diff --git a/frontend/src/lib/plugin-host/VerstakPluginAPI.js b/frontend/src/lib/plugin-host/VerstakPluginAPI.js
index 4ba0d31..fc68dd6 100644
--- a/frontend/src/lib/plugin-host/VerstakPluginAPI.js
+++ b/frontend/src/lib/plugin-host/VerstakPluginAPI.js
@@ -225,6 +225,23 @@ export function createPluginAPI(pluginId) {
       }
     },
 
+    backend: {
+      call: async function(method, ...args) {
+        assertActive('backend.call(' + method + ')');
+        try {
+          const App = window['go']?.['api']?.['App'];
+          if (!App || typeof App[method] !== 'function') {
+            throw new Error('Backend method not found: ' + method);
+          }
+          const result = await App[method](...args);
+          return result;
+        } catch (e) {
+          const message = e && e.message ? e.message : String(e);
+          throw new Error('[plugin:' + pluginId + '] backend.call(' + method + ') failed: ' + message);
+        }
+      }
+    },
+
     workbench: {
       openResource: async function(request) {
         assertActive('workbench.openResource');
diff --git a/frontend/src/lib/shell/WorkspaceTree.svelte b/frontend/src/lib/shell/WorkspaceTree.svelte
index e9eaa92..abf3dd4 100644
--- a/frontend/src/lib/shell/WorkspaceTree.svelte
+++ b/frontend/src/lib/shell/WorkspaceTree.svelte
@@ -1,7 +1,7 @@
 <script context="module">
   import { writable } from 'svelte/store';
 
-  const activeWorkspaceNodeId = writable('');
+  const activeWorkspaceId = writable('');
 </script>
 
 <script>
@@ -9,40 +9,58 @@
   import * as App from '../../../wailsjs/go/api/App';
   import Icon from '../ui/Icon.svelte';
 
-  export let nodes = [];
-  export let node = null;
-  export let currentNodeId = '';
-  export let expandedNodes = {};
-  export let depth = 0;
-
   let loading = true;
   let localError = '';
+  let workspaces = [];
+  let currentWorkspaceId = '';
   let showCreate = false;
-  let newNodeTitle = '';
-  let newNodeParentId = '';
-  let newNodeType = 'case';
+  let newWorkspaceName = '';
   let creating = false;
+  let renamingId = '';
+  let renameValue = '';
+  let busyId = '';
 
-  onMount(async () => {
-    if (depth === 0) {
-      await loadTree();
-    }
-  });
+  onMount(loadWorkspaces);
 
-  async function loadTree() {
+  function resultOrError(response, fallbackValue) {
+    return typeof response === 'string' ? [fallbackValue, response] : [response, ''];
+  }
+
+  function wsName(workspace) {
+    return String(workspace?.name || workspace?.rootPath || '');
+  }
+
+  function asNode(workspace, order) {
+    const name = wsName(workspace);
+    return {
+      id: name,
+      type: 'space',
+      title: name,
+      name,
+      rootPath: workspace.rootPath || name,
+      status: 'active',
+      order,
+    };
+  }
+
+  function nodesForEvent() {
+    return workspaces.map(asNode);
+  }
+
+  async function loadWorkspaces() {
     loading = true;
     localError = '';
     try {
-      const result = await App.GetWorkspaceTree();
-      if (result.status === 'not initialized') {
-        nodes = [];
-        currentNodeId = '';
+      const [list, err] = resultOrError(await App.ListWorkspaces(), []);
+      if (err) {
+        localError = err;
+        workspaces = [];
       } else {
-        nodes = result.nodes || [];
-        currentNodeId = result.currentNodeId || '';
-        activeWorkspaceNodeId.set(currentNodeId);
-        const root = nodes.find(n => !n.parentId);
-        if (root) expandedNodes[root.id] = true;
+        workspaces = list || [];
+        if (!currentWorkspaceId || !workspaces.some((ws) => wsName(ws) === currentWorkspaceId)) {
+          currentWorkspaceId = wsName(workspaces[0] || {});
+        }
+        activeWorkspaceId.set(currentWorkspaceId);
       }
     } catch (e) {
       localError = String(e);
@@ -50,143 +68,176 @@
     loading = false;
   }
 
-  function childrenOf(parentId) {
-    return nodes.filter(n => n.parentId === parentId).sort((a, b) => a.order - b.order);
-  }
-
-  function roots() {
-    return nodes.filter(n => !n.parentId).sort((a, b) => a.order - b.order);
-  }
-
-  function toggle(id) {
-    expandedNodes[id] = !expandedNodes[id];
-    expandedNodes = expandedNodes;
-  }
-
-  function hasKids(id) {
-    return nodes.some(n => n.parentId === id);
-  }
-
-  function iconName(type) {
-    if (type === 'space') return 'space';
-    if (type === 'case') return 'case';
-    if (type === 'folder') return 'folder';
-    return 'dot';
-  }
-
-  async function selectNode(id) {
-    const err = await App.SetCurrentWorkspaceNode(id);
-    if (err) { localError = err; return; }
-    currentNodeId = id;
-    activeWorkspaceNodeId.set(id);
-    window.dispatchEvent(new CustomEvent('verstak:workspace-node-selected', {
-      detail: { nodeId: id, nodes: nodes }
+  async function selectWorkspace(workspace) {
+    const id = wsName(workspace);
+    const err = await App.SetCurrentWorkspace(id);
+    if (err) {
+      localError = err;
+      return;
+    }
+    currentWorkspaceId = id;
+    activeWorkspaceId.set(id);
+    window.dispatchEvent(new CustomEvent('verstak:workspace-selected', {
+      detail: { workspaceName: id, nodes: nodesForEvent() }
     }));
   }
 
-  function openCreate(parentId, type) {
-    newNodeParentId = parentId;
-    newNodeType = type;
-    newNodeTitle = '';
-    showCreate = true;
-  }
-
   async function doCreate() {
-    if (!newNodeTitle.trim()) return;
+    const name = newWorkspaceName.trim();
+    if (!name) return;
     creating = true;
-    const res = await App.CreateWorkspaceNode(newNodeParentId, newNodeType, newNodeTitle.trim());
-    if (res.error) { localError = res.error; creating = false; return; }
+    localError = '';
+    const [, err] = resultOrError(await App.CreateWorkspace(name, 'default'), null);
+    if (err) {
+      localError = err;
+      creating = false;
+      return;
+    }
     showCreate = false;
+    newWorkspaceName = '';
     creating = false;
-    expandedNodes[newNodeParentId] = true;
-    expandedNodes = expandedNodes;
-    await loadTree();
+    await loadWorkspaces();
+    const created = workspaces.find((ws) => wsName(ws) === name);
+    if (created) await selectWorkspace(created);
   }
 
-  function cancelCreate() {
-    showCreate = false;
-    newNodeTitle = '';
+  function startRename(workspace) {
+    renamingId = wsName(workspace);
+    renameValue = renamingId;
+    localError = '';
+  }
+
+  function cancelRename() {
+    renamingId = '';
+    renameValue = '';
+  }
+
+  async function commitRename(workspace) {
+    const oldName = wsName(workspace);
+    const newName = renameValue.trim();
+    if (!newName || newName === oldName) {
+      cancelRename();
+      return;
+    }
+    busyId = oldName;
+    const err = await App.RenameWorkspace(oldName, newName);
+    if (err) {
+      localError = err;
+      busyId = '';
+      return;
+    }
+    renamingId = '';
+    renameValue = '';
+    busyId = '';
+    currentWorkspaceId = newName;
+    await loadWorkspaces();
+    const renamed = workspaces.find((ws) => wsName(ws) === newName);
+    if (renamed) await selectWorkspace(renamed);
+  }
+
+  async function trashWorkspace(workspace) {
+    const name = wsName(workspace);
+    busyId = name;
+    const [, err] = resultOrError(await App.TrashWorkspace(name), null);
+    if (err) {
+      localError = err;
+      busyId = '';
+      return;
+    }
+    if (currentWorkspaceId === name) currentWorkspaceId = '';
+    busyId = '';
+    await loadWorkspaces();
+    if (currentWorkspaceId) {
+      const selected = workspaces.find((ws) => wsName(ws) === currentWorkspaceId);
+      if (selected) await selectWorkspace(selected);
+    }
   }
 </script>
 
-{#if depth === 0}
-  <div class="wt">
-    <div class="wt-header">
-      <span class="wt-title">Workspace</span>
-      <button class="wt-btn" on:click={() => openCreate('', 'space')} title="New Space" type="button">+</button>
-    </div>
+<div class="wt">
+  <div class="wt-header">
+    <span class="wt-title">Workspaces</span>
+    <button class="wt-btn" on:click={() => { showCreate = true; newWorkspaceName = ''; }} title="New workspace" type="button">+</button>
+  </div>
 
-    {#if loading}
-      <div class="wt-loading">Loading...</div>
-    {:else if localError}
-      <div class="wt-error">{localError}</div>
-    {:else}
-      {#each roots() as node (node.id)}
-        <svelte:self {node} {nodes} {currentNodeId} {expandedNodes} depth={1} {toggle} {hasKids} {selectNode} {openCreate} />
-      {/each}
-    {/if}
+  {#if loading}
+    <div class="wt-loading">Loading...</div>
+  {:else if localError}
+    <div class="wt-error">{localError}</div>
+  {/if}
 
-    {#if showCreate}
-      <div class="wt-create">
-        <div class="wt-create-header">
-          <span>New {newNodeType}</span>
-          <button class="wt-btn" on:click={cancelCreate} type="button">x</button>
-        </div>
-        <input type="text" bind:value={newNodeTitle} placeholder="Name..." disabled={creating} />
-        <div class="wt-create-actions">
-          <button class="wt-btn-primary" on:click={doCreate} type="button" disabled={creating || !newNodeTitle.trim()}>{creating ? '...' : 'Create'}</button>
-          <button class="wt-btn" on:click={cancelCreate} type="button" disabled={creating}>Cancel</button>
+  <div class="wt-list">
+    {#each workspaces as workspace (wsName(workspace))}
+      {@const id = wsName(workspace)}
+      <div class="wt-node" class:selected={id === $activeWorkspaceId}>
+        <div class="wt-row">
+          <span class="wt-icon"><Icon name="space" size={13} class="wt-node-icon" /></span>
+          {#if renamingId === id}
+            <input
+              class="wt-rename"
+              bind:value={renameValue}
+              disabled={busyId === id}
+              on:keydown={(e) => {
+                if (e.key === 'Enter') commitRename(workspace);
+                if (e.key === 'Escape') cancelRename();
+              }}
+            />
+            <button class="wt-btn wt-btn-small wt-always" on:click={() => commitRename(workspace)} title="Save rename" type="button" disabled={busyId === id}>OK</button>
+            <button class="wt-btn wt-btn-small wt-always" on:click={cancelRename} title="Cancel rename" type="button" disabled={busyId === id}>x</button>
+          {:else}
+            <button class="wt-label" on:click={() => selectWorkspace(workspace)} type="button">{id}</button>
+            <button class="wt-icon-btn" on:click={() => startRename(workspace)} title="Rename workspace" type="button" disabled={busyId === id}>
+              <Icon name="edit" size={12} />
+            </button>
+            <button class="wt-icon-btn danger" on:click={() => trashWorkspace(workspace)} title="Trash workspace" type="button" disabled={busyId === id}>
+              <Icon name="trash" size={12} />
+            </button>
+          {/if}
         </div>
       </div>
-    {/if}
+    {/each}
   </div>
-{:else}
-  <div class="wt-node" class:selected={node.id === $activeWorkspaceNodeId} class:archived={node.status === 'archived'} class:sleeping={node.status === 'sleeping'}>
-    <div class="wt-row" style="padding-left: {depth * 1.0 + 0.4}rem;">
-      {#if hasKids(node.id)}
-        <button class="wt-expand" on:click={() => toggle(node.id)} type="button" aria-label={expandedNodes[node.id] ? 'Collapse' : 'Expand'}>
-          <Icon name={expandedNodes[node.id] ? 'chevronDown' : 'chevronRight'} size={12} class="wt-expand-icon" />
-        </button>
-      {:else}
-        <span class="wt-expand-spacer"></span>
-      {/if}
-      <span class="wt-icon"><Icon name={iconName(node.type)} size={13} class="wt-node-icon" /></span>
-      <button class="wt-label" on:click={() => selectNode(node.id)} type="button">{node.title}</button>
-      {#if node.type !== 'case'}
-        <button class="wt-btn wt-btn-small" on:click={() => openCreate(node.id, 'case')} title="Add child" type="button">+</button>
-      {/if}
+
+  {#if showCreate}
+    <div class="wt-create">
+      <div class="wt-create-header">
+        <span>New workspace</span>
+        <button class="wt-btn" on:click={() => { showCreate = false; newWorkspaceName = ''; }} type="button">x</button>
+      </div>
+      <input type="text" bind:value={newWorkspaceName} placeholder="Name..." disabled={creating} />
+      <div class="wt-create-actions">
+        <button class="wt-btn-primary" on:click={doCreate} type="button" disabled={creating || !newWorkspaceName.trim()}>{creating ? '...' : 'Create'}</button>
+        <button class="wt-btn" on:click={() => { showCreate = false; newWorkspaceName = ''; }} type="button" disabled={creating}>Cancel</button>
+      </div>
     </div>
-    {#if expandedNodes[node.id]}
-      {#each childrenOf(node.id) as child (child.id)}
-        <svelte:self node={child} {nodes} {currentNodeId} {expandedNodes} depth={depth + 1} {toggle} {hasKids} {selectNode} {openCreate} />
-      {/each}
-    {/if}
-  </div>
-{/if}
+  {/if}
+</div>
 
 <style>
   .wt { display: flex; flex-direction: column; flex: 1; overflow: hidden; position: relative; }
   .wt-header { display: flex; align-items: center; justify-content: space-between; padding: 0.4rem 0.6rem; border-bottom: 1px solid #0f3460; flex-shrink: 0; }
   .wt-title { color: #a0a0b8; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
+  .wt-list { min-height: 0; overflow-y: auto; padding: 0.2rem 0; }
   .wt-btn { min-height: 0; background: none; border: none; color: #666; cursor: pointer; font-size: 0.85rem; padding: 0.1rem 0.3rem; border-radius: 3px; }
-  .wt-btn:hover { color: #4ecca3; background: rgba(78,204,163,0.1); }
-  .wt-btn-small { font-size: 0.7rem; opacity: 0; }
+  .wt-btn:hover:not(:disabled) { color: #4ecca3; background: rgba(78,204,163,0.1); }
+  .wt-btn-small { font-size: 0.68rem; opacity: 0; }
+  .wt-always { opacity: 1; }
   .wt-row:hover .wt-btn-small { opacity: 1; }
   .wt-loading, .wt-error { padding: 0.5rem; font-size: 0.75rem; color: #666; }
   .wt-error { color: #e94560; }
-  .wt-node { }
-  .wt-row { display: flex; align-items: center; gap: 0.2rem; padding: 0.15rem 0; }
+  .wt-row { display: flex; align-items: center; gap: 0.25rem; padding: 0.15rem 0.45rem; min-height: 1.7rem; }
   .wt-row:hover { background: rgba(15,52,96,0.4); }
   .wt-node.selected > .wt-row { background: rgba(78,204,163,0.1); }
-  .wt-expand { width: 1rem; height: 1rem; min-height: 0; display: flex; align-items: center; justify-content: center; font-size: 0.65rem; color: #666; background: none; border: none; cursor: pointer; padding: 0; flex-shrink: 0; }
-  .wt-expand:hover { color: #e0e0f0; }
-  .wt-expand-spacer { width: 1rem; flex-shrink: 0; }
   .wt-icon { width: 0.9rem; height: 0.9rem; display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; color: #a0a0b8; }
-  :global(.wt-node-icon), :global(.wt-expand-icon) { display: block; }
-  .wt-label { flex: 1; min-height: 0; justify-content: flex-start; background: none; border: none; color: #e0e0f0; font-size: 0.78rem; text-align: left; cursor: pointer; padding: 0.1rem 0.2rem; border-radius: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  :global(.wt-node-icon) { display: block; }
+  .wt-label { flex: 1; min-width: 0; min-height: 0; justify-content: flex-start; background: none; border: none; color: #e0e0f0; font-size: 0.78rem; text-align: left; cursor: pointer; padding: 0.1rem 0.2rem; border-radius: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
   .wt-label:hover { color: #4ecca3; }
-  .wt-node.archived .wt-label { text-decoration: line-through; opacity: 0.5; }
-  .wt-node.sleeping .wt-label { opacity: 0.6; }
+  .wt-icon-btn { width: 1.25rem; height: 1.25rem; min-height: 0; padding: 0; border: none; background: transparent; color: #666; opacity: 0; flex-shrink: 0; cursor: pointer; border-radius: 3px; }
+  .wt-row:hover .wt-icon-btn { opacity: 1; }
+  .wt-icon-btn:hover:not(:disabled) { color: #4ecca3; background: rgba(78,204,163,0.1); }
+  .wt-icon-btn.danger:hover:not(:disabled) { color: #e94560; background: rgba(233,69,96,0.12); }
+  .wt-rename { flex: 1; min-width: 0; background: #0f3460; border: 1px solid #1a3a5c; color: #e0e0f0; padding: 0.2rem 0.35rem; border-radius: 4px; font-size: 0.78rem; }
+  .wt-rename:focus { outline: none; border-color: #4ecca3; }
   .wt-create { position: absolute; bottom: 0; left: 0; right: 0; background: #16213e; border-top: 1px solid #0f3460; padding: 0.6rem; z-index: 10; }
   .wt-create-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.4rem; color: #a0a0b8; font-size: 0.7rem; text-transform: uppercase; }
   .wt-create input { width: 100%; background: #0f3460; border: 1px solid #1a3a5c; color: #e0e0f0; padding: 0.35rem 0.5rem; border-radius: 4px; font-size: 0.8rem; margin-bottom: 0.4rem; box-sizing: border-box; }
@@ -194,5 +245,5 @@
   .wt-create-actions { display: flex; gap: 0.4rem; justify-content: flex-end; }
   .wt-btn-primary { background: #4ecca3; color: #1a1a2e; border: none; padding: 0.3rem 0.6rem; border-radius: 4px; cursor: pointer; font-size: 0.75rem; font-weight: 600; }
   .wt-btn-primary:hover:not(:disabled) { background: #3dbb92; }
-  .wt-btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
+  .wt-btn-primary:disabled, .wt-btn:disabled, .wt-icon-btn:disabled { opacity: 0.5; cursor: not-allowed; }
 </style>