output_tokens,
+      }
+    })}\n\n`);
+  } catch (err) {
+    res.write(`data: ${JSON.stringify({ type: 'error', error: err.message })}\n\n`);
+  }
+
+  res.end();
+});
+
+// Health check
+app.get('/api/health', (_req, res) => {
+  res.json({ status: 'ok', files: indexRepoFiles().length });
+});
+
+// Serve frontend for all other routes
+app.get('*', (_req, res) => {
+  res.sendFile(path.join(__dirname, 'public', 'index.html'));
+});
+
+const PORT = config.port;
+app.listen(PORT, () => {
+  const files = indexRepoFiles();
+  console.log(`Markdown QA Server running on http://localhost:${PORT}`);
+  console.log(`Repository root: ${REPO_ROOT}`);
+  console.log(`Indexed ${files.length} files: ${files.map(f => f.path).join(', ')}`);
+});

From c366c0be176b90987a064d708a7cbb499156ef8f Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sat, 14 Feb 2026 09:12:36 +0000
Subject: [PATCH 2/6] Switch from Claude to Gemini AI and localStorage to
 IndexedDB
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Replace @anthropic-ai/sdk with @google/genai SDK
- Use Gemini 2.5 Flash model with generateContentStream for streaming
- Convert message format (assistant→model role mapping)
- Replace localStorage with IndexedDB for session persistence
- Add indexed object store with updatedAt index
- All storage operations now async with proper transaction handling
- Update UI branding from Claude to Gemini

https://claude.ai/code/session_01SDQnB7k2EERPaMDhm6xknd
---
 markdown-qa/config.json       |    6 +-
 markdown-qa/package-lock.json | 1046 +++++++++++++++++++++++++++------
 markdown-qa/package.json      |    4 +-
 markdown-qa/public/index.html |  178 +++---
 markdown-qa/server.js         |   42 +-
 5 files changed, 1019 insertions(+), 257 deletions(-)

diff --git a/markdown-qa/config.json b/markdown-qa/config.json
index 647a636..059c83b 100644
--- a/markdown-qa/config.json
+++ b/markdown-qa/config.json
@@ -4,8 +4,8 @@
   "allowedFileExtensions": [".md", ".html", ".txt"],
   "maxFileSizeBytes": 102400,
   "whitelistedUrls": [],
-  "claude": {
-    "model": "claude-sonnet-4-20250514",
-    "maxTokens": 4096
+  "gemini": {
+    "model": "gemini-2.5-flash",
+    "maxOutputTokens": 4096
   }
 }
diff --git a/markdown-qa/package-lock.json b/markdown-qa/package-lock.json
index ccf812c..612ad74 100644
--- a/markdown-qa/package-lock.json
+++ b/markdown-qa/package-lock.json
@@ -8,54 +8,131 @@
       "name": "markdown-qa",
       "version": "1.0.0",
       "dependencies": {
-        "@anthropic-ai/sdk": "^0.39.0",
+        "@google/genai": "^1.41.0",
         "express": "^4.21.0"
       }
     },
-    "node_modules/@anthropic-ai/sdk": {
-      "version": "0.39.0",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.39.0.tgz",
-      "integrity": "sha512-eMyDIPRZbt1CCLErRCi3exlAvNkBtRe+kW5vvJyef93PmNr/clstYgHhtvmkxN82nlKgzyGPCyGxrm0JQ1ZIdg==",
-      "license": "MIT",
+    "node_modules/@google/genai": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@google/genai/-/genai-1.41.0.tgz",
+      "integrity": "sha512-S4WGil+PG0NBQRAx+0yrQuM/TWOLn2gGEy5wn4IsoOI6ouHad0P61p3OWdhJ3aqr9kfj8o904i/jevfaGoGuIQ==",
+      "license": "Apache-2.0",
       "dependencies": {
-        "@types/node": "^18.11.18",
-        "@types/node-fetch": "^2.6.4",
-        "abort-controller": "^3.0.0",
-        "agentkeepalive": "^4.2.1",
-        "form-data-encoder": "1.7.2",
-        "formdata-node": "^4.3.2",
-        "node-fetch": "^2.6.7"
+        "google-auth-library": "^10.3.0",
+        "p-retry": "^7.1.1",
+        "protobufjs": "^7.5.4",
+        "ws": "^8.18.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "@modelcontextprotocol/sdk": "^1.25.2"
+      },
+      "peerDependenciesMeta": {
+        "@modelcontextprotocol/sdk": {
+          "optional": true
+        }
       }
     },
-    "node_modules/@types/node": {
-      "version": "18.19.130",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.130.tgz",
-      "integrity": "sha512-GRaXQx6jGfL8sKfaIDD6OupbIHBr9jv7Jnaml9tB7l4v068PAOXqfcujMMo5PhbIs6ggR1XODELqahT2R8v0fg==",
-      "license": "MIT",
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
+      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
+      "license": "ISC",
       "dependencies": {
-        "undici-types": "~5.26.4"
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
       }
     },
-    "node_modules/@types/node-fetch": {
-      "version": "2.6.13",
-      "resolved": "https://registry.npmjs.org/@types/node-fetch/-/node-fetch-2.6.13.tgz",
-      "integrity": "sha512-QGpRVpzSaUs30JBSGPjOg4Uveu384erbHBoT1zeONvyCfwQxIkUshLAOqN/k9EjGviPRmWTTe6aH2qySWKTVSw==",
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
       "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@protobufjs/aspromise": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
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+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/base64": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/base64/-/base64-1.1.2.tgz",
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+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/codegen": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@protobufjs/codegen/-/codegen-2.0.4.tgz",
+      "integrity": "sha512-YyFaikqM5sH0ziFZCN3xDC7zeGaB/d0IUb9CATugHWbd1FRFwWwt4ld4OYMPWu5a3Xe01mGAULCdqhMlPl29Jg==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/eventemitter": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/eventemitter/-/eventemitter-1.1.0.tgz",
+      "integrity": "sha512-j9ednRT81vYJ9OfVuXG6ERSTdEL1xVsNgqpkxMsbIabzSo3goCjDIveeGv5d03om39ML71RdmrGNjG5SReBP/Q==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/fetch": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/fetch/-/fetch-1.1.0.tgz",
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+      "license": "BSD-3-Clause",
       "dependencies": {
-        "@types/node": "*",
-        "form-data": "^4.0.4"
+        "@protobufjs/aspromise": "^1.1.1",
+        "@protobufjs/inquire": "^1.1.0"
       }
     },
-    "node_modules/abort-controller": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
-      "integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
+    "node_modules/@protobufjs/float": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/float/-/float-1.0.2.tgz",
+      "integrity": "sha512-Ddb+kVXlXst9d+R9PfTIxh1EdNkgoRe5tOX6t01f1lYWOvJnSPDBlG241QLzcyPdoNTsblLUdujGSE4RzrTZGQ==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/inquire": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/inquire/-/inquire-1.1.0.tgz",
+      "integrity": "sha512-kdSefcPdruJiFMVSbn801t4vFK7KB/5gd2fYvrxhuJYg8ILrmn9SKSX2tZdV6V+ksulWqS7aXjBcRXl3wHoD9Q==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/path": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/path/-/path-1.1.2.tgz",
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+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/pool": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/pool/-/pool-1.1.0.tgz",
+      "integrity": "sha512-0kELaGSIDBKvcgS4zkjz1PeddatrjYcmMWOlAuAPwAeccUrPHdUqo/J6LiymHHEiJT5NrF1UVwxY14f+fy4WQw==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/utf8": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.0.tgz",
+      "integrity": "sha512-Vvn3zZrhQZkkBE8LSuW3em98c0FwgO4nxzv6OdSxPKJIEKY2bGbHn+mhGIPerzI4twdxaP8/0+06HBpwf345Lw==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@types/node": {
+      "version": "18.19.130",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.130.tgz",
+      "integrity": "sha512-GRaXQx6jGfL8sKfaIDD6OupbIHBr9jv7Jnaml9tB7l4v068PAOXqfcujMMo5PhbIs6ggR1XODELqahT2R8v0fg==",
       "license": "MIT",
       "dependencies": {
-        "event-target-shim": "^5.0.0"
-      },
-      "engines": {
-        "node": ">=6.5"
+        "undici-types": "~5.26.4"
       }
     },
     "node_modules/accepts": {
@@ -71,16 +148,37 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/agentkeepalive": {
-      "version": "4.6.0",
-      "resolved": "https://registry.npmjs.org/agentkeepalive/-/agentkeepalive-4.6.0.tgz",
-      "integrity": "sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ==",
+    "node_modules/agent-base": {
+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.4.tgz",
+      "integrity": "sha512-MnA+YT8fwfJPgBx3m60MNqakm30XOkyIoH1y6huTQvC0PwZG7ki8NacLBcrPbNoo8vEZy7Jpuk7+jMO+CUovTQ==",
       "license": "MIT",
-      "dependencies": {
-        "humanize-ms": "^1.2.1"
+      "engines": {
+        "node": ">= 14"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
       },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "license": "MIT",
       "engines": {
-        "node": ">= 8.0.0"
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
     "node_modules/array-flatten": {
@@ -89,12 +187,41 @@
       "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
       "license": "MIT"
     },
-    "node_modules/asynckit": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+    "node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "license": "MIT"
+    },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
       "license": "MIT"
     },
+    "node_modules/bignumber.js": {
+      "version": "9.3.1",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-9.3.1.tgz",
+      "integrity": "sha512-Ko0uX15oIUS7wJ3Rb30Fs6SkVbLmPBAKdlm7q9+ak9bbIeFf0MwuBsQV6z7+X768/cHsfg+WlysDWJcmthjsjQ==",
+      "license": "MIT",
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/body-parser": {
       "version": "1.20.4",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.4.tgz",
@@ -119,6 +246,21 @@
         "npm": "1.2.8000 || >= 1.4.16"
       }
     },
+    "node_modules/brace-expansion": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.2.tgz",
+      "integrity": "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==",
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/buffer-equal-constant-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
+      "integrity": "sha512-zRpUiDwd/xk6ADqPMATG8vc9VPrkck7T07OIx0gnjmJAnHnTVXNQG3vfvWNuiZIkwu9KrKdA1iJKfsfTVxE6NA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/bytes": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
@@ -157,18 +299,24 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/combined-stream": {
-      "version": "1.0.8",
-      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
-      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
       "license": "MIT",
       "dependencies": {
-        "delayed-stream": "~1.0.0"
+        "color-name": "~1.1.4"
       },
       "engines": {
-        "node": ">= 0.8"
+        "node": ">=7.0.0"
       }
     },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "license": "MIT"
+    },
     "node_modules/content-disposition": {
       "version": "0.5.4",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
@@ -205,6 +353,29 @@
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       "license": "MIT"
     },
+    "node_modules/cross-spawn": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
+      "integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
+      "license": "MIT",
+      "dependencies": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/data-uri-to-buffer": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+      "integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
     "node_modules/debug": {
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -214,15 +385,6 @@
         "ms": "2.0.0"
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-    "node_modules/delayed-stream": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
-      "license": "MIT",
-      "engines": {
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-      }
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       "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -256,12 +418,33 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/eastasianwidth": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/eastasianwidth/-/eastasianwidth-0.2.0.tgz",
+      "integrity": "sha512-I88TYZWc9XiYHRQ4/3c5rjjfgkjhLyW2luGIheGERbNQ6OY7yTybanSpDXZa8y7VUP9YmDcYa+eyq4ca7iLqWA==",
+      "license": "MIT"
+    },
+    "node_modules/ecdsa-sig-formatter": {
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+      "license": "MIT"
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.19.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.19.0.tgz",
+      "integrity": "sha512-blAT2mjOEIi0ZzruJfIhb3nps74PRWTCz1IjglWEEpQl5XS/UNama6u2/rjFkDDouqr4L67ry+1aGIALViWjDg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
       }
     }
   }
diff --git a/markdown-qa/package.json b/markdown-qa/package.json
index 4996939..316302a 100644
--- a/markdown-qa/package.json
+++ b/markdown-qa/package.json
@@ -1,14 +1,14 @@
 {
   "name": "markdown-qa",
   "version": "1.0.0",
-  "description": "Local-first QA app for repository content powered by Claude AI",
+  "description": "Local-first QA app for repository content powered by Gemini AI",
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
     "dev": "node server.js"
   },
   "dependencies": {
-    "@anthropic-ai/sdk": "^0.39.0",
+    "@google/genai": "^1.41.0",
     "express": "^4.21.0"
   }
 }
diff --git a/markdown-qa/public/index.html b/markdown-qa/public/index.html
index 18426f5..fce38b4 100644
--- a/markdown-qa/public/index.html
+++ b/markdown-qa/public/index.html
@@ -463,13 +463,13 @@ <h1>Repo Q&A</h1>
       + <span>Neue Session</span>
     </button>
     <div class="session-list" id="sessionList"></div>
-    <div class="sidebar-footer">Local-first &middot; Sessions im Browser gespeichert</div>
+    <div class="sidebar-footer">Local-first &middot; Sessions in IndexedDB gespeichert</div>
   </aside>
 
   <main class="main">
     <div class="welcome" id="welcomeScreen">
       <h2>Repository Q&A</h2>
-      <p>Stelle Fragen zu den Inhalten dieses Repositories. Claude AI beantwortet sie basierend auf den verfügbaren Dateien.</p>
+      <p>Stelle Fragen zu den Inhalten dieses Repositories. Gemini AI beantwortet sie basierend auf den verfügbaren Dateien.</p>
       <p>Erstelle eine neue Session, um loszulegen.</p>
       <div class="welcome-files">
         <h3>Verfügbare Dateien:</h3>
@@ -493,38 +493,68 @@ <h3>Verfügbare Dateien:</h3>
   </main>
 
   <script>
-    // --- Storage ---
-    const STORAGE_KEY = 'repo-qa-sessions';
-
-    function loadSessions() {
-      try {
-        return JSON.parse(localStorage.getItem(STORAGE_KEY)) || {};
-      } catch { return {}; }
-    }
-
-    function saveSessions(sessions) {
-      localStorage.setItem(STORAGE_KEY, JSON.stringify(sessions));
-    }
-
-    function getSession(id) {
-      return loadSessions()[id] || null;
-    }
-
-    function saveSession(session) {
-      const sessions = loadSessions();
-      sessions[session.id] = session;
-      saveSessions(sessions);
-    }
-
-    function deleteSession(id) {
-      const sessions = loadSessions();
-      delete sessions[id];
-      saveSessions(sessions);
-      if (currentSessionId === id) {
-        currentSessionId = null;
-        showWelcome();
-      }
-      renderSessionList();
+    // --- IndexedDB Storage ---
+    const DB_NAME = 'repo-qa';
+    const DB_VERSION = 1;
+    const STORE_NAME = 'sessions';
+    let db = null;
+
+    function openDB() {
+      return new Promise((resolve, reject) => {
+        const request = indexedDB.open(DB_NAME, DB_VERSION);
+        request.onupgradeneeded = (e) => {
+          const db = e.target.result;
+          if (!db.objectStoreNames.contains(STORE_NAME)) {
+            const store = db.createObjectStore(STORE_NAME, { keyPath: 'id' });
+            store.createIndex('updatedAt', 'updatedAt', { unique: false });
+          }
+        };
+        request.onsuccess = (e) => {
+          db = e.target.result;
+          resolve(db);
+        };
+        request.onerror = (e) => reject(e.target.error);
+      });
+    }
+
+    function dbGetAll() {
+      return new Promise((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, 'readonly');
+        const store = tx.objectStore(STORE_NAME);
+        const request = store.getAll();
+        request.onsuccess = () => resolve(request.result);
+        request.onerror = (e) => reject(e.target.error);
+      });
+    }
+
+    function dbGet(id) {
+      return new Promise((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, 'readonly');
+        const store = tx.objectStore(STORE_NAME);
+        const request = store.get(id);
+        request.onsuccess = () => resolve(request.result || null);
+        request.onerror = (e) => reject(e.target.error);
+      });
+    }
+
+    function dbPut(session) {
+      return new Promise((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, 'readwrite');
+        const store = tx.objectStore(STORE_NAME);
+        const request = store.put(session);
+        request.onsuccess = () => resolve();
+        request.onerror = (e) => reject(e.target.error);
+      });
+    }
+
+    function dbDelete(id) {
+      return new Promise((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, 'readwrite');
+        const store = tx.objectStore(STORE_NAME);
+        const request = store.delete(id);
+        request.onsuccess = () => resolve();
+        request.onerror = (e) => reject(e.target.error);
+      });
     }
 
     // --- State ---
@@ -533,7 +563,7 @@ <h3>Verfügbare Dateien:</h3>
 
     // --- Session Management ---
 
-    function createNewSession() {
+    async function createNewSession() {
       const id = 'session_' + Date.now() + '_' + Math.random().toString(36).slice(2, 8);
       const session = {
         id,
@@ -542,14 +572,14 @@ <h3>Verfügbare Dateien:</h3>
         createdAt: new Date().toISOString(),
         updatedAt: new Date().toISOString(),
       };
-      saveSession(session);
-      switchToSession(id);
-      renderSessionList();
+      await dbPut(session);
+      await switchToSession(id);
+      await renderSessionList();
       document.getElementById('chatInput').focus();
     }
 
-    function switchToSession(id) {
-      const session = getSession(id);
+    async function switchToSession(id) {
+      const session = await dbGet(id);
       if (!session) return;
 
       currentSessionId = id;
@@ -559,23 +589,32 @@ <h3>Verfügbare Dateien:</h3>
 
       document.getElementById('chatTitle').textContent = session.title;
       renderMessages(session.messages);
-      renderSessionList();
+      await renderSessionList();
       scrollToBottom();
     }
 
-    function showWelcome() {
+    async function showWelcome() {
       currentSessionId = null;
       document.getElementById('welcomeScreen').style.display = 'flex';
       document.getElementById('chatContainer').classList.remove('active');
-      renderSessionList();
+      await renderSessionList();
+    }
+
+    async function deleteSessionById(id) {
+      await dbDelete(id);
+      if (currentSessionId === id) {
+        currentSessionId = null;
+        showWelcome();
+      }
+      await renderSessionList();
     }
 
     // --- Rendering ---
 
-    function renderSessionList() {
-      const sessions = loadSessions();
+    async function renderSessionList() {
+      const sessions = await dbGetAll();
       const list = document.getElementById('sessionList');
-      const sorted = Object.values(sessions).sort((a, b) =>
+      const sorted = sessions.sort((a, b) =>
         new Date(b.updatedAt) - new Date(a.updatedAt)
       );
 
@@ -593,7 +632,7 @@ <h3>Verfügbare Dateien:</h3>
 
     function confirmDelete(id) {
       if (confirm('Session wirklich löschen?')) {
-        deleteSession(id);
+        deleteSessionById(id);
       }
     }
 
@@ -604,9 +643,9 @@ <h3>Verfügbare Dateien:</h3>
 
     function createMessageHtml(msg) {
       const avatar = msg.role === 'user' ? 'Du' : 'AI';
-      const roleLabel = msg.role === 'user' ? 'Du' : 'Claude';
+      const roleLabel = msg.role === 'user' ? 'Du' : 'Gemini';
       const usageHtml = msg.usage
-        ? `<div class="message-usage">Tokens: ${msg.usage.input_tokens} in / ${msg.usage.output_tokens} out</div>`
+        ? `<div class="message-usage">${msg.usage.totalChars} Zeichen generiert</div>`
         : '';
 
       return `
@@ -702,7 +741,7 @@ <h3>Verfügbare Dateien:</h3>
       input.value = '';
       input.style.height = 'auto';
 
-      const session = getSession(currentSessionId);
+      const session = await dbGet(currentSessionId);
       if (!session) return;
 
       // Add user message
@@ -715,9 +754,9 @@ <h3>Verfügbare Dateien:</h3>
         document.getElementById('chatTitle').textContent = session.title;
       }
 
-      saveSession(session);
+      await dbPut(session);
       renderMessages(session.messages);
-      renderSessionList();
+      await renderSessionList();
       scrollToBottom();
 
       // Start streaming response
@@ -730,7 +769,7 @@ <h3>Verfügbare Dateien:</h3>
       assistantMsg.innerHTML = `
         <div class="message-avatar">AI</div>
         <div class="message-content">
-          <div class="message-role">Claude</div>
+          <div class="message-role">Gemini</div>
           <div class="message-text"><span class="streaming-cursor"></span></div>
         </div>
       `;
@@ -794,15 +833,16 @@ <h3>Verfügbare Dateien:</h3>
         if (usage) {
           const usageEl = document.createElement('div');
           usageEl.className = 'message-usage';
-          usageEl.textContent = `Tokens: ${usage.input_tokens} in / ${usage.output_tokens} out`;
+          usageEl.textContent = `${usage.totalChars} Zeichen generiert`;
           assistantMsg.querySelector('.message-content').appendChild(usageEl);
         }
 
         // Save assistant message
-        session.messages.push({ role: 'assistant', content: fullText, usage });
-        session.updatedAt = new Date().toISOString();
-        saveSession(session);
-        renderSessionList();
+        const updatedSession = await dbGet(currentSessionId);
+        updatedSession.messages.push({ role: 'assistant', content: fullText, usage });
+        updatedSession.updatedAt = new Date().toISOString();
+        await dbPut(updatedSession);
+        await renderSessionList();
         setStatus('online');
 
       } catch (err) {
@@ -810,9 +850,12 @@ <h3>Verfügbare Dateien:</h3>
         setStatus('error');
 
         // Save error as message so it's visible when revisiting
-        session.messages.push({ role: 'assistant', content: `Fehler: ${err.message}` });
-        session.updatedAt = new Date().toISOString();
-        saveSession(session);
+        const updatedSession = await dbGet(currentSessionId);
+        if (updatedSession) {
+          updatedSession.messages.push({ role: 'assistant', content: `Fehler: ${err.message}` });
+          updatedSession.updatedAt = new Date().toISOString();
+          await dbPut(updatedSession);
+        }
       }
 
       isStreaming = false;
@@ -857,15 +900,15 @@ <h3>Verfügbare Dateien:</h3>
     });
 
     // Session title editing
-    document.getElementById('chatTitle').addEventListener('blur', (e) => {
+    document.getElementById('chatTitle').addEventListener('blur', async (e) => {
       if (!currentSessionId) return;
-      const session = getSession(currentSessionId);
+      const session = await dbGet(currentSessionId);
       if (!session) return;
       const newTitle = e.target.textContent.trim();
       if (newTitle && newTitle !== session.title) {
         session.title = newTitle;
-        saveSession(session);
-        renderSessionList();
+        await dbPut(session);
+        await renderSessionList();
       }
     });
 
@@ -891,8 +934,9 @@ <h3>Verfügbare Dateien:</h3>
       }
     }
 
-    function init() {
-      renderSessionList();
+    async function init() {
+      await openDB();
+      await renderSessionList();
       loadFiles();
 
       // Check for API health
diff --git a/markdown-qa/server.js b/markdown-qa/server.js
index 908bbea..1059efe 100644
--- a/markdown-qa/server.js
+++ b/markdown-qa/server.js
@@ -1,7 +1,7 @@
 const express = require('express');
 const path = require('path');
 const fs = require('fs');
-const Anthropic = require('@anthropic-ai/sdk');
+const { GoogleGenAI } = require('@google/genai');
 
 const config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), 'utf-8'));
 
@@ -100,15 +100,15 @@ app.post('/api/chat', async (req, res) => {
     }
   }
 
-  const apiKey = process.env.ANTHROPIC_API_KEY;
+  const apiKey = process.env.GEMINI_API_KEY;
   if (!apiKey) {
-    return res.status(500).json({ error: 'ANTHROPIC_API_KEY not configured' });
+    return res.status(500).json({ error: 'GEMINI_API_KEY not configured. Set the GEMINI_API_KEY environment variable.' });
   }
 
-  const client = new Anthropic({ apiKey });
+  const ai = new GoogleGenAI({ apiKey });
   const repoContext = buildRepoContext();
 
-  const systemPrompt = `Du bist ein hilfreicher Assistent, der Fragen zu den Inhalten eines Repositories beantwortet.
+  const systemInstruction = `Du bist ein hilfreicher Assistent, der Fragen zu den Inhalten eines Repositories beantwortet.
 
 Du hast Zugriff auf folgende Dateien aus dem Repository:
 
@@ -124,6 +124,13 @@ Regeln:
 - Du darfst keine externen URLs aufrufen oder Informationen aus externen Quellen verwenden, außer diese sind explizit in der Whitelist: ${JSON.stringify(config.whitelistedUrls)}
 ${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
 
+  // Convert messages from {role, content} to Gemini format {role, parts}
+  // Gemini uses 'user' and 'model' (not 'assistant')
+  const geminiContents = messages.map(m => ({
+    role: m.role === 'assistant' ? 'model' : 'user',
+    parts: [{ text: m.content }],
+  }));
+
   // Set up SSE
   res.writeHead(200, {
     'Content-Type': 'text/event-stream',
@@ -132,25 +139,28 @@ ${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
   });
 
   try {
-    const stream = await client.messages.stream({
-      model: config.claude.model,
-      max_tokens: config.claude.maxTokens,
-      system: systemPrompt,
-      messages: messages.map(m => ({ role: m.role, content: m.content })),
+    const response = await ai.models.generateContentStream({
+      model: config.gemini.model,
+      contents: geminiContents,
+      config: {
+        systemInstruction,
+        maxOutputTokens: config.gemini.maxOutputTokens,
+      },
     });
 
-    for await (const event of stream) {
-      if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
-        res.write(`data: ${JSON.stringify({ type: 'delta', text: event.delta.text })}\n\n`);
+    let totalText = '';
+    for await (const chunk of response) {
+      const text = chunk.text;
+      if (text) {
+        totalText += text;
+        res.write(`data: ${JSON.stringify({ type: 'delta', text })}\n\n`);
       }
     }
 
-    const finalMessage = await stream.finalMessage();
     res.write(`data: ${JSON.stringify({
       type: 'done',
       usage: {
-        input_tokens: finalMessage.usage.input_tokens,
-        output_tokens: finalMessage.usage.output_tokens,
+        totalChars: totalText.length,
       }
     })}\n\n`);
   } catch (err) {

From 2e6ab20856e3b28d2df837c133742f33642ed857 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sat, 14 Feb 2026 09:17:21 +0000
Subject: [PATCH 3/6] Refactor: Web Components, DRY patterns, modern standards

Frontend:
- Web Components: <session-item> and <chat-message> with Shadow DOM
- <template> elements for both components, cloned on instantiation
- SessionStore class: single #exec() method replaces 4 identical wrappers
- QAApp controller class: all state and DOM refs encapsulated via #private
- Event delegation: custom events (session-select, session-delete) bubble
  from components, handled centrally instead of inline onclick handlers
- Markdown renderer: block-aware paragraph wrapping replaces 8 redundant
  regex cleanup passes
- replaceChildren() instead of innerHTML for DOM updates
- Semantic HTML: <section>, <header>, <footer>, hidden attribute
- crypto.randomUUID() for session IDs
- Removed unused CSS variables, deduplicated health check

Backend:
- Cached repo context with 60s TTL (was: full filesystem walk per request)
- Lazy singleton GoogleGenAI instance (was: new per request)
- SKIP_DIRS/ALLOWED_EXTS as Sets (was: duplicated array checks)
- Extracted validateChatBody() for request validation
- Eliminated redundant isAllowedFile double-check in readRepoFile
- getRepoContext() unifies indexing + reading (was: 3 separate functions)

https://claude.ai/code/session_01SDQnB7k2EERPaMDhm6xknd
---
 markdown-qa/public/index.html | 1196 +++++++++++++++------------------
 markdown-qa/server.js         |  168 +++--
 2 files changed, 631 insertions(+), 733 deletions(-)

diff --git a/markdown-qa/public/index.html b/markdown-qa/public/index.html
index fce38b4..dc2f73e 100644
--- a/markdown-qa/public/index.html
+++ b/markdown-qa/public/index.html
@@ -11,9 +11,6 @@
       --sidebar-text: #e0e0e0;
       --sidebar-hover: #16213e;
       --sidebar-active: #0f3460;
-      --chat-bg: #ffffff;
-      --user-msg: #e3f2fd;
-      --assistant-msg: #f5f5f5;
       --primary: #1565c0;
       --primary-hover: #0d47a1;
       --text: #212121;
@@ -51,16 +48,8 @@
       border-bottom: 1px solid rgba(255,255,255,0.1);
     }
 
-    .sidebar-header h1 {
-      font-size: 18px;
-      font-weight: 600;
-      margin-bottom: 4px;
-    }
-
-    .sidebar-header p {
-      font-size: 12px;
-      opacity: 0.6;
-    }
+    .sidebar-header h1 { font-size: 18px; font-weight: 600; margin-bottom: 4px; }
+    .sidebar-header p { font-size: 12px; opacity: 0.6; }
 
     .new-session-btn {
       margin: 16px 20px;
@@ -83,55 +72,6 @@
       padding: 8px;
     }
 
-    .session-item {
-      padding: 12px;
-      border-radius: 8px;
-      cursor: pointer;
-      margin-bottom: 4px;
-      transition: background 0.15s;
-      display: flex;
-      justify-content: space-between;
-      align-items: flex-start;
-    }
-
-    .session-item:hover { background: var(--sidebar-hover); }
-    .session-item.active { background: var(--sidebar-active); }
-
-    .session-item-info {
-      flex: 1;
-      min-width: 0;
-    }
-
-    .session-item-title {
-      font-size: 14px;
-      font-weight: 500;
-      white-space: nowrap;
-      overflow: hidden;
-      text-overflow: ellipsis;
-    }
-
-    .session-item-date {
-      font-size: 11px;
-      opacity: 0.5;
-      margin-top: 2px;
-    }
-
-    .session-item-delete {
-      opacity: 0;
-      background: none;
-      border: none;
-      color: var(--sidebar-text);
-      cursor: pointer;
-      padding: 4px;
-      font-size: 16px;
-      line-height: 1;
-      border-radius: 4px;
-      transition: opacity 0.15s, color 0.15s;
-    }
-
-    .session-item:hover .session-item-delete { opacity: 0.6; }
-    .session-item-delete:hover { opacity: 1 !important; color: var(--danger); }
-
     .sidebar-footer {
       padding: 16px 20px;
       border-top: 1px solid rgba(255,255,255,0.1);
@@ -159,18 +99,9 @@
       text-align: center;
     }
 
-    .welcome h2 {
-      font-size: 28px;
-      font-weight: 600;
-      margin-bottom: 12px;
-    }
-
-    .welcome p {
-      color: var(--text-light);
-      max-width: 500px;
-      line-height: 1.6;
-      margin-bottom: 8px;
-    }
+    .welcome[hidden] { display: none; }
+    .welcome h2 { font-size: 28px; font-weight: 600; margin-bottom: 12px; }
+    .welcome p { color: var(--text-light); max-width: 500px; line-height: 1.6; margin-bottom: 8px; }
 
     .welcome-files {
       margin-top: 24px;
@@ -183,32 +114,19 @@
       width: 100%;
     }
 
-    .welcome-files h3 {
-      font-size: 14px;
-      margin-bottom: 12px;
-      color: var(--text-light);
-    }
-
-    .welcome-files ul {
-      list-style: none;
-      font-size: 13px;
-      font-family: var(--mono);
-    }
-
-    .welcome-files li {
-      padding: 4px 0;
-      color: var(--primary);
-    }
+    .welcome-files h3 { font-size: 14px; margin-bottom: 12px; color: var(--text-light); }
+    .welcome-files ul { list-style: none; font-size: 13px; font-family: var(--mono); }
+    .welcome-files li { padding: 4px 0; color: var(--primary); }
 
     /* Chat area */
     .chat-container {
       flex: 1;
-      display: none;
+      display: flex;
       flex-direction: column;
       height: 100vh;
     }
 
-    .chat-container.active { display: flex; }
+    .chat-container[hidden] { display: none; }
 
     .chat-header {
       padding: 16px 24px;
@@ -219,171 +137,18 @@
       gap: 12px;
     }
 
-    .chat-header-title {
-      font-size: 16px;
-      font-weight: 600;
-      flex: 1;
-    }
-
+    .chat-header-title { font-size: 16px; font-weight: 600; flex: 1; }
     .chat-header-title[contenteditable]:focus {
       outline: 2px solid var(--primary);
       outline-offset: 2px;
       border-radius: 4px;
     }
 
-    .status-indicator {
-      width: 8px;
-      height: 8px;
-      border-radius: 50%;
-      background: #4caf50;
-    }
-
+    .status-indicator { width: 8px; height: 8px; border-radius: 50%; background: #4caf50; }
     .status-indicator.offline { background: #ff9800; }
     .status-indicator.error { background: var(--danger); }
 
-    .chat-messages {
-      flex: 1;
-      overflow-y: auto;
-      padding: 24px;
-    }
-
-    .message {
-      max-width: 800px;
-      margin: 0 auto 20px;
-      display: flex;
-      gap: 12px;
-    }
-
-    .message-avatar {
-      width: 32px;
-      height: 32px;
-      border-radius: 50%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      font-size: 14px;
-      font-weight: 600;
-      flex-shrink: 0;
-    }
-
-    .message.user .message-avatar {
-      background: var(--primary);
-      color: white;
-    }
-
-    .message.assistant .message-avatar {
-      background: #7c4dff;
-      color: white;
-    }
-
-    .message-content {
-      flex: 1;
-      min-width: 0;
-    }
-
-    .message-role {
-      font-size: 12px;
-      font-weight: 600;
-      margin-bottom: 4px;
-      text-transform: uppercase;
-      letter-spacing: 0.5px;
-      color: var(--text-light);
-    }
-
-    .message-text {
-      font-size: 15px;
-      line-height: 1.7;
-      word-wrap: break-word;
-    }
-
-    .message-text p { margin-bottom: 12px; }
-    .message-text p:last-child { margin-bottom: 0; }
-
-    .message-text pre {
-      background: #1e1e1e;
-      color: #d4d4d4;
-      padding: 16px;
-      border-radius: 8px;
-      overflow-x: auto;
-      margin: 12px 0;
-      font-family: var(--mono);
-      font-size: 13px;
-      line-height: 1.5;
-    }
-
-    .message-text code {
-      background: #f0f0f0;
-      padding: 2px 6px;
-      border-radius: 4px;
-      font-family: var(--mono);
-      font-size: 13px;
-    }
-
-    .message-text pre code {
-      background: none;
-      padding: 0;
-    }
-
-    .message-text ul, .message-text ol {
-      margin: 8px 0 8px 20px;
-    }
-
-    .message-text li { margin-bottom: 4px; }
-
-    .message-text strong { font-weight: 600; }
-
-    .message-text blockquote {
-      border-left: 3px solid var(--primary);
-      padding-left: 16px;
-      margin: 12px 0;
-      color: var(--text-light);
-    }
-
-    .message-text h1, .message-text h2, .message-text h3 {
-      margin: 16px 0 8px;
-    }
-
-    .message-text h1 { font-size: 20px; }
-    .message-text h2 { font-size: 18px; }
-    .message-text h3 { font-size: 16px; }
-
-    .message-text table {
-      border-collapse: collapse;
-      margin: 12px 0;
-      width: 100%;
-    }
-
-    .message-text th, .message-text td {
-      border: 1px solid var(--border);
-      padding: 8px 12px;
-      text-align: left;
-    }
-
-    .message-text th {
-      background: var(--bg);
-      font-weight: 600;
-    }
-
-    .streaming-cursor {
-      display: inline-block;
-      width: 8px;
-      height: 18px;
-      background: var(--primary);
-      animation: blink 1s infinite;
-      vertical-align: text-bottom;
-      margin-left: 2px;
-    }
-
-    @keyframes blink {
-      0%, 50% { opacity: 1; }
-      51%, 100% { opacity: 0; }
-    }
-
-    .message-usage {
-      font-size: 11px;
-      color: var(--text-light);
-      margin-top: 8px;
-    }
+    .chat-messages { flex: 1; overflow-y: auto; padding: 24px; }
 
     /* Input area */
     .chat-input-area {
@@ -416,11 +181,7 @@
     }
 
     .chat-input:focus { border-color: var(--primary); }
-
-    .chat-input:disabled {
-      background: var(--bg);
-      cursor: not-allowed;
-    }
+    .chat-input:disabled { background: var(--bg); cursor: not-allowed; }
 
     .send-btn {
       padding: 12px 20px;
@@ -442,11 +203,9 @@
     @media (max-width: 768px) {
       .sidebar { width: 60px; min-width: 60px; }
       .sidebar-header h1, .sidebar-header p,
-      .session-item-info, .sidebar-footer,
+      .sidebar-footer,
       .new-session-btn span { display: none; }
       .new-session-btn { margin: 12px 8px; padding: 10px; text-align: center; }
-      .session-item { padding: 8px; justify-content: center; }
-      .session-item-delete { display: none; }
       .chat-messages { padding: 16px; }
       .chat-input-area { padding: 12px; }
     }
@@ -454,20 +213,166 @@
 </head>
 <body>
 
+  <!-- ========== Templates ========== -->
+
+  <template id="tmpl-session-item">
+    <style>
+      :host {
+        display: flex;
+        padding: 12px;
+        border-radius: 8px;
+        cursor: pointer;
+        margin-bottom: 4px;
+        transition: background 0.15s;
+        align-items: flex-start;
+      }
+      :host(:hover) { background: var(--sidebar-hover); }
+      :host([active]) { background: var(--sidebar-active); }
+      .info { flex: 1; min-width: 0; }
+      .title {
+        font-size: 14px;
+        font-weight: 500;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        color: var(--sidebar-text);
+      }
+      .meta {
+        font-size: 11px;
+        opacity: 0.5;
+        margin-top: 2px;
+        color: var(--sidebar-text);
+      }
+      button {
+        opacity: 0;
+        background: none;
+        border: none;
+        color: var(--sidebar-text);
+        cursor: pointer;
+        padding: 4px;
+        font-size: 16px;
+        line-height: 1;
+        border-radius: 4px;
+        transition: opacity 0.15s, color 0.15s;
+      }
+      :host(:hover) button { opacity: 0.6; }
+      button:hover { opacity: 1 !important; color: var(--danger); }
+    </style>
+    <div class="info">
+      <div class="title"></div>
+      <div class="meta"></div>
+    </div>
+    <button title="Löschen">&times;</button>
+  </template>
+
+  <template id="tmpl-chat-message">
+    <style>
+      :host {
+        display: flex;
+        max-width: 800px;
+        margin: 0 auto 20px;
+        gap: 12px;
+      }
+      .avatar {
+        width: 32px;
+        height: 32px;
+        border-radius: 50%;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 14px;
+        font-weight: 600;
+        flex-shrink: 0;
+        color: white;
+      }
+      :host([role="user"]) .avatar { background: var(--primary); }
+      :host([role="assistant"]) .avatar { background: #7c4dff; }
+      .content { flex: 1; min-width: 0; }
+      .role {
+        font-size: 12px;
+        font-weight: 600;
+        margin-bottom: 4px;
+        text-transform: uppercase;
+        letter-spacing: 0.5px;
+        color: var(--text-light);
+      }
+      .text { font-size: 15px; line-height: 1.7; word-wrap: break-word; }
+      .text p { margin-bottom: 12px; }
+      .text p:last-child { margin-bottom: 0; }
+      .text pre {
+        background: #1e1e1e;
+        color: #d4d4d4;
+        padding: 16px;
+        border-radius: 8px;
+        overflow-x: auto;
+        margin: 12px 0;
+        font-family: var(--mono);
+        font-size: 13px;
+        line-height: 1.5;
+      }
+      .text code {
+        background: #f0f0f0;
+        padding: 2px 6px;
+        border-radius: 4px;
+        font-family: var(--mono);
+        font-size: 13px;
+      }
+      .text pre code { background: none; padding: 0; }
+      .text ul, .text ol { margin: 8px 0 8px 20px; }
+      .text li { margin-bottom: 4px; }
+      .text strong { font-weight: 600; }
+      .text blockquote {
+        border-left: 3px solid var(--primary);
+        padding-left: 16px;
+        margin: 12px 0;
+        color: var(--text-light);
+      }
+      .text h1, .text h2, .text h3 { margin: 16px 0 8px; }
+      .text h1 { font-size: 20px; }
+      .text h2 { font-size: 18px; }
+      .text h3 { font-size: 16px; }
+      .text table { border-collapse: collapse; margin: 12px 0; width: 100%; }
+      .text th, .text td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
+      .text th { background: var(--bg); font-weight: 600; }
+      .usage { font-size: 11px; color: var(--text-light); margin-top: 8px; }
+      .cursor {
+        display: inline-block;
+        width: 8px;
+        height: 18px;
+        background: var(--primary);
+        animation: blink 1s infinite;
+        vertical-align: text-bottom;
+        margin-left: 2px;
+      }
+      @keyframes blink {
+        0%, 50% { opacity: 1; }
+        51%, 100% { opacity: 0; }
+      }
+    </style>
+    <div class="avatar"></div>
+    <div class="content">
+      <div class="role"></div>
+      <div class="text"></div>
+      <div class="usage"></div>
+    </div>
+  </template>
+
+  <!-- ========== App Shell ========== -->
+
   <aside class="sidebar">
     <div class="sidebar-header">
       <h1>Repo Q&A</h1>
       <p>Fragen zum Repository</p>
     </div>
-    <button class="new-session-btn" onclick="createNewSession()">
+    <button class="new-session-btn" id="newSessionBtn">
       + <span>Neue Session</span>
     </button>
     <div class="session-list" id="sessionList"></div>
-    <div class="sidebar-footer">Local-first &middot; Sessions in IndexedDB gespeichert</div>
+    <div class="sidebar-footer">Local-first &middot; Sessions in IndexedDB</div>
   </aside>
 
   <main class="main">
-    <div class="welcome" id="welcomeScreen">
+    <section class="welcome" id="welcomeScreen">
       <h2>Repository Q&A</h2>
       <p>Stelle Fragen zu den Inhalten dieses Repositories. Gemini AI beantwortet sie basierend auf den verfügbaren Dateien.</p>
       <p>Erstelle eine neue Session, um loszulegen.</p>
@@ -475,478 +380,483 @@ <h2>Repository Q&A</h2>
         <h3>Verfügbare Dateien:</h3>
         <ul id="fileList"><li>Lade...</li></ul>
       </div>
-    </div>
+    </section>
 
-    <div class="chat-container" id="chatContainer">
-      <div class="chat-header">
+    <section class="chat-container" id="chatContainer" hidden>
+      <header class="chat-header">
         <div class="status-indicator" id="statusIndicator"></div>
         <div class="chat-header-title" id="chatTitle" contenteditable="true" spellcheck="false"></div>
-      </div>
+      </header>
       <div class="chat-messages" id="chatMessages"></div>
-      <div class="chat-input-area">
+      <footer class="chat-input-area">
         <div class="chat-input-wrapper">
           <textarea class="chat-input" id="chatInput" placeholder="Stelle eine Frage zum Repository..." rows="1"></textarea>
-          <button class="send-btn" id="sendBtn" onclick="sendMessage()">Senden</button>
+          <button class="send-btn" id="sendBtn">Senden</button>
         </div>
-      </div>
-    </div>
+      </footer>
+    </section>
   </main>
 
   <script>
-    // --- IndexedDB Storage ---
-    const DB_NAME = 'repo-qa';
-    const DB_VERSION = 1;
-    const STORE_NAME = 'sessions';
-    let db = null;
-
-    function openDB() {
-      return new Promise((resolve, reject) => {
-        const request = indexedDB.open(DB_NAME, DB_VERSION);
-        request.onupgradeneeded = (e) => {
-          const db = e.target.result;
-          if (!db.objectStoreNames.contains(STORE_NAME)) {
-            const store = db.createObjectStore(STORE_NAME, { keyPath: 'id' });
-            store.createIndex('updatedAt', 'updatedAt', { unique: false });
-          }
-        };
-        request.onsuccess = (e) => {
-          db = e.target.result;
-          resolve(db);
-        };
-        request.onerror = (e) => reject(e.target.error);
-      });
-    }
+    // ========== IndexedDB Store ==========
+
+    class SessionStore {
+      #db = null;
+
+      async open() {
+        this.#db = await new Promise((resolve, reject) => {
+          const req = indexedDB.open('repo-qa', 1);
+          req.onupgradeneeded = () => {
+            const db = req.result;
+            if (!db.objectStoreNames.contains('sessions')) {
+              db.createObjectStore('sessions', { keyPath: 'id' })
+                .createIndex('updatedAt', 'updatedAt');
+            }
+          };
+          req.onsuccess = () => resolve(req.result);
+          req.onerror = () => reject(req.error);
+        });
+      }
 
-    function dbGetAll() {
-      return new Promise((resolve, reject) => {
-        const tx = db.transaction(STORE_NAME, 'readonly');
-        const store = tx.objectStore(STORE_NAME);
-        const request = store.getAll();
-        request.onsuccess = () => resolve(request.result);
-        request.onerror = (e) => reject(e.target.error);
-      });
-    }
+      #exec(mode, fn) {
+        return new Promise((resolve, reject) => {
+          const store = this.#db.transaction('sessions', mode).objectStore('sessions');
+          const req = fn(store);
+          req.onsuccess = () => resolve(req.result ?? null);
+          req.onerror = () => reject(req.error);
+        });
+      }
 
-    function dbGet(id) {
-      return new Promise((resolve, reject) => {
-        const tx = db.transaction(STORE_NAME, 'readonly');
-        const store = tx.objectStore(STORE_NAME);
-        const request = store.get(id);
-        request.onsuccess = () => resolve(request.result || null);
-        request.onerror = (e) => reject(e.target.error);
-      });
+      getAll()  { return this.#exec('readonly', s => s.getAll()); }
+      get(id)   { return this.#exec('readonly', s => s.get(id)); }
+      put(data) { return this.#exec('readwrite', s => s.put(data)); }
+      delete(id){ return this.#exec('readwrite', s => s.delete(id)); }
     }
 
-    function dbPut(session) {
-      return new Promise((resolve, reject) => {
-        const tx = db.transaction(STORE_NAME, 'readwrite');
-        const store = tx.objectStore(STORE_NAME);
-        const request = store.put(session);
-        request.onsuccess = () => resolve();
-        request.onerror = (e) => reject(e.target.error);
-      });
-    }
+    // ========== Markdown Renderer ==========
 
-    function dbDelete(id) {
-      return new Promise((resolve, reject) => {
-        const tx = db.transaction(STORE_NAME, 'readwrite');
-        const store = tx.objectStore(STORE_NAME);
-        const request = store.delete(id);
-        request.onsuccess = () => resolve();
-        request.onerror = (e) => reject(e.target.error);
-      });
-    }
+    const MD = {
+      BLOCK_TAGS: new Set(['h1','h2','h3','pre','ul','ol','blockquote']),
 
-    // --- State ---
-    let currentSessionId = null;
-    let isStreaming = false;
+      escapeHtml(text) {
+        return text.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
+      },
 
-    // --- Session Management ---
+      render(text) {
+        if (!text) return '';
+        let html = this.escapeHtml(text);
 
-    async function createNewSession() {
-      const id = 'session_' + Date.now() + '_' + Math.random().toString(36).slice(2, 8);
-      const session = {
-        id,
-        title: 'Neue Session',
-        messages: [],
-        createdAt: new Date().toISOString(),
-        updatedAt: new Date().toISOString(),
-      };
-      await dbPut(session);
-      await switchToSession(id);
-      await renderSessionList();
-      document.getElementById('chatInput').focus();
-    }
+        // Fenced code blocks
+        html = html.replace(/```(\w*)\n([\s\S]*?)```/g, (_, lang, code) =>
+          `<pre><code class="language-${lang}">${code.trim()}</code></pre>`);
 
-    async function switchToSession(id) {
-      const session = await dbGet(id);
-      if (!session) return;
+        // Inline code (must come after fenced blocks)
+        html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
 
-      currentSessionId = id;
-      document.getElementById('welcomeScreen').style.display = 'none';
-      const chat = document.getElementById('chatContainer');
-      chat.classList.add('active');
+        // Bold before italic
+        html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
+        html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
 
-      document.getElementById('chatTitle').textContent = session.title;
-      renderMessages(session.messages);
-      await renderSessionList();
-      scrollToBottom();
-    }
+        // Headings
+        html = html.replace(/^### (.+)$/gm, '<h3>$1</h3>');
+        html = html.replace(/^## (.+)$/gm, '<h2>$1</h2>');
+        html = html.replace(/^# (.+)$/gm, '<h1>$1</h1>');
 
-    async function showWelcome() {
-      currentSessionId = null;
-      document.getElementById('welcomeScreen').style.display = 'flex';
-      document.getElementById('chatContainer').classList.remove('active');
-      await renderSessionList();
-    }
+        // Blockquotes
+        html = html.replace(/^&gt; (.+)$/gm, '<blockquote>$1</blockquote>');
+
+        // Lists
+        html = html.replace(/^[-*] (.+)$/gm, '<li>$1</li>');
+        html = html.replace(/((?:<li>.*<\/li>\n?)+)/g, '<ul>$1</ul>');
+        html = html.replace(/^\d+\. (.+)$/gm, '<li>$1</li>');
 
-    async function deleteSessionById(id) {
-      await dbDelete(id);
-      if (currentSessionId === id) {
-        currentSessionId = null;
-        showWelcome();
+        // Paragraphs: wrap remaining text blocks
+        html = html.split(/\n{2,}/).map(block => {
+          const trimmed = block.trim();
+          if (!trimmed) return '';
+          // Don't wrap blocks that already start with a block-level tag
+          const match = trimmed.match(/^<(\w+)/);
+          if (match && this.BLOCK_TAGS.has(match[1])) return trimmed;
+          return `<p>${trimmed}</p>`;
+        }).join('\n');
+
+        return html;
       }
-      await renderSessionList();
-    }
+    };
 
-    // --- Rendering ---
-
-    async function renderSessionList() {
-      const sessions = await dbGetAll();
-      const list = document.getElementById('sessionList');
-      const sorted = sessions.sort((a, b) =>
-        new Date(b.updatedAt) - new Date(a.updatedAt)
-      );
-
-      list.innerHTML = sorted.map(s => `
-        <div class="session-item ${s.id === currentSessionId ? 'active' : ''}"
-             onclick="switchToSession('${s.id}')">
-          <div class="session-item-info">
-            <div class="session-item-title">${escapeHtml(s.title)}</div>
-            <div class="session-item-date">${formatDate(s.updatedAt)} &middot; ${s.messages.length} Nachrichten</div>
-          </div>
-          <button class="session-item-delete" onclick="event.stopPropagation(); confirmDelete('${s.id}')" title="Löschen">&times;</button>
-        </div>
-      `).join('');
+    // ========== Relative Date Formatter ==========
+
+    function formatDate(iso) {
+      const ms = Date.now() - new Date(iso);
+      if (ms < 60_000) return 'Gerade eben';
+      if (ms < 3_600_000) return `vor ${Math.floor(ms / 60_000)} Min.`;
+      if (ms < 86_400_000) return `vor ${Math.floor(ms / 3_600_000)} Std.`;
+      return new Date(iso).toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' });
     }
 
-    function confirmDelete(id) {
-      if (confirm('Session wirklich löschen?')) {
-        deleteSessionById(id);
+    // ========== Web Components ==========
+
+    class SessionItem extends HTMLElement {
+      static observedAttributes = ['active'];
+
+      #data = null;
+
+      constructor() {
+        super();
+        this.attachShadow({ mode: 'open' });
+        this.shadowRoot.append(
+          document.getElementById('tmpl-session-item').content.cloneNode(true)
+        );
       }
-    }
 
-    function renderMessages(messages) {
-      const container = document.getElementById('chatMessages');
-      container.innerHTML = messages.map(m => createMessageHtml(m)).join('');
-    }
+      connectedCallback() {
+        this.addEventListener('click', () =>
+          this.dispatchEvent(new CustomEvent('session-select', { detail: this.#data.id, bubbles: true }))
+        );
+        this.shadowRoot.querySelector('button').addEventListener('click', (e) => {
+          e.stopPropagation();
+          if (confirm('Session wirklich löschen?')) {
+            this.dispatchEvent(new CustomEvent('session-delete', { detail: this.#data.id, bubbles: true }));
+          }
+        });
+      }
 
-    function createMessageHtml(msg) {
-      const avatar = msg.role === 'user' ? 'Du' : 'AI';
-      const roleLabel = msg.role === 'user' ? 'Du' : 'Gemini';
-      const usageHtml = msg.usage
-        ? `<div class="message-usage">${msg.usage.totalChars} Zeichen generiert</div>`
-        : '';
-
-      return `
-        <div class="message ${msg.role}">
-          <div class="message-avatar">${avatar}</div>
-          <div class="message-content">
-            <div class="message-role">${roleLabel}</div>
-            <div class="message-text">${renderMarkdown(msg.content)}</div>
-            ${usageHtml}
-          </div>
-        </div>
-      `;
+      set data(session) {
+        this.#data = session;
+        this.shadowRoot.querySelector('.title').textContent = session.title;
+        this.shadowRoot.querySelector('.meta').textContent =
+          `${formatDate(session.updatedAt)} · ${session.messages.length} Nachrichten`;
+      }
+
+      attributeChangedCallback(name) {
+        // Attribute reflection handled by CSS :host([active])
+      }
     }
 
-    // --- Markdown rendering (lightweight) ---
+    class ChatMessage extends HTMLElement {
+      static ROLE_MAP = { user: { avatar: 'Du', label: 'Du' }, assistant: { avatar: 'AI', label: 'Gemini' } };
+
+      constructor() {
+        super();
+        this.attachShadow({ mode: 'open' });
+        this.shadowRoot.append(
+          document.getElementById('tmpl-chat-message').content.cloneNode(true)
+        );
+        this.#els = {
+          avatar: this.shadowRoot.querySelector('.avatar'),
+          role: this.shadowRoot.querySelector('.role'),
+          text: this.shadowRoot.querySelector('.text'),
+          usage: this.shadowRoot.querySelector('.usage'),
+        };
+      }
 
-    function renderMarkdown(text) {
-      if (!text) return '';
-      let html = escapeHtml(text);
+      #els;
 
-      // Code blocks
-      html = html.replace(/```(\w*)\n([\s\S]*?)```/g, (_, lang, code) =>
-        `<pre><code class="language-${lang}">${code.trim()}</code></pre>`
-      );
+      set data({ role, content, usage }) {
+        this.setAttribute('role', role);
+        const meta = ChatMessage.ROLE_MAP[role];
+        this.#els.avatar.textContent = meta.avatar;
+        this.#els.role.textContent = meta.label;
+        this.setContent(content);
+        this.setUsage(usage);
+      }
 
-      // Inline code
-      html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
+      setContent(text) {
+        this.#els.text.innerHTML = text ? MD.render(text) : '';
+      }
 
-      // Bold
-      html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
+      appendDelta(text) {
+        // Used during streaming - re-render full accumulated text
+        this.#els.text.innerHTML = MD.render(text) + '<span class="cursor"></span>';
+      }
 
-      // Italic
-      html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
+      showCursor() {
+        this.#els.text.innerHTML = '<span class="cursor"></span>';
+      }
 
-      // Headers
-      html = html.replace(/^### (.+)$/gm, '<h3>$1</h3>');
-      html = html.replace(/^## (.+)$/gm, '<h2>$1</h2>');
-      html = html.replace(/^# (.+)$/gm, '<h1>$1</h1>');
+      setUsage(usage) {
+        this.#els.usage.textContent = usage?.totalChars ? `${usage.totalChars} Zeichen generiert` : '';
+      }
+
+      setError(message) {
+        this.#els.text.innerHTML = `<p style="color: var(--danger)">${MD.escapeHtml(message)}</p>`;
+      }
+    }
 
-      // Blockquotes
-      html = html.replace(/^&gt; (.+)$/gm, '<blockquote>$1</blockquote>');
+    customElements.define('session-item', SessionItem);
+    customElements.define('chat-message', ChatMessage);
 
-      // Unordered lists
-      html = html.replace(/^[-*] (.+)$/gm, '<li>$1</li>');
-      html = html.replace(/(<li>.*<\/li>\n?)+/g, match => `<ul>${match}</ul>`);
+    // ========== App Controller ==========
 
-      // Ordered lists
-      html = html.replace(/^\d+\. (.+)$/gm, '<li>$1</li>');
+    class QAApp {
+      #store = new SessionStore();
+      #currentId = null;
+      #streaming = false;
 
-      // Line breaks into paragraphs
-      html = html.replace(/\n\n/g, '</p><p>');
-      html = '<p>' + html + '</p>';
+      // Cached DOM refs
+      #el = {
+        welcome:    document.getElementById('welcomeScreen'),
+        chat:       document.getElementById('chatContainer'),
+        messages:   document.getElementById('chatMessages'),
+        title:      document.getElementById('chatTitle'),
+        input:      document.getElementById('chatInput'),
+        sendBtn:    document.getElementById('sendBtn'),
+        status:     document.getElementById('statusIndicator'),
+        sessionList:document.getElementById('sessionList'),
+        fileList:   document.getElementById('fileList'),
+      };
 
-      // Clean up empty paragraphs
-      html = html.replace(/<p>\s*<\/p>/g, '');
-      html = html.replace(/<p>(<h[123]>)/g, '$1');
-      html = html.replace(/(<\/h[123]>)<\/p>/g, '$1');
-      html = html.replace(/<p>(<pre>)/g, '$1');
-      html = html.replace(/(<\/pre>)<\/p>/g, '$1');
-      html = html.replace(/<p>(<ul>)/g, '$1');
-      html = html.replace(/(<\/ul>)<\/p>/g, '$1');
-      html = html.replace(/<p>(<blockquote>)/g, '$1');
-      html = html.replace(/(<\/blockquote>)<\/p>/g, '$1');
+      async init() {
+        await this.#store.open();
+        this.#bindEvents();
+        await this.#renderSessionList();
+        this.#loadFiles();
+      }
 
-      return html;
-    }
+      #bindEvents() {
+        document.getElementById('newSessionBtn').addEventListener('click', () => this.#createSession());
 
-    function escapeHtml(text) {
-      const div = document.createElement('div');
-      div.textContent = text;
-      return div.innerHTML;
-    }
+        this.#el.sendBtn.addEventListener('click', () => this.#sendMessage());
 
-    function formatDate(iso) {
-      const d = new Date(iso);
-      const now = new Date();
-      const diff = now - d;
-      if (diff < 60000) return 'Gerade eben';
-      if (diff < 3600000) return `vor ${Math.floor(diff / 60000)} Min.`;
-      if (diff < 86400000) return `vor ${Math.floor(diff / 3600000)} Std.`;
-      return d.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' });
-    }
+        this.#el.input.addEventListener('keydown', (e) => {
+          if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); this.#sendMessage(); }
+        });
 
-    // --- Chat ---
+        this.#el.input.addEventListener('input', () => {
+          this.#el.input.style.height = 'auto';
+          this.#el.input.style.height = Math.min(this.#el.input.scrollHeight, 200) + 'px';
+        });
 
-    async function sendMessage() {
-      if (isStreaming || !currentSessionId) return;
+        this.#el.title.addEventListener('blur', () => this.#saveTitle());
+        this.#el.title.addEventListener('keydown', (e) => {
+          if (e.key === 'Enter') { e.preventDefault(); this.#el.title.blur(); }
+        });
 
-      const input = document.getElementById('chatInput');
-      const text = input.value.trim();
-      if (!text) return;
+        // Event delegation for session items
+        this.#el.sessionList.addEventListener('session-select', (e) => this.#switchToSession(e.detail));
+        this.#el.sessionList.addEventListener('session-delete', (e) => this.#deleteSession(e.detail));
+      }
+
+      // --- Session CRUD ---
+
+      async #createSession() {
+        const session = {
+          id: `s_${Date.now()}_${crypto.randomUUID().slice(0, 6)}`,
+          title: 'Neue Session',
+          messages: [],
+          createdAt: new Date().toISOString(),
+          updatedAt: new Date().toISOString(),
+        };
+        await this.#store.put(session);
+        await this.#switchToSession(session.id);
+        this.#el.input.focus();
+      }
 
-      input.value = '';
-      input.style.height = 'auto';
+      async #switchToSession(id) {
+        const session = await this.#store.get(id);
+        if (!session) return;
+        this.#currentId = id;
+        this.#el.welcome.hidden = true;
+        this.#el.chat.hidden = false;
+        this.#el.title.textContent = session.title;
+        this.#renderMessages(session.messages);
+        await this.#renderSessionList();
+        this.#scrollToBottom();
+      }
 
-      const session = await dbGet(currentSessionId);
-      if (!session) return;
+      async #deleteSession(id) {
+        await this.#store.delete(id);
+        if (this.#currentId === id) this.#showWelcome();
+        await this.#renderSessionList();
+      }
 
-      // Add user message
-      session.messages.push({ role: 'user', content: text });
-      session.updatedAt = new Date().toISOString();
+      #showWelcome() {
+        this.#currentId = null;
+        this.#el.welcome.hidden = false;
+        this.#el.chat.hidden = true;
+      }
 
-      // Auto-title on first message
-      if (session.messages.length === 1) {
-        session.title = text.length > 60 ? text.slice(0, 57) + '...' : text;
-        document.getElementById('chatTitle').textContent = session.title;
+      async #saveTitle() {
+        if (!this.#currentId) return;
+        const session = await this.#store.get(this.#currentId);
+        if (!session) return;
+        const newTitle = this.#el.title.textContent.trim();
+        if (newTitle && newTitle !== session.title) {
+          session.title = newTitle;
+          await this.#store.put(session);
+          await this.#renderSessionList();
+        }
       }
 
-      await dbPut(session);
-      renderMessages(session.messages);
-      await renderSessionList();
-      scrollToBottom();
+      // --- Rendering ---
 
-      // Start streaming response
-      isStreaming = true;
-      updateUI();
+      async #renderSessionList() {
+        const sessions = await this.#store.getAll();
+        sessions.sort((a, b) => new Date(b.updatedAt) - new Date(a.updatedAt));
 
-      const messagesDiv = document.getElementById('chatMessages');
-      const assistantMsg = document.createElement('div');
-      assistantMsg.className = 'message assistant';
-      assistantMsg.innerHTML = `
-        <div class="message-avatar">AI</div>
-        <div class="message-content">
-          <div class="message-role">Gemini</div>
-          <div class="message-text"><span class="streaming-cursor"></span></div>
-        </div>
-      `;
-      messagesDiv.appendChild(assistantMsg);
-      scrollToBottom();
-
-      const textEl = assistantMsg.querySelector('.message-text');
-      let fullText = '';
-
-      try {
-        setStatus('streaming');
-
-        const response = await fetch('/api/chat', {
-          method: 'POST',
-          headers: { 'Content-Type': 'application/json' },
-          body: JSON.stringify({
-            messages: session.messages.map(m => ({ role: m.role, content: m.content })),
-            sessionContext: session.title,
-          }),
-        });
+        this.#el.sessionList.replaceChildren(
+          ...sessions.map(s => {
+            const el = document.createElement('session-item');
+            el.data = s;
+            if (s.id === this.#currentId) el.setAttribute('active', '');
+            return el;
+          })
+        );
+      }
+
+      #renderMessages(messages) {
+        this.#el.messages.replaceChildren(
+          ...messages.map(m => {
+            const el = document.createElement('chat-message');
+            el.data = m;
+            return el;
+          })
+        );
+      }
+
+      // --- Chat / Streaming ---
+
+      async #sendMessage() {
+        if (this.#streaming || !this.#currentId) return;
+        const text = this.#el.input.value.trim();
+        if (!text) return;
+
+        this.#el.input.value = '';
+        this.#el.input.style.height = 'auto';
+
+        const session = await this.#store.get(this.#currentId);
+        if (!session) return;
 
-        if (!response.ok) {
-          const err = await response.json();
-          throw new Error(err.error || 'API request failed');
+        session.messages.push({ role: 'user', content: text });
+        session.updatedAt = new Date().toISOString();
+
+        if (session.messages.length === 1) {
+          session.title = text.length > 60 ? text.slice(0, 57) + '...' : text;
+          this.#el.title.textContent = session.title;
         }
 
-        const reader = response.body.getReader();
-        const decoder = new TextDecoder();
-        let buffer = '';
-        let usage = null;
+        await this.#store.put(session);
+        this.#renderMessages(session.messages);
+        await this.#renderSessionList();
+        this.#scrollToBottom();
+
+        // Create streaming placeholder
+        this.#streaming = true;
+        this.#updateInputState();
+
+        const msgEl = document.createElement('chat-message');
+        msgEl.setAttribute('role', 'assistant');
+        msgEl.data = { role: 'assistant', content: '' };
+        msgEl.showCursor();
+        this.#el.messages.appendChild(msgEl);
+        this.#scrollToBottom();
+
+        let fullText = '';
+
+        try {
+          this.#setStatus('streaming');
+
+          const response = await fetch('/api/chat', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({
+              messages: session.messages.map(({ role, content }) => ({ role, content })),
+              sessionContext: session.title,
+            }),
+          });
+
+          if (!response.ok) {
+            const err = await response.json();
+            throw new Error(err.error || 'API request failed');
+          }
+
+          const reader = response.body.getReader();
+          const decoder = new TextDecoder();
+          let buffer = '';
+          let usage = null;
 
-        while (true) {
-          const { done, value } = await reader.read();
-          if (done) break;
+          while (true) {
+            const { done, value } = await reader.read();
+            if (done) break;
 
-          buffer += decoder.decode(value, { stream: true });
-          const lines = buffer.split('\n');
-          buffer = lines.pop();
+            buffer += decoder.decode(value, { stream: true });
+            const lines = buffer.split('\n');
+            buffer = lines.pop();
 
-          for (const line of lines) {
-            if (!line.startsWith('data: ')) continue;
-            try {
+            for (const line of lines) {
+              if (!line.startsWith('data: ')) continue;
               const data = JSON.parse(line.slice(6));
               if (data.type === 'delta') {
                 fullText += data.text;
-                textEl.innerHTML = renderMarkdown(fullText) + '<span class="streaming-cursor"></span>';
-                scrollToBottom();
+                msgEl.appendDelta(fullText);
+                this.#scrollToBottom();
               } else if (data.type === 'done') {
                 usage = data.usage;
               } else if (data.type === 'error') {
                 throw new Error(data.error);
               }
-            } catch (e) {
-              if (e.message !== 'Unexpected end of JSON input') throw e;
             }
           }
-        }
 
-        // Finalize
-        textEl.innerHTML = renderMarkdown(fullText);
-        if (usage) {
-          const usageEl = document.createElement('div');
-          usageEl.className = 'message-usage';
-          usageEl.textContent = `${usage.totalChars} Zeichen generiert`;
-          assistantMsg.querySelector('.message-content').appendChild(usageEl);
+          msgEl.setContent(fullText);
+          msgEl.setUsage(usage);
+
+          const updated = await this.#store.get(this.#currentId);
+          updated.messages.push({ role: 'assistant', content: fullText, usage });
+          updated.updatedAt = new Date().toISOString();
+          await this.#store.put(updated);
+          await this.#renderSessionList();
+          this.#setStatus('online');
+
+        } catch (err) {
+          msgEl.setError(`Fehler: ${err.message}`);
+          this.#setStatus('error');
+
+          const updated = await this.#store.get(this.#currentId);
+          if (updated) {
+            updated.messages.push({ role: 'assistant', content: `Fehler: ${err.message}` });
+            updated.updatedAt = new Date().toISOString();
+            await this.#store.put(updated);
+          }
         }
 
-        // Save assistant message
-        const updatedSession = await dbGet(currentSessionId);
-        updatedSession.messages.push({ role: 'assistant', content: fullText, usage });
-        updatedSession.updatedAt = new Date().toISOString();
-        await dbPut(updatedSession);
-        await renderSessionList();
-        setStatus('online');
-
-      } catch (err) {
-        textEl.innerHTML = `<p style="color: var(--danger)">Fehler: ${escapeHtml(err.message)}</p>`;
-        setStatus('error');
-
-        // Save error as message so it's visible when revisiting
-        const updatedSession = await dbGet(currentSessionId);
-        if (updatedSession) {
-          updatedSession.messages.push({ role: 'assistant', content: `Fehler: ${err.message}` });
-          updatedSession.updatedAt = new Date().toISOString();
-          await dbPut(updatedSession);
-        }
+        this.#streaming = false;
+        this.#updateInputState();
+        this.#scrollToBottom();
       }
 
-      isStreaming = false;
-      updateUI();
-      scrollToBottom();
-    }
-
-    function updateUI() {
-      const input = document.getElementById('chatInput');
-      const btn = document.getElementById('sendBtn');
-      input.disabled = isStreaming;
-      btn.disabled = isStreaming;
-      btn.textContent = isStreaming ? 'Läuft...' : 'Senden';
-    }
-
-    function setStatus(state) {
-      const el = document.getElementById('statusIndicator');
-      el.className = 'status-indicator';
-      if (state === 'offline') el.classList.add('offline');
-      if (state === 'error') el.classList.add('error');
-    }
-
-    function scrollToBottom() {
-      const el = document.getElementById('chatMessages');
-      requestAnimationFrame(() => { el.scrollTop = el.scrollHeight; });
-    }
-
-    // --- Input handling ---
+      // --- UI helpers ---
 
-    const chatInput = document.getElementById('chatInput');
-
-    chatInput.addEventListener('keydown', (e) => {
-      if (e.key === 'Enter' && !e.shiftKey) {
-        e.preventDefault();
-        sendMessage();
+      #updateInputState() {
+        this.#el.input.disabled = this.#streaming;
+        this.#el.sendBtn.disabled = this.#streaming;
+        this.#el.sendBtn.textContent = this.#streaming ? 'Läuft...' : 'Senden';
       }
-    });
-
-    chatInput.addEventListener('input', () => {
-      chatInput.style.height = 'auto';
-      chatInput.style.height = Math.min(chatInput.scrollHeight, 200) + 'px';
-    });
 
-    // Session title editing
-    document.getElementById('chatTitle').addEventListener('blur', async (e) => {
-      if (!currentSessionId) return;
-      const session = await dbGet(currentSessionId);
-      if (!session) return;
-      const newTitle = e.target.textContent.trim();
-      if (newTitle && newTitle !== session.title) {
-        session.title = newTitle;
-        await dbPut(session);
-        await renderSessionList();
+      #setStatus(state) {
+        this.#el.status.className = 'status-indicator' + (state === 'offline' ? ' offline' : state === 'error' ? ' error' : '');
       }
-    });
 
-    document.getElementById('chatTitle').addEventListener('keydown', (e) => {
-      if (e.key === 'Enter') {
-        e.preventDefault();
-        e.target.blur();
+      #scrollToBottom() {
+        requestAnimationFrame(() => { this.#el.messages.scrollTop = this.#el.messages.scrollHeight; });
       }
-    });
 
-    // --- Init ---
-
-    async function loadFiles() {
-      try {
-        const res = await fetch('/api/files');
-        const data = await res.json();
-        const ul = document.getElementById('fileList');
-        ul.innerHTML = data.files.map(f => `<li>${escapeHtml(f.path)}</li>`).join('');
-        setStatus('online');
-      } catch {
-        document.getElementById('fileList').innerHTML = '<li>Offline - keine Verbindung zum Server</li>';
-        setStatus('offline');
+      async #loadFiles() {
+        try {
+          const { files } = await (await fetch('/api/files')).json();
+          this.#el.fileList.replaceChildren(
+            ...files.map(f => { const li = document.createElement('li'); li.textContent = f.path; return li; })
+          );
+          this.#setStatus('online');
+        } catch {
+          this.#el.fileList.innerHTML = '<li>Offline - keine Verbindung zum Server</li>';
+          this.#setStatus('offline');
+        }
       }
     }
 
-    async function init() {
-      await openDB();
-      await renderSessionList();
-      loadFiles();
-
-      // Check for API health
-      fetch('/api/health')
-        .then(r => r.json())
-        .then(() => setStatus('online'))
-        .catch(() => setStatus('offline'));
-    }
-
-    init();
+    // ========== Boot ==========
+    new QAApp().init();
   </script>
 
 </body>
diff --git a/markdown-qa/server.js b/markdown-qa/server.js
index 1059efe..a06a418 100644
--- a/markdown-qa/server.js
+++ b/markdown-qa/server.js
@@ -5,108 +5,113 @@ const { GoogleGenAI } = require('@google/genai');
 
 const config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), 'utf-8'));
 
-const app = express();
-app.use(express.json());
-app.use(express.static(path.join(__dirname, 'public')));
-
 const REPO_ROOT = path.resolve(__dirname, config.repoRoot);
+const SKIP_DIRS = new Set(['.git', 'node_modules', 'markdown-qa']);
+const ALLOWED_EXTS = new Set(config.allowedFileExtensions);
+const VALID_ROLES = new Set(['user', 'assistant']);
+const CONTEXT_CACHE_TTL = 60_000;
 
 // --- Restrictive file access ---
 
-function isAllowedFile(filePath) {
-  const resolved = path.resolve(REPO_ROOT, filePath);
-  if (!resolved.startsWith(REPO_ROOT)) return false;
-  const ext = path.extname(resolved).toLowerCase();
-  if (!config.allowedFileExtensions.includes(ext)) return false;
-  if (resolved.includes('node_modules')) return false;
-  if (resolved.includes('.git')) return false;
-  return true;
+function isAllowedPath(relPath) {
+  const resolved = path.resolve(REPO_ROOT, relPath);
+  if (!resolved.startsWith(REPO_ROOT + path.sep) && resolved !== REPO_ROOT) return false;
+  if (resolved.split(path.sep).some(seg => SKIP_DIRS.has(seg))) return false;
+  return ALLOWED_EXTS.has(path.extname(resolved).toLowerCase());
 }
 
 function indexRepoFiles() {
   const files = [];
-  function walk(dir) {
+  const walk = (dir) => {
     let entries;
     try { entries = fs.readdirSync(dir, { withFileTypes: true }); }
     catch { return; }
     for (const entry of entries) {
+      if (entry.name.startsWith('.') || SKIP_DIRS.has(entry.name)) continue;
       const full = path.join(dir, entry.name);
-      if (entry.name.startsWith('.')) continue;
-      if (entry.name === 'node_modules') continue;
-      if (entry.name === 'markdown-qa') continue;
       if (entry.isDirectory()) {
         walk(full);
       } else {
         const rel = path.relative(REPO_ROOT, full);
-        if (isAllowedFile(rel)) {
-          const stat = fs.statSync(full);
-          if (stat.size <= config.maxFileSizeBytes) {
-            files.push({ path: rel, size: stat.size });
-          }
-        }
+        if (!isAllowedPath(rel)) continue;
+        try {
+          const { size } = fs.statSync(full);
+          if (size <= config.maxFileSizeBytes) files.push({ path: rel, size });
+        } catch { /* skip unreadable */ }
       }
     }
-  }
+  };
   walk(REPO_ROOT);
   return files;
 }
 
-function readRepoFile(relPath) {
-  if (!isAllowedFile(relPath)) return null;
-  const full = path.resolve(REPO_ROOT, relPath);
-  try {
-    const content = fs.readFileSync(full, 'utf-8');
-    return content;
-  } catch {
-    return null;
-  }
-}
+// --- Cached repo context ---
+
+let contextCache = { text: '', files: [], timestamp: 0 };
+
+function getRepoContext() {
+  if (Date.now() - contextCache.timestamp < CONTEXT_CACHE_TTL) return contextCache;
 
-function buildRepoContext() {
   const files = indexRepoFiles();
-  const parts = [];
-  for (const file of files) {
-    const content = readRepoFile(file.path);
-    if (content) {
-      parts.push(`--- File: ${file.path} ---\n${content}\n`);
-    }
+  const text = files
+    .map(f => {
+      try { return `--- File: ${f.path} ---\n${fs.readFileSync(path.resolve(REPO_ROOT, f.path), 'utf-8')}\n`; }
+      catch { return null; }
+    })
+    .filter(Boolean)
+    .join('\n');
+
+  contextCache = { text, files, timestamp: Date.now() };
+  return contextCache;
+}
+
+// --- Lazy Gemini client ---
+
+let ai = null;
+function getAI() {
+  if (ai) return ai;
+  const apiKey = process.env.GEMINI_API_KEY;
+  if (!apiKey) throw new Error('GEMINI_API_KEY not configured. Set the GEMINI_API_KEY environment variable.');
+  ai = new GoogleGenAI({ apiKey });
+  return ai;
+}
+
+// --- Validation ---
+
+function validateChatBody(body) {
+  const { messages } = body;
+  if (!Array.isArray(messages) || messages.length === 0) return 'messages array is required';
+  for (const msg of messages) {
+    if (typeof msg.content !== 'string') return 'Only text messages are allowed';
+    if (!VALID_ROLES.has(msg.role)) return 'Invalid message role';
   }
-  return parts.join('\n');
+  return null;
 }
 
-// --- API Routes ---
+// --- Express app ---
+
+const app = express();
+app.use(express.json());
+app.use(express.static(path.join(__dirname, 'public')));
 
-// List available repo files
 app.get('/api/files', (_req, res) => {
-  const files = indexRepoFiles();
-  res.json({ files });
+  res.json({ files: getRepoContext().files });
 });
 
-// Chat endpoint with streaming (SSE)
-app.post('/api/chat', async (req, res) => {
-  const { messages, sessionContext } = req.body;
-
-  if (!messages || !Array.isArray(messages) || messages.length === 0) {
-    return res.status(400).json({ error: 'messages array is required' });
-  }
+app.get('/api/health', (_req, res) => {
+  res.json({ status: 'ok', files: getRepoContext().files.length });
+});
 
-  // Validate messages contain only text
-  for (const msg of messages) {
-    if (typeof msg.content !== 'string') {
-      return res.status(400).json({ error: 'Only text messages are allowed' });
-    }
-    if (!['user', 'assistant'].includes(msg.role)) {
-      return res.status(400).json({ error: 'Invalid message role' });
-    }
-  }
+app.post('/api/chat', async (req, res) => {
+  const error = validateChatBody(req.body);
+  if (error) return res.status(400).json({ error });
 
-  const apiKey = process.env.GEMINI_API_KEY;
-  if (!apiKey) {
-    return res.status(500).json({ error: 'GEMINI_API_KEY not configured. Set the GEMINI_API_KEY environment variable.' });
-  }
+  let client;
+  try { client = getAI(); }
+  catch (err) { return res.status(500).json({ error: err.message }); }
 
-  const ai = new GoogleGenAI({ apiKey });
-  const repoContext = buildRepoContext();
+  const { messages, sessionContext } = req.body;
+  const { text: repoContext } = getRepoContext();
 
   const systemInstruction = `Du bist ein hilfreicher Assistent, der Fragen zu den Inhalten eines Repositories beantwortet.
 
@@ -124,14 +129,11 @@ Regeln:
 - Du darfst keine externen URLs aufrufen oder Informationen aus externen Quellen verwenden, außer diese sind explizit in der Whitelist: ${JSON.stringify(config.whitelistedUrls)}
 ${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
 
-  // Convert messages from {role, content} to Gemini format {role, parts}
-  // Gemini uses 'user' and 'model' (not 'assistant')
   const geminiContents = messages.map(m => ({
     role: m.role === 'assistant' ? 'model' : 'user',
     parts: [{ text: m.content }],
   }));
 
-  // Set up SSE
   res.writeHead(200, {
     'Content-Type': 'text/event-stream',
     'Cache-Control': 'no-cache',
@@ -139,30 +141,22 @@ ${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
   });
 
   try {
-    const response = await ai.models.generateContentStream({
+    const response = await client.models.generateContentStream({
       model: config.gemini.model,
       contents: geminiContents,
-      config: {
-        systemInstruction,
-        maxOutputTokens: config.gemini.maxOutputTokens,
-      },
+      config: { systemInstruction, maxOutputTokens: config.gemini.maxOutputTokens },
     });
 
-    let totalText = '';
+    let totalChars = 0;
     for await (const chunk of response) {
       const text = chunk.text;
       if (text) {
-        totalText += text;
+        totalChars += text.length;
         res.write(`data: ${JSON.stringify({ type: 'delta', text })}\n\n`);
       }
     }
 
-    res.write(`data: ${JSON.stringify({
-      type: 'done',
-      usage: {
-        totalChars: totalText.length,
-      }
-    })}\n\n`);
+    res.write(`data: ${JSON.stringify({ type: 'done', usage: { totalChars } })}\n\n`);
   } catch (err) {
     res.write(`data: ${JSON.stringify({ type: 'error', error: err.message })}\n\n`);
   }
@@ -170,19 +164,13 @@ ${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
   res.end();
 });
 
-// Health check
-app.get('/api/health', (_req, res) => {
-  res.json({ status: 'ok', files: indexRepoFiles().length });
-});
-
-// Serve frontend for all other routes
 app.get('*', (_req, res) => {
   res.sendFile(path.join(__dirname, 'public', 'index.html'));
 });
 
 const PORT = config.port;
 app.listen(PORT, () => {
-  const files = indexRepoFiles();
+  const { files } = getRepoContext();
   console.log(`Markdown QA Server running on http://localhost:${PORT}`);
   console.log(`Repository root: ${REPO_ROOT}`);
   console.log(`Indexed ${files.length} files: ${files.map(f => f.path).join(', ')}`);

From 663febbadaf4e5fb015df3ff222a0710f03cc55e Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sat, 14 Feb 2026 10:38:07 +0000
Subject: [PATCH 4/6] Replace Gemini SDK with CLI backend, add session context
 editor

Architecture change: the server no longer reads repo files or calls the
Gemini SDK directly. Instead it spawns a configurable CLI (claude, gemini,
aider, etc.) per request and streams stdout back as SSE. The CLI handles
its own file discovery via grep/find/read tools.

Server (server.js):
- Removed @google/genai, file indexing, context building (~100 lines gone)
- Now just Express + child_process.spawn + SSE piping (~100 lines total)
- buildPrompt() assembles session context + conversation history + question
- Aborts CLI process on client disconnect
- Configurable via config.json cli.command/args/env

Frontend (index.html):
- Added collapsible "Kontext" panel in chat header
- Session context persisted per session in IndexedDB
- Context sent with every message to the CLI backend
- Removed file listing (CLI discovers files itself)
- Generic "Assistent" label instead of "Gemini"
- Welcome screen simplified (no file list needed)

Config:
- Replaced gemini section with cli { command, args, env }
- Removed allowedFileExtensions, maxFileSizeBytes, whitelistedUrls

https://claude.ai/code/session_01SDQnB7k2EERPaMDhm6xknd
---
 markdown-qa/config.json       |  10 +-
 markdown-qa/package.json      |   3 +-
 markdown-qa/public/index.html | 172 ++++++++++++++++++++---------
 markdown-qa/server.js         | 198 +++++++++++-----------------------
 4 files changed, 189 insertions(+), 194 deletions(-)

diff --git a/markdown-qa/config.json b/markdown-qa/config.json
index 059c83b..d32b289 100644
--- a/markdown-qa/config.json
+++ b/markdown-qa/config.json
@@ -1,11 +1,9 @@
 {
   "port": 3000,
   "repoRoot": "..",
-  "allowedFileExtensions": [".md", ".html", ".txt"],
-  "maxFileSizeBytes": 102400,
-  "whitelistedUrls": [],
-  "gemini": {
-    "model": "gemini-2.5-flash",
-    "maxOutputTokens": 4096
+  "cli": {
+    "command": "claude",
+    "args": ["--print", "--verbose"],
+    "env": {}
   }
 }
diff --git a/markdown-qa/package.json b/markdown-qa/package.json
index 316302a..ddd71da 100644
--- a/markdown-qa/package.json
+++ b/markdown-qa/package.json
@@ -1,14 +1,13 @@
 {
   "name": "markdown-qa",
   "version": "1.0.0",
-  "description": "Local-first QA app for repository content powered by Gemini AI",
+  "description": "Local-first QA app for repository content, powered by any CLI backend",
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
     "dev": "node server.js"
   },
   "dependencies": {
-    "@google/genai": "^1.41.0",
     "express": "^4.21.0"
   }
 }
diff --git a/markdown-qa/public/index.html b/markdown-qa/public/index.html
index dc2f73e..40ff8ab 100644
--- a/markdown-qa/public/index.html
+++ b/markdown-qa/public/index.html
@@ -103,21 +103,6 @@
     .welcome h2 { font-size: 28px; font-weight: 600; margin-bottom: 12px; }
     .welcome p { color: var(--text-light); max-width: 500px; line-height: 1.6; margin-bottom: 8px; }
 
-    .welcome-files {
-      margin-top: 24px;
-      text-align: left;
-      background: white;
-      border: 1px solid var(--border);
-      border-radius: 12px;
-      padding: 20px;
-      max-width: 500px;
-      width: 100%;
-    }
-
-    .welcome-files h3 { font-size: 14px; margin-bottom: 12px; color: var(--text-light); }
-    .welcome-files ul { list-style: none; font-size: 13px; font-family: var(--mono); }
-    .welcome-files li { padding: 4px 0; color: var(--primary); }
-
     /* Chat area */
     .chat-container {
       flex: 1;
@@ -144,10 +129,68 @@
       border-radius: 4px;
     }
 
+    .context-toggle {
+      padding: 6px 12px;
+      background: none;
+      border: 1px solid var(--border);
+      border-radius: 6px;
+      cursor: pointer;
+      font-size: 12px;
+      font-family: var(--font);
+      color: var(--text-light);
+      transition: all 0.2s;
+    }
+
+    .context-toggle:hover { border-color: var(--primary); color: var(--primary); }
+    .context-toggle[aria-expanded="true"] { background: var(--primary); color: white; border-color: var(--primary); }
+
     .status-indicator { width: 8px; height: 8px; border-radius: 50%; background: #4caf50; }
     .status-indicator.offline { background: #ff9800; }
     .status-indicator.error { background: var(--danger); }
 
+    /* Context panel */
+    .context-panel {
+      background: #fafafa;
+      border-bottom: 1px solid var(--border);
+      padding: 16px 24px;
+      display: none;
+    }
+
+    .context-panel.open { display: block; }
+
+    .context-panel label {
+      display: block;
+      font-size: 12px;
+      font-weight: 600;
+      color: var(--text-light);
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+      margin-bottom: 8px;
+    }
+
+    .context-textarea {
+      width: 100%;
+      max-width: 800px;
+      min-height: 80px;
+      padding: 12px;
+      border: 1px solid var(--border);
+      border-radius: 8px;
+      font-size: 13px;
+      font-family: var(--font);
+      line-height: 1.5;
+      resize: vertical;
+      outline: none;
+      transition: border-color 0.2s;
+    }
+
+    .context-textarea:focus { border-color: var(--primary); }
+
+    .context-hint {
+      font-size: 11px;
+      color: var(--text-light);
+      margin-top: 6px;
+    }
+
     .chat-messages { flex: 1; overflow-y: auto; padding: 24px; }
 
     /* Input area */
@@ -362,7 +405,7 @@
   <aside class="sidebar">
     <div class="sidebar-header">
       <h1>Repo Q&A</h1>
-      <p>Fragen zum Repository</p>
+      <p>CLI-powered</p>
     </div>
     <button class="new-session-btn" id="newSessionBtn">
       + <span>Neue Session</span>
@@ -374,19 +417,22 @@ <h1>Repo Q&A</h1>
   <main class="main">
     <section class="welcome" id="welcomeScreen">
       <h2>Repository Q&A</h2>
-      <p>Stelle Fragen zu den Inhalten dieses Repositories. Gemini AI beantwortet sie basierend auf den verfügbaren Dateien.</p>
+      <p>Stelle Fragen zu den Inhalten dieses Repositories. Die CLI durchsucht die Dateien automatisch und beantwortet deine Fragen.</p>
       <p>Erstelle eine neue Session, um loszulegen.</p>
-      <div class="welcome-files">
-        <h3>Verfügbare Dateien:</h3>
-        <ul id="fileList"><li>Lade...</li></ul>
-      </div>
     </section>
 
     <section class="chat-container" id="chatContainer" hidden>
       <header class="chat-header">
         <div class="status-indicator" id="statusIndicator"></div>
         <div class="chat-header-title" id="chatTitle" contenteditable="true" spellcheck="false"></div>
+        <button class="context-toggle" id="contextToggle" aria-expanded="false">Kontext</button>
       </header>
+      <div class="context-panel" id="contextPanel">
+        <label for="contextInput">Session-Kontext</label>
+        <textarea class="context-textarea" id="contextInput"
+          placeholder="Zusätzlicher Kontext für diese Session, z.B.:&#10;- Antworte immer auf Deutsch&#10;- Fokus auf die HTML-Dateien&#10;- Erkläre Code für Anfänger"></textarea>
+        <div class="context-hint">Wird bei jeder Nachricht mitgesendet. Änderungen werden automatisch gespeichert.</div>
+      </div>
       <div class="chat-messages" id="chatMessages"></div>
       <footer class="chat-input-area">
         <div class="chat-input-wrapper">
@@ -405,7 +451,7 @@ <h3>Verfügbare Dateien:</h3>
 
       async open() {
         this.#db = await new Promise((resolve, reject) => {
-          const req = indexedDB.open('repo-qa', 1);
+          const req = indexedDB.open('repo-qa', 2);
           req.onupgradeneeded = () => {
             const db = req.result;
             if (!db.objectStoreNames.contains('sessions')) {
@@ -450,7 +496,7 @@ <h3>Verfügbare Dateien:</h3>
         html = html.replace(/```(\w*)\n([\s\S]*?)```/g, (_, lang, code) =>
           `<pre><code class="language-${lang}">${code.trim()}</code></pre>`);
 
-        // Inline code (must come after fenced blocks)
+        // Inline code
         html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
 
         // Bold before italic
@@ -470,11 +516,10 @@ <h3>Verfügbare Dateien:</h3>
         html = html.replace(/((?:<li>.*<\/li>\n?)+)/g, '<ul>$1</ul>');
         html = html.replace(/^\d+\. (.+)$/gm, '<li>$1</li>');
 
-        // Paragraphs: wrap remaining text blocks
+        // Paragraphs
         html = html.split(/\n{2,}/).map(block => {
           const trimmed = block.trim();
           if (!trimmed) return '';
-          // Don't wrap blocks that already start with a block-level tag
           const match = trimmed.match(/^<(\w+)/);
           if (match && this.BLOCK_TAGS.has(match[1])) return trimmed;
           return `<p>${trimmed}</p>`;
@@ -524,17 +569,16 @@ <h3>Verfügbare Dateien:</h3>
       set data(session) {
         this.#data = session;
         this.shadowRoot.querySelector('.title').textContent = session.title;
+        const ctx = session.context ? ' · ctx' : '';
         this.shadowRoot.querySelector('.meta').textContent =
-          `${formatDate(session.updatedAt)} · ${session.messages.length} Nachrichten`;
+          `${formatDate(session.updatedAt)} · ${session.messages.length} Nachr.${ctx}`;
       }
 
-      attributeChangedCallback(name) {
-        // Attribute reflection handled by CSS :host([active])
-      }
+      attributeChangedCallback() {}
     }
 
     class ChatMessage extends HTMLElement {
-      static ROLE_MAP = { user: { avatar: 'Du', label: 'Du' }, assistant: { avatar: 'AI', label: 'Gemini' } };
+      static ROLE_MAP = { user: { avatar: 'Du', label: 'Du' }, assistant: { avatar: 'AI', label: 'Assistent' } };
 
       constructor() {
         super();
@@ -566,7 +610,6 @@ <h3>Verfügbare Dateien:</h3>
       }
 
       appendDelta(text) {
-        // Used during streaming - re-render full accumulated text
         this.#els.text.innerHTML = MD.render(text) + '<span class="cursor"></span>';
       }
 
@@ -575,7 +618,7 @@ <h3>Verfügbare Dateien:</h3>
       }
 
       setUsage(usage) {
-        this.#els.usage.textContent = usage?.totalChars ? `${usage.totalChars} Zeichen generiert` : '';
+        this.#els.usage.textContent = usage?.totalChars ? `${usage.totalChars} Zeichen` : '';
       }
 
       setError(message) {
@@ -593,24 +636,25 @@ <h3>Verfügbare Dateien:</h3>
       #currentId = null;
       #streaming = false;
 
-      // Cached DOM refs
       #el = {
-        welcome:    document.getElementById('welcomeScreen'),
-        chat:       document.getElementById('chatContainer'),
-        messages:   document.getElementById('chatMessages'),
-        title:      document.getElementById('chatTitle'),
-        input:      document.getElementById('chatInput'),
-        sendBtn:    document.getElementById('sendBtn'),
-        status:     document.getElementById('statusIndicator'),
-        sessionList:document.getElementById('sessionList'),
-        fileList:   document.getElementById('fileList'),
+        welcome:      document.getElementById('welcomeScreen'),
+        chat:         document.getElementById('chatContainer'),
+        messages:     document.getElementById('chatMessages'),
+        title:        document.getElementById('chatTitle'),
+        input:        document.getElementById('chatInput'),
+        sendBtn:      document.getElementById('sendBtn'),
+        status:       document.getElementById('statusIndicator'),
+        sessionList:  document.getElementById('sessionList'),
+        contextToggle:document.getElementById('contextToggle'),
+        contextPanel: document.getElementById('contextPanel'),
+        contextInput: document.getElementById('contextInput'),
       };
 
       async init() {
         await this.#store.open();
         this.#bindEvents();
         await this.#renderSessionList();
-        this.#loadFiles();
+        this.#checkHealth();
       }
 
       #bindEvents() {
@@ -632,17 +676,43 @@ <h3>Verfügbare Dateien:</h3>
           if (e.key === 'Enter') { e.preventDefault(); this.#el.title.blur(); }
         });
 
+        // Context panel
+        this.#el.contextToggle.addEventListener('click', () => this.#toggleContext());
+        this.#el.contextInput.addEventListener('blur', () => this.#saveContext());
+
         // Event delegation for session items
         this.#el.sessionList.addEventListener('session-select', (e) => this.#switchToSession(e.detail));
         this.#el.sessionList.addEventListener('session-delete', (e) => this.#deleteSession(e.detail));
       }
 
+      // --- Context ---
+
+      #toggleContext() {
+        const open = this.#el.contextPanel.classList.toggle('open');
+        this.#el.contextToggle.setAttribute('aria-expanded', open);
+        if (open) this.#el.contextInput.focus();
+      }
+
+      async #saveContext() {
+        if (!this.#currentId) return;
+        const session = await this.#store.get(this.#currentId);
+        if (!session) return;
+        const ctx = this.#el.contextInput.value.trim();
+        if (ctx !== (session.context ?? '')) {
+          session.context = ctx;
+          session.updatedAt = new Date().toISOString();
+          await this.#store.put(session);
+          await this.#renderSessionList();
+        }
+      }
+
       // --- Session CRUD ---
 
       async #createSession() {
         const session = {
           id: `s_${Date.now()}_${crypto.randomUUID().slice(0, 6)}`,
           title: 'Neue Session',
+          context: '',
           messages: [],
           createdAt: new Date().toISOString(),
           updatedAt: new Date().toISOString(),
@@ -659,6 +729,7 @@ <h3>Verfügbare Dateien:</h3>
         this.#el.welcome.hidden = true;
         this.#el.chat.hidden = false;
         this.#el.title.textContent = session.title;
+        this.#el.contextInput.value = session.context ?? '';
         this.#renderMessages(session.messages);
         await this.#renderSessionList();
         this.#scrollToBottom();
@@ -674,6 +745,9 @@ <h3>Verfügbare Dateien:</h3>
         this.#currentId = null;
         this.#el.welcome.hidden = false;
         this.#el.chat.hidden = true;
+        // Close context panel when leaving
+        this.#el.contextPanel.classList.remove('open');
+        this.#el.contextToggle.setAttribute('aria-expanded', 'false');
       }
 
       async #saveTitle() {
@@ -761,7 +835,7 @@ <h3>Verfügbare Dateien:</h3>
             headers: { 'Content-Type': 'application/json' },
             body: JSON.stringify({
               messages: session.messages.map(({ role, content }) => ({ role, content })),
-              sessionContext: session.title,
+              sessionContext: (session.context ?? '').trim() || undefined,
             }),
           });
 
@@ -841,15 +915,11 @@ <h3>Verfügbare Dateien:</h3>
         requestAnimationFrame(() => { this.#el.messages.scrollTop = this.#el.messages.scrollHeight; });
       }
 
-      async #loadFiles() {
+      async #checkHealth() {
         try {
-          const { files } = await (await fetch('/api/files')).json();
-          this.#el.fileList.replaceChildren(
-            ...files.map(f => { const li = document.createElement('li'); li.textContent = f.path; return li; })
-          );
-          this.#setStatus('online');
+          const { status } = await (await fetch('/api/health')).json();
+          this.#setStatus(status === 'ok' ? 'online' : 'error');
         } catch {
-          this.#el.fileList.innerHTML = '<li>Offline - keine Verbindung zum Server</li>';
           this.#setStatus('offline');
         }
       }
diff --git a/markdown-qa/server.js b/markdown-qa/server.js
index a06a418..63740b4 100644
--- a/markdown-qa/server.js
+++ b/markdown-qa/server.js
@@ -1,138 +1,51 @@
 const express = require('express');
 const path = require('path');
 const fs = require('fs');
-const { GoogleGenAI } = require('@google/genai');
+const { spawn } = require('child_process');
 
 const config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), 'utf-8'));
 
 const REPO_ROOT = path.resolve(__dirname, config.repoRoot);
-const SKIP_DIRS = new Set(['.git', 'node_modules', 'markdown-qa']);
-const ALLOWED_EXTS = new Set(config.allowedFileExtensions);
-const VALID_ROLES = new Set(['user', 'assistant']);
-const CONTEXT_CACHE_TTL = 60_000;
-
-// --- Restrictive file access ---
-
-function isAllowedPath(relPath) {
-  const resolved = path.resolve(REPO_ROOT, relPath);
-  if (!resolved.startsWith(REPO_ROOT + path.sep) && resolved !== REPO_ROOT) return false;
-  if (resolved.split(path.sep).some(seg => SKIP_DIRS.has(seg))) return false;
-  return ALLOWED_EXTS.has(path.extname(resolved).toLowerCase());
-}
-
-function indexRepoFiles() {
-  const files = [];
-  const walk = (dir) => {
-    let entries;
-    try { entries = fs.readdirSync(dir, { withFileTypes: true }); }
-    catch { return; }
-    for (const entry of entries) {
-      if (entry.name.startsWith('.') || SKIP_DIRS.has(entry.name)) continue;
-      const full = path.join(dir, entry.name);
-      if (entry.isDirectory()) {
-        walk(full);
-      } else {
-        const rel = path.relative(REPO_ROOT, full);
-        if (!isAllowedPath(rel)) continue;
-        try {
-          const { size } = fs.statSync(full);
-          if (size <= config.maxFileSizeBytes) files.push({ path: rel, size });
-        } catch { /* skip unreadable */ }
-      }
-    }
-  };
-  walk(REPO_ROOT);
-  return files;
-}
-
-// --- Cached repo context ---
-
-let contextCache = { text: '', files: [], timestamp: 0 };
-
-function getRepoContext() {
-  if (Date.now() - contextCache.timestamp < CONTEXT_CACHE_TTL) return contextCache;
-
-  const files = indexRepoFiles();
-  const text = files
-    .map(f => {
-      try { return `--- File: ${f.path} ---\n${fs.readFileSync(path.resolve(REPO_ROOT, f.path), 'utf-8')}\n`; }
-      catch { return null; }
-    })
-    .filter(Boolean)
-    .join('\n');
-
-  contextCache = { text, files, timestamp: Date.now() };
-  return contextCache;
-}
-
-// --- Lazy Gemini client ---
-
-let ai = null;
-function getAI() {
-  if (ai) return ai;
-  const apiKey = process.env.GEMINI_API_KEY;
-  if (!apiKey) throw new Error('GEMINI_API_KEY not configured. Set the GEMINI_API_KEY environment variable.');
-  ai = new GoogleGenAI({ apiKey });
-  return ai;
-}
-
-// --- Validation ---
-
-function validateChatBody(body) {
-  const { messages } = body;
-  if (!Array.isArray(messages) || messages.length === 0) return 'messages array is required';
-  for (const msg of messages) {
-    if (typeof msg.content !== 'string') return 'Only text messages are allowed';
-    if (!VALID_ROLES.has(msg.role)) return 'Invalid message role';
-  }
-  return null;
-}
-
-// --- Express app ---
 
 const app = express();
 app.use(express.json());
 app.use(express.static(path.join(__dirname, 'public')));
 
-app.get('/api/files', (_req, res) => {
-  res.json({ files: getRepoContext().files });
-});
+// --- Build prompt from conversation history + context ---
 
-app.get('/api/health', (_req, res) => {
-  res.json({ status: 'ok', files: getRepoContext().files.length });
-});
+function buildPrompt(messages, sessionContext) {
+  const parts = [];
 
-app.post('/api/chat', async (req, res) => {
-  const error = validateChatBody(req.body);
-  if (error) return res.status(400).json({ error });
+  if (sessionContext) {
+    parts.push(`[Session context]\n${sessionContext}\n`);
+  }
 
-  let client;
-  try { client = getAI(); }
-  catch (err) { return res.status(500).json({ error: err.message }); }
+  // Include prior conversation for multi-turn continuity
+  if (messages.length > 1) {
+    const history = messages.slice(0, -1).map(m =>
+      `[${m.role === 'user' ? 'User' : 'Assistant'}]\n${m.content}`
+    ).join('\n\n');
+    parts.push(`[Conversation so far]\n${history}\n`);
+  }
 
-  const { messages, sessionContext } = req.body;
-  const { text: repoContext } = getRepoContext();
+  // Current question is always last
+  const last = messages[messages.length - 1];
+  parts.push(last.content);
 
-  const systemInstruction = `Du bist ein hilfreicher Assistent, der Fragen zu den Inhalten eines Repositories beantwortet.
+  return parts.join('\n\n');
+}
 
-Du hast Zugriff auf folgende Dateien aus dem Repository:
+// --- Spawn CLI and stream output as SSE ---
 
-<repository-content>
-${repoContext}
-</repository-content>
+app.post('/api/chat', (req, res) => {
+  const { messages, sessionContext } = req.body;
 
-Regeln:
-- Beantworte Fragen ausschließlich basierend auf dem Inhalt des Repositories.
-- Wenn die Antwort nicht in den Repository-Dateien zu finden ist, sage das ehrlich.
-- Zitiere relevante Dateien und Abschnitte in deinen Antworten.
-- Antworte in der Sprache, in der die Frage gestellt wird.
-- Du darfst keine externen URLs aufrufen oder Informationen aus externen Quellen verwenden, außer diese sind explizit in der Whitelist: ${JSON.stringify(config.whitelistedUrls)}
-${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
+  if (!Array.isArray(messages) || messages.length === 0) {
+    return res.status(400).json({ error: 'messages array is required' });
+  }
 
-  const geminiContents = messages.map(m => ({
-    role: m.role === 'assistant' ? 'model' : 'user',
-    parts: [{ text: m.content }],
-  }));
+  const prompt = buildPrompt(messages, sessionContext);
+  const { command, args = [], env = {} } = config.cli;
 
   res.writeHead(200, {
     'Content-Type': 'text/event-stream',
@@ -140,38 +53,53 @@ ${sessionContext ? `\nKontext dieser Session: ${sessionContext}` : ''}`;
     'Connection': 'keep-alive',
   });
 
-  try {
-    const response = await client.models.generateContentStream({
-      model: config.gemini.model,
-      contents: geminiContents,
-      config: { systemInstruction, maxOutputTokens: config.gemini.maxOutputTokens },
-    });
-
-    let totalChars = 0;
-    for await (const chunk of response) {
-      const text = chunk.text;
-      if (text) {
-        totalChars += text.length;
-        res.write(`data: ${JSON.stringify({ type: 'delta', text })}\n\n`);
-      }
-    }
+  const child = spawn(command, [...args, prompt], {
+    cwd: REPO_ROOT,
+    env: { ...process.env, ...env },
+    stdio: ['ignore', 'pipe', 'pipe'],
+  });
+
+  let totalChars = 0;
+
+  child.stdout.on('data', (chunk) => {
+    const text = chunk.toString();
+    totalChars += text.length;
+    res.write(`data: ${JSON.stringify({ type: 'delta', text })}\n\n`);
+  });
+
+  let stderr = '';
+  child.stderr.on('data', (chunk) => { stderr += chunk.toString(); });
 
+  child.on('close', (code) => {
+    if (code !== 0 && stderr) {
+      res.write(`data: ${JSON.stringify({ type: 'error', error: stderr.trim() })}\n\n`);
+    }
     res.write(`data: ${JSON.stringify({ type: 'done', usage: { totalChars } })}\n\n`);
-  } catch (err) {
-    res.write(`data: ${JSON.stringify({ type: 'error', error: err.message })}\n\n`);
-  }
+    res.end();
+  });
 
-  res.end();
+  child.on('error', (err) => {
+    res.write(`data: ${JSON.stringify({ type: 'error', error: `Failed to start "${command}": ${err.message}` })}\n\n`);
+    res.end();
+  });
+
+  // Abort on client disconnect
+  req.on('close', () => { child.kill(); });
+});
+
+// Health check
+app.get('/api/health', (_req, res) => {
+  res.json({ status: 'ok', cli: config.cli.command });
 });
 
+// SPA fallback
 app.get('*', (_req, res) => {
   res.sendFile(path.join(__dirname, 'public', 'index.html'));
 });
 
 const PORT = config.port;
 app.listen(PORT, () => {
-  const { files } = getRepoContext();
   console.log(`Markdown QA Server running on http://localhost:${PORT}`);
   console.log(`Repository root: ${REPO_ROOT}`);
-  console.log(`Indexed ${files.length} files: ${files.map(f => f.path).join(', ')}`);
+  console.log(`CLI backend: ${config.cli.command} ${config.cli.args.join(' ')}`);
 });

From 8bbb624008e12c18167138aac23390dfb8b61f2b Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sat, 14 Feb 2026 11:37:14 +0000
Subject: [PATCH 5/6] Security hardening for CLI backend

- Add '--' separator before prompt argument to prevent flag injection
  (user input starting with '--' was interpreted as CLI flags)
- Bind to 127.0.0.1 instead of 0.0.0.0 (was network-accessible)
- Add MAX_CONCURRENT=3 process limit with 429 response
- Stop leaking raw stderr to client; log server-side, send generic error
- Validate message structure: role must be user/assistant, content must
  be a non-empty string, sessionContext must be string if present
- Set explicit JSON body limit (200kb)

https://claude.ai/code/session_01SDQnB7k2EERPaMDhm6xknd
---
 markdown-qa/server.js | 53 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 47 insertions(+), 6 deletions(-)

diff --git a/markdown-qa/server.js b/markdown-qa/server.js
index 63740b4..17f61f9 100644
--- a/markdown-qa/server.js
+++ b/markdown-qa/server.js
@@ -6,9 +6,10 @@ const { spawn } = require('child_process');
 const config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), 'utf-8'));
 
 const REPO_ROOT = path.resolve(__dirname, config.repoRoot);
+const MAX_CONCURRENT = 3;
 
 const app = express();
-app.use(express.json());
+app.use(express.json({ limit: '200kb' }));
 app.use(express.static(path.join(__dirname, 'public')));
 
 // --- Build prompt from conversation history + context ---
@@ -35,6 +36,24 @@ function buildPrompt(messages, sessionContext) {
   return parts.join('\n\n');
 }
 
+// --- Validate incoming message structure ---
+
+function validateMessages(messages) {
+  const VALID_ROLES = new Set(['user', 'assistant']);
+
+  for (const msg of messages) {
+    if (!msg || typeof msg !== 'object') return 'each message must be an object';
+    if (!VALID_ROLES.has(msg.role)) return `invalid role: "${msg.role}"`;
+    if (typeof msg.content !== 'string') return 'message content must be a string';
+    if (msg.content.length === 0) return 'message content must not be empty';
+  }
+  return null;
+}
+
+// --- Concurrency tracking ---
+
+let activeProcesses = 0;
+
 // --- Spawn CLI and stream output as SSE ---
 
 app.post('/api/chat', (req, res) => {
@@ -44,6 +63,19 @@ app.post('/api/chat', (req, res) => {
     return res.status(400).json({ error: 'messages array is required' });
   }
 
+  const validationError = validateMessages(messages);
+  if (validationError) {
+    return res.status(400).json({ error: validationError });
+  }
+
+  if (sessionContext !== undefined && typeof sessionContext !== 'string') {
+    return res.status(400).json({ error: 'sessionContext must be a string' });
+  }
+
+  if (activeProcesses >= MAX_CONCURRENT) {
+    return res.status(429).json({ error: 'Too many concurrent requests. Try again shortly.' });
+  }
+
   const prompt = buildPrompt(messages, sessionContext);
   const { command, args = [], env = {} } = config.cli;
 
@@ -53,7 +85,10 @@ app.post('/api/chat', (req, res) => {
     'Connection': 'keep-alive',
   });
 
-  const child = spawn(command, [...args, prompt], {
+  activeProcesses++;
+
+  // '--' signals end-of-flags so the prompt is never parsed as a CLI option
+  const child = spawn(command, [...args, '--', prompt], {
     cwd: REPO_ROOT,
     env: { ...process.env, ...env },
     stdio: ['ignore', 'pipe', 'pipe'],
@@ -71,15 +106,20 @@ app.post('/api/chat', (req, res) => {
   child.stderr.on('data', (chunk) => { stderr += chunk.toString(); });
 
   child.on('close', (code) => {
+    activeProcesses--;
     if (code !== 0 && stderr) {
-      res.write(`data: ${JSON.stringify({ type: 'error', error: stderr.trim() })}\n\n`);
+      // Only send a generic error message; log full stderr server-side
+      console.error(`CLI stderr (exit ${code}):`, stderr.trim());
+      res.write(`data: ${JSON.stringify({ type: 'error', error: `CLI exited with code ${code}` })}\n\n`);
     }
     res.write(`data: ${JSON.stringify({ type: 'done', usage: { totalChars } })}\n\n`);
     res.end();
   });
 
   child.on('error', (err) => {
-    res.write(`data: ${JSON.stringify({ type: 'error', error: `Failed to start "${command}": ${err.message}` })}\n\n`);
+    activeProcesses--;
+    console.error('CLI spawn error:', err.message);
+    res.write(`data: ${JSON.stringify({ type: 'error', error: `Failed to start CLI` })}\n\n`);
     res.end();
   });
 
@@ -98,8 +138,9 @@ app.get('*', (_req, res) => {
 });
 
 const PORT = config.port;
-app.listen(PORT, () => {
-  console.log(`Markdown QA Server running on http://localhost:${PORT}`);
+const HOST = '127.0.0.1';
+app.listen(PORT, HOST, () => {
+  console.log(`Markdown QA Server running on http://${HOST}:${PORT}`);
   console.log(`Repository root: ${REPO_ROOT}`);
   console.log(`CLI backend: ${config.cli.command} ${config.cli.args.join(' ')}`);
 });

From 941fc013dd7a4c3bf41f8434e1f4573d208d3562 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sat, 14 Feb 2026 12:00:38 +0000
Subject: [PATCH 6/6] Fix edge cases: double-decrement, session-switch, error
 persistence, ordered lists
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Server:
- Fix activeProcesses double-decrement when spawn fails (both 'error'
  and 'close' events fire). Use a finish() guard so it decrements once.
- Also prevents res.write() after res.end() in the same scenario.

Frontend:
- Capture sessionId at start of sendMessage so the completion handler
  saves to the correct session even if the user switches mid-stream.
- Stop persisting error messages as assistant messages — they were
  polluting conversation history sent to the CLI on subsequent turns.
- Fix ordered lists: numbered items (1. 2. 3.) now get wrapped in <ol>
  instead of being orphaned <li> elements.
- Remove dead code: unused observedAttributes/attributeChangedCallback
  on SessionItem, unused createdAt field on sessions.

https://claude.ai/code/session_01SDQnB7k2EERPaMDhm6xknd
---
 markdown-qa/public/index.html | 26 +++++++++-----------------
 markdown-qa/server.js         | 20 ++++++++++++--------
 2 files changed, 21 insertions(+), 25 deletions(-)

diff --git a/markdown-qa/public/index.html b/markdown-qa/public/index.html
index 40ff8ab..dcfb7ea 100644
--- a/markdown-qa/public/index.html
+++ b/markdown-qa/public/index.html
@@ -511,10 +511,11 @@ <h2>Repository Q&A</h2>
         // Blockquotes
         html = html.replace(/^&gt; (.+)$/gm, '<blockquote>$1</blockquote>');
 
-        // Lists
+        // Lists — ordered first (so they don't get caught by the unordered wrapper)
+        html = html.replace(/((?:^\d+\. .+$\n?)+)/gm, (block) =>
+          '<ol>' + block.replace(/^\d+\. (.+)$/gm, '<li>$1</li>') + '</ol>');
         html = html.replace(/^[-*] (.+)$/gm, '<li>$1</li>');
         html = html.replace(/((?:<li>.*<\/li>\n?)+)/g, '<ul>$1</ul>');
-        html = html.replace(/^\d+\. (.+)$/gm, '<li>$1</li>');
 
         // Paragraphs
         html = html.split(/\n{2,}/).map(block => {
@@ -542,8 +543,6 @@ <h2>Repository Q&A</h2>
     // ========== Web Components ==========
 
     class SessionItem extends HTMLElement {
-      static observedAttributes = ['active'];
-
       #data = null;
 
       constructor() {
@@ -573,8 +572,6 @@ <h2>Repository Q&A</h2>
         this.shadowRoot.querySelector('.meta').textContent =
           `${formatDate(session.updatedAt)} · ${session.messages.length} Nachr.${ctx}`;
       }
-
-      attributeChangedCallback() {}
     }
 
     class ChatMessage extends HTMLElement {
@@ -714,7 +711,6 @@ <h2>Repository Q&A</h2>
           title: 'Neue Session',
           context: '',
           messages: [],
-          createdAt: new Date().toISOString(),
           updatedAt: new Date().toISOString(),
         };
         await this.#store.put(session);
@@ -795,10 +791,13 @@ <h2>Repository Q&A</h2>
         const text = this.#el.input.value.trim();
         if (!text) return;
 
+        // Capture session ID so it stays correct even if user switches sessions
+        const sessionId = this.#currentId;
+
         this.#el.input.value = '';
         this.#el.input.style.height = 'auto';
 
-        const session = await this.#store.get(this.#currentId);
+        const session = await this.#store.get(sessionId);
         if (!session) return;
 
         session.messages.push({ role: 'user', content: text });
@@ -814,7 +813,6 @@ <h2>Repository Q&A</h2>
         await this.#renderSessionList();
         this.#scrollToBottom();
 
-        // Create streaming placeholder
         this.#streaming = true;
         this.#updateInputState();
 
@@ -875,7 +873,7 @@ <h2>Repository Q&A</h2>
           msgEl.setContent(fullText);
           msgEl.setUsage(usage);
 
-          const updated = await this.#store.get(this.#currentId);
+          const updated = await this.#store.get(sessionId);
           updated.messages.push({ role: 'assistant', content: fullText, usage });
           updated.updatedAt = new Date().toISOString();
           await this.#store.put(updated);
@@ -885,13 +883,7 @@ <h2>Repository Q&A</h2>
         } catch (err) {
           msgEl.setError(`Fehler: ${err.message}`);
           this.#setStatus('error');
-
-          const updated = await this.#store.get(this.#currentId);
-          if (updated) {
-            updated.messages.push({ role: 'assistant', content: `Fehler: ${err.message}` });
-            updated.updatedAt = new Date().toISOString();
-            await this.#store.put(updated);
-          }
+          // Don't persist error messages — they would pollute conversation history
         }
 
         this.#streaming = false;
diff --git a/markdown-qa/server.js b/markdown-qa/server.js
index 17f61f9..99d4971 100644
--- a/markdown-qa/server.js
+++ b/markdown-qa/server.js
@@ -7,6 +7,7 @@ const config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), '
 
 const REPO_ROOT = path.resolve(__dirname, config.repoRoot);
 const MAX_CONCURRENT = 3;
+let activeProcesses = 0;
 
 const app = express();
 app.use(express.json({ limit: '200kb' }));
@@ -50,10 +51,6 @@ function validateMessages(messages) {
   return null;
 }
 
-// --- Concurrency tracking ---
-
-let activeProcesses = 0;
-
 // --- Spawn CLI and stream output as SSE ---
 
 app.post('/api/chat', (req, res) => {
@@ -86,6 +83,13 @@ app.post('/api/chat', (req, res) => {
   });
 
   activeProcesses++;
+  let finished = false;
+
+  function finish() {
+    if (finished) return;
+    finished = true;
+    activeProcesses--;
+  }
 
   // '--' signals end-of-flags so the prompt is never parsed as a CLI option
   const child = spawn(command, [...args, '--', prompt], {
@@ -106,9 +110,8 @@ app.post('/api/chat', (req, res) => {
   child.stderr.on('data', (chunk) => { stderr += chunk.toString(); });
 
   child.on('close', (code) => {
-    activeProcesses--;
+    finish();
     if (code !== 0 && stderr) {
-      // Only send a generic error message; log full stderr server-side
       console.error(`CLI stderr (exit ${code}):`, stderr.trim());
       res.write(`data: ${JSON.stringify({ type: 'error', error: `CLI exited with code ${code}` })}\n\n`);
     }
@@ -117,9 +120,10 @@ app.post('/api/chat', (req, res) => {
   });
 
   child.on('error', (err) => {
-    activeProcesses--;
+    finish();
     console.error('CLI spawn error:', err.message);
-    res.write(`data: ${JSON.stringify({ type: 'error', error: `Failed to start CLI` })}\n\n`);
+    res.write(`data: ${JSON.stringify({ type: 'error', error: 'Failed to start CLI' })}\n\n`);
+    res.write(`data: ${JSON.stringify({ type: 'done', usage: { totalChars: 0 } })}\n\n`);
     res.end();
   });