diff --git a/src/main/__fixtures__/shell-wrapper-snapshots/daemon-bash-rcfile.txt b/src/main/__fixtures__/shell-wrapper-snapshots/daemon-bash-rcfile.txt
index 235a1cd579c..882ec9afeb1 100644
--- a/src/main/__fixtures__/shell-wrapper-snapshots/daemon-bash-rcfile.txt
+++ b/src/main/__fixtures__/shell-wrapper-snapshots/daemon-bash-rcfile.txt
@@ -42,7 +42,7 @@ if [[ -n "${ORCA_DATA_ACCOUNT_DATA_HOME:-}" ]]; then
     export OPENCODE_DB="opencode.db"
   fi
 fi
-[[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"
+[[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"
 # Why: OMP does not auto-load Orca's managed status extension; wrap only
 # interactive launch invocations so subcommands such as `omp config` keep
 # their normal argv shape.
diff --git a/src/main/__fixtures__/shell-wrapper-snapshots/daemon-zsh-zshenv.txt b/src/main/__fixtures__/shell-wrapper-snapshots/daemon-zsh-zshenv.txt
index a3fc8a9caeb..e605b40ebcd 100644
--- a/src/main/__fixtures__/shell-wrapper-snapshots/daemon-zsh-zshenv.txt
+++ b/src/main/__fixtures__/shell-wrapper-snapshots/daemon-zsh-zshenv.txt
@@ -118,7 +118,7 @@ __orca_deferred_init() {
         export OPENCODE_DB="opencode.db"
       fi
     fi
-    [[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"
+    [[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"
     # Why: OMP does not auto-load Orca's managed status extension; wrap only
     # interactive launch invocations so subcommands such as `omp config` keep
     # their normal argv shape.
diff --git a/src/main/__fixtures__/shell-wrapper-snapshots/local-bash-rcfile.txt b/src/main/__fixtures__/shell-wrapper-snapshots/local-bash-rcfile.txt
index 08c4705d1af..d8ba9ce90de 100644
--- a/src/main/__fixtures__/shell-wrapper-snapshots/local-bash-rcfile.txt
+++ b/src/main/__fixtures__/shell-wrapper-snapshots/local-bash-rcfile.txt
@@ -50,7 +50,7 @@ if [[ -n "${ORCA_DATA_ACCOUNT_DATA_HOME:-}" ]]; then
     export OPENCODE_DB="opencode.db"
   fi
 fi
-[[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"
+[[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"
 # Why: OMP does not auto-load Orca's managed status extension; wrap only
 # interactive launch invocations so subcommands such as `omp config` keep
 # their normal argv shape.
diff --git a/src/main/__fixtures__/shell-wrapper-snapshots/local-zsh-zshenv.txt b/src/main/__fixtures__/shell-wrapper-snapshots/local-zsh-zshenv.txt
index 4267902cad6..63c76dcc739 100644
--- a/src/main/__fixtures__/shell-wrapper-snapshots/local-zsh-zshenv.txt
+++ b/src/main/__fixtures__/shell-wrapper-snapshots/local-zsh-zshenv.txt
@@ -125,7 +125,7 @@ __orca_deferred_init() {
         export OPENCODE_DB="opencode.db"
       fi
     fi
-    [[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"
+    [[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"
     # Why: OMP does not auto-load Orca's managed status extension; wrap only
     # interactive launch invocations so subcommands such as `omp config` keep
     # their normal argv shape.
diff --git a/src/main/__fixtures__/shell-wrapper-snapshots/relay-bash-rcfile.txt b/src/main/__fixtures__/shell-wrapper-snapshots/relay-bash-rcfile.txt
index e9cc47d8361..894f53fd4ce 100644
--- a/src/main/__fixtures__/shell-wrapper-snapshots/relay-bash-rcfile.txt
+++ b/src/main/__fixtures__/shell-wrapper-snapshots/relay-bash-rcfile.txt
@@ -24,7 +24,7 @@ fi
 [[ $- == *i* ]] && bind 'set enable-bracketed-paste on' 2>/dev/null
 # Why: remote startup files can re-export user defaults after relay spawn.
 [[ -n "${ORCA_OPENCODE_CONFIG_DIR:-}" ]] && export OPENCODE_CONFIG_DIR="${ORCA_OPENCODE_CONFIG_DIR}"
-[[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"
+[[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"
 [[ -n "${ORCA_REMOTE_CLI_BIN_DIR:-}" ]] && case ":$PATH:" in *:"${ORCA_REMOTE_CLI_BIN_DIR}":*) ;; *) export PATH="${ORCA_REMOTE_CLI_BIN_DIR}:$PATH" ;; esac
 if [ -n "${ORCA_CLI_BIN_DIR:-}" ]; then
   case "${PATH:-}" in
diff --git a/src/main/__fixtures__/shell-wrapper-snapshots/relay-zsh-zshenv.txt b/src/main/__fixtures__/shell-wrapper-snapshots/relay-zsh-zshenv.txt
index d17479e64ae..57ec4bbef5a 100644
--- a/src/main/__fixtures__/shell-wrapper-snapshots/relay-zsh-zshenv.txt
+++ b/src/main/__fixtures__/shell-wrapper-snapshots/relay-zsh-zshenv.txt
@@ -100,7 +100,7 @@ __orca_deferred_init() {
         export OPENCODE_DB="opencode.db"
       fi
     fi
-    [[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"
+    [[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"
     [[ -n "${ORCA_REMOTE_CLI_BIN_DIR:-}" ]] && case ":$PATH:" in *:"${ORCA_REMOTE_CLI_BIN_DIR}":*) ;; *) export PATH="${ORCA_REMOTE_CLI_BIN_DIR}:$PATH" ;; esac
     # Why: OMP does not auto-load Orca's managed status extension; wrap only
     # interactive launch invocations so subcommands such as `omp config` keep
diff --git a/src/main/daemon/daemon-bash-shell-ready-rcfile.ts b/src/main/daemon/daemon-bash-shell-ready-rcfile.ts
index f43b53d4485..e5c13faa4ff 100644
--- a/src/main/daemon/daemon-bash-shell-ready-rcfile.ts
+++ b/src/main/daemon/daemon-bash-shell-ready-rcfile.ts
@@ -37,7 +37,7 @@ ${ORCA_CLI_POSIX_PATH_RESTORE}
 # Restore the managed OpenCode config after user profiles may have replaced it.
 [[ -n "\${ORCA_OPENCODE_CONFIG_DIR:-}" ]] && export OPENCODE_CONFIG_DIR="\${ORCA_OPENCODE_CONFIG_DIR}"
 ${MANAGED_DATA_ACCOUNT_POSIX_RESTORE}
-[[ -n "\${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="\${ORCA_MIMOCODE_HOME}"
+[[ -n "\${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="\${ORCA_MIMOCODE_CONFIG_DIR}"
 ${getPosixOmpShellWrapper()}
 # Preserve the managed CODEX_HOME after user profiles.
 [[ -n "\${ORCA_CODEX_HOME:-}" ]] && export CODEX_HOME="\${ORCA_CODEX_HOME}"
diff --git a/src/main/daemon/pty-subprocess-managed-agent-env.test.ts b/src/main/daemon/pty-subprocess-managed-agent-env.test.ts
index 5ccfc4c35f7..d0532860263 100644
--- a/src/main/daemon/pty-subprocess-managed-agent-env.test.ts
+++ b/src/main/daemon/pty-subprocess-managed-agent-env.test.ts
@@ -151,8 +151,8 @@ describe('createPtySubprocess', () => {
         rows: 24,
         env: {
           SHELL: '/bin/zsh',
-          MIMOCODE_HOME: '/tmp/orca-mimocode-overlay',
-          ORCA_MIMOCODE_HOME: '/tmp/orca-mimocode-overlay'
+          MIMOCODE_CONFIG_DIR: '/tmp/orca-mimocode-overlay',
+          ORCA_MIMOCODE_CONFIG_DIR: '/tmp/orca-mimocode-overlay'
         }
       })
     } finally {
diff --git a/src/main/daemon/pty-subprocess-test-harness.ts b/src/main/daemon/pty-subprocess-test-harness.ts
index 9b8b70ca1aa..c33386b86eb 100644
--- a/src/main/daemon/pty-subprocess-test-harness.ts
+++ b/src/main/daemon/pty-subprocess-test-harness.ts
@@ -7,7 +7,7 @@ import { join } from 'node:path'
 
 const ORCA_SHELL_WRAPPER_ENV = [
   'ORCA_OPENCODE_CONFIG_DIR',
-  'ORCA_MIMOCODE_HOME',
+  'ORCA_MIMOCODE_CONFIG_DIR',
   'ORCA_PI_CODING_AGENT_DIR',
   'ORCA_OMP_CODING_AGENT_DIR',
   'ORCA_OMP_STATUS_EXTENSION',
diff --git a/src/main/daemon/shell-ready.test.ts b/src/main/daemon/shell-ready.test.ts
index 2c8b29e8c4a..7b026a63263 100644
--- a/src/main/daemon/shell-ready.test.ts
+++ b/src/main/daemon/shell-ready.test.ts
@@ -552,7 +552,7 @@ describePosix('daemon shell-ready launch config', () => {
     const restoreLine =
       '[[ -n "${ORCA_OPENCODE_CONFIG_DIR:-}" ]] && export OPENCODE_CONFIG_DIR="${ORCA_OPENCODE_CONFIG_DIR}"'
     const mimoRestoreLine =
-      '[[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"'
+      '[[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"'
     const codexRestoreLine =
       '[[ -n "${ORCA_CODEX_HOME:-}" ]] && export CODEX_HOME="${ORCA_CODEX_HOME}"'
     const agentTeamsPathRestoreLine = '[[ -n "${ORCA_AGENT_TEAMS_SHIM_DIR:-}" ]] || return 0'
diff --git a/src/main/ipc/pty-ipc-mock-registry.ts b/src/main/ipc/pty-ipc-mock-registry.ts
index b2dff12df7a..63e362851c3 100644
--- a/src/main/ipc/pty-ipc-mock-registry.ts
+++ b/src/main/ipc/pty-ipc-mock-registry.ts
@@ -123,9 +123,10 @@ export const openCodeHookServiceModuleMock = () => ({
 })
 
 export const mimoHookServiceModuleMock = (): {
-  mimoCodeHookService: { buildPtyEnv: Mock }
+  mimoCodeHookService: { carryOverLegacyAuth: Mock; buildPtyEnv: Mock }
 } => ({
   mimoCodeHookService: {
+    carryOverLegacyAuth: vi.fn(),
     buildPtyEnv: mimoCodeBuildPtyEnvMock
   }
 })
diff --git a/src/main/ipc/pty-ipc-suite-environment.ts b/src/main/ipc/pty-ipc-suite-environment.ts
index b1e32e7347f..dff8253b2c7 100644
--- a/src/main/ipc/pty-ipc-suite-environment.ts
+++ b/src/main/ipc/pty-ipc-suite-environment.ts
@@ -221,8 +221,10 @@ export function createPtyIpcSuiteEnvironment(): PtyIpcSuiteEnvironment {
         ? '/tmp/orca-opencode2-overlay'
         : '/tmp/orca-opencode2-config'
     }))
-    mimoCodeBuildPtyEnvMock.mockImplementation((_ptyId: string, existingHome?: string) => ({
-      MIMOCODE_HOME: existingHome ? '/tmp/orca-mimocode-overlay' : '/tmp/orca-mimocode-shared'
+    mimoCodeBuildPtyEnvMock.mockImplementation((_ptyId: string, existingConfigDir?: string) => ({
+      MIMOCODE_CONFIG_DIR: existingConfigDir
+        ? '/tmp/orca-mimocode-overlay'
+        : '/tmp/orca-mimocode-shared'
     }))
     buildAgentHookEnvMock.mockReturnValue({
       ORCA_AGENT_HOOK_PORT: '5678',
diff --git a/src/main/ipc/pty/host-env/assembly.ts b/src/main/ipc/pty/host-env/assembly.ts
index b8c3d997d94..3db762dc17f 100644
--- a/src/main/ipc/pty/host-env/assembly.ts
+++ b/src/main/ipc/pty/host-env/assembly.ts
@@ -26,7 +26,7 @@ import {
   clearPiAgentShadowEnv,
   exposePiManagedExtensionEnv,
   isMimoLaunchCommand,
-  resolveMimocodeSourceHome,
+  resolveMimocodeSourceConfigDir,
   resolvePiAgentSourceDir,
   resolveScopedPiAgentSourceDir
 } from './pi-agent'
@@ -100,25 +100,29 @@ export function buildPtyHostEnv(
     opts,
     launchCommandHint
   )
-  if (opts.agentStatusHooksEnabled) {
-    if (isMimoLaunchCommand(launchCommandHint)) {
-      const preexistingMimocodeHome = resolveMimocodeSourceHome(baseEnv)
-      Object.assign(baseEnv, mimoCodeHookService.buildPtyEnv(id, preexistingMimocodeHome))
-      if (baseEnv.MIMOCODE_HOME) {
-        baseEnv.ORCA_MIMOCODE_HOME = baseEnv.MIMOCODE_HOME
-        if (preexistingMimocodeHome) {
-          baseEnv.ORCA_MIMOCODE_SOURCE_HOME = preexistingMimocodeHome
-        } else {
-          delete baseEnv.ORCA_MIMOCODE_SOURCE_HOME
-        }
+  // Older builds redirected MIMOCODE_HOME; a nested pane must not inherit that overlay.
+  restoreOrStripOverlayEnv(baseEnv, {
+    primary: 'MIMOCODE_HOME',
+    overlay: 'ORCA_MIMOCODE_HOME',
+    source: 'ORCA_MIMOCODE_SOURCE_HOME'
+  })
+  restoreOrStripOverlayEnv(baseEnv, {
+    primary: 'MIMOCODE_CONFIG_DIR',
+    overlay: 'ORCA_MIMOCODE_CONFIG_DIR',
+    source: 'ORCA_MIMOCODE_SOURCE_CONFIG_DIR',
+    preserveExplicitPrimary: true
+  })
+  const mimoSourceConfigDir = resolveMimocodeSourceConfigDir(baseEnv)
+  if (opts.agentStatusHooksEnabled && isMimoLaunchCommand(launchCommandHint)) {
+    mimoCodeHookService.carryOverLegacyAuth({ ...process.env, ...baseEnv })
+    const overlay = mimoCodeHookService.buildPtyEnv(id, mimoSourceConfigDir).MIMOCODE_CONFIG_DIR
+    if (overlay && overlay !== mimoSourceConfigDir) {
+      baseEnv.MIMOCODE_CONFIG_DIR = overlay
+      baseEnv.ORCA_MIMOCODE_CONFIG_DIR = overlay
+      if (mimoSourceConfigDir) {
+        baseEnv.ORCA_MIMOCODE_SOURCE_CONFIG_DIR = mimoSourceConfigDir
       }
     }
-  } else {
-    restoreOrStripOverlayEnv(baseEnv, {
-      primary: 'MIMOCODE_HOME',
-      overlay: 'ORCA_MIMOCODE_HOME',
-      source: 'ORCA_MIMOCODE_SOURCE_HOME'
-    })
   }
 
   // Remove inherited hook coordinates before injecting the owning pane's receiver.
diff --git a/src/main/ipc/pty/host-env/pi-agent.ts b/src/main/ipc/pty/host-env/pi-agent.ts
index 917191a7822..e71e0b8f452 100644
--- a/src/main/ipc/pty/host-env/pi-agent.ts
+++ b/src/main/ipc/pty/host-env/pi-agent.ts
@@ -136,7 +136,9 @@ export function getInheritedAgentHookEnvKeysToDelete(
     'ORCA_CLAUDE_CONFIG_DIR',
     'ORCA_OPENCODE_AGENT',
     'ORCA_OPENCODE_CONFIG_DIR',
-    'ORCA_OPENCODE_SOURCE_CONFIG_DIR'
+    'ORCA_OPENCODE_SOURCE_CONFIG_DIR',
+    'ORCA_MIMOCODE_CONFIG_DIR',
+    'ORCA_MIMOCODE_SOURCE_CONFIG_DIR'
   ].filter((key) => env[key] === undefined)
 }
 
@@ -155,17 +157,19 @@ export function isMimoLaunchCommand(launchCommand: string | undefined): boolean
   return getAgentLaunchExecutableName(launchCommand) === 'mimo'
 }
 
-export function resolveMimocodeSourceHome(baseEnv: Record<string, string>): string | undefined {
-  const sourceHome = baseEnv.ORCA_MIMOCODE_SOURCE_HOME ?? process.env.ORCA_MIMOCODE_SOURCE_HOME
-  if (sourceHome) {
-    return sourceHome
+/** Call after the overlay env is restored: an explicit pane value wins over inherited markers. */
+export function resolveMimocodeSourceConfigDir(
+  baseEnv: Record<string, string>,
+  inheritedEnv: NodeJS.ProcessEnv = process.env
+): string | undefined {
+  if (baseEnv.MIMOCODE_CONFIG_DIR) {
+    return baseEnv.MIMOCODE_CONFIG_DIR
   }
-  const configHome = baseEnv.MIMOCODE_HOME ?? process.env.MIMOCODE_HOME
-  const orcaHome = baseEnv.ORCA_MIMOCODE_HOME ?? process.env.ORCA_MIMOCODE_HOME
-  if (configHome && orcaHome && configHome === orcaHome) {
-    return undefined
+  if (inheritedEnv.ORCA_MIMOCODE_SOURCE_CONFIG_DIR) {
+    return inheritedEnv.ORCA_MIMOCODE_SOURCE_CONFIG_DIR
   }
-  return configHome
+  const configDir = inheritedEnv.MIMOCODE_CONFIG_DIR
+  return configDir && configDir === inheritedEnv.ORCA_MIMOCODE_CONFIG_DIR ? undefined : configDir
 }
 
 export function resolveOpenCodeSourceConfigDir(
diff --git a/src/main/ipc/pty/pty-spawn-env-agent-overlays.test.ts b/src/main/ipc/pty/pty-spawn-env-agent-overlays.test.ts
index a81fb90fe14..e8039daaca0 100644
--- a/src/main/ipc/pty/pty-spawn-env-agent-overlays.test.ts
+++ b/src/main/ipc/pty/pty-spawn-env-agent-overlays.test.ts
@@ -264,9 +264,9 @@ describe('registerPtyHandlers', () => {
       const env = await spawnAndGetEnv(undefined, undefined, undefined, undefined, 'mimo')
 
       expect(mimoCodeBuildPtyEnvMock).toHaveBeenCalledTimes(1)
-      expect(env.MIMOCODE_HOME).toBe('/tmp/orca-mimocode-shared')
-      expect(env.ORCA_MIMOCODE_HOME).toBe('/tmp/orca-mimocode-shared')
-      expect(env.ORCA_MIMOCODE_SOURCE_HOME).toBeUndefined()
+      expect(env.MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
+      expect(env.ORCA_MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
+      expect(env.ORCA_MIMOCODE_SOURCE_CONFIG_DIR).toBeUndefined()
     })
     it.each([
       '/usr/local/bin/mimo --prompt hi',
@@ -276,8 +276,8 @@ describe('registerPtyHandlers', () => {
       const env = await spawnAndGetEnv(undefined, undefined, undefined, undefined, launchCommand)
 
       expect(mimoCodeBuildPtyEnvMock).toHaveBeenCalledTimes(1)
-      expect(env.MIMOCODE_HOME).toBe('/tmp/orca-mimocode-shared')
-      expect(env.ORCA_MIMOCODE_HOME).toBe('/tmp/orca-mimocode-shared')
+      expect(env.MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
+      expect(env.ORCA_MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
     })
     it('uses sequenced startup env as the MiMo launch hint when command is a wrapper', async () => {
       const env = await spawnAndGetEnv(
@@ -289,20 +289,20 @@ describe('registerPtyHandlers', () => {
       )
 
       expect(mimoCodeBuildPtyEnvMock).toHaveBeenCalledTimes(1)
-      expect(env.MIMOCODE_HOME).toBe('/tmp/orca-mimocode-shared')
-      expect(env.ORCA_MIMOCODE_HOME).toBe('/tmp/orca-mimocode-shared')
+      expect(env.MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
+      expect(env.ORCA_MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
     })
     it('does not inject MiMo overlay for non-mimo launches', async () => {
       await spawnAndGetEnv()
 
       expect(mimoCodeBuildPtyEnvMock).not.toHaveBeenCalled()
     })
-    it('restores user MiMo home when agent status hooks are disabled in a nested Orca shell', async () => {
+    it('restores user MiMo config dir when agent status hooks are disabled in a nested Orca shell', async () => {
       const env = await spawnAndGetEnv(
         {
-          MIMOCODE_HOME: '/tmp/parent-orca-mimocode-overlay',
-          ORCA_MIMOCODE_HOME: '/tmp/parent-orca-mimocode-overlay',
-          ORCA_MIMOCODE_SOURCE_HOME: '/tmp/user-mimocode-home'
+          MIMOCODE_CONFIG_DIR: '/tmp/parent-orca-mimocode-overlay',
+          ORCA_MIMOCODE_CONFIG_DIR: '/tmp/parent-orca-mimocode-overlay',
+          ORCA_MIMOCODE_SOURCE_CONFIG_DIR: '/tmp/user-mimocode-config'
         },
         undefined,
         undefined,
@@ -311,9 +311,27 @@ describe('registerPtyHandlers', () => {
       )
 
       expect(mimoCodeBuildPtyEnvMock).not.toHaveBeenCalled()
+      expect(env.MIMOCODE_CONFIG_DIR).toBe('/tmp/user-mimocode-config')
+      expect(env.ORCA_MIMOCODE_CONFIG_DIR).toBeUndefined()
+      expect(env.ORCA_MIMOCODE_SOURCE_CONFIG_DIR).toBeUndefined()
+    })
+    it("leaves MiMo's home alone and drops an older build's MIMOCODE_HOME overlay", async () => {
+      const env = await spawnAndGetEnv(
+        {
+          MIMOCODE_HOME: '/tmp/parent-orca-mimocode-home',
+          ORCA_MIMOCODE_HOME: '/tmp/parent-orca-mimocode-home',
+          ORCA_MIMOCODE_SOURCE_HOME: '/tmp/user-mimocode-home'
+        },
+        undefined,
+        undefined,
+        undefined,
+        'mimo'
+      )
+
       expect(env.MIMOCODE_HOME).toBe('/tmp/user-mimocode-home')
       expect(env.ORCA_MIMOCODE_HOME).toBeUndefined()
       expect(env.ORCA_MIMOCODE_SOURCE_HOME).toBeUndefined()
+      expect(env.MIMOCODE_CONFIG_DIR).toBe('/tmp/orca-mimocode-shared')
     })
     posixOnlyIt(
       'reproduces issue #1534: GUI-launched Orca mirrors zshrc-only OpenCode config',
diff --git a/src/main/mimo/hook-service.test.ts b/src/main/mimo/hook-service.test.ts
index f1ef11e3949..82003455e1f 100644
--- a/src/main/mimo/hook-service.test.ts
+++ b/src/main/mimo/hook-service.test.ts
@@ -1,5 +1,15 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
-import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs'
+import {
+  existsSync,
+  mkdirSync,
+  mkdtempSync,
+  readFileSync,
+  readdirSync,
+  rmSync,
+  statSync,
+  symlinkSync,
+  writeFileSync
+} from 'node:fs'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { setAppEnvironment } from '../../shared/app-environment'
@@ -12,7 +22,7 @@ import { MimoCodeHookService } from './hook-service'
 
 describe('MimoCodeHookService buildPtyEnv', () => {
   let userDataDir: string
-  let mimocodeHome: string
+  let userConfigDir: string
 
   beforeEach(() => {
     userDataDir = mkdtempSync(join(tmpdir(), 'orca-mimocode-userdata-'))
@@ -32,53 +42,109 @@ describe('MimoCodeHookService buildPtyEnv', () => {
       getAppMetrics: () => []
     })
 
-    mimocodeHome = mkdtempSync(join(tmpdir(), 'orca-mimocode-home-'))
-    const configDir = join(mimocodeHome, 'config')
-    mkdirSync(join(configDir, 'plugins'), { recursive: true })
-    writeFileSync(join(configDir, 'mimocode.json'), '{"theme":"dark"}')
-    writeFileSync(join(configDir, 'plugins', 'user-plugin.js'), 'export default () => {}')
-    writeFileSync(join(configDir, 'plugins', 'orca-mimocode-status.js'), 'USER PLUGIN')
+    userConfigDir = mkdtempSync(join(tmpdir(), 'orca-mimocode-config-'))
+    mkdirSync(join(userConfigDir, 'plugins'), { recursive: true })
+    writeFileSync(join(userConfigDir, 'mimocode.json'), '{"theme":"dark"}')
+    writeFileSync(join(userConfigDir, 'plugins', 'user-plugin.js'), 'export default () => {}')
+    writeFileSync(join(userConfigDir, 'plugins', 'orca-mimocode-status.js'), 'USER PLUGIN')
   })
 
   afterEach(() => {
     rmSync(userDataDir, { recursive: true, force: true })
-    rmSync(mimocodeHome, { recursive: true, force: true })
+    rmSync(userConfigDir, { recursive: true, force: true })
   })
 
-  it('mirrors user config into shared overlay and installs Orca status plugin', () => {
-    const service = new MimoCodeHookService()
-    const env = service.buildPtyEnv('pty-1', mimocodeHome)
+  // MIMOCODE_HOME also moves auth.json, sessions and state (#9132); only add a config layer.
+  it('sets only MIMOCODE_CONFIG_DIR to a directory holding just the Orca plugin', () => {
+    const env = new MimoCodeHookService().buildPtyEnv('pty-1')
 
-    const overlayHome = join(userDataDir, 'mimocode-hooks', 'shared')
-    expect(env.MIMOCODE_HOME).toBe(overlayHome)
-    expect(readFileSync(join(overlayHome, 'config', 'mimocode.json'), 'utf8')).toBe(
-      '{"theme":"dark"}'
-    )
-    expect(readFileSync(join(overlayHome, 'config', 'plugins', 'user-plugin.js'), 'utf8')).toBe(
-      'export default () => {}'
-    )
-
-    const orcaPlugin = join(overlayHome, 'config', 'plugins', 'orca-mimocode-status.js')
-    expect(existsSync(orcaPlugin)).toBe(true)
-    const pluginSource = readFileSync(orcaPlugin, 'utf8')
+    const overlay = join(userDataDir, 'mimocode-hooks', 'config')
+    expect(env).toEqual({ MIMOCODE_CONFIG_DIR: overlay })
+    expect(readdirSync(overlay)).toEqual(['plugins'])
+    const pluginSource = readFileSync(join(overlay, 'plugins', 'orca-mimocode-status.js'), 'utf8')
     expect(pluginSource).toContain('/hook/mimo-code')
     expect(pluginSource).not.toContain('post("SessionStart"')
-
-    expect(
-      readFileSync(join(mimocodeHome, 'config', 'plugins', 'orca-mimocode-status.js'), 'utf8')
-    ).toBe('USER PLUGIN')
   })
 
-  it('reuses the overlay home on a second buildPtyEnv call', () => {
-    const service = new MimoCodeHookService()
-    const first = service.buildPtyEnv('pty-1', mimocodeHome)
-    const second = service.buildPtyEnv('pty-2', mimocodeHome)
+  it("layers the user's own MIMOCODE_CONFIG_DIR into the overlay without touching it", () => {
+    const env = new MimoCodeHookService().buildPtyEnv('pty-1', userConfigDir)
 
-    const overlayHome = join(userDataDir, 'mimocode-hooks', 'shared')
-    expect(first.MIMOCODE_HOME).toBe(overlayHome)
-    expect(second.MIMOCODE_HOME).toBe(overlayHome)
-    expect(
-      readFileSync(join(overlayHome, 'config', 'plugins', 'orca-mimocode-status.js'), 'utf8')
-    ).toContain('/hook/mimo-code')
+    const overlay = env.MIMOCODE_CONFIG_DIR ?? ''
+    expect(overlay).toContain(join(userDataDir, 'mimocode-hooks', 'config-overlays'))
+    expect(readFileSync(join(overlay, 'mimocode.json'), 'utf8')).toBe('{"theme":"dark"}')
+    expect(readFileSync(join(overlay, 'plugins', 'user-plugin.js'), 'utf8')).toBe(
+      'export default () => {}'
+    )
+    expect(readFileSync(join(overlay, 'plugins', 'orca-mimocode-status.js'), 'utf8')).toContain(
+      '/hook/mimo-code'
+    )
+    expect(readFileSync(join(userConfigDir, 'plugins', 'orca-mimocode-status.js'), 'utf8')).toBe(
+      'USER PLUGIN'
+    )
+  })
+
+  it.skipIf(process.platform === 'win32')(
+    "never writes the Orca plugin through a user's linked plugins folder",
+    () => {
+      const linkedPlugins = mkdtempSync(join(tmpdir(), 'orca-mimocode-linked-plugins-'))
+      writeFileSync(join(linkedPlugins, 'user-plugin.js'), 'export default () => {}')
+      rmSync(join(userConfigDir, 'plugins'), { recursive: true })
+      symlinkSync(linkedPlugins, join(userConfigDir, 'plugins'))
+      try {
+        const env = new MimoCodeHookService().buildPtyEnv('pty-1', userConfigDir)
+
+        expect(existsSync(join(env.MIMOCODE_CONFIG_DIR ?? '', 'plugins', 'user-plugin.js'))).toBe(
+          true
+        )
+        expect(readdirSync(linkedPlugins)).toEqual(['user-plugin.js'])
+      } finally {
+        rmSync(linkedPlugins, { recursive: true, force: true })
+      }
+    }
+  )
+
+  it('carries a login made under the old Orca MIMOCODE_HOME over once, owner-only', () => {
+    const legacyData = join(userDataDir, 'mimocode-hooks', 'shared', 'data')
+    mkdirSync(legacyData, { recursive: true })
+    writeFileSync(join(legacyData, 'auth.json'), '{"legacy":true}')
+    const xdgData = join(userDataDir, 'xdg-data')
+    const service = new MimoCodeHookService()
+
+    service.carryOverLegacyAuth({ XDG_DATA_HOME: xdgData })
+    const auth = join(xdgData, 'mimocode', 'auth.json')
+    expect(readFileSync(auth, 'utf8')).toBe('{"legacy":true}')
+    if (process.platform !== 'win32') {
+      expect(statSync(auth).mode & 0o777).toBe(0o600)
+    }
+
+    expect(existsSync(join(legacyData, 'auth.json'))).toBe(false)
+    expect(existsSync(join(legacyData, 'auth.json.migrated'))).toBe(true)
+
+    rmSync(auth)
+    service.carryOverLegacyAuth({ XDG_DATA_HOME: xdgData })
+    expect(existsSync(auth)).toBe(false)
+  })
+
+  it('never overwrites an existing login or follows a relative MIMOCODE_HOME', () => {
+    const legacyData = join(userDataDir, 'mimocode-hooks', 'shared', 'data')
+    mkdirSync(legacyData, { recursive: true })
+    writeFileSync(join(legacyData, 'auth.json'), '{"legacy":true}')
+    const xdgData = join(userDataDir, 'xdg-data')
+    mkdirSync(join(xdgData, 'mimocode'), { recursive: true })
+    const auth = join(xdgData, 'mimocode', 'auth.json')
+    writeFileSync(auth, '{"canonical":true}')
+    const service = new MimoCodeHookService()
+
+    service.carryOverLegacyAuth({ MIMOCODE_HOME: 'relative-mimo-home' })
+    expect(existsSync(join(process.cwd(), 'relative-mimo-home'))).toBe(false)
+    expect(existsSync(join(legacyData, 'auth.json'))).toBe(true)
+
+    service.carryOverLegacyAuth({ XDG_DATA_HOME: xdgData })
+    expect(readFileSync(auth, 'utf8')).toBe('{"canonical":true}')
+    expect(existsSync(join(legacyData, 'auth.json.migrated'))).toBe(true)
+
+    rmSync(auth)
+    service.carryOverLegacyAuth({ XDG_DATA_HOME: xdgData })
+    expect(existsSync(auth)).toBe(false)
   })
 })
diff --git a/src/main/mimo/hook-service.ts b/src/main/mimo/hook-service.ts
index 52fcc4e836f..5db7e31015f 100644
--- a/src/main/mimo/hook-service.ts
+++ b/src/main/mimo/hook-service.ts
@@ -1,81 +1,150 @@
 import { getAppEnvironment } from '../../shared/app-environment'
-import { join } from 'node:path'
-import { existsSync, mkdirSync, readdirSync, writeFileSync } from 'node:fs'
+import { isAbsolute, join } from 'node:path'
 import { homedir } from 'node:os'
+import {
+  chmodSync,
+  constants,
+  copyFileSync,
+  existsSync,
+  lstatSync,
+  mkdirSync,
+  readdirSync,
+  renameSync,
+  statSync,
+  writeFileSync
+} from 'node:fs'
 import { getOpenCodeFamilyPluginSource } from '../opencode/hook-service'
-import { mirrorEntry, safeRemoveTree } from '../pty/overlay-mirror'
+import { sourceOverlayDirName } from '../opencode/overlay-dir-names'
+import {
+  clearOpenCodeOverlayManifestEntries,
+  readOpenCodeOverlayManifest,
+  writeOpenCodeOverlayManifest,
+  type OpenCodeOverlayManifest
+} from '../opencode/opencode-overlay-manifest'
+import { isSafeDescendCandidate, mirrorEntry, safeRemoveOverlay } from '../pty/overlay-mirror'
 
 const ORCA_MIMOCODE_PLUGIN_FILE = 'orca-mimocode-status.js'
 const MIMOCODE_HOOKS_DIR = 'mimocode-hooks'
-const MIMOCODE_SHARED_HOME = 'shared'
+const PLUGIN_ONLY_CONFIG_DIR = 'config'
+const SOURCE_CONFIG_OVERLAYS_DIR = 'config-overlays'
+const LEGACY_SHARED_HOME = 'shared'
 
-function defaultMimocodeConfigDir(): string {
-  return join(homedir(), '.config', 'mimocode')
-}
-
-function resolveSourceConfigDir(existingHome: string | undefined): string | undefined {
-  if (existingHome) {
-    const fromHome = join(existingHome, 'config')
-    if (existsSync(fromHome)) {
-      return fromHome
-    }
+function isDirectoryFollowingLinks(path: string): boolean {
+  try {
+    return statSync(path).isDirectory()
+  } catch {
+    return false
   }
-  const xdg = defaultMimocodeConfigDir()
-  return existsSync(xdg) ? xdg : undefined
 }
 
+function mirrorInto(sourcePath: string, targetDir: string, name: string): void {
+  // MiMo may have created a same-named file in the overlay since the last launch.
+  safeRemoveOverlay(join(targetDir, name), targetDir)
+  mirrorEntry(sourcePath, join(targetDir, name))
+}
+
+// Keep MiMo-written overlay files (installed plugin deps); replace only what was mirrored last time.
 function mirrorConfigDir(sourceConfigDir: string, targetConfigDir: string): void {
-  mkdirSync(targetConfigDir, { recursive: true })
+  clearOpenCodeOverlayManifestEntries(
+    targetConfigDir,
+    readOpenCodeOverlayManifest(targetConfigDir),
+    ORCA_MIMOCODE_PLUGIN_FILE
+  )
+  const manifest: OpenCodeOverlayManifest = {
+    topLevelEntries: [],
+    pluginEntries: [],
+    sourceConfigDir
+  }
   for (const entry of readdirSync(sourceConfigDir, { withFileTypes: true })) {
-    if (entry.name === 'plugins' && entry.isDirectory()) {
+    const sourcePath = join(sourceConfigDir, entry.name)
+    // A linked plugins dir must not be linked through, or Orca's plugin lands in the user's folder.
+    if (entry.name === 'plugins' && isDirectoryFollowingLinks(sourcePath)) {
       const overlayPlugins = join(targetConfigDir, 'plugins')
-      mkdirSync(overlayPlugins, { recursive: true })
-      for (const pluginEntry of readdirSync(join(sourceConfigDir, 'plugins'), {
-        withFileTypes: true
-      })) {
-        if (pluginEntry.name === ORCA_MIMOCODE_PLUGIN_FILE) {
-          continue
+      if (!ensureRealDirectory(overlayPlugins)) {
+        throw new Error('MiMo overlay plugins folder is not a real directory')
+      }
+      for (const pluginName of readdirSync(sourcePath)) {
+        if (pluginName !== ORCA_MIMOCODE_PLUGIN_FILE) {
+          mirrorInto(join(sourcePath, pluginName), overlayPlugins, pluginName)
+          manifest.pluginEntries.push(pluginName)
         }
-        mirrorEntry(
-          join(sourceConfigDir, 'plugins', pluginEntry.name),
-          join(overlayPlugins, pluginEntry.name)
-        )
       }
       continue
     }
-    mirrorEntry(join(sourceConfigDir, entry.name), join(targetConfigDir, entry.name))
+    mirrorInto(sourcePath, targetConfigDir, entry.name)
+    manifest.topLevelEntries.push(entry.name)
   }
+  writeOpenCodeOverlayManifest(targetConfigDir, manifest)
+}
+
+function ensureRealDirectory(path: string): boolean {
+  mkdirSync(path, { recursive: true })
+  return isSafeDescendCandidate(lstatSync(path))
 }
 
 export class MimoCodeHookService {
   clearPty(_ptyId: string): void {}
 
-  buildPtyEnv(_ptyId: string, existingMimocodeHome?: string): Record<string, string> {
-    const home = join(
-      getAppEnvironment().getPath('userData'),
-      MIMOCODE_HOOKS_DIR,
-      MIMOCODE_SHARED_HOME
-    )
+  /** MIMOCODE_CONFIG_DIR adds a config layer; MIMOCODE_HOME would also move auth and session data. */
+  buildPtyEnv(_ptyId: string, existingConfigDir?: string): { MIMOCODE_CONFIG_DIR?: string } {
+    const fallback = { MIMOCODE_CONFIG_DIR: existingConfigDir }
+    const root = join(getAppEnvironment().getPath('userData'), MIMOCODE_HOOKS_DIR)
+    const overlay = existingConfigDir
+      ? join(root, SOURCE_CONFIG_OVERLAYS_DIR, sourceOverlayDirName(existingConfigDir))
+      : join(root, PLUGIN_ONLY_CONFIG_DIR)
     try {
-      for (const sub of ['config', 'data', 'cache', 'state'] as const) {
-        mkdirSync(join(home, sub), { recursive: true })
+      if (!ensureRealDirectory(root) || !ensureRealDirectory(overlay)) {
+        return fallback
       }
-      const overlayConfig = join(home, 'config')
-      const sourceConfig = resolveSourceConfigDir(existingMimocodeHome)
-      if (sourceConfig) {
-        safeRemoveTree(overlayConfig)
-        mirrorConfigDir(sourceConfig, overlayConfig)
+      if (existingConfigDir && existsSync(existingConfigDir)) {
+        mirrorConfigDir(existingConfigDir, overlay)
+      }
+      const pluginsDir = join(overlay, 'plugins')
+      if (!ensureRealDirectory(pluginsDir)) {
+        return fallback
       }
-      const pluginsDir = join(home, 'config', 'plugins')
-      mkdirSync(pluginsDir, { recursive: true })
       writeFileSync(
         join(pluginsDir, ORCA_MIMOCODE_PLUGIN_FILE),
         getOpenCodeFamilyPluginSource('/hook/mimo-code', { emitSessionStart: false })
       )
     } catch {
-      return existingMimocodeHome ? { MIMOCODE_HOME: existingMimocodeHome } : {}
+      return fallback
+    }
+    return { MIMOCODE_CONFIG_DIR: overlay }
+  }
+
+  /** Older builds kept MiMo data under Orca's MIMOCODE_HOME; move a login made there over once, then mark it migrated. */
+  carryOverLegacyAuth(env: Record<string, string | undefined>): void {
+    const legacyAuth = join(
+      getAppEnvironment().getPath('userData'),
+      MIMOCODE_HOOKS_DIR,
+      LEGACY_SHARED_HOME,
+      'data',
+      'auth.json'
+    )
+    // MiMo rejects a relative MIMOCODE_HOME; Orca would otherwise write relative to its own cwd.
+    if (env.MIMOCODE_HOME && !isAbsolute(env.MIMOCODE_HOME)) {
+      return
+    }
+    // Mirrors MiMo's Global.Path.data resolution (xdg-basedir, or MIMOCODE_HOME/data).
+    const dataDir = env.MIMOCODE_HOME
+      ? join(env.MIMOCODE_HOME, 'data')
+      : join(env.XDG_DATA_HOME || join(homedir(), '.local', 'share'), 'mimocode')
+    const auth = join(dataDir, 'auth.json')
+    try {
+      if (!existsSync(legacyAuth)) {
+        return
+      }
+      if (!existsSync(auth)) {
+        mkdirSync(dataDir, { recursive: true })
+        copyFileSync(legacyAuth, auth, constants.COPYFILE_EXCL)
+        chmodSync(auth, 0o600)
+      }
+      // Never restore the Orca-only login later, e.g. after the user deletes the canonical one.
+      renameSync(legacyAuth, `${legacyAuth}.migrated`)
+    } catch {
+      // A failed carry-over leaves MiMo logged out, as before; never block the launch.
     }
-    return { MIMOCODE_HOME: home }
   }
 }
 
diff --git a/src/main/powershell-osc133-bootstrap.test.ts b/src/main/powershell-osc133-bootstrap.test.ts
index 1cea5b57ccf..87f82d20917 100644
--- a/src/main/powershell-osc133-bootstrap.test.ts
+++ b/src/main/powershell-osc133-bootstrap.test.ts
@@ -27,7 +27,7 @@ describe('PowerShell OSC 133 bootstrap', () => {
 
     expect(script).toContain('[Console]::OutputEncoding = [System.Text.UTF8Encoding]::new()')
     expect(script).toContain('ORCA_OPENCODE_CONFIG_DIR')
-    expect(script).toContain('ORCA_MIMOCODE_HOME')
+    expect(script).toContain('ORCA_MIMOCODE_CONFIG_DIR')
     expect(script).not.toContain('ORCA_PI_CODING_AGENT_DIR')
     expect(script).not.toContain('ORCA_OMP_CODING_AGENT_DIR')
     expect(script).toContain('ORCA_OMP_STATUS_EXTENSION')
diff --git a/src/main/powershell-osc133-bootstrap.ts b/src/main/powershell-osc133-bootstrap.ts
index d90d448fff0..3acd91916af 100644
--- a/src/main/powershell-osc133-bootstrap.ts
+++ b/src/main/powershell-osc133-bootstrap.ts
@@ -10,7 +10,7 @@ const POWERSHELL_OSC133_BOOTSTRAP = `# Orca OSC 133 shell integration for PowerS
 # Restore managed ownership before the shell-integration compatibility guard.
 if ($env:ORCA_OPENCODE_CONFIG_DIR) { $env:OPENCODE_CONFIG_DIR = $env:ORCA_OPENCODE_CONFIG_DIR }
 ${MANAGED_DATA_ACCOUNT_POWERSHELL_RESTORE}
-if ($env:ORCA_MIMOCODE_HOME) { $env:MIMOCODE_HOME = $env:ORCA_MIMOCODE_HOME }
+if ($env:ORCA_MIMOCODE_CONFIG_DIR) { $env:MIMOCODE_CONFIG_DIR = $env:ORCA_MIMOCODE_CONFIG_DIR }
 if ($env:ORCA_CODEX_HOME) { $env:CODEX_HOME = $env:ORCA_CODEX_HOME }
 
 if ($ExecutionContext.SessionState.LanguageMode -eq "FullLanguage" -and
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 816b0292b23..999c37fa2e6 100644
--- a/src/main/providers/local-pty-provider-spawn-env.test.ts
+++ b/src/main/providers/local-pty-provider-spawn-env.test.ts
@@ -522,8 +522,8 @@ describe('LocalPtyProvider', () => {
     it('uses shell wrapper when MiMo home must survive shell startup', async () => {
       provider.configure({
         buildSpawnEnv: (_id, env) => {
-          env.MIMOCODE_HOME = '/tmp/orca-mimocode-overlay'
-          env.ORCA_MIMOCODE_HOME = '/tmp/orca-mimocode-overlay'
+          env.MIMOCODE_CONFIG_DIR = '/tmp/orca-mimocode-overlay'
+          env.ORCA_MIMOCODE_CONFIG_DIR = '/tmp/orca-mimocode-overlay'
           return env
         }
       })
diff --git a/src/main/providers/local-pty-shell-ready-bash-rcfile.ts b/src/main/providers/local-pty-shell-ready-bash-rcfile.ts
index 54c0803af7d..e9c1e101f62 100644
--- a/src/main/providers/local-pty-shell-ready-bash-rcfile.ts
+++ b/src/main/providers/local-pty-shell-ready-bash-rcfile.ts
@@ -43,7 +43,7 @@ ${WSL_MANAGED_CLI_PATH_RESTORE}
 # Restore Orca-managed config after user startup files may override it.
 [[ -n "\${ORCA_OPENCODE_CONFIG_DIR:-}" ]] && export OPENCODE_CONFIG_DIR="\${ORCA_OPENCODE_CONFIG_DIR}"
 ${MANAGED_DATA_ACCOUNT_POSIX_RESTORE}
-[[ -n "\${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="\${ORCA_MIMOCODE_HOME}"
+[[ -n "\${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="\${ORCA_MIMOCODE_CONFIG_DIR}"
 ${getPosixOmpShellWrapper()}
 # Profile scripts must not replace Orca's runtime CODEX_HOME.
 [[ -n "\${ORCA_CODEX_HOME:-}" ]] && export CODEX_HOME="\${ORCA_CODEX_HOME}"
diff --git a/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts b/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts
index ca7c7da5b6a..ab25abe0815 100644
--- a/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts
+++ b/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts
@@ -299,7 +299,7 @@ describePosix('local PTY shell-ready launch config', () => {
     const restoreLine =
       '[[ -n "${ORCA_OPENCODE_CONFIG_DIR:-}" ]] && export OPENCODE_CONFIG_DIR="${ORCA_OPENCODE_CONFIG_DIR}"'
     const mimoRestoreLine =
-      '[[ -n "${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="${ORCA_MIMOCODE_HOME}"'
+      '[[ -n "${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="${ORCA_MIMOCODE_CONFIG_DIR}"'
     const codexRestoreLine =
       '[[ -n "${ORCA_CODEX_HOME:-}" ]] && export CODEX_HOME="${ORCA_CODEX_HOME}"'
     const agentTeamsPathRestoreLine = '[[ -n "${ORCA_AGENT_TEAMS_SHIM_DIR:-}" ]] || return 0'
diff --git a/src/main/providers/windows-shell-args.test.ts b/src/main/providers/windows-shell-args.test.ts
index ec94959601e..d69abee50e6 100644
--- a/src/main/providers/windows-shell-args.test.ts
+++ b/src/main/providers/windows-shell-args.test.ts
@@ -125,7 +125,9 @@ describe('resolveWindowsShellLaunchArgs', () => {
     const opencodeRestoreIndex = command.indexOf(
       '$env:OPENCODE_CONFIG_DIR = $env:ORCA_OPENCODE_CONFIG_DIR'
     )
-    const mimocodeRestoreIndex = command.indexOf('$env:MIMOCODE_HOME = $env:ORCA_MIMOCODE_HOME')
+    const mimocodeRestoreIndex = command.indexOf(
+      '$env:MIMOCODE_CONFIG_DIR = $env:ORCA_MIMOCODE_CONFIG_DIR'
+    )
     const duplicateStateGuardIndex = command.indexOf('Test-Path variable:global:__OrcaOsc133State')
     const languageModeGuardIndex = command.indexOf('LanguageMode -eq "FullLanguage"')
     const ompWrapperIndex = command.indexOf('function Global:omp')
diff --git a/src/main/shell-startup-features.ts b/src/main/shell-startup-features.ts
index 90654c8e12a..64040f1d662 100644
--- a/src/main/shell-startup-features.ts
+++ b/src/main/shell-startup-features.ts
@@ -16,7 +16,7 @@ export type ShellStartupFeature = (typeof SHELL_STARTUP_FEATURES)[number]
 const OVERLAY_ENV_KEYS = [
   'ORCA_DATA_ACCOUNT_DATA_HOME',
   'ORCA_OPENCODE_CONFIG_DIR',
-  'ORCA_MIMOCODE_HOME',
+  'ORCA_MIMOCODE_CONFIG_DIR',
   'ORCA_OMP_STATUS_EXTENSION',
   'ORCA_CODEX_HOME',
   'ORCA_AGENT_TEAMS_SHIM_DIR',
diff --git a/src/main/shell-wrapper-generated-file-snapshot.test.ts b/src/main/shell-wrapper-generated-file-snapshot.test.ts
index c82f71c383d..5ef32a08f39 100644
--- a/src/main/shell-wrapper-generated-file-snapshot.test.ts
+++ b/src/main/shell-wrapper-generated-file-snapshot.test.ts
@@ -50,7 +50,7 @@ const CONTRACT_GLOBALS = new Set([
   // Exported only in the claude function's subshell.
   'CLAUDE_CONFIG_DIR',
   'HISTFILE',
-  'MIMOCODE_HOME',
+  'MIMOCODE_CONFIG_DIR',
   'OPENCODE_CONFIG_DIR',
   'OPENCODE_AUTH_CONTENT',
   'OPENCODE_DB',
diff --git a/src/main/zsh-startup-wrapper-builder.ts b/src/main/zsh-startup-wrapper-builder.ts
index a3b59e638ae..3de62806309 100644
--- a/src/main/zsh-startup-wrapper-builder.ts
+++ b/src/main/zsh-startup-wrapper-builder.ts
@@ -49,7 +49,7 @@ const AGENT_TEAMS_PATH_RESTORE_BLOCK = `__orca_restore_agent_teams_path() {
 __orca_restore_agent_teams_path`
 
 const OPENCODE_CONFIG_DIR_RESTORE = `[[ -n "\${ORCA_OPENCODE_CONFIG_DIR:-}" ]] && export OPENCODE_CONFIG_DIR="\${ORCA_OPENCODE_CONFIG_DIR}"`
-const MIMOCODE_HOME_RESTORE = `[[ -n "\${ORCA_MIMOCODE_HOME:-}" ]] && export MIMOCODE_HOME="\${ORCA_MIMOCODE_HOME}"`
+const MIMOCODE_CONFIG_DIR_RESTORE = `[[ -n "\${ORCA_MIMOCODE_CONFIG_DIR:-}" ]] && export MIMOCODE_CONFIG_DIR="\${ORCA_MIMOCODE_CONFIG_DIR}"`
 const REMOTE_CLI_BIN_DIR_RESTORE = `[[ -n "\${ORCA_REMOTE_CLI_BIN_DIR:-}" ]] && case ":$PATH:" in *:"\${ORCA_REMOTE_CLI_BIN_DIR}":*) ;; *) export PATH="\${ORCA_REMOTE_CLI_BIN_DIR}:$PATH" ;; esac`
 const CODEX_HOME_RESTORE = `# Restore the runtime CODEX_HOME after user rc files.
 [[ -n "\${ORCA_CODEX_HOME:-}" ]] && export CODEX_HOME="\${ORCA_CODEX_HOME}"`
@@ -93,7 +93,7 @@ function getOverlayRestoreBlocks(spec: ZshStartupHookSpec): (string | null)[] {
     spec.restores.agentTeamsPath ? AGENT_TEAMS_PATH_RESTORE_BLOCK : null,
     OPENCODE_CONFIG_DIR_RESTORE,
     MANAGED_DATA_ACCOUNT_POSIX_RESTORE,
-    MIMOCODE_HOME_RESTORE,
+    MIMOCODE_CONFIG_DIR_RESTORE,
     spec.restores.remoteCliBinDir ? REMOTE_CLI_BIN_DIR_RESTORE : null,
     getPosixOmpShellWrapper(),
     spec.restores.codexHome ? CODEX_HOME_RESTORE : null