diff --git a/src/main/ipc/pty/host-env/assembly.ts b/src/main/ipc/pty/host-env/assembly.ts
index 3c65796b250..dcf7f3fad29 100644
--- a/src/main/ipc/pty/host-env/assembly.ts
+++ b/src/main/ipc/pty/host-env/assembly.ts
@@ -160,7 +160,10 @@ export function buildPtyHostEnv(
 
     if (shouldPrepareOmpShadow) {
       const ompEnv = piTitlebarExtensionService.buildPtyEnv(id, preexistingOmpAgentDir, 'omp', {
-        materializeDefaultHome: explicitPiAgentKind === 'omp'
+        materializeDefaultHome: explicitPiAgentKind === 'omp',
+        ...(baseEnv.PI_CONFIG_DIR !== undefined && !opts.isWsl
+          ? { configDirName: baseEnv.PI_CONFIG_DIR }
+          : {})
       })
       Object.assign(baseEnv, ompEnv)
       exposePiManagedExtensionEnv(baseEnv, 'omp', ompEnv)
diff --git a/src/main/ipc/pty/host-env/omp-launch-environment.test.ts b/src/main/ipc/pty/host-env/omp-launch-environment.test.ts
new file mode 100644
index 00000000000..3700ccf7287
--- /dev/null
+++ b/src/main/ipc/pty/host-env/omp-launch-environment.test.ts
@@ -0,0 +1,77 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { inheritOmpLaunchEnvironment } from './omp-launch-environment'
+import { resolveLoginShellEnvironment } from '../../../startup/login-shell-environment'
+
+vi.mock('../../../startup/login-shell-environment', () => ({
+  resolveLoginShellEnvironment: vi.fn()
+}))
+
+beforeEach(() => {
+  vi.stubGlobal('process', { ...process, platform: 'darwin', env: {} })
+  vi.mocked(resolveLoginShellEnvironment).mockReset().mockResolvedValue({
+    XDG_DATA_HOME: '/login/data',
+    XDG_STATE_HOME: '/login/state',
+    XDG_CACHE_HOME: '/login/cache',
+    PI_CONFIG_DIR: '.config/omp',
+    PI_CODING_AGENT_DIR: '/pi/override',
+    UNRELATED: 'ignore'
+  })
+})
+afterEach(() => vi.unstubAllGlobals())
+
+describe('OMP launch directory environment', () => {
+  it.each([{ launchAgent: 'omp' }, { launchCommand: 'omp' }, {}])(
+    'inherits login-shell category roots for %j',
+    async (options) => {
+      const env = {}
+      await inheritOmpLaunchEnvironment(env, options)
+      expect(env).toEqual({
+        XDG_DATA_HOME: '/login/data',
+        XDG_STATE_HOME: '/login/state',
+        XDG_CACHE_HOME: '/login/cache',
+        PI_CONFIG_DIR: '.config/omp'
+      })
+    }
+  )
+
+  it('uses the same login roots for merged local env and daemon pane deltas', async () => {
+    const local = { XDG_DATA_HOME: '/old/data', PI_CONFIG_DIR: '.old-omp' }
+    const daemon = {}
+    await inheritOmpLaunchEnvironment(local, { launchAgent: 'omp', explicitEnv: {} })
+    await inheritOmpLaunchEnvironment(daemon, { launchAgent: 'omp' })
+    expect(local).toEqual(daemon)
+    expect(local.XDG_DATA_HOME).toBe('/login/data')
+    const overridden = { XDG_DATA_HOME: '/old/data' }
+    await inheritOmpLaunchEnvironment(overridden, {
+      launchAgent: 'omp',
+      explicitEnv: { XDG_DATA_HOME: '/pane/data' }
+    })
+    expect(overridden.XDG_DATA_HOME).toBe('/pane/data')
+  })
+
+  it('preserves explicit pane roots and intentionally empty values', async () => {
+    const env = { XDG_DATA_HOME: '/pane/data', XDG_STATE_HOME: '' }
+    await inheritOmpLaunchEnvironment(env, { launchAgent: 'omp' })
+    expect(env.XDG_DATA_HOME).toBe('/pane/data')
+    expect(env.XDG_STATE_HOME).toBe('')
+  })
+
+  it.each([
+    { isWsl: true, launchAgent: 'omp' },
+    { launchAgent: 'pi' },
+    { launchAgent: 'claude' },
+    { launchCommand: 'pi' },
+    { launchCommand: 'npm test' }
+  ])('does not probe a different execution environment for %j', async (options) => {
+    const env = {}
+    await inheritOmpLaunchEnvironment(env, options)
+    expect(env).toEqual({})
+    expect(resolveLoginShellEnvironment).not.toHaveBeenCalled()
+  })
+
+  it('does not import POSIX roots into native Windows', async () => {
+    vi.stubGlobal('process', { ...process, platform: 'win32' })
+    await inheritOmpLaunchEnvironment({}, { launchAgent: 'omp' })
+    expect(resolveLoginShellEnvironment).not.toHaveBeenCalled()
+  })
+})
diff --git a/src/main/ipc/pty/host-env/omp-launch-environment.ts b/src/main/ipc/pty/host-env/omp-launch-environment.ts
new file mode 100644
index 00000000000..55408e94c39
--- /dev/null
+++ b/src/main/ipc/pty/host-env/omp-launch-environment.ts
@@ -0,0 +1,38 @@
+import { detectExplicitPiAgentKindFromCommand } from '../../../../shared/pi-agent-kind'
+import { resolveSetupAgentSequenceLaunchCommand } from '../../../../shared/setup-agent-sequencing'
+import { resolveLoginShellEnvironment } from '../../../startup/login-shell-environment'
+
+const OMP_DIRECTORY_ENV_KEYS = [
+  'XDG_CONFIG_HOME',
+  'XDG_DATA_HOME',
+  'XDG_STATE_HOME',
+  'XDG_CACHE_HOME',
+  'PI_CONFIG_DIR'
+] as const
+
+export async function inheritOmpLaunchEnvironment(
+  env: Record<string, string>,
+  options: {
+    isWsl?: boolean
+    launchAgent?: string
+    launchCommand?: string
+    explicitEnv?: Record<string, string>
+  }
+): Promise<void> {
+  if (options.isWsl || process.platform === 'win32') {
+    return
+  }
+  const command = resolveSetupAgentSequenceLaunchCommand(env, options.launchCommand)
+  const agent = options.launchAgent ?? detectExplicitPiAgentKindFromCommand(command)
+  if (agent !== 'omp' && (options.launchAgent !== undefined || command?.trim())) {
+    return
+  }
+  const shellEnv = await resolveLoginShellEnvironment()
+  for (const key of OMP_DIRECTORY_ENV_KEYS) {
+    // Explicit pane values, including empty values, take precedence over the login shell.
+    const value = (options.explicitEnv ?? env)[key] ?? shellEnv[key] ?? process.env[key]
+    if (value !== undefined) {
+      env[key] = value
+    }
+  }
+}
diff --git a/src/main/ipc/pty/ipc/spawn-env-codex.ts b/src/main/ipc/pty/ipc/spawn-env-codex.ts
index b01dfa997e2..e17e21cf5cd 100644
--- a/src/main/ipc/pty/ipc/spawn-env-codex.ts
+++ b/src/main/ipc/pty/ipc/spawn-env-codex.ts
@@ -1,3 +1,4 @@
+import { inheritOmpLaunchEnvironment } from '../host-env/omp-launch-environment'
 import { getAppEnvironment } from '../../../../shared/app-environment'
 import { isTuiAgent } from '../../../../shared/tui-agent-config'
 import { isAgentStatusHooksEnabled } from '../../../agent-hooks/managed-agent-hook-controls'
@@ -133,6 +134,11 @@ export async function assemblePtyIpcSpawnCodexEnv(ctx: PtyIpcSpawnState): Promis
     // Why: clone before mutating so injections don't leak back into args.env (renderer may reuse it).
     ctx.env = { ...ctx.baseEnv }
     try {
+      await inheritOmpLaunchEnvironment(ctx.env, {
+        isWsl: shouldSkipCodexHomeEnvForWindowsShell(ctx.effectiveShellOverride, ctx.cwd),
+        launchAgent: args.launchAgent,
+        launchCommand: ctx.launchCommand
+      })
       buildPtyHostEnv(sessionIdForEnv, ctx.env, {
         isPackaged: getAppEnvironment().isPackaged(),
         resourcesPath: process.resourcesPath,
diff --git a/src/main/ipc/pty/provider/local-configure.ts b/src/main/ipc/pty/provider/local-configure.ts
index 68f3b7c0723..f0f1bc78f67 100644
--- a/src/main/ipc/pty/provider/local-configure.ts
+++ b/src/main/ipc/pty/provider/local-configure.ts
@@ -1,3 +1,4 @@
+import { inheritOmpLaunchEnvironment } from '../host-env/omp-launch-environment'
 import { getAppEnvironment } from '../../../../shared/app-environment'
 import type { OrcaRuntimeService } from '../../../runtime/orca-runtime'
 import type { GlobalSettings } from '../../../../shared/global-settings-types'
@@ -55,6 +56,12 @@ export function configureLocalPtyProvider(args: {
       )
       const skipCodexHomeEnv = ctx?.isWsl === true && !selectedCodexHomePath
       const ptySettings = getSettings?.()
+      await inheritOmpLaunchEnvironment(baseEnv, {
+        explicitEnv: ctx?.explicitEnv,
+        isWsl: ctx?.isWsl,
+        launchAgent: ctx?.launchAgent,
+        launchCommand: ctx?.command
+      })
       const env = buildPtyHostEnv(id, baseEnv, {
         isPackaged: getAppEnvironment().isPackaged(),
         resourcesPath: process.resourcesPath,
diff --git a/src/main/ipc/pty/runtime/spawn-preflight.ts b/src/main/ipc/pty/runtime/spawn-preflight.ts
index a37ede4b3e8..1209730ed6d 100644
--- a/src/main/ipc/pty/runtime/spawn-preflight.ts
+++ b/src/main/ipc/pty/runtime/spawn-preflight.ts
@@ -1,3 +1,4 @@
+import { inheritOmpLaunchEnvironment } from '../host-env/omp-launch-environment'
 import { getAppEnvironment } from '../../../../shared/app-environment'
 import type { PtySpawnResult } from '../../../providers/types'
 import { LocalPtyProvider } from '../../../providers/local-pty-provider'
@@ -258,6 +259,12 @@ export async function prepareRuntimePtySpawn(
       throw new Error('Invalid PTY session id')
     }
     try {
+      ctx.env ??= {}
+      await inheritOmpLaunchEnvironment(ctx.env, {
+        isWsl: shouldSkipCodexHomeEnvForWindowsShell(ctx.daemonShellOverride, ctx.cwd),
+        launchAgent: args.launchAgent,
+        launchCommand: ctx.launchCommand
+      })
       ctx.env = buildPtyHostEnv(ctx.sessionId, ctx.env ?? {}, {
         isPackaged: getAppEnvironment().isPackaged(),
         resourcesPath: process.resourcesPath,
diff --git a/src/main/pi/titlebar-extension-service.test.ts b/src/main/pi/titlebar-extension-service.test.ts
index 69884d6591b..435fb5ac91f 100644
--- a/src/main/pi/titlebar-extension-service.test.ts
+++ b/src/main/pi/titlebar-extension-service.test.ts
@@ -98,6 +98,59 @@ describe('PiTitlebarExtensionService', () => {
     rmSync(join(userDataDir, 'omp-managed-status-extension'), { recursive: true, force: true })
   })
 
+  it.each([
+    ['pi', '.pi', 'ORCA_PI_SOURCE_AGENT_DIR'],
+    ['omp', '.omp', 'ORCA_OMP_SOURCE_AGENT_DIR'],
+    ['prime-agent', '.prime', 'ORCA_PRIME_AGENT_SOURCE_AGENT_DIR']
+  ] as const)('does not reinterpret XDG data as %s configuration', (kind, root, sourceKey) => {
+    const fakeHome = mkdtempSync(join(tmpdir(), 'orca-agent-xdg-'))
+    const dataHome = join(fakeHome, 'data')
+    const dataAgentDir = join(dataHome, root.slice(1), 'agent')
+    mkdirSync(dataAgentDir, { recursive: true })
+    homedirOverride.current = fakeHome
+    vi.stubEnv('XDG_DATA_HOME', dataHome)
+    try {
+      const env = new PiTitlebarExtensionService().buildPtyEnv('pty-xdg', undefined, kind)
+      expect(env[sourceKey]).toBe(join(fakeHome, root, 'agent'))
+      expect(readdirSync(dataAgentDir)).toEqual([])
+      expect(env.PI_CODING_AGENT_DIR).toBeUndefined()
+    } finally {
+      vi.unstubAllEnvs()
+      homedirOverride.current = ''
+      rmSync(fakeHome, { recursive: true, force: true })
+    }
+  })
+
+  it('materializes OMP extensions under the launch config root without overriding data routing', () => {
+    const fakeHome = mkdtempSync(join(tmpdir(), 'orca-omp-config-'))
+    homedirOverride.current = fakeHome
+    try {
+      const service = new PiTitlebarExtensionService()
+      const environment = { PI_CONFIG_DIR: '.config/omp', XDG_DATA_HOME: join(fakeHome, 'data') }
+      const env = service.buildPtyEnv('pty-config', undefined, 'omp', {
+        configDirName: environment.PI_CONFIG_DIR
+      })
+      const agentDir = join(fakeHome, '.config', 'omp', 'agent')
+      expect(env.ORCA_OMP_SOURCE_AGENT_DIR).toBe(agentDir)
+      expect(existsSync(join(agentDir, 'extensions', 'orca-agent-status.ts'))).toBe(true)
+      expect(env.PI_CODING_AGENT_DIR).toBeUndefined()
+      expect(existsSync(join(fakeHome, '.omp'))).toBe(false)
+      expect(existsSync(environment.XDG_DATA_HOME)).toBe(false)
+      expect(
+        service.buildPtyEnv('pty-explicit', piHome, 'omp', {
+          configDirName: environment.PI_CONFIG_DIR
+        }).ORCA_OMP_SOURCE_AGENT_DIR
+      ).toBe(piHome)
+      expect(
+        service.buildPtyEnv('pty-pi', undefined, 'pi', { configDirName: environment.PI_CONFIG_DIR })
+          .ORCA_PI_SOURCE_AGENT_DIR
+      ).toBe(join(fakeHome, '.pi', 'agent'))
+    } finally {
+      homedirOverride.current = ''
+      rmSync(fakeHome, { recursive: true, force: true })
+    }
+  })
+
   function expectPiHomeIntact(): void {
     expect(readFileSync(join(piHome, 'auth.json'), 'utf-8')).toBe('secret token')
     expect(readFileSync(join(piHome, 'skills', 'my-skill', 'SKILL.md'), 'utf-8')).toBe(
diff --git a/src/main/pi/titlebar-extension-service.ts b/src/main/pi/titlebar-extension-service.ts
index 8a093096f4e..3ab0a253ad4 100644
--- a/src/main/pi/titlebar-extension-service.ts
+++ b/src/main/pi/titlebar-extension-service.ts
@@ -58,8 +58,9 @@ const AGENT_HOME_DIR_NAME: Record<PiAgentKind, string> = {
   'prime-agent': '.prime'
 }
 
-function getDefaultPiAgentDir(kind: PiAgentKind): string {
-  return join(homedir(), AGENT_HOME_DIR_NAME[kind], PI_AGENT_SUBDIR)
+function getDefaultPiAgentDir(kind: PiAgentKind, configDirName: string | undefined): string {
+  const root = kind === 'omp' ? configDirName || AGENT_HOME_DIR_NAME.omp : AGENT_HOME_DIR_NAME[kind]
+  return join(homedir(), root, PI_AGENT_SUBDIR)
 }
 
 function toSafeOverlayDirName(ptyId: string): string {
@@ -177,9 +178,11 @@ export class PiTitlebarExtensionService {
     ptyId: string,
     existingAgentDir: string | undefined,
     kind: PiAgentKind,
-    options?: { materializeDefaultHome?: boolean }
+    options?: { materializeDefaultHome?: boolean; configDirName?: string }
   ): Record<string, string> {
-    const sourceAgentDir = existingAgentDir || getDefaultPiAgentDir(kind)
+    const sourceAgentDir =
+      existingAgentDir ||
+      getDefaultPiAgentDir(kind, options?.configDirName ?? process.env.PI_CONFIG_DIR)
     if (kind !== 'prime-agent') {
       try {
         this.safeRemoveOverlay(this.getPtyOverlayDir(ptyId, kind), kind)
diff --git a/src/main/providers/local-pty-provider-spawn-env.test.ts b/src/main/providers/local-pty-provider-spawn-env.test.ts
index 8dc45d40aa8..daf6286b56d 100644
--- a/src/main/providers/local-pty-provider-spawn-env.test.ts
+++ b/src/main/providers/local-pty-provider-spawn-env.test.ts
@@ -179,6 +179,18 @@ describe('LocalPtyProvider', () => {
       )
     })
 
+    it('passes explicit pane environment separately from inherited process values', async () => {
+      const buildSpawnEnv = vi.fn((_id: string, env: Record<string, string>) => env)
+      provider.configure({ buildSpawnEnv })
+      const env = { XDG_DATA_HOME: '/pane/data' }
+      await provider.spawn({ cols: 80, rows: 24, env })
+      expect(buildSpawnEnv).toHaveBeenCalledWith(
+        expect.any(String),
+        expect.any(Object),
+        expect.objectContaining({ explicitEnv: env })
+      )
+    })
+
     it('invokes buildSpawnEnv callback to customize environment', async () => {
       const buildSpawnEnv = vi.fn((_id: string, env: Record<string, string>) => {
         env.CUSTOM_VAR = 'custom-value'
diff --git a/src/main/providers/local-pty-provider-types.ts b/src/main/providers/local-pty-provider-types.ts
index 0bebff54237..ebe90bbb049 100644
--- a/src/main/providers/local-pty-provider-types.ts
+++ b/src/main/providers/local-pty-provider-types.ts
@@ -7,6 +7,7 @@ export type LocalPtyProviderOptions = {
     id: string,
     baseEnv: Record<string, string>,
     ctx?: {
+      explicitEnv?: PtySpawnOptions['env']
       command?: string
       launchAgent?: PtySpawnOptions['launchAgent']
       codexHomePathOverride?: PtySpawnOptions['codexHomePathOverride']
diff --git a/src/main/providers/local-pty-spawn-environment.ts b/src/main/providers/local-pty-spawn-environment.ts
index 39b56c4d99f..2413dd12b10 100644
--- a/src/main/providers/local-pty-spawn-environment.ts
+++ b/src/main/providers/local-pty-spawn-environment.ts
@@ -61,6 +61,7 @@ export function buildLocalPtySpawnEnvironment(args: {
   return awaitCancelableLocalPtySpawn(
     id,
     getOptions().buildSpawnEnv!(id, spawnEnv, {
+      explicitEnv: spawn.env ?? {},
       command: spawn.command,
       launchAgent: spawn.launchAgent,
       codexHomePathOverride: spawn.codexHomePathOverride,
diff --git a/tests/e2e/omp-launch-environment.spec.ts b/tests/e2e/omp-launch-environment.spec.ts
new file mode 100644
index 00000000000..63f352a8391
--- /dev/null
+++ b/tests/e2e/omp-launch-environment.spec.ts
@@ -0,0 +1,231 @@
+import { chmod, mkdir, readFile, readdir, writeFile } from 'node:fs/promises'
+import { dirname, delimiter, join } from 'node:path'
+import { test as base, expect } from './helpers/orca-app'
+import { buildShellCommandFromArgv } from '../../src/shared/tui-agent-startup-shell'
+import { ensureTerminalVisible, waitForActiveWorktree, waitForSessionReady } from './helpers/store'
+import {
+  execInTerminal,
+  waitForActivePanePtyId,
+  waitForActiveTerminalManager
+} from './helpers/terminal'
+
+const test = base.extend({
+  launchEnv: async ({ seedTestRepo }, run, testInfo) => {
+    void seedTestRepo
+    const shell = testInfo.outputPath('login-shell')
+    const profileDir = testInfo.outputPath('profile')
+    await mkdir(profileDir, { recursive: true })
+    await writeFile(
+      join(profileDir, '.zprofile'),
+      `
+export PI_CONFIG_DIR="\${PI_CONFIG_DIR:-.omp-profile-proof}"
+export XDG_DATA_HOME="\${XDG_DATA_HOME:-$HOME/xdg-data}"
+export XDG_STATE_HOME="\${XDG_STATE_HOME:-$HOME/xdg-state}"
+export XDG_CACHE_HOME="\${XDG_CACHE_HOME:-$HOME/xdg-cache}"
+mkdir -p "$HOME/$PI_CONFIG_DIR/agent" "$XDG_DATA_HOME/omp" "$XDG_STATE_HOME/omp" "$XDG_CACHE_HOME/omp"
+`
+    )
+    await writeFile(
+      shell,
+      `#!/bin/sh
+case "$ORCA_E2E_HOME_DIR" in
+  */orca-e2e-userdata-*/home) ;;
+  *) echo 'Refusing profile proof outside isolated E2E home' >&2; exit 73 ;;
+esac
+export HOME="$ORCA_E2E_HOME_DIR"
+export ZDOTDIR=${buildShellCommandFromArgv([profileDir], 'posix')}
+exec /bin/zsh "$@"
+`
+    )
+    await chmod(shell, 0o700)
+    await run({
+      PATH: [dirname(process.env.ORCA_OMP_PROOF_BINARY ?? '/usr/bin/omp'), process.env.PATH]
+        .filter(Boolean)
+        .join(delimiter),
+      SHELL: shell,
+      XDG_DATA_HOME: undefined,
+      XDG_STATE_HOME: undefined,
+      XDG_CACHE_HOME: undefined,
+      XDG_CONFIG_HOME: undefined,
+      PI_CONFIG_DIR: undefined
+    })
+  }
+})
+
+test('OMP launched by Orca uses login-profile data and config roots', async ({
+  orcaPage,
+  electronApp
+}, testInfo) => {
+  test.skip(
+    !process.env.ORCA_OMP_PROOF_BINARY || process.platform !== 'darwin',
+    'Opt-in macOS OMP runtime proof'
+  )
+  await waitForSessionReady(orcaPage)
+  const worktreeId = await waitForActiveWorktree(orcaPage)
+  await ensureTerminalVisible(orcaPage)
+  await waitForActiveTerminalManager(orcaPage)
+  const ptyId = await waitForActivePanePtyId(orcaPage)
+  const home = await electronApp.evaluate(({ app }) => app.getPath('home'))
+  expect(await electronApp.evaluate(() => process.env.XDG_DATA_HOME)).toBeUndefined()
+  const result = testInfo.outputPath('omp-paths.json')
+  const probe = testInfo.outputPath('path-probe.ts')
+  await writeFile(
+    probe,
+    `import { writeFileSync } from 'node:fs'
+export default function (api) {
+ api.on('session_start', (_event, ctx) => {
+  writeFileSync(process.env.ORCA_PATH_PROBE_OUTPUT || ${JSON.stringify(result)}, JSON.stringify({
+   data: process.env.XDG_DATA_HOME, config: process.env.PI_CONFIG_DIR,
+   source: process.env.ORCA_OMP_SOURCE_AGENT_DIR,
+   status: process.env.ORCA_OMP_STATUS_EXTENSION,
+   session: ctx.sessionManager.getSessionFile(), pid: process.pid
+  }))
+ })
+}`
+  )
+  await execInTerminal(
+    orcaPage,
+    ptyId,
+    buildShellCommandFromArgv(['omp', '--no-extensions', '--extension', probe], 'posix')
+  )
+  await expect
+    .poll(
+      async () => {
+        try {
+          return JSON.parse(await readFile(result, 'utf8'))
+        } catch {
+          return null
+        }
+      },
+      { timeout: 45_000 }
+    )
+    .toEqual(
+      expect.objectContaining({
+        data: join(home, 'xdg-data'),
+        config: '.omp-profile-proof',
+        source: join(home, '.omp-profile-proof', 'agent'),
+        status: expect.stringContaining(join('.omp-profile-proof', 'agent', 'extensions')),
+        session: expect.stringContaining(join('xdg-data', 'omp', 'sessions'))
+      })
+    )
+  await expect(orcaPage.locator('.xterm-screen').first()).toBeVisible()
+  await orcaPage.screenshot({ path: testInfo.outputPath('omp-profile-root.png') })
+  expect(await readdir(join(home, 'xdg-data', 'omp'))).toContain('agent.db')
+  const overrideData = join(home, 'pane-data')
+  await mkdir(join(overrideData, 'omp'), { recursive: true })
+  const overrideResult = testInfo.outputPath('omp-pane-paths.json')
+  const overridePty = await orcaPage.evaluate(
+    async ({ command, worktreeId, home, overrideData, overrideResult }) => {
+      const pane = await window.api.pty.spawn({
+        cols: 100,
+        rows: 30,
+        cwd: home,
+        worktreeId,
+        initiallyHidden: true,
+        launchAgent: 'omp',
+        command,
+        env: {
+          XDG_DATA_HOME: overrideData,
+          PI_CONFIG_DIR: '.omp-pane-config',
+          ORCA_PATH_PROBE_OUTPUT: overrideResult
+        }
+      })
+      return pane.id
+    },
+    {
+      command: buildShellCommandFromArgv(['omp', '--no-extensions', '--extension', probe], 'posix'),
+      worktreeId,
+      home,
+      overrideData,
+      overrideResult
+    }
+  )
+  try {
+    await expect
+      .poll(
+        async () => {
+          try {
+            return JSON.parse(await readFile(overrideResult, 'utf8'))
+          } catch {
+            return null
+          }
+        },
+        { timeout: 45_000 }
+      )
+      .toEqual(
+        expect.objectContaining({
+          data: overrideData,
+          config: '.omp-pane-config',
+          source: join(home, '.omp-pane-config', 'agent'),
+          session: expect.stringContaining(join('pane-data', 'omp', 'sessions'))
+        })
+      )
+    expect(await readdir(join(overrideData, 'omp'))).toContain('agent.db')
+  } finally {
+    await orcaPage.evaluate((id) => window.api.pty.kill(id), overridePty)
+  }
+  const baselineResult = testInfo.outputPath('omp-login-baseline.json')
+  const baselineCommand = buildShellCommandFromArgv(
+    [
+      'env',
+      ...[
+        'XDG_DATA_HOME',
+        'XDG_STATE_HOME',
+        'XDG_CACHE_HOME',
+        'PI_CONFIG_DIR',
+        'ORCA_OMP_SOURCE_AGENT_DIR',
+        'ORCA_OMP_STATUS_EXTENSION',
+        'ORCA_PI_STATUS_OWNED',
+        'ZDOTDIR',
+        'ORCA_ORIG_ZDOTDIR'
+      ].flatMap((key) => ['-u', key]),
+      `ORCA_PATH_PROBE_OUTPUT=${baselineResult}`,
+      `HOME=${home}`,
+      `ZDOTDIR=${testInfo.outputPath('profile')}`,
+      '/bin/zsh',
+      '-ilc',
+      buildShellCommandFromArgv(
+        [process.env.ORCA_OMP_PROOF_BINARY ?? '', '--no-extensions', '--extension', probe],
+        'posix'
+      )
+    ],
+    'posix'
+  )
+  const baselinePty = await orcaPage.evaluate(
+    async ({ command, worktreeId, home }) => {
+      return (
+        await window.api.pty.spawn({
+          cols: 100,
+          rows: 30,
+          cwd: home,
+          worktreeId,
+          initiallyHidden: true,
+          command
+        })
+      ).id
+    },
+    { command: baselineCommand, worktreeId, home }
+  )
+  try {
+    await expect
+      .poll(
+        async () => {
+          try {
+            return JSON.parse(await readFile(baselineResult, 'utf8'))
+          } catch {
+            return null
+          }
+        },
+        { timeout: 45_000 }
+      )
+      .toEqual(
+        expect.objectContaining({
+          data: join(home, 'xdg-data'),
+          config: '.omp-profile-proof',
+          session: expect.stringContaining(join('xdg-data', 'omp', 'sessions'))
+        })
+      )
+  } finally {
+    await orcaPage.evaluate((id) => window.api.pty.kill(id), baselinePty)
+  }
+})