diff --git a/AGENTS.md b/AGENTS.md
index 24b7a9f..4803df2 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -712,7 +712,7 @@ better-sidebar 自己的内置 tab 和 viewer 就是参考实现（"吃狗粮"
 - **`tests/service.spec.ts`**：注册表生命周期 / 匹配算法 / dedupe / createTab / 启用态 gating 测试
 - **`tests/builtins.spec.ts`**：内置注册清单断言（7 tab + 6 viewer + 声明式元数据）
 - **`src/client/plugins-tabs.ts`** / **`src/client/plugins-viewers.ts`**：推荐插件目录（名字/url/简介/安装脚本，分别对应 Tab 注册与文件预览注册），在设置页两个「添加插件」弹窗展示（共享类型在 `plugins-shared.ts`）；插件作者可按扩展点加一条数据（弹窗内「跳转」直达仓库、「复制」把安装命令写入剪贴板，粘贴到 DSH 所在环境的终端执行）——数据完整性由 `tests/plugin-list.spec.ts` 守护
-- **`src/client/FileTree.tsx`** / **`src/client/TreePanel.tsx`** / **`src/fs-search.ts`**：受控文件树组件（纯树体，文件行右键菜单含「在新 Tab 中打开」「在侧边打开」，仅宿主编排提供回调时渲染）/ 树面板（搜索框 + 刷新 + FileTree，文件窗口的内嵌 dock 使用）与 host 侧递归文件名搜索（`fs.search` 路由，预算兜底 + 跳过 `.git`/symlink 目录；测试 `tests/fs-search.spec.ts`、组件测试 `tests/editor-host.spec.tsx`）
+- **`src/client/FileTree.tsx`** / **`src/client/TreePanel.tsx`** / **`src/fs-search.ts`**：受控文件树组件（纯树体，文件行右键菜单含「在新 Tab 中打开」「在侧边打开」，仅宿主编排提供回调时渲染）/ 树面板（搜索框 + 刷新 + FileTree，文件窗口的内嵌 dock 使用）与 host 侧递归文件名搜索（`fs.search` 路由，预算兜底 + 跳过 `.git` / `node_modules` / 构建缓存 / symlink 目录；测试 `tests/fs-search.spec.ts`、组件测试 `tests/editor-host.spec.tsx`）
 - **`docs/plans/2026-08-11-service-registry-design.md`** / **`docs/plans/2026-08-11-declarative-sidebar-settings-design.md`** / **`docs/plans/2026-08-14-add-plugins-modal-design.md`**：设计文档（含实施偏差记录）
 
 调试时直接读这些文件即可看到所有 API 的真实用法。
diff --git a/src/fs-search.ts b/src/fs-search.ts
index 597bbb0..c78d98f 100644
--- a/src/fs-search.ts
+++ b/src/fs-search.ts
@@ -3,14 +3,14 @@
  * Streams the tree with opendir and matches the query as a case-insensitive
  * substring of each entry's NAME (paths stay relative to the search root —
  * the client resolves them against the session cwd). No .gitignore semantics
- * (this is a name lookup, not a code search), but `.git` directories are
- * skipped outright (VCS internals are never useful results) and symlink
- * directories are NOT descended (cycle safety).
+ * (this is a name lookup, not a code search), but known noise directories
+ * (`.git`, `node_modules`, package-manager stores, build caches) are
+ * skipped outright and symlink directories are NOT descended (cycle safety).
  *
  * Two performance budgets bound the walk: `maxMatches` (the client renders
- * the flat list) and `maxVisited` (a runaway tree — a home directory root,
- * a node_modules forest — must not stall the host). Exceeding either stops
- * early with `truncated: true`.
+ * the flat list) and `maxVisited` (a runaway tree — a home directory root
+ * — must not stall the host). Exceeding either stops early with
+ * `truncated: true`.
  */
 import { opendir } from 'node:fs/promises'
 import { join, relative, sep } from 'node:path'
@@ -33,6 +33,33 @@ export interface FsSearchOptions {
 const DEFAULT_MAX_MATCHES = 200
 const DEFAULT_MAX_VISITED = 100_000
 
+/**
+ * Directory names that are never useful filename-search results and would
+ * burn the visit budget before the walk reaches project files. Compared
+ * case-insensitively so `Node_Modules` / `.GIT` stay skipped on every
+ * platform. The directory itself is neither matched nor descended.
+ */
+const SEARCH_SKIP_DIRS = new Set([
+  '.git',
+  'node_modules',
+  '.pnpm-store',
+  '.yarn',
+  '.turbo',
+  '.turbopack',
+  '.next',
+  '.nuxt',
+  '.output',
+  '.cache',
+  '.parcel-cache',
+  'coverage',
+  'dist',
+  'build',
+  'out',
+  '.umi',
+  '.umi-production',
+  '.dumi',
+])
+
 /**
  * Search `root` recursively for entries whose name contains `query`
  * (case-insensitive).
@@ -63,8 +90,8 @@ export async function searchFiles(root: string, query: string, opts: FsSearchOpt
         truncated = true
         return
       }
-      // .git is VCS-internal noise: never matched, never descended.
-      if (dirent.isDirectory() && dirent.name === '.git') continue
+      // Dependency / VCS / build-output forests: never matched, never descended.
+      if (dirent.isDirectory() && SEARCH_SKIP_DIRS.has(dirent.name.toLowerCase())) continue
       if (dirent.name.toLowerCase().includes(needle)) {
         matches.push(join(relative(root, dir), dirent.name))
         if (matches.length >= maxMatches) {
diff --git a/tests/fs-search.spec.ts b/tests/fs-search.spec.ts
index 9bb0c6b..ca10763 100644
--- a/tests/fs-search.spec.ts
+++ b/tests/fs-search.spec.ts
@@ -1,9 +1,10 @@
 /**
  * fs-search: the host's recursive file-name search behind the editor side
  * panel's search box. Matches are case-insensitive name substrings, reported
- * RELATIVE to the root ('/'-separated); `.git` directories are skipped,
- * symlinked directories are never descended (cycle safety), and the
- * maxMatches/maxVisited budgets stop a runaway walk with `truncated: true`.
+ * RELATIVE to the root ('/'-separated); noise directories (`.git`,
+ * `node_modules`, build caches) are skipped, symlinked directories are
+ * never descended (cycle safety), and the maxMatches/maxVisited budgets
+ * stop a runaway walk with `truncated: true`.
  */
 import { describe, expect, it } from 'vitest'
 import { mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync } from 'node:fs'
@@ -86,6 +87,27 @@ describe('fs-search', () => {
     }
   })
 
+  it('never descends into node_modules or other noise directories', async () => {
+    const dir = makeFixture()
+    try {
+      mkdirSync(join(dir, 'node_modules', 'left-pad'), { recursive: true })
+      mkdirSync(join(dir, 'web', 'dist'), { recursive: true })
+      writeFileSync(join(dir, 'node_modules', 'left-pad', 'guide.md'), 'dep')
+      writeFileSync(join(dir, 'web', 'dist', 'bundle.js'), 'build')
+      writeFileSync(join(dir, 'web', 'app.ts'), 'src')
+      // A match hidden behind node_modules / dist must not appear; project
+      // files after those forests must still be reachable within budget.
+      expect((await searchFiles(dir, 'guide')).matches).toEqual(['docs/guide.md'])
+      expect((await searchFiles(dir, 'left-pad')).matches).toEqual([])
+      expect((await searchFiles(dir, 'bundle')).matches).toEqual([])
+      expect((await searchFiles(dir, 'app.ts')).matches).toEqual(['web/app.ts'])
+      expect((await searchFiles(dir, 'node_modules')).matches).toEqual([])
+      expect((await searchFiles(dir, 'dist')).matches).toEqual([])
+    } finally {
+      rmSync(dir, { recursive: true, force: true })
+    }
+  })
+
   it('an empty (or whitespace) query matches nothing without walking', async () => {
     const dir = makeFixture()
     try {