diff --git a/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.i18n.yaml b/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.i18n.yaml
new file mode 100644
index 0000000000..4edd7b7223
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.i18n.yaml
@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write
+2026-07-20-windows-tui-support.md: 6b728486dd50faac067933ce06f883447aae821f
+2026-07-20-windows-tui-support.zh.md: 2b53b05ff6231361d79b4304181dc0e6d8e24e68
diff --git a/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.md b/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.md
new file mode 100644
index 0000000000..6b728486dd
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.md
@@ -0,0 +1,33 @@
+# Agent Note: Support the TUI on Windows
+
+Status: implemented
+
+English | [中文](2026-07-20-windows-tui-support.zh.md)
+
+## Problem
+
+The full-screen TUI delegates raw input, ANSI rendering, resize events, and terminal restoration to pi-tui's `ProcessTerminal`. That dependency contains a native Windows console path, but the repository's real-process smoke used Python's POSIX-only `pty` and `termios` modules. Skipping that smoke on Windows would leave the supported product path without coverage for startup, input, interaction, failure reporting, or restoration.
+
+The TUI platform contract must follow the runtime shipped to users rather than the portability of one test driver. A platform exclusion is justified only when the product has an unsupported runtime dependency or a demonstrated semantic gap.
+
+## Decision
+
+[`@deepseek-ai/dsh-tui`](../../../../packages/ui/tui/README.md) supports interactive terminals on Windows as well as macOS and Linux. The product continues to use pi-tui's `ProcessTerminal`; on Windows it enables virtual-terminal input after raw mode and avoids the Unix-only `SIGWINCH` refresh. DeepSeek Harness adds no platform rejection or reduced Windows mode.
+
+The real Loader smoke selects a native pseudo-terminal boundary by host. macOS and Linux retain the Python POSIX PTY driver. Windows uses `node-pty` and ConPTY. Both drivers receive the same launch command, environment, terminal dimensions, marker-gated input actions, timeout, expected exit code, and output assertions, and all three smoke scenarios run on every supported platform.
+
+`node-pty` is a test-only dependency of the examples workspace. Its reviewed native install script is explicitly enabled in `pnpm-workspace.yaml`; production TUI packages do not acquire a new dependency or subprocess layer.
+
+## Alternatives considered
+
+- **Declare the TUI unsupported on Windows** — rejected because the pinned terminal runtime implements Windows console input explicitly and the harness has no POSIX-only production dependency. A documentation-only exclusion would discard an existing product path to accommodate a test harness gap.
+- **Run the POSIX driver through MSYS, Cygwin, or WSL** — rejected because that would test a compatibility environment rather than the native Windows console path users run.
+- **Use `node-pty` on every host** — rejected because the established POSIX driver already provides the macOS and Linux boundary; replacing it would widen the runtime change without improving those hosts. Platform-specific drivers reserve the `node-pty` runtime path for Windows while sharing one scenario contract.
+- **Rely on renderer unit tests and semantic terminal snapshots** — rejected because fake terminals do not prove Loader boot, real raw input, process exit, or terminal restoration at the operating-system boundary.
+
+## Consequences
+
+- The Windows artifact lane executes the startup, scripted interaction, resume-failure, and restoration scenarios, and the suite has no supported-platform skip.
+- The Windows process proof depends on ConPTY and a pinned `node-pty` release; changing that dependency or its allowed install script requires native-boundary review.
+- The two PTY drivers can differ internally, but shared inputs and assertions keep their observable TUI contract aligned.
+- Windows support remains bounded by the Node and pi-tui versions shipped by the repository; unsupported historical Windows console environments do not receive a compatibility layer.
diff --git a/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.zh.md b/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.zh.md
new file mode 100644
index 0000000000..2b53b05ff6
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-07-20-windows-tui-support.zh.md
@@ -0,0 +1,33 @@
+# Agent Note: 在 Windows 上支持 TUI
+
+Status: implemented
+
+[English](2026-07-20-windows-tui-support.md) | 中文
+
+## 问题
+
+全屏 TUI 将原始输入、ANSI 渲染、终端尺寸变更事件和终端恢复委托给 pi-tui 的 `ProcessTerminal`。该依赖已实现原生 Windows 控制台路径，但仓库的真实进程冒烟测试此前使用 Python 中仅适用于 POSIX 的 `pty` 和 `termios` 模块。若在 Windows 上跳过该测试，这条受支持的产品路径便会缺少针对启动、输入、交互、失败报告和终端恢复的测试覆盖率。
+
+TUI 平台契约必须以交付给用户的运行时为准，而不是取决于某个测试驱动程序的可移植性。只有产品存在不受支持的运行时依赖，或已证实存在语义缺口时，排除某个平台才有依据。
+
+## 决策
+
+[`@deepseek-ai/dsh-tui`](../../../../packages/ui/tui/README.md) 在 Windows、macOS 和 Linux 上均支持交互式终端。产品继续使用 pi-tui 的 `ProcessTerminal`；在 Windows 上，它会在进入原始模式后启用虚拟终端输入，并避开仅适用于 Unix 的 `SIGWINCH` 刷新。DeepSeek Harness 不增加平台拒绝逻辑，也不采用功能受限的 Windows 模式。
+
+真实 Loader 冒烟测试根据宿主选择原生伪终端边界。macOS 和 Linux 继续使用 Python POSIX PTY 驱动，Windows 则使用 `node-pty` 和 ConPTY。两种驱动接收相同的启动命令、环境、终端尺寸、以标记为触发条件的输入动作、超时、预期退出码和输出断言；3 个冒烟场景都会在每个受支持平台上运行。
+
+`node-pty` 是 examples 工作区仅供测试使用的依赖。该依赖经评审的原生安装脚本在 `pnpm-workspace.yaml` 中显式启用；生产 TUI 包（package）不会新增依赖或子进程层。
+
+## 曾考虑的替代方案
+
+- **声明 TUI 不支持 Windows**：不予采纳，因为固定版本的终端运行时已显式实现 Windows 控制台输入，且 harness 没有仅适用于 POSIX 的生产依赖。仅通过文档排除 Windows，等于为迁就测试 harness 的缺口而舍弃现有产品路径。
+- **通过 MSYS、Cygwin 或 WSL 运行 POSIX 驱动**：不予采纳，因为这会测试兼容环境，而不是用户实际运行的原生 Windows 控制台路径。
+- **在所有宿主上使用 `node-pty`**：不予采纳，因为现有 POSIX 驱动已经为 macOS 和 Linux 提供所需边界；替换该驱动会扩大运行时变更范围，却不会给这两个宿主带来改进。按平台选择驱动，仅在 Windows 上启用 `node-pty` 运行时路径，同时共享同一份场景契约。
+- **依赖渲染器单元测试和语义终端快照**：不予采纳，因为模拟终端无法证明 Loader 启动、真实原始输入、进程退出或操作系统边界上的终端恢复。
+
+## 后果
+
+- Windows 产物 lane 执行启动、脚本化交互、配置恢复失败和终端恢复场景，这套测试不会在任何受支持平台上跳过。
+- Windows 进程级验证依赖 ConPTY 和固定版本的 `node-pty`；变更该依赖或允许执行的安装脚本时，必须进行原生边界评审。
+- 两种 PTY 驱动的内部实现可以不同，但共享的输入和断言会使其可观测 TUI 契约保持一致。
+- Windows 支持范围以仓库交付的 Node 和 pi-tui 版本为界；不受支持的旧版 Windows 控制台环境不会获得兼容层。
diff --git a/examples/package.json b/examples/package.json
index 53c392cd4c..f9956c498d 100644
--- a/examples/package.json
+++ b/examples/package.json
@@ -50,5 +50,8 @@
     "@deepseek-ai/dsh-web": "workspace:*",
     "@deepseek-ai/dsh-web-fetch-local": "workspace:*",
     "@deepseek-ai/dsh-workflow-workerthread": "workspace:*"
+  },
+  "devDependencies": {
+    "node-pty": "1.1.0"
   }
 }
diff --git a/examples/tui-agent/tests/pty-harness.ts b/examples/tui-agent/tests/pty-harness.ts
index 21d0b4c9d7..116f7cc9a1 100644
--- a/examples/tui-agent/tests/pty-harness.ts
+++ b/examples/tui-agent/tests/pty-harness.ts
@@ -2,9 +2,9 @@ import { spawn } from 'node:child_process'
 import { mkdtemp, rm } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
-import { resolveExampleLaunch } from '@deepseek-ai/dsh-loader-smoke'
+import { resolveExampleLaunch, type ExampleLaunch } from '@deepseek-ai/dsh-loader-smoke'
 
-const PTY_DRIVER = String.raw`
+const POSIX_PTY_DRIVER = String.raw`
 import errno, json, os, pty, select, signal, sys, time
 node, launch_args_json, launch_env_json, cwd, actions_json, expected_exit, timeout_seconds = sys.argv[1:]
 env = os.environ.copy()
@@ -71,9 +71,103 @@ export interface TuiPtySmokeOptions {
   readonly timeoutMs?: number
 }
 
+function definedEnv(env: NodeJS.ProcessEnv): Record<string, string> {
+  return Object.fromEntries(
+    Object.entries(env).filter((entry): entry is [string, string] => entry[1] !== undefined),
+  )
+}
+
+async function runPosixPtySmoke(
+  launch: ExampleLaunch,
+  cwd: string,
+  options: TuiPtySmokeOptions,
+  timeoutMs: number,
+): Promise<string> {
+  return await new Promise((resolve, reject) => {
+    const child = spawn('python3', [
+      '-c',
+      POSIX_PTY_DRIVER,
+      launch.command,
+      JSON.stringify(launch.args),
+      JSON.stringify(launch.env),
+      cwd,
+      JSON.stringify(options.actions ?? []),
+      String(options.expectedExitCode ?? 0),
+      String(timeoutMs / 1_000),
+    ], { stdio: ['ignore', 'pipe', 'pipe'] })
+    let stdout = ''
+    let stderr = ''
+    child.stdout.setEncoding('utf8')
+    child.stdout.on('data', (chunk: string) => { stdout += chunk })
+    child.stderr.setEncoding('utf8')
+    child.stderr.on('data', (chunk: string) => { stderr += chunk })
+    const timer = setTimeout(() => {
+      child.kill('SIGKILL')
+      reject(new Error(`${options.label} PTY driver did not exit. stdout:\n${stdout}\nstderr:\n${stderr}`))
+    }, timeoutMs + 5_000)
+    child.once('error', (error) => { clearTimeout(timer); reject(error) })
+    child.once('exit', (code) => {
+      clearTimeout(timer)
+      if (code === 0) resolve(stdout)
+      else reject(new Error(`${options.label} PTY driver exited ${String(code)}. stdout:\n${stdout}\nstderr:\n${stderr}`))
+    })
+  })
+}
+
+async function runWindowsPtySmoke(
+  launch: ExampleLaunch,
+  cwd: string,
+  options: TuiPtySmokeOptions,
+  timeoutMs: number,
+): Promise<string> {
+  const pty = await import('node-pty')
+  return await new Promise((resolve, reject) => {
+    const actions = options.actions ?? []
+    const expectedExitCode = options.expectedExitCode ?? 0
+    let output = ''
+    let actionIndex = 0
+    let timedOut = false
+    const terminal = pty.spawn(launch.command, launch.args, {
+      name: 'xterm-256color',
+      cols: 100,
+      rows: 30,
+      cwd,
+      env: definedEnv({
+        ...process.env,
+        ...launch.env,
+        COLUMNS: '100',
+        LINES: '30',
+      }),
+    })
+    const timer = setTimeout(() => {
+      timedOut = true
+      terminal.kill()
+    }, timeoutMs)
+    terminal.onData((chunk) => {
+      output += chunk
+      while (actionIndex < actions.length && output.includes(actions[actionIndex]!.waitFor)) {
+        terminal.write(actions[actionIndex]!.send)
+        actionIndex += 1
+      }
+    })
+    terminal.onExit(({ exitCode, signal }) => {
+      clearTimeout(timer)
+      if (timedOut) {
+        reject(new Error(`${options.label} PTY process did not exit before ${String(timeoutMs)}ms. output:\n${output}`))
+      } else if (actionIndex !== actions.length) {
+        reject(new Error(`${options.label} completed ${String(actionIndex)}/${String(actions.length)} PTY actions. output:\n${output}`))
+      } else if (exitCode !== expectedExitCode) {
+        reject(new Error(`${options.label} expected exit ${String(expectedExitCode)}, got ${String(exitCode)} (signal ${String(signal)}). output:\n${output}`))
+      } else {
+        resolve(output)
+      }
+    })
+  })
+}
+
 /**
- * Boot an example in a real pseudo-terminal, drive marker-gated input, and
- * return the captured terminal bytes after the expected process exit.
+ * Boot an example in a real pseudo-terminal (ConPTY on Windows), drive
+ * marker-gated input, and return captured bytes after the expected process exit.
  * @param options - launch paths, environment, actions, and expected exit code.
  * @returns complete pseudo-terminal output.
  */
@@ -92,35 +186,10 @@ export async function runTuiPtySmoke(options: TuiPtySmokeOptions): Promise<strin
         ...options.env,
       },
     })
-    return await new Promise((resolve, reject) => {
-      const child = spawn('python3', [
-        '-c',
-        PTY_DRIVER,
-        launch.command,
-        JSON.stringify(launch.args),
-        JSON.stringify(launch.env),
-        cwd,
-        JSON.stringify(options.actions ?? []),
-        String(options.expectedExitCode ?? 0),
-        String(timeoutMs / 1_000),
-      ], { stdio: ['ignore', 'pipe', 'pipe'] })
-      let stdout = ''
-      let stderr = ''
-      child.stdout.setEncoding('utf8')
-      child.stdout.on('data', (chunk: string) => { stdout += chunk })
-      child.stderr.setEncoding('utf8')
-      child.stderr.on('data', (chunk: string) => { stderr += chunk })
-      const timer = setTimeout(() => {
-        child.kill('SIGKILL')
-        reject(new Error(`${options.label} PTY driver did not exit. stdout:\n${stdout}\nstderr:\n${stderr}`))
-      }, timeoutMs + 5_000)
-      child.once('error', (error) => { clearTimeout(timer); reject(error) })
-      child.once('exit', (code) => {
-        clearTimeout(timer)
-        if (code === 0) resolve(stdout)
-        else reject(new Error(`${options.label} PTY driver exited ${String(code)}. stdout:\n${stdout}\nstderr:\n${stderr}`))
-      })
-    })
+    if (process.platform === 'win32') {
+      return await runWindowsPtySmoke(launch, cwd, options, timeoutMs)
+    }
+    return await runPosixPtySmoke(launch, cwd, options, timeoutMs)
   } finally {
     await rm(cwd, { recursive: true, force: true })
   }
diff --git a/examples/tui-agent/tests/tui-keyless-smoke.e2e.ts b/examples/tui-agent/tests/tui-keyless-smoke.e2e.ts
index 21be35eef5..e2fa7377c6 100644
--- a/examples/tui-agent/tests/tui-keyless-smoke.e2e.ts
+++ b/examples/tui-agent/tests/tui-keyless-smoke.e2e.ts
@@ -8,8 +8,7 @@ const configPath = fileURLToPath(new URL('../cordis.yml', import.meta.url))
 const scriptedConfigPath = fileURLToPath(new URL('./fixtures/tui-scripted.cordis.yml', import.meta.url))
 const tsconfigPath = fileURLToPath(new URL('../../../tsconfig.json', import.meta.url))
 
-// The Python PTY driver imports the POSIX-only pty and termios modules.
-describe.skipIf(process.platform === 'win32')('tui-agent keyless smoke (real Loader tree in a PTY)', () => {
+describe('tui-agent keyless smoke (real Loader tree in a PTY)', () => {
   it('boots pi-tui, renders the configured banner, accepts /exit, and restores the terminal', async () => {
     const output = await runTuiPtySmoke({
       label: 'tui-agent boot',
diff --git a/packages/ui/tui/README.md b/packages/ui/tui/README.md
index f44644c430..328bc3e55a 100644
--- a/packages/ui/tui/README.md
+++ b/packages/ui/tui/README.md
@@ -4,6 +4,8 @@ The interactive terminal front door for DeepSeek Harness agents, built on [`@ear
 
 The implemented [TUI feature Agent Note](../../../.agents/notes/implemented/feature/2026-07-17-dedicated-full-screen-tui-front-door.md) owns the front-door decision; the [terminal-state snapshot Agent Note](../../../.agents/notes/implemented/testing/2026-07-18-tui-terminal-state-snapshots.md) owns its verification strategy.
 
+Interactive terminals on macOS, Linux, and Windows are supported. Windows uses pi-tui's native console VT-input handling, and the [Windows support Agent Note](../../../.agents/notes/implemented/feature/2026-07-20-windows-tui-support.md) owns the platform decision and ConPTY process verification.
+
 This package owns interactive terminal presentation and input only. It injects `agents`, `tools`, and `userInteraction`, then drives an agent created or resumed by app or developer code. Agent lifecycle, persistence, and the model-facing [`ask_user_question`](../tool-ask-user/README.md) tool remain separate composition entries.
 
 The TUI rebuilds resumed history from the active session surface, renders Markdown responses and reasoning, applies each tool's `presentCall` / `presentResult` intent to terminal, diff, or generic cards, keeps the latest `todo/write` plan above the editor, and presents `ctx.userInteraction` questions as keyboard-driven overlays. Surface replacement events rebuild the transcript so compacted history does not reappear.
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index f1c3c84521..977f5afb28 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -227,6 +227,10 @@ importers:
       '@deepseek-ai/dsh-workflow-workerthread':
         specifier: workspace:*
         version: link:../packages/workflow/workflow-workerthread
+    devDependencies:
+      node-pty:
+        specifier: 1.1.0
+        version: 1.1.0
 
   packages/bash/bash:
     devDependencies:
@@ -6179,6 +6183,9 @@ packages:
   neo-async@2.6.2:
     resolution: {integrity: sha512-Yd3UES5mWCSqR+qNT93S3UoYUkqAZ9lLg8a7g9rimsWmYGK8cVToA4/sF3RrshdyV3sAGMXVUmpMYOw+dLpOuw==}
 
+  node-addon-api@7.1.1:
+    resolution: {integrity: sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==}
+
   node-addon-landlock-run-linux-arm64@0.0.0-test.0:
     resolution: {integrity: sha512-oJsXcC33qKl9mWYx0n9YPJ2pUAoY39PoIX0Gx4lDrSCTEvENFrEaODAsQYNY+eEGpn9YMN7E+FOftvea3/1FqQ==}
     engines: {node: '>=20'}
@@ -6256,6 +6263,9 @@ packages:
     resolution: {integrity: sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==}
     engines: {node: ^12.20.0 || ^14.13.1 || >=16.0.0}
 
+  node-pty@1.1.0:
+    resolution: {integrity: sha512-20JqtutY6JPXTUnL0ij1uad7Qe1baT46lyolh2sSENDd4sTzKZ4nmAFkeAARDKwmlLjPx6XKRlwRUxwjOy+lUg==}
+
   non-layered-tidy-tree-layout@2.0.2:
     resolution: {integrity: sha512-gkXMxRzUH+PB0ax9dUN0yYF0S25BqeAYqhgMaLUFmpXLEk7Fcu8f4emJuOAY0V8kjDICxROIKsTAKsV/v355xw==}
 
@@ -10605,6 +10615,8 @@ snapshots:
 
   neo-async@2.6.2: {}
 
+  node-addon-api@7.1.1: {}
+
   node-addon-landlock-run-linux-arm64@0.0.0-test.0:
     optional: true
 
@@ -10673,6 +10685,10 @@ snapshots:
       fetch-blob: 3.2.0
       formdata-polyfill: 4.0.10
 
+  node-pty@1.1.0:
+    dependencies:
+      node-addon-api: 7.1.1
+
   non-layered-tidy-tree-layout@2.0.2:
     optional: true
 
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 26bfaeeb0b..55947e1131 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -25,6 +25,8 @@ peerDependencyRules:
 allowBuilds:
   esbuild: true
   lefthook: true
+  # Cross-platform PTY boundary for the TUI process smoke, including ConPTY on Windows.
+  node-pty: true
   # Pulled in by @earendil-works/pi-ai (optional LLM API backend). pnpm lists
   # them only because they ship lifecycle scripts, but those are no-ops we don't
   # need, so we deny them — install still succeeds.