diff --git a/Endpoints/WorkspaceEndpoint.cs b/Endpoints/WorkspaceEndpoint.cs
index 092d5a8..421038d 100644
--- a/Endpoints/WorkspaceEndpoint.cs
+++ b/Endpoints/WorkspaceEndpoint.cs
@@ -38,6 +38,7 @@ public static class WorkspaceEndpoint
     {
         app.MapGet("/api/workspace/tree", HandleTree);
         app.MapGet("/api/workspace/file", HandleFile);
+        app.MapGet("/api/workspace/browse", HandleBrowse);
     }
 
     private static async Task HandleTree(HttpContext ctx)
@@ -157,6 +158,41 @@ public static class WorkspaceEndpoint
         });
     }
 
+    private static async Task HandleBrowse(HttpContext ctx)
+    {
+        var path = ctx.Request.Query["path"].FirstOrDefault() ?? "/";
+
+        var targetPath = Path.GetFullPath(path);
+        if (!Directory.Exists(targetPath))
+        {
+            ctx.Response.StatusCode = 404;
+            await ctx.Response.WriteAsJsonAsync(new { error = "Verzeichnis nicht gefunden" });
+            return;
+        }
+
+        var entries = new List<object>();
+
+        // Parent
+        var parent = Directory.GetParent(targetPath);
+        if (parent != null)
+        {
+            entries.Add(new { name = "..", path = parent.FullName.Replace('\\', '/'), type = "dir" });
+        }
+
+        try
+        {
+            foreach (var dir in Directory.GetDirectories(targetPath).OrderBy(d => Path.GetFileName(d), StringComparer.OrdinalIgnoreCase))
+            {
+                var name = Path.GetFileName(dir);
+                if (IgnoredDirs.Contains(name)) continue;
+                entries.Add(new { name, path = dir.Replace('\\', '/'), type = "dir" });
+            }
+        }
+        catch (UnauthorizedAccessException) { }
+
+        await ctx.Response.WriteAsJsonAsync(new { current = targetPath.Replace('\\', '/'), entries });
+    }
+
     private static bool IsLikelyTextFile(string name)
     {
         var lower = name.ToLowerInvariant();
diff --git a/wwwroot/css/file-explorer.css b/wwwroot/css/file-explorer.css
index 08b954e..a298fd3 100644
--- a/wwwroot/css/file-explorer.css
+++ b/wwwroot/css/file-explorer.css
@@ -46,16 +46,7 @@
 }
 
 .fe-btn {
-  background: var(--f3-bg);
-  border: var(--border-width) solid var(--f3-border);
   padding: var(--s1) var(--s2);
-  cursor: pointer;
-  color: var(--text);
-  font-family: monospace;
-}
-
-.fe-btn:hover:not(:disabled) {
-  border-color: var(--primary);
 }
 
 .fe-btn:disabled {
@@ -78,6 +69,10 @@
   flex-shrink: 0;
 }
 
+.fe-sidebar-full {
+  width: 100%;
+}
+
 .fe-main {
   flex: 1;
   overflow: hidden;
@@ -118,10 +113,6 @@
   margin: auto;
 }
 
-.fe-error {
-  color: #ff6b6b;
-  opacity: 1;
-}
 
 /* Preview */
 
@@ -200,12 +191,3 @@
   flex: 1;
 }
 
-.fe-select-btn {
-  background: var(--primary);
-  border-color: var(--primary);
-  white-space: nowrap;
-}
-
-.fe-select-btn:hover {
-  opacity: 0.85;
-}
diff --git a/wwwroot/css/form.css b/wwwroot/css/form.css
index b680b94..0f50ca8 100644
--- a/wwwroot/css/form.css
+++ b/wwwroot/css/form.css
@@ -32,6 +32,20 @@
   object-fit: cover;
 }
 
+.input-with-btn {
+  display: flex;
+  gap: var(--s2);
+}
+
+.input-with-btn input {
+  flex: 1;
+}
+
+.input-addon-btn {
+  flex-shrink: 0;
+  font-size: 1.1em;
+}
+
 .form-actions {
   display: flex;
   gap: var(--s4);
diff --git a/wwwroot/index.html b/wwwroot/index.html
index 14d38b8..f15d885 100644
--- a/wwwroot/index.html
+++ b/wwwroot/index.html
@@ -69,7 +69,10 @@
       <label>Kontext</label>
       <textarea id="sessionContext" rows="4" placeholder="Zusätzlicher Kontext für den System-Prompt (optional)"></textarea>
       <label>Workspace</label>
-      <input type="text" id="sessionWorkspace" placeholder="Absoluter Pfad zum Arbeitsverzeichnis (optional)">
+      <div class="input-with-btn">
+        <input type="text" id="sessionWorkspace" placeholder="Absoluter Pfad zum Arbeitsverzeichnis (optional)">
+        <button type="button" id="sessionWorkspaceBrowse" class="input-addon-btn">📂</button>
+      </div>
       <div class="form-actions">
         <button id="sessionSaveBtn">Speichern</button>
         <button id="sessionCancelBtn">Abbrechen</button>
diff --git a/wwwroot/js/file-explorer.js b/wwwroot/js/file-explorer.js
index f3fa62d..114be45 100644
--- a/wwwroot/js/file-explorer.js
+++ b/wwwroot/js/file-explorer.js
@@ -258,6 +258,114 @@ function feDoSelect() {
   closeFileExplorer();
 }
 
+// ── Folder Browser Mode ──
+// Nutzt /api/workspace/browse mit absolutem Pfad, zum Ordner-Auswählen.
+
+function openFolderBrowser(opts = {}) {
+  if (_feState) closeFileExplorer();
+
+  _feState = {
+    mode: 'folder',
+    onSelect: opts.onSelect || null,
+    currentAbsPath: opts.startPath || '/',
+    history: []
+  };
+
+  const overlay = document.createElement('div');
+  overlay.id = 'feOverlay';
+  overlay.className = 'fe-overlay';
+  overlay.addEventListener('click', (e) => { if (e.target === overlay) closeFileExplorer(); });
+
+  const modal = document.createElement('div');
+  modal.className = 'fe-modal';
+  modal.innerHTML = `
+    <div class="fe-header">
+      <div class="fe-nav">
+        <button class="fe-btn" id="feBack" title="Zurück" disabled>←</button>
+        <span class="fe-path" id="fePath">/</span>
+      </div>
+      <button class="fe-btn" id="feClose">✕</button>
+    </div>
+    <div class="fe-body">
+      <div class="fe-sidebar fe-sidebar-full" id="feSidebar">
+        <div class="fe-loading">Laden...</div>
+      </div>
+    </div>
+    <div class="fe-footer" id="feFooter">
+      <span class="fe-info" id="feInfo"></span>
+      <button class="fe-btn fe-select-btn" id="feSelectBtn">Diesen Ordner wählen</button>
+    </div>
+  `;
+
+  overlay.appendChild(modal);
+  document.body.appendChild(overlay);
+
+  document.getElementById('feBack').addEventListener('click', fbGoBack);
+  document.getElementById('feClose').addEventListener('click', closeFileExplorer);
+  document.getElementById('feSelectBtn').addEventListener('click', () => {
+    if (_feState && _feState.onSelect) _feState.onSelect(_feState.currentAbsPath);
+    closeFileExplorer();
+  });
+
+  _feState._keyHandler = (e) => { if (e.key === 'Escape') closeFileExplorer(); };
+  document.addEventListener('keydown', _feState._keyHandler);
+
+  fbLoadDir(opts.startPath || '/');
+}
+
+async function fbLoadDir(absPath) {
+  if (!_feState) return;
+
+  const pathEl = document.getElementById('fePath');
+  const sidebar = document.getElementById('feSidebar');
+  const info = document.getElementById('feInfo');
+
+  pathEl.textContent = absPath;
+  info.textContent = absPath;
+  sidebar.innerHTML = '<div class="fe-loading">Laden...</div>';
+
+  try {
+    const resp = await fetch(`/api/workspace/browse?path=${encodeURIComponent(absPath)}`);
+    if (!resp.ok) {
+      const err = await resp.json().catch(() => ({}));
+      sidebar.innerHTML = `<div class="fe-error">${err.error || 'Fehler'}</div>`;
+      return;
+    }
+
+    const data = await resp.json();
+    _feState.currentAbsPath = data.current;
+    pathEl.textContent = data.current;
+    info.textContent = data.current;
+
+    sidebar.innerHTML = '';
+
+    for (const entry of data.entries) {
+      const item = document.createElement('div');
+      item.className = 'fe-item fe-dir';
+      item.textContent = '📁 ' + entry.name;
+      item.addEventListener('click', () => {
+        _feState.history.push(_feState.currentAbsPath);
+        fbLoadDir(entry.path);
+      });
+      sidebar.appendChild(item);
+    }
+
+    if (data.entries.length === 0) {
+      sidebar.innerHTML = '<div class="fe-empty">Leer</div>';
+    }
+
+    document.getElementById('feBack').disabled = _feState.history.length === 0;
+  } catch (e) {
+    sidebar.innerHTML = '<div class="fe-error">Netzwerk-Fehler</div>';
+  }
+}
+
+function fbGoBack() {
+  if (!_feState || _feState.history.length === 0) return;
+  const prev = _feState.history.pop();
+  fbLoadDir(prev);
+}
+
 // ── Helpers ──
 
 function getFileIcon(ext) {
diff --git a/wwwroot/js/pages/session-page.js b/wwwroot/js/pages/session-page.js
index eb07921..4cb5440 100644
--- a/wwwroot/js/pages/session-page.js
+++ b/wwwroot/js/pages/session-page.js
@@ -79,6 +79,19 @@ registerPage('session', {
       imageInput.value = '';
     });
 
+    // Workspace Browse
+    const workspaceBrowse = document.getElementById('sessionWorkspaceBrowse');
+    if (workspaceBrowse) {
+      workspaceBrowse.addEventListener('click', () => {
+        openFolderBrowser({
+          startPath: workspaceEl.value.trim() || '/',
+          onSelect(path) {
+            workspaceEl.value = path;
+          }
+        });
+      });
+    }
+
     // Speichern
     saveBtn.addEventListener('click', async () => {
       const data = {