diff --git a/README.md b/README.md
index 93c9113..bb9b2c9 100644
--- a/README.md
+++ b/README.md
@@ -240,6 +240,8 @@ Use `tag` for the glass channel when you want a compact translucent badge around
 
 > `scheme` controls presets only — it no longer decides scope.
 
+**Apply a scheme to every tag at once:** run **TaskVision: Set Highlight Scheme for All Tags** from the Command Palette or the tree view's `⋯` overflow menu, then pick `neon`, `glass`, `neon+glass`, or `none`. TaskVision writes the choice into every existing `customHighlight` entry **and** `defaultHighlight`, so you no longer have to edit each tag by hand.
+
 ---
 
 ## Quick Start
diff --git a/README_zh.md b/README_zh.md
index 44b061a..418620e 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -238,6 +238,8 @@ TaskVision 使用四个独立样式通道：
 
 > `scheme` 只控制预设启用，不再决定作用范围。
 
+**一次性为所有标签设置方案：** 在命令面板或树视图标题栏的 `⋯` 溢出菜单中运行 **TaskVision: 为所有标签设置高亮方案**，然后选择 `neon`、`glass`、`neon+glass` 或 `none`。TaskVision 会把所选方案写入每一个已存在的 `customHighlight` 条目**以及** `defaultHighlight`，无需再逐个标签手动修改。
+
 ---
 
 ## 快速开始
diff --git a/agent/tasks.md b/agent/tasks.md
index 727282e..dc31649 100644
--- a/agent/tasks.md
+++ b/agent/tasks.md
@@ -15,6 +15,14 @@
 
 ## Session Summary
 
+- Active focus: Implemented issue #2 — added a command to uniformly set the highlight scheme for all tags, resolving that shipped per-tag `customHighlight` entries hid `defaultHighlight`.
+- Verification: `npx qunit test/highlightScheme.tests.js` (5 passing), `npm test` (126 passing), `npm run webpack`, `git --no-pager diff --check` (clean).
+
+## Active Session Task
+
+| Priority | Task                                             | Status    | Owner | Due        |
+| -------- | ------------------------------------------------ | --------- | ----- | ---------- |
+| P1       | Add "set highlight scheme for all tags" command  | Completed | AI    | 2026-07-08 |
 - Active focus: Fixed issue #1 — Cursor rendered a solid gray background block behind the `neon+glass` tag highlight where VS Code showed the intended translucent glass box.
 - Root cause: `buildGlassDecorationOptions` in `src/highlights.js` placed `borderRadius` on the decoration base rule while `backgroundColor`/`border` lived only in `light`/`dark`; a border/borderRadius base rule without a co-located background triggers Cursor's fallback gray fill (microsoft/vscode#175819, wayou/vscode-todo-highlight#434).
 - Fix: re-scoped `borderRadius` into `light`/`dark` alongside the border and injected `backgroundColor: 'transparent'` on any themed object that carries a border/borderRadius without an explicit background; VS Code appearance unchanged.
diff --git a/agent/timeline.md b/agent/timeline.md
index b0c7f76..fc0d7c0 100644
--- a/agent/timeline.md
+++ b/agent/timeline.md
@@ -2,6 +2,8 @@
 
 | 日期时间         | 任务/变更                                                       | 修改文件                                                                                                                                                                                                                                                      | 实现逻辑                                                                                                                                                                                                                                                                                     | 修改动机                                                                                                                                                                   | 结果/备注                                                                                                                                                                                                                                                                                                                                                                                                                 |
 | ---------------- | --------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| 2026-07-08 11:00 | 新增“为所有标签统一设置高亮方案”命令（issue #2）              | src/highlightScheme.js, src/extension.js, package.json, package.nls.json, package.nls.zh-cn.json, test/highlightScheme.tests.js, test/extension.tests.js, README.md, README_zh.md, agent/tasks.md, agent/timeline.md                                            | 新增纯函数模块 `highlightScheme.applySchemeToAllTags`：深拷贝后把所选 scheme 写入每个已存在的 customHighlight 条目及 defaultHighlight（`none` 则删除 scheme 键，保留其他属性、不改动入参）；在 extension.js 注册 `taskvision.setHighlightSchemeForAllTags`，QuickPick 选择 neon/glass/neon+glass/none 后经 `resolveConfigTarget()` 依次写入 customHighlight 与 defaultHighlight，复用既有配置变更监听自动刷新高亮；package.json 贡献命令并加入树视图标题溢出菜单，补齐中英文 NLS，更新 README | issue #2：用户希望一次性统一设置所有 tag 的高亮方案，而内置 per-tag customHighlight 会覆盖 defaultHighlight，导致 defaultHighlight 看似无效 | 已完成；验证执行 `npx qunit test/highlightScheme.tests.js`（5 passing）、`npm test`（126 passing）、`npm run webpack`、`git --no-pager diff --check`（无输出）|
+| 2026-04-29 20:45 | 重新分析 AI 上下文功能逻辑与协作思路 | agent/tasks.md, agent/timeline.md | 只读梳理 `aiContext` 导出器、扩展命令链路、task/context/session sidecar store、稳定 ID 生成、README 协议说明、配置 schema 与测试覆盖，并确认 `.taskvision` 生成文件当前被 Git 跟踪                                                                                                      | 用户要求重新检查 AI 上下文功能部分的逻辑与思路是否合理，需要在继续实现前判断产品定位、数据源边界、会话语义和协作契约是否自洽                                            | 已完成分析；结论为“外部 agent 交接包”的核心方向合理，但 implementation session 未进入导出、sidecar/source 权责边界、跟踪生成文件、状态报告语义和 Extension Host 集成测试仍需收敛；验证执行只读源码/文档/测试核查与 `git --no-pager ls-files .taskvision .gitignore`，未运行测试套件                                                                   |
 | 2026-07-08 11:05 | 修复 Cursor 中标签高亮出现灰色背景块（Issue #1）                | src/highlights.js, test/highlights.decorations.tests.js, agent/tasks.md, agent/timeline.md                                                                                                                                                                    | 重写 `buildGlassDecorationOptions`：把 `borderRadius` 从装饰顶层移入 `light`/`dark` 主题对象并与 `border` 同层；对任何带 `border`/`borderRadius` 但缺少显式背景的主题对象注入 `backgroundColor: 'transparent'`；导出 `_buildGlassDecorationOptions` 供行为测试；新增测试断言不再有顶层 `borderRadius`、`borderRadius` 与背景同层、border-only 时回退透明背景 | Cursor（VS Code 派生版）对同时带 `border`+`borderRadius` 但基础 CSS 规则无显式背景的装饰会填充默认灰色块（microsoft/vscode#175819、wayou/vscode-todo-highlight#434）；原实现把顶层 `borderRadius` 与 `light`/`dark` 背景拆分到不同规则，导致基础规则只有圆角无背景被 Cursor 灰填充，而 VS Code 正常。重新归位后取值不变，VS Code 外观保持一致 | 已完成；验证执行 `npx qunit test/highlights.decorations.tests.js`（5 passing）、`npm test`（124 passing）、`npm run webpack`（成功）；Cursor 未安装于当前环境（`code` 存在、`cursor` 缺失），最终 Cursor 视觉确认需维护者复核；已开 PR（未合并），`Fixes #1` |
 | 2026-07-08 11:05 | 修复 issue #4：ripgrep 输出超过 maxBuffer 时返回部分结果而非整体失败 | src/ripgrep.js, src/extension.js, package.json, package.nls.json, package.nls.zh-cn.json, test/ripgrep.tests.js, agent/tasks.md, agent/timeline.md | 将 `taskvision.ripgrep.ripgrepMaxBuffer` 默认值从 200 提升到 20480（20 MB）并同步中英文 markdownDescription；`ripgrep.search` 超过 maxBuffer 时不再 reject，而是置 `truncated` 标记、SIGINT 停止进程，并在 close 处理器优先 `resolve` `formatResults` 的部分结果（数组附带 `truncated`/`maxBuffer`），保留真实 SIGINT interrupted 与退出码分支；extension.js `search()` 检测 `matches.truncated` 后调用一次性 `notifyBufferTruncated` 警告（复用 `OPEN_SETTINGS_BUTTON` 模式），并在 `rebuild()` 重置该一次性标记；新增部分结果回归测试 | 大型仓库因 ripgrep stdout 超过 200 KB 默认缓冲导致整体 reject、树视图零结果（GitHub issue #4），需要在提高上限的同时对超限做优雅降级，保证已收集的标签仍能展示 | 已完成；验证执行 `npm test`（120 passing，含新增 truncation 用例且既有 `ripgrep.kill forwards SIGINT` interrupted 用例未回归）、`npm run webpack`（构建成功） |
 | 2026-07-08 11:05 | 支持 `%` 注释风格下的 TODO/FIXME 识别 (issue #3) | package.json, src/extension.js, reproduce_issue_v9.js, test/tests.js, CHANGELOG.md, agent/tasks.md, agent/timeline.md | 在默认检测正则 `taskvision.regex.regex` 的注释前缀选择组中加入 `%`（`(//\|#\|<!--\|;\|/\*\|%\|^\|...)`），并同步更新 `src/extension.js` 中“重置为默认”命令与 `reproduce_issue_v9.js` stub 中的同一字面量；新增断言 `% TODO fix this`/`% FIXME` 被默认正则识别、且 `//`、`#` 前缀仍生效的 QUnit 用例，并在 CHANGELOG 增加 Unreleased 记录 | LaTeX/Matlab/Erlang 使用 `%` 作为行注释符，原正则缺少 `%`，导致这些注释中的 TODO/FIXME 无法被检测（GitHub issue #3 反馈，报告者建议将 `%` 加入检测正则） | 已完成；验证执行 `npm ci`、`npm test`（120 passing, 0 failing，新增用例通过）、`npm run webpack`（构建成功）、`node -e` 校验 package.json 为合法 JSON 且默认正则含 `%` |
diff --git a/package.json b/package.json
index 0896a7d..4d83508 100644
--- a/package.json
+++ b/package.json
@@ -83,6 +83,11 @@
                     "when": "view =~ /taskvision/",
                     "group": "navigation@1.3"
                 },
+                {
+                    "command": "taskvision.setHighlightSchemeForAllTags",
+                    "when": "view =~ /taskvision/",
+                    "group": "1-highlights@1"
+                },
                 {
                     "command": "taskvision.reveal",
                     "when": "view =~ /taskvision/ && taskvision-tags-only == false && taskvision-show-reveal-button == true",
@@ -674,6 +679,12 @@
                 "command": "taskvision.customizeAppearance",
                 "title": "Customize Tag Appearance",
                 "category": "%taskvision.command.category%"
+            },
+            {
+                "command": "taskvision.setHighlightSchemeForAllTags",
+                "title": "%taskvision.command.setHighlightSchemeForAllTags.title%",
+                "category": "%taskvision.command.category%",
+                "icon": "$(symbol-color)"
             }
         ],
         "configuration": [
diff --git a/package.nls.json b/package.nls.json
index c9cc47b..4d724c8 100644
--- a/package.nls.json
+++ b/package.nls.json
@@ -48,6 +48,7 @@
     "taskvision.command.setTaskStatus.title": "Set Task Status",
     "taskvision.command.setTaskPriority.title": "Set Task Priority",
     "taskvision.command.editTaskNote.title": "Edit Task Note",
+    "taskvision.command.setHighlightSchemeForAllTags.title": "Set Highlight Scheme for All Tags",
     "taskvision.configuration.title": "TaskVision",
     "taskvision.configuration.filtering": "Filtering",
     "taskvision.configuration.filtering.excludedWorkspaces.markdownDescription": "An array of workspace names to exclude as roots in the tree (wildcards can be used).",
diff --git a/package.nls.zh-cn.json b/package.nls.zh-cn.json
index abcdf31..29aa26a 100644
--- a/package.nls.zh-cn.json
+++ b/package.nls.zh-cn.json
@@ -48,6 +48,7 @@
     "taskvision.command.setTaskStatus.title": "设置任务状态",
     "taskvision.command.setTaskPriority.title": "设置任务优先级",
     "taskvision.command.editTaskNote.title": "编辑任务备注",
+    "taskvision.command.setHighlightSchemeForAllTags.title": "为所有标签设置高亮方案",
     "taskvision.configuration.title": "待办事项树",
     "taskvision.configuration.filtering": "滤波",
     "taskvision.configuration.filtering.excludedWorkspaces.markdownDescription": "配置一个工作区名称的列表，列表中的工作区不允许作为树状图的根（允许使用通配符）。",
diff --git a/src/extension.js b/src/extension.js
index 34691bd..6f01baf 100644
--- a/src/extension.js
+++ b/src/extension.js
@@ -23,6 +23,7 @@ var contextStore = require('./contextStore.js');
 var changeSessionStore = require('./changeSessionStore.js');
 var annotationParser = require('./annotationParser.js');
 var aiContext = require('./aiContext.js');
+var highlightScheme = require('./highlightScheme.js');
 
 var searchList = [];
 var currentFilter;
@@ -2451,6 +2452,55 @@ function activate(context) {
             }
         }));
 
+        context.subscriptions.push(vscode.commands.registerCommand('taskvision.setHighlightSchemeForAllTags', function () {
+            var currentConfig = vscode.workspace.getConfiguration('taskvision.highlights');
+            var customHighlight = currentConfig.get('customHighlight', {});
+            var defaultHighlight = currentConfig.get('defaultHighlight', {});
+            var configTarget = resolveConfigTarget();
+
+            var items = [
+                {
+                    label: '$(zap) Neon',
+                    detail: 'Enable glow preset for every tag',
+                    value: 'neon'
+                },
+                {
+                    label: '$(browser) Glass',
+                    detail: 'Enable glass preset for every tag',
+                    value: 'glass'
+                },
+                {
+                    label: '$(sparkle) Neon + Glass',
+                    detail: 'Enable both glow and glass presets for every tag',
+                    value: 'neon+glass'
+                },
+                {
+                    label: '$(circle-slash) None',
+                    detail: 'Clear scheme preset for every tag',
+                    value: 'none'
+                }
+            ];
+
+            vscode.window.showQuickPick(items, {
+                placeHolder: 'Choose a highlight scheme to apply to ALL tags',
+                matchOnDetail: true
+            }).then(function (selection) {
+                if (!selection) {
+                    return;
+                }
+
+                var updated = highlightScheme.applySchemeToAllTags(customHighlight, defaultHighlight, selection.value);
+
+                return Promise.resolve(currentConfig.update('customHighlight', updated.customHighlight, configTarget))
+                    .then(function () {
+                        return currentConfig.update('defaultHighlight', updated.defaultHighlight, configTarget);
+                    })
+                    .then(function () {
+                        vscode.window.showInformationMessage('Applied "' + selection.value + '" highlight scheme to all tags');
+                    });
+            });
+        }));
+
         context.subscriptions.push(vscode.commands.registerCommand('taskvision.customizeAppearance', function (node) {
             if (node && node.tag) {
                 var currentConfig = vscode.workspace.getConfiguration('taskvision.highlights');
diff --git a/src/highlightScheme.js b/src/highlightScheme.js
new file mode 100644
index 0000000..cc3a4c4
--- /dev/null
+++ b/src/highlightScheme.js
@@ -0,0 +1,33 @@
+function clone(value) {
+    return value ? JSON.parse(JSON.stringify(value)) : {};
+}
+
+function shouldClear(scheme) {
+    return scheme === undefined || scheme === null || scheme === '' || scheme === 'none';
+}
+
+function applyScheme(target, scheme) {
+    if (!target || typeof target !== 'object') {
+        return;
+    }
+    if (shouldClear(scheme)) {
+        delete target.scheme;
+    } else {
+        target.scheme = scheme;
+    }
+}
+
+function applySchemeToAllTags(customHighlight, defaultHighlight, scheme) {
+    var updatedCustom = clone(customHighlight);
+    var updatedDefault = clone(defaultHighlight);
+
+    Object.keys(updatedCustom).forEach(function (tag) {
+        applyScheme(updatedCustom[tag], scheme);
+    });
+
+    applyScheme(updatedDefault, scheme);
+
+    return { customHighlight: updatedCustom, defaultHighlight: updatedDefault };
+}
+
+module.exports.applySchemeToAllTags = applySchemeToAllTags;
diff --git a/test/extension.tests.js b/test/extension.tests.js
index 2174ada..6489ca0 100644
--- a/test/extension.tests.js
+++ b/test/extension.tests.js
@@ -51,6 +51,33 @@ QUnit.test('extension updates font appearance in a single customHighlight write'
     assert.ok(source.indexOf('updateConfigValues({ fontWeight: font.fontWeight, fontStyle: font.fontStyle });') !== -1);
 });
 
+QUnit.test('extension registers a command to set the highlight scheme for all tags', function (assert) {
+    var source = fs.readFileSync('src/extension.js', 'utf8');
+
+    assert.ok(source.indexOf("var highlightScheme = require('./highlightScheme.js');") !== -1, 'requires the highlightScheme module');
+    assert.ok(source.indexOf("vscode.commands.registerCommand('taskvision.setHighlightSchemeForAllTags'") !== -1, 'registers the command');
+    assert.ok(source.indexOf('highlightScheme.applySchemeToAllTags(customHighlight, defaultHighlight, selection.value)') !== -1, 'delegates to the pure helper');
+    assert.ok(source.indexOf('var configTarget = resolveConfigTarget();') !== -1, 'uses resolveConfigTarget for the write target');
+    assert.ok(source.indexOf("currentConfig.update('customHighlight', updated.customHighlight, configTarget)") !== -1, 'writes customHighlight with the resolved target');
+    assert.ok(source.indexOf("currentConfig.update('defaultHighlight', updated.defaultHighlight, configTarget)") !== -1, 'writes defaultHighlight with the resolved target');
+});
+
+QUnit.test('package contributes the set-scheme-for-all-tags command in the view title overflow menu', function (assert) {
+    var packageJson = JSON.parse(fs.readFileSync('package.json', 'utf8'));
+
+    var command = packageJson.contributes.commands.find(function (candidate) {
+        return candidate.command === 'taskvision.setHighlightSchemeForAllTags';
+    });
+    assert.ok(command, 'command is contributed');
+    assert.strictEqual(command.title, '%taskvision.command.setHighlightSchemeForAllTags.title%', 'command title uses an NLS key');
+
+    var titleMenu = packageJson.contributes.menus['view/title'].find(function (item) {
+        return item.command === 'taskvision.setHighlightSchemeForAllTags';
+    });
+    assert.ok(titleMenu, 'command is added to the view/title menu');
+    assert.ok(titleMenu.group.indexOf('navigation') === -1, 'command is placed in the overflow menu, not the navigation bar');
+});
+
 QUnit.test('extension source accepts built-in taskvision icons during validation', function (assert) {
     var source = readSource('src/icons.js');
 
@@ -73,7 +100,8 @@ QUnit.test('package localizes contributed command titles', function (assert) {
         'taskvision.addMissingTaskStatuses',
         'taskvision.setTaskStatus',
         'taskvision.setTaskPriority',
-        'taskvision.editTaskNote'
+        'taskvision.editTaskNote',
+        'taskvision.setHighlightSchemeForAllTags'
     ];
 
     commandIds.forEach(function (commandId) {
diff --git a/test/highlightScheme.tests.js b/test/highlightScheme.tests.js
new file mode 100644
index 0000000..047eedc
--- /dev/null
+++ b/test/highlightScheme.tests.js
@@ -0,0 +1,69 @@
+var highlightScheme = require('../src/highlightScheme.js');
+
+QUnit.test('applySchemeToAllTags sets scheme on every existing customHighlight entry and defaultHighlight', function (assert) {
+    var customHighlight = {
+        TODO: { scheme: 'glass', background: '#123456', colorType: 'text' },
+        FIXME: { scheme: 'neon+glass', background: '#9C27B0', icon: 'flame' },
+        NOTE: { background: '#00E5FF' }
+    };
+    var defaultHighlight = { background: '#5C6BC0', scheme: 'neon+glass', icon: 'tag' };
+
+    var result = highlightScheme.applySchemeToAllTags(customHighlight, defaultHighlight, 'neon');
+
+    assert.strictEqual(result.customHighlight.TODO.scheme, 'neon');
+    assert.strictEqual(result.customHighlight.FIXME.scheme, 'neon');
+    assert.strictEqual(result.customHighlight.NOTE.scheme, 'neon', 'entry without prior scheme still receives one');
+    assert.strictEqual(result.defaultHighlight.scheme, 'neon');
+});
+
+QUnit.test('applySchemeToAllTags preserves non-scheme properties', function (assert) {
+    var customHighlight = {
+        TODO: { scheme: 'glass', background: '#123456', colorType: 'text', icon: 'check' }
+    };
+    var defaultHighlight = { background: '#5C6BC0', icon: 'tag', rulerLane: 'center' };
+
+    var result = highlightScheme.applySchemeToAllTags(customHighlight, defaultHighlight, 'neon+glass');
+
+    assert.strictEqual(result.customHighlight.TODO.background, '#123456');
+    assert.strictEqual(result.customHighlight.TODO.colorType, 'text');
+    assert.strictEqual(result.customHighlight.TODO.icon, 'check');
+    assert.strictEqual(result.customHighlight.TODO.scheme, 'neon+glass');
+    assert.strictEqual(result.defaultHighlight.background, '#5C6BC0');
+    assert.strictEqual(result.defaultHighlight.icon, 'tag');
+    assert.strictEqual(result.defaultHighlight.rulerLane, 'center');
+});
+
+QUnit.test('applySchemeToAllTags with none clears scheme from all entries and defaultHighlight', function (assert) {
+    var customHighlight = {
+        TODO: { scheme: 'glass', background: '#123456' },
+        FIXME: { scheme: 'neon+glass', background: '#9C27B0' }
+    };
+    var defaultHighlight = { background: '#5C6BC0', scheme: 'neon+glass' };
+
+    var result = highlightScheme.applySchemeToAllTags(customHighlight, defaultHighlight, 'none');
+
+    assert.notOk('scheme' in result.customHighlight.TODO, 'TODO scheme removed');
+    assert.notOk('scheme' in result.customHighlight.FIXME, 'FIXME scheme removed');
+    assert.strictEqual(result.customHighlight.TODO.background, '#123456', 'other props preserved when clearing');
+    assert.notOk('scheme' in result.defaultHighlight, 'defaultHighlight scheme removed');
+    assert.strictEqual(result.defaultHighlight.background, '#5C6BC0');
+});
+
+QUnit.test('applySchemeToAllTags does not mutate its inputs', function (assert) {
+    var customHighlight = { TODO: { scheme: 'glass', background: '#123456' } };
+    var defaultHighlight = { scheme: 'neon+glass' };
+
+    var result = highlightScheme.applySchemeToAllTags(customHighlight, defaultHighlight, 'neon');
+
+    assert.strictEqual(customHighlight.TODO.scheme, 'glass', 'input customHighlight unchanged');
+    assert.strictEqual(defaultHighlight.scheme, 'neon+glass', 'input defaultHighlight unchanged');
+    assert.notStrictEqual(result.customHighlight, customHighlight, 'returns a new customHighlight object');
+    assert.notStrictEqual(result.customHighlight.TODO, customHighlight.TODO, 'returns new nested entry objects');
+});
+
+QUnit.test('applySchemeToAllTags handles missing config safely', function (assert) {
+    var result = highlightScheme.applySchemeToAllTags(undefined, undefined, 'neon');
+
+    assert.deepEqual(result.customHighlight, {});
+    assert.strictEqual(result.defaultHighlight.scheme, 'neon');
+});