diff --git a/src/stores/bench-store.spec.ts b/src/stores/bench-store.spec.ts
new file mode 100644
index 0000000..f378fe3
--- /dev/null
+++ b/src/stores/bench-store.spec.ts
@@ -0,0 +1,205 @@
+import { createPinia, setActivePinia } from 'pinia';
+import { beforeEach, describe, expect, it } from 'vitest';
+
+import { useBenchStore } from './bench-store';
+
+beforeEach(() => {
+  setActivePinia(createPinia());
+});
+describe('openOrActivateTab', () => {
+  it('未打开的接口：追加并激活', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    expect(store.openTabs).toEqual(['/v1/models']);
+    expect(store.activeTab).toBe('/v1/models');
+  });
+
+  it('已打开的接口：仅激活，不重复追加（Postman 语义）', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/api/log/token');
+    store.openOrActivateTab('/v1/models');
+    expect(store.openTabs).toEqual(['/v1/models', '/api/log/token']);
+    expect(store.activeTab).toBe('/v1/models');
+  });
+
+  it('保持开启顺序（不按字典序）', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/api/usage/token');
+    store.openOrActivateTab('/v1/dashboard/billing/subscription');
+    store.openOrActivateTab('/v1/models');
+    expect(store.openTabs).toEqual([
+      '/api/usage/token',
+      '/v1/dashboard/billing/subscription',
+      '/v1/models',
+    ]);
+  });
+});
+
+describe('skKeys（每 tab 独立，仅内存态）', () => {
+  it('未设置时返回空串', () => {
+    const store = useBenchStore();
+    expect(store.getSkKey('/v1/models')).toBe('');
+  });
+
+  it('setSkKey 按路径存取值（tab 间互不干扰）', () => {
+    const store = useBenchStore();
+    store.setSkKey('/v1/models', 'sk-models');
+    store.setSkKey('/api/log/token', 'sk-logs');
+    expect(store.getSkKey('/v1/models')).toBe('sk-models');
+    expect(store.getSkKey('/api/log/token')).toBe('sk-logs');
+  });
+
+  it('覆盖写入生效（同 tab 换 key）', () => {
+    const store = useBenchStore();
+    store.setSkKey('/v1/models', 'sk-old');
+    store.setSkKey('/v1/models', 'sk-new');
+    expect(store.getSkKey('/v1/models')).toBe('sk-new');
+  });
+
+  it('closeTab 清除该 tab 的 key；其他 tab 不受影响', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/api/log/token');
+    store.setSkKey('/v1/models', 'sk-models');
+    store.setSkKey('/api/log/token', 'sk-logs');
+
+    store.closeTab('/v1/models');
+    expect(store.getSkKey('/v1/models')).toBe('');
+    expect(store.getSkKey('/api/log/token')).toBe('sk-logs');
+
+    // 重新打开是干净面板（key 不复活）
+    store.openOrActivateTab('/v1/models');
+    expect(store.getSkKey('/v1/models')).toBe('');
+  });
+});
+
+describe('closeTab', () => {
+  it('关闭非激活 tab：激活态不变', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/api/log/token');
+    store.closeTab('/v1/models');
+    expect(store.openTabs).toEqual(['/api/log/token']);
+    expect(store.activeTab).toBe('/api/log/token');
+  });
+
+  it('关闭激活 tab：优先激活右侧相邻 tab，被关的是最后一个则取左侧', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/v1/dashboard/billing/usage');
+    store.openOrActivateTab('/api/usage/token');
+    // 当前激活最后一个（/api/usage/token）→ 无右侧，激活左侧
+    store.closeTab('/api/usage/token');
+    expect(store.activeTab).toBe('/v1/dashboard/billing/usage');
+
+    // 重开 /api/usage/token → tabs = [models, billing/usage, api/usage/token]
+    // 关中间的 billing/usage（非激活）：激活态不变（activeTab 仍是 api/usage/token）
+    store.openOrActivateTab('/api/usage/token');
+    store.closeTab('/v1/dashboard/billing/usage');
+    expect(store.openTabs).toEqual(['/v1/models', '/api/usage/token']);
+    expect(store.activeTab).toBe('/api/usage/token');
+  });
+
+  it('关闭激活 tab 且存在右侧相邻：右侧补位', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/v1/dashboard/billing/usage');
+    store.openOrActivateTab('/api/usage/token');
+    // 激活中间的 billing/usage 后关闭 → 右侧 api/usage/token 补位
+    store.activateTab('/v1/dashboard/billing/usage');
+    store.closeTab('/v1/dashboard/billing/usage');
+    expect(store.activeTab).toBe('/api/usage/token');
+  });
+
+  it('关闭唯一 tab：activeTab 置空（右侧渲染空态）', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.closeTab('/v1/models');
+    expect(store.openTabs).toEqual([]);
+    expect(store.activeTab).toBeNull();
+    expect(store.hasOpenTabs).toBe(false);
+  });
+
+  it('关闭未打开的路径：无操作', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.closeTab('/v1/nonexistent');
+    expect(store.openTabs).toEqual(['/v1/models']);
+  });
+});
+
+describe('reorderTab', () => {
+  function openThreeTabs(store: ReturnType<typeof useBenchStore>): void {
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/v1/dashboard/billing/usage');
+    store.openOrActivateTab('/api/usage/token');
+  }
+
+  it('前移：0 → 2 位', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/v1/models', 0, 2);
+    expect(store.openTabs).toEqual(['/v1/dashboard/billing/usage', '/api/usage/token', '/v1/models']);
+  });
+
+  it('后移：2 → 0 位', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/api/usage/token', 2, 0);
+    expect(store.openTabs).toEqual(['/api/usage/token', '/v1/models', '/v1/dashboard/billing/usage']);
+  });
+
+  it('相邻换位：0 ↔ 1', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/v1/models', 0, 1);
+    expect(store.openTabs).toEqual(['/v1/dashboard/billing/usage', '/v1/models', '/api/usage/token']);
+  });
+
+  it('原位不动：from === to', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/v1/dashboard/billing/usage', 1, 1);
+    expect(store.openTabs).toEqual(['/v1/models', '/v1/dashboard/billing/usage', '/api/usage/token']);
+  });
+
+  it('路径与索引不匹配：无操作（防御 t-tabs 事件异常）', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/v1/models', 2, 0); // 索引 2 上是 /api/usage/token
+    expect(store.openTabs).toEqual(['/v1/models', '/v1/dashboard/billing/usage', '/api/usage/token']);
+  });
+
+  it('越界索引：无操作', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/v1/models', 0, 99);
+    store.reorderTab('/v1/models', -1, 0);
+    expect(store.openTabs).toEqual(['/v1/models', '/v1/dashboard/billing/usage', '/api/usage/token']);
+  });
+
+  it('重排不影响激活态', () => {
+    const store = useBenchStore();
+    openThreeTabs(store);
+    store.reorderTab('/v1/models', 0, 2);
+    expect(store.activeTab).toBe('/api/usage/token');
+  });
+});
+
+describe('activateTab', () => {
+  it('激活已打开的 tab', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.openOrActivateTab('/api/log/token');
+    store.activateTab('/v1/models');
+    expect(store.activeTab).toBe('/v1/models');
+  });
+
+  it('未打开的路径：忽略（激活入口统一走 openOrActivateTab）', () => {
+    const store = useBenchStore();
+    store.openOrActivateTab('/v1/models');
+    store.activateTab('/v1/nonexistent');
+    expect(store.activeTab).toBe('/v1/models');
+  });
+});
diff --git a/src/stores/bench-store.ts b/src/stores/bench-store.ts
new file mode 100644
index 0000000..9d2d81f
--- /dev/null
+++ b/src/stores/bench-store.ts
@@ -0,0 +1,108 @@
+/**
+ * bench 工作台状态：tabs 的开 / 关 / 激活 + 每 tab 的 sk-key（Postman 语义）
+ * sk-key 2026-09 起提升到 store：EndpointPanel 随 tab 切换卸载重建，
+ * 局部 ref 会丢输入（切回要重贴 key），改由 store 持有以便切 tab 保留；
+ * 无持久化（不落 localStorage），刷新即重置
+ */
+
+import { defineStore } from 'pinia';
+import { computed, ref } from 'vue';
+
+/** tab 的唯一标识即接口路径（设计文档 §3.1：tab 标签直接显示接口路径） */
+export type EndpointPath = string;
+
+export const useBenchStore = defineStore('bench', () => {
+  /* ---------- state ---------- */
+
+  /** 已打开的 tab（按开启顺序） */
+  const openTabs = ref<EndpointPath[]>([]);
+
+  /** 当前激活的 tab；全部关光为 null（右侧渲染空态引导页） */
+  const activeTab = ref<EndpointPath | null>(null);
+
+  /** 每 tab 的 sk-key（仅内存态；key 值由 store 内按路径存取） */
+  const skKeys = ref<Record<EndpointPath, string>>({});
+
+  /* ---------- getters ---------- */
+
+  const hasOpenTabs = computed(() => openTabs.value.length > 0);
+
+  /* ---------- actions ---------- */
+
+  /**
+   * 打开或激活 tab（点击 sider 项 / 再次点击同接口时调用）
+   * Postman 语义：已开则激活，未开则追加并激活
+   */
+  function openOrActivateTab(path: EndpointPath): void {
+    if (!openTabs.value.includes(path)) {
+      openTabs.value.push(path);
+    }
+    activeTab.value = path;
+  }
+
+  /**
+   * 关闭 tab；若关的是激活 tab，激活相邻 tab（优先右侧，无右侧取左侧）
+   * 全部关光 → activeTab = null
+   */
+  function closeTab(path: EndpointPath): void {
+    const closingIndex = openTabs.value.indexOf(path);
+    if (closingIndex === -1) return;
+
+    openTabs.value.splice(closingIndex, 1);
+
+    // 关 tab 即弃 key（Postman 语义：重新打开是干净面板）
+    delete skKeys.value[path];
+
+    if (activeTab.value === path) {
+      // 优先激活紧邻的右侧 tab；被关的是最后一个则取左侧
+      const nextActive = openTabs.value[closingIndex] ?? openTabs.value[closingIndex - 1];
+      activeTab.value = nextActive ?? null;
+    }
+  }
+
+  /** 激活已打开的 tab（未打开则忽略——激活入口统一走 openOrActivateTab） */
+  function activateTab(path: EndpointPath): void {
+    if (openTabs.value.includes(path)) {
+      activeTab.value = path;
+    }
+  }
+
+  /* ---------- sk-key（每 tab 独立，仅内存态） ---------- */
+
+  /** 读取某 tab 的 sk-key（未设置返回空串，与面板初始态一致） */
+  function getSkKey(path: EndpointPath): string {
+    return skKeys.value[path] ?? '';
+  }
+
+  /** 写入某 tab 的 sk-key（空串即清除该项） */
+  function setSkKey(path: EndpointPath, key: string): void {
+    skKeys.value = { ...skKeys.value, [path]: key };
+  }
+
+  /**
+   * 拖拽重排 tab（t-tabs drag-sort 事件回调）
+   * fromIndex/toIndex 均为事件原样值，越界或路径不匹配时无操作（防御 t-tabs 事件异常）
+   */
+  function reorderTab(path: EndpointPath, fromIndex: number, toIndex: number): void {
+    if (fromIndex < 0 || toIndex < 0) return;
+    if (fromIndex >= openTabs.value.length || toIndex >= openTabs.value.length) return;
+    if (openTabs.value[fromIndex] !== path) return;
+
+    // splice 两步走：先摘出，再插入目标位（toIndex 按「摘出后的数组」语义，与 t-tabs 一致）
+    const [movedTab] = openTabs.value.splice(fromIndex, 1);
+    if (movedTab === undefined) return;
+    openTabs.value.splice(toIndex, 0, movedTab);
+  }
+
+  return {
+    openTabs,
+    activeTab,
+    hasOpenTabs,
+    openOrActivateTab,
+    closeTab,
+    activateTab,
+    reorderTab,
+    getSkKey,
+    setSkKey,
+  };
+});