diff --git a/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts b/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts
index 3232c702dfd..c52d6656013 100644
--- a/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts
+++ b/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts
@@ -4,7 +4,7 @@
 // missing-Orca-env path, so their writer may break there.
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { spawn } from 'node:child_process'
-import { existsSync, mkdtempSync, readFileSync, readdirSync, rmSync, writeFileSync } from 'node:fs'
+import { mkdtempSync, readFileSync, readdirSync, rmSync, writeFileSync } from 'node:fs'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import type { SFTPWrapper } from 'ssh2'
@@ -30,25 +30,6 @@ afterEach(() => {
   rmSync(isolatedUserDataDir, { recursive: true, force: true })
 })
 
-function findGitBash(): string {
-  if (process.env.KIMI_SHELL_PATH) {
-    return process.env.KIMI_SHELL_PATH
-  }
-  const candidates = [
-    process.env.ProgramFiles && join(process.env.ProgramFiles, 'Git', 'bin', 'bash.exe'),
-    process.env['ProgramFiles(x86)'] &&
-      join(process.env['ProgramFiles(x86)'], 'Git', 'bin', 'bash.exe'),
-    process.env.LOCALAPPDATA && join(process.env.LOCALAPPDATA, 'Programs', 'Git', 'bin', 'bash.exe')
-  ]
-  const bash = candidates.find((candidate): candidate is string =>
-    Boolean(candidate && existsSync(candidate))
-  )
-  if (!bash) {
-    throw new Error('Git Bash is required for the Windows Kimi hook lifecycle test')
-  }
-  return bash
-}
-
 const { homedirMock } = vi.hoisted(() => ({
   homedirMock: vi.fn<() => string>()
 }))
@@ -84,6 +65,7 @@ import { wrapPosixHookCommand, wrapWindowsHookCommand } from './installer-utils'
 import { POSIX_HOOK_STDIN_READER } from './hook-stdin-contract'
 import { wrapRuntimeHomeHookCommand } from './runtime-home-hook-command'
 import { createAgentHookMemorySftp } from './agent-hook-memory-sftp.test-fixture'
+import { findGitBash } from './windows-git-bash-path.test-fixture'
 
 const REMOTE_HOME = '/home/dev'
 const LARGE_PAYLOAD = Buffer.alloc(1_000_000, 'x')
diff --git a/src/main/agent-hooks/windows-git-bash-path.test-fixture.ts b/src/main/agent-hooks/windows-git-bash-path.test-fixture.ts
new file mode 100644
index 00000000000..9bef35da989
--- /dev/null
+++ b/src/main/agent-hooks/windows-git-bash-path.test-fixture.ts
@@ -0,0 +1,23 @@
+import { existsSync } from 'node:fs'
+import { join } from 'node:path'
+
+// Why: Windows hook tests must run the registered command through MSYS too — it
+// rewrites switches and paths, so a launcher can pass under cmd.exe and fail here.
+export function findGitBash(): string {
+  if (process.env.KIMI_SHELL_PATH) {
+    return process.env.KIMI_SHELL_PATH
+  }
+  const candidates = [
+    process.env.ProgramFiles && join(process.env.ProgramFiles, 'Git', 'bin', 'bash.exe'),
+    process.env['ProgramFiles(x86)'] &&
+      join(process.env['ProgramFiles(x86)'], 'Git', 'bin', 'bash.exe'),
+    process.env.LOCALAPPDATA && join(process.env.LOCALAPPDATA, 'Programs', 'Git', 'bin', 'bash.exe')
+  ]
+  const bash = candidates.find((candidate): candidate is string =>
+    Boolean(candidate && existsSync(candidate))
+  )
+  if (!bash) {
+    throw new Error('Git Bash is required for the Windows managed hook tests')
+  }
+  return bash
+}
diff --git a/src/main/agent-hooks/windows-hook-payload-delivery.test.ts b/src/main/agent-hooks/windows-hook-payload-delivery.test.ts
new file mode 100644
index 00000000000..aabf2545172
--- /dev/null
+++ b/src/main/agent-hooks/windows-hook-payload-delivery.test.ts
@@ -0,0 +1,205 @@
+// Why: 1.4.184 registered `conhost.exe --headless <cmd> /d /c <script>` as the Windows
+// launcher. conhost is the ConPTY server, not a no-window wrapper: it re-hosts the child
+// on a pseudoconsole, so the JSON Claude Code pipes in never reaches the script and the
+// curl POST carries no payload. Shape, exit-code and stdout assertions all stayed green
+// through it, because none of them ever piped a payload. This suite pipes one and follows
+// it to the listener, so a launcher that takes stdin away from the hook fails here (#14818).
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { spawn } from 'node:child_process'
+import { createServer, type Server } from 'node:http'
+import { mkdtempSync, readFileSync, rmSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import type * as osModule from 'node:os'
+
+const { homedirMock } = vi.hoisted(() => ({
+  homedirMock: vi.fn<() => string>()
+}))
+
+vi.mock('electron', () => ({
+  app: {
+    getPath: () => '/tmp/orca-user-data'
+  }
+}))
+
+vi.mock('os', async (importOriginal) => {
+  const actual = await importOriginal<typeof osModule>()
+  return {
+    ...actual,
+    homedir: homedirMock.mockImplementation(actual.homedir)
+  }
+})
+
+import { ClaudeHookService } from '../claude/hook-service'
+import { getConfigPath, getWindowsManagedLifecycleHook } from '../claude/hook-settings'
+import { findGitBash } from './windows-git-bash-path.test-fixture'
+
+const PANE_KEY = 'tab-1:leaf-1'
+const HOOK_TOKEN = 'payload-delivery-token'
+// Why: exercise the sizes and bytes a real hook carries — a multi-KB body crosses the pipe
+// in several chunks, and non-ASCII catches a launcher that recodes stdin through a code page.
+const PAYLOAD = JSON.stringify({
+  session_id: 'a3f9c1e0-payload-delivery',
+  hook_event_name: 'PreToolUse',
+  tool_name: 'Bash',
+  tool_input: { command: 'echo "café 日本語 😀" & echo %PATH% | more' },
+  transcript: 'y'.repeat(4096)
+})
+
+type HookPost = { payload: string | null; paneKey: string | null; token: string | null }
+
+async function startHookListener(): Promise<{
+  server: Server
+  port: number
+  posts: HookPost[]
+}> {
+  const posts: HookPost[] = []
+  const server = createServer((req, res) => {
+    let body = ''
+    req.setEncoding('utf8')
+    req.on('data', (chunk) => {
+      body += chunk
+    })
+    req.on('end', () => {
+      const form = new URLSearchParams(body)
+      posts.push({
+        payload: form.get('payload'),
+        paneKey: form.get('paneKey'),
+        token: req.headers['x-orca-agent-hook-token'] as string | null
+      })
+      res.writeHead(200, { 'content-type': 'application/json' })
+      res.end('{}')
+    })
+  })
+  const port = await new Promise<number>((resolve) => {
+    server.listen(0, '127.0.0.1', () => {
+      const address = server.address()
+      resolve(typeof address === 'object' && address ? address.port : 0)
+    })
+  })
+  return { server, port, posts }
+}
+
+type HookRun = { exitCode: number | null; stdout: string; stderr: string; timedOut: boolean }
+
+function runHookCommand(
+  executable: string,
+  args: string[],
+  env: NodeJS.ProcessEnv
+): Promise<HookRun> {
+  return new Promise((resolve, reject) => {
+    const child = spawn(executable, args, {
+      stdio: ['pipe', 'pipe', 'pipe'],
+      windowsHide: true,
+      env
+    })
+    let stdout = ''
+    let stderr = ''
+    let timedOut = false
+    // Why: Claude Code abandons a hook at 10s, so a launcher that strands the payload reads
+    // as a timeout to the user; fail the same way instead of hanging the suite.
+    const timer = setTimeout(() => {
+      timedOut = true
+      child.kill('SIGKILL')
+    }, 15_000)
+    child.on('error', (error) => {
+      clearTimeout(timer)
+      reject(error)
+    })
+    child.stdout.on('data', (chunk: Buffer) => {
+      stdout += chunk.toString()
+    })
+    child.stderr.on('data', (chunk: Buffer) => {
+      stderr += chunk.toString()
+    })
+    child.on('close', (exitCode) => {
+      clearTimeout(timer)
+      // Why: curl exits once the POST is written; give the listener a beat to finish reading it.
+      setTimeout(() => resolve({ exitCode, stdout, stderr, timedOut }), 250)
+    })
+    child.stdin.end(Buffer.from(PAYLOAD, 'utf8'))
+  })
+}
+
+function hookEnvironment(extra: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
+  const base = Object.fromEntries(
+    Object.entries(process.env).filter(([key]) => !key.startsWith('ORCA_'))
+  )
+  return { ...base, ...extra }
+}
+
+describe('Windows managed hook launcher', () => {
+  // Why: runs on every platform — the live delivery test below can only run on Windows, so
+  // this keeps a ConPTY host from being reintroduced unnoticed by a POSIX-only CI leg.
+  it('does not re-host the hook on a pseudoconsole', () => {
+    const hook = getWindowsManagedLifecycleHook(
+      'C:\\Users\\alice\\.orca\\agent-hooks\\claude-hook.cmd'
+    )
+    expect(hook.command).not.toMatch(/conhost/i)
+    expect(hook.args).toBeUndefined()
+  })
+})
+
+describe.skipIf(process.platform !== 'win32')('Windows managed hook payload delivery', () => {
+  let home = ''
+  let server: Server | null = null
+
+  afterEach(() => {
+    server?.close()
+    server = null
+    homedirMock.mockImplementation(() => process.env.HOME ?? tmpdir())
+    if (home) {
+      rmSync(home, { recursive: true, force: true })
+      home = ''
+    }
+  })
+
+  it('delivers the piped payload to the hook listener through cmd.exe and Git Bash', async () => {
+    home = mkdtempSync(join(tmpdir(), 'orca-hook-payload-'))
+    homedirMock.mockReturnValue(home)
+    expect(new ClaudeHookService().install().state).toBe('installed')
+
+    const settings = JSON.parse(readFileSync(getConfigPath(), 'utf8')) as {
+      hooks: Record<string, { hooks: { command: string }[] }[]>
+    }
+    // Why: assert nothing about the launcher's shape here — this test's whole value is
+    // that it fails for any launcher that loses the payload, named conhost or not.
+    const registeredCommand = settings.hooks.PreToolUse[0].hooks[0].command
+
+    const listener = await startHookListener()
+    server = listener.server
+    const env = hookEnvironment({
+      USERPROFILE: home,
+      HOME: home,
+      ORCA_AGENT_HOOK_PORT: String(listener.port),
+      ORCA_AGENT_HOOK_TOKEN: HOOK_TOKEN,
+      ORCA_PANE_KEY: PANE_KEY
+    })
+
+    const shells = [
+      { name: 'cmd.exe', executable: 'cmd.exe', args: ['/d', '/c', registeredCommand] },
+      { name: 'Git Bash', executable: findGitBash(), args: ['-c', registeredCommand] }
+    ]
+    for (const shell of shells) {
+      const before = listener.posts.length
+      const result = await runHookCommand(shell.executable, shell.args, env)
+      expect(result.timedOut, `${shell.name} timed out`).toBe(false)
+      expect(result.exitCode, `${shell.name} exit code`).toBe(0)
+
+      // Why: assert delivery before stdout so a launcher that swallows the payload fails
+      // on the symptom users report, not on some downstream difference in what it printed.
+      const posts = listener.posts.slice(before)
+      expect(posts, `${shell.name} posted exactly one hook`).toHaveLength(1)
+      // Why: byte-exact, not "non-empty" — a pseudoconsole host delivers nothing, and a
+      // code-page-translating launcher delivers a corrupted body that still looks posted.
+      expect(posts[0].payload, `${shell.name} payload`).toBe(PAYLOAD)
+      expect(posts[0].paneKey, `${shell.name} paneKey`).toBe(PANE_KEY)
+      expect(posts[0].token, `${shell.name} token`).toBe(HOOK_TOKEN)
+
+      expect(result.stderr, `${shell.name} stderr`).toBe('')
+      // Why: compat consumers gate the tool call on parseable stdout (#14818).
+      expect(result.stdout.trim(), `${shell.name} stdout`).toBe('{}')
+    }
+    // Why: two shell launches plus a real install can overrun the default under load.
+  }, 60_000)
+})