diff --git a/apps/web/tests/preview-boot.e2e.ts b/apps/web/tests/preview-boot.e2e.ts
index 0d054a293d..c89df410bc 100644
--- a/apps/web/tests/preview-boot.e2e.ts
+++ b/apps/web/tests/preview-boot.e2e.ts
@@ -316,7 +316,6 @@ async function bootPreview(origin: string, browser: Browser): Promise<void> {
     const exercised = await page.evaluate(async () => {
       type Result<T> = { result: { ok: true; value: T } | { ok: false; error: { code: string; message: string } } }
       interface PreviewApi {
-        host: { createDirectory(payload: { path: string; name: string }): Promise<Result<{ path: string }>> }
         skills: { list(payload: { sessionId: string }): Promise<Result<{ skills: unknown[] }>> }
         settings: {
           describe(payload: object): Promise<Result<{ namespaces: Array<{ ns: string; revision: number }> }>>
@@ -349,12 +348,26 @@ async function bootPreview(origin: string, browser: Browser): Promise<void> {
       const sessionId = sessions.result.value.items[0]?.sessionId
       if (sessionId === undefined) throw new Error('workspace adoption created no Session')
 
+      // Remote namespaces answer over the same unary carrier; the args object
+      // keys every wire parameter by its name.
+      const remote = async <T>(endpoint: string, args: object): Promise<T> => {
+        const answered = await transport.fetch(`/api/${endpoint}`, {
+          method: 'POST',
+          headers: { 'content-type': 'application/json' },
+          body: JSON.stringify({
+            type: 'client-request', rpcId: `preview-${endpoint.replace('/', '-')}`,
+            method: endpoint, payload: { args },
+          }),
+        })
+        const body = await answered.json() as Result<T>
+        if (!body.result.ok) throw new Error(`${endpoint} failed: ${body.result.error.message}`)
+        return body.result.value
+      }
       const api = transport.createApiClient()
       const skills = await api.skills.list({ sessionId })
       if (!skills.result.ok) throw new Error(`skill.list failed: ${skills.result.error.message}`)
       const createDirectory = async (path: string, name: string): Promise<void> => {
-        const created = await api.host.createDirectory({ path, name })
-        if (!created.result.ok) throw new Error(`host.createDirectory failed: ${created.result.error.message}`)
+        await remote<string>('directoryPicker/createDirectory', { path, name })
         await new Promise((resolve) => { setTimeout(resolve, 250) })
         const refreshed = await api.skills.list({ sessionId })
         if (!refreshed.result.ok) throw new Error(`skill.list refresh failed: ${refreshed.result.error.message}`)
diff --git a/packages/api/remotes/src/client/index.ts b/packages/api/remotes/src/client/index.ts
index 14be075879..473abfbe88 100644
--- a/packages/api/remotes/src/client/index.ts
+++ b/packages/api/remotes/src/client/index.ts
@@ -53,7 +53,7 @@ export type {} from '@deepseek-ai/dsh-api-session-controller/types'
  */
 export type {
   ConfigurableProviderView, ConnectionHandle, ConnectionSinks, ContentBlock,
-  CredentialView, DirectoryListing, DiscoveredModelView, IApiClient,
+  CredentialView, DiscoveredModelView, IApiClient,
   MessageId, ModelCatalog, ModelCatalogFailure, ModelProviderGroup, ModelReasoningEffort, ModelSelection,
   RpcError, RpcId, RpcRequest, RpcResponse, RpcResult, SessionId,
   SettingsNamespaceView, SettingsPathOpView, SkillEntry, StreamChunk,
diff --git a/packages/client/connection/package.json b/packages/client/connection/package.json
index 5c7e53bb70..395e443ea3 100644
--- a/packages/client/connection/package.json
+++ b/packages/client/connection/package.json
@@ -53,6 +53,7 @@
     "@deepseek-ai/dsh-attachment": "workspace:^",
     "@deepseek-ai/dsh-credentials": "workspace:^",
     "@deepseek-ai/dsh-host-apiproxy": "workspace:^",
+    "@deepseek-ai/dsh-host-directory-picker": "workspace:^",
     "@deepseek-ai/dsh-commands": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
@@ -65,6 +66,7 @@
     "@deepseek-ai/dsh-attachment": "workspace:^",
     "@deepseek-ai/dsh-credentials": "workspace:^",
     "@deepseek-ai/dsh-host-apiproxy": "workspace:^",
+    "@deepseek-ai/dsh-host-directory-picker": "workspace:^",
     "@deepseek-ai/dsh-commands": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
diff --git a/packages/client/connection/src/client/fixture.ts b/packages/client/connection/src/client/fixture.ts
index f3a20282ed..0e0eab03e5 100644
--- a/packages/client/connection/src/client/fixture.ts
+++ b/packages/client/connection/src/client/fixture.ts
@@ -29,6 +29,7 @@ import type { TodoItem } from '@deepseek-ai/dsh-tool-todo/client'
 // wire-fabrication boundary (the schema layer's one-cast-point posture).
 import type { CommandId } from '@deepseek-ai/dsh-commands/brand'
 import type { CommandDescriptor, CommandExecution, CommandResult } from '@deepseek-ai/dsh-commands/types'
+import type { DirectoryListing as FixtureDirectoryListing } from '@deepseek-ai/dsh-host-directory-picker/types'
 import { deriveEventMessage, foldSurface } from '@deepseek-ai/dsh-session/surface'
 import type {
   ApiProxy, ClientRequest,
@@ -2178,6 +2179,55 @@ function createFixtureWorld(options: FixtureOptions): FixtureWorld {
     },
   }
 
+  /**
+   * Canonical fixture implementation of the generated Directory Picker Remote
+   * contract. The pick is deterministic — the keyless lanes drive the full
+   * pick-then-adopt path without an OS chooser — over the same design-mock
+   * tree the browse primitives serve.
+   */
+  const directoryPickerRemotes = {
+    pick(): ConnectionRpcResult<string | null> {
+      return { ok: true, value: `${FIXTURE_HOME}/Documents/project` }
+    },
+    list(path?: string): ConnectionRpcResult<FixtureDirectoryListing> {
+      const target = path ?? FIXTURE_HOME
+      const children = childrenOf(target)
+      if (children === undefined) {
+        return {
+          ok: false,
+          error: { code: 'directory-unreadable', message: `cannot list ${target}: not in the fixture tree`, details: { path: target } },
+        }
+      }
+      return {
+        ok: true,
+        value: {
+          path: target,
+          home: FIXTURE_HOME,
+          crumbs: crumbsOf(target),
+          entries: [...children].sort((a, b) => a.localeCompare(b))
+            .map(name => ({ name, path: target === '/' ? `/${name}` : `${target}/${name}`, hidden: name.startsWith('.') })),
+          // The fixture tree is tiny; no level ever reaches a backend bound.
+          truncated: false,
+        },
+      }
+    },
+    createDirectory(parent: string, name: string): ConnectionRpcResult<string> {
+      const children = childrenOf(parent)
+      if (children === undefined) {
+        return { ok: false, error: { code: 'directory-create-failed', message: `missing parent ${parent}`, details: { path: parent } } }
+      }
+      // Same root special case as list's entry paths: a plain join under '/'
+      // would mint '//name' and fork the tree's identity.
+      const target = parent === '/' ? `/${name}` : `${parent}/${name}`
+      if (children.includes(name)) {
+        return { ok: false, error: { code: 'directory-exists', message: `${target} already exists`, details: { path: target } } }
+      }
+      directoryTree.set(parent, [...children, name])
+      directoryTree.set(target, [])
+      return { ok: true, value: target }
+    },
+  }
+
   const goalRemotes = {
     create(id: SessionId, request: { objective: string; maxGoalRounds?: number }): RpcResult<{ ref: FxGoalRef }> {
       const missing = requireGoalSession(id)
@@ -3425,6 +3475,8 @@ function createFixtureWorld(options: FixtureOptions): FixtureWorld {
           agentId: SessionId
           line?: string
           query?: string
+          path?: string
+          name?: string
           images?: readonly unknown[]
           ref?: { id: string; revision: number }
           agentPreset?: string
@@ -3442,6 +3494,10 @@ function createFixtureWorld(options: FixtureOptions): FixtureWorld {
         case 'commands/execute': return Promise.resolve(commandRemotes.execute(sessionId, args.line as string, args.images ?? []))
         case 'fileReferences/list': return Promise.resolve(referenceRemotes.files(sessionId, args.query ?? ''))
         case 'sessionReferenceResolver/candidates': return Promise.resolve(referenceRemotes.sessions(sessionId, args.query ?? ''))
+        case 'directoryPicker/pick': return Promise.resolve(directoryPickerRemotes.pick())
+        case 'directoryPicker/list': return Promise.resolve(directoryPickerRemotes.list(args.path))
+        case 'directoryPicker/createDirectory':
+          return Promise.resolve(directoryPickerRemotes.createDirectory(args.path ?? '', args.name ?? ''))
         case 'goals/create': return Promise.resolve(goalRemotes.create(sessionId, {
           objective: (request as { objective?: string } | undefined)?.objective as string,
           ...(request as { maxGoalRounds?: number } | undefined)?.maxGoalRounds === undefined
diff --git a/packages/client/connection/tests/fixture.client.spec.ts b/packages/client/connection/tests/fixture.client.spec.ts
index f17af5b978..b69d775510 100644
--- a/packages/client/connection/tests/fixture.client.spec.ts
+++ b/packages/client/connection/tests/fixture.client.spec.ts
@@ -17,8 +17,9 @@ import {
   type FixtureOptions,
 } from '../src/client/fixture.ts'
 import type {
-  ClientConnectionRpc,
+  ClientConnectionRpc, ConnectionRpcResult,
 } from '../src/rpc.ts'
+import type { DirectoryListing } from '@deepseek-ai/dsh-host-directory-picker/types'
 
 const sid = (id: string): SessionId => id as SessionId
 type WorkspaceId = string & { readonly __fixtureWorkspaceId: 'WorkspaceId' }
@@ -286,6 +287,12 @@ interface FixtureRemoteEventStream extends AsyncIterable<FixtureRemoteEventFrame
 }
 
 type FixtureTestApi = ReturnType<typeof createFixtureFaces>['api'] & {
+  /** The directory-picking Remote namespace as the fixture serves it. */
+  readonly directoryPickerRemote: {
+    pick: () => Promise<ConnectionRpcResult<string | null>>
+    list: (path?: string) => Promise<ConnectionRpcResult<DirectoryListing>>
+    createDirectory: (path: string, name: string) => Promise<ConnectionRpcResult<string>>
+  }
   readonly sessions: FixtureSessionApi
   readonly sessionRemote: FixtureSessionRemote
   readonly workspace: FixtureWorkspaceApi
@@ -298,6 +305,15 @@ type FixtureTestApi = ReturnType<typeof createFixtureFaces>['api'] & {
 function createFixtureApi(options: FixtureOptions = {}): FixtureTestApi {
   const { api, rpc } = createFixtureFaces(options)
   return Object.assign(api, {
+    directoryPickerRemote: {
+      pick: () => rpc.call('/api', 'directoryPicker/pick', { args: {} }) as
+        Promise<ConnectionRpcResult<string | null>>,
+      list: (path?: string) => rpc.call('/api', 'directoryPicker/list', { args: { path } }) as
+        Promise<ConnectionRpcResult<DirectoryListing>>,
+      createDirectory: (path: string, name: string) =>
+        rpc.call('/api', 'directoryPicker/createDirectory', { args: { path, name } }) as
+          Promise<ConnectionRpcResult<string>>,
+    },
     sessions: createSessionApi(rpc),
     sessionRemote: createSessionRemote(rpc),
     workspace: createWorkspaceApi(rpc),
@@ -1049,18 +1065,18 @@ describe('createFixtureApi', () => {
 
   it('createDirectory under the root mints /name whose listing and crumbs share the identity', async () => {
     const api = createFixtureApi()
-    const created = await api.host.createDirectory(req({ path: '/', name: 'srv' }))
-    if (!created.result.ok) throw new Error('create failed')
-    expect(created.result.value.path).toBe('/srv')
-    const listed = await api.host.listDirectory(req({ path: '/srv' }), new AbortController().signal)
-    if (!listed.result.ok) throw new Error('list failed')
-    expect(listed.result.value.crumbs).toEqual([
+    const created = await api.directoryPickerRemote.createDirectory('/', 'srv')
+    if (!created.ok) throw new Error('create failed')
+    expect(created.value).toBe('/srv')
+    const listed = await api.directoryPickerRemote.list('/srv')
+    if (!listed.ok) throw new Error('list failed')
+    expect(listed.value.crumbs).toEqual([
       { name: '/', path: '/', hidden: false },
       { name: 'srv', path: '/srv', hidden: false },
     ])
-    const root = await api.host.listDirectory(req({ path: '/' }), new AbortController().signal)
-    if (!root.result.ok) throw new Error('root list failed')
-    expect(root.result.value.entries).toContainEqual({ name: 'srv', path: '/srv', hidden: false })
+    const root = await api.directoryPickerRemote.list('/')
+    if (!root.ok) throw new Error('root list failed')
+    expect(root.value.entries).toContainEqual({ name: 'srv', path: '/srv', hidden: false })
   })
 
   it('workspace/follow serves the resident baseline and create reuses on path collision', async () => {
diff --git a/packages/client/connection/tests/http-bridge.host.spec.ts b/packages/client/connection/tests/http-bridge.host.spec.ts
index 1b45ecc014..2e267ac966 100644
--- a/packages/client/connection/tests/http-bridge.host.spec.ts
+++ b/packages/client/connection/tests/http-bridge.host.spec.ts
@@ -35,11 +35,11 @@ describe('HTTP bridge abort', () => {
 
   it('aborts a pending native picker request when the browser disconnects', async () => {
     const body = JSON.stringify({
-      type: 'client-request', rpcId: 'picker-1', method: 'host.pickDirectory', payload: {},
+      type: 'client-request', rpcId: 'picker-1', method: 'directoryPicker/pick', payload: { args: {} },
     })
     const request = Readable.from([Buffer.from(body)]) as unknown as IncomingMessage
     Object.assign(request, {
-      url: '/api/host.pickDirectory',
+      url: '/api/directoryPicker/pick',
       method: 'POST',
       headers: { 'content-type': 'application/json' },
     })
diff --git a/packages/client/connection/tsconfig.client.json b/packages/client/connection/tsconfig.client.json
index c40e2cbadb..cb409edde0 100644
--- a/packages/client/connection/tsconfig.client.json
+++ b/packages/client/connection/tsconfig.client.json
@@ -36,6 +36,9 @@
     {
       "path": "../../host/apiproxy"
     },
+    {
+      "path": "../../host/directory-picker"
+    },
     {
       "path": "../../interaction/commands"
     },
diff --git a/packages/client/ui-directory-picker-browse/package.json b/packages/client/ui-directory-picker-browse/package.json
index 9c134a13ff..2d0003c1e8 100644
--- a/packages/client/ui-directory-picker-browse/package.json
+++ b/packages/client/ui-directory-picker-browse/package.json
@@ -32,7 +32,7 @@
   "dsh": {
     "client": {
       "inject": [
-        "@deepseek-ai/dsh-client-connection",
+        "@deepseek-ai/dsh-api-remotes",
         "@deepseek-ai/dsh-client-ui-renderer",
         "@deepseek-ai/dsh-client-ui-workspace",
         "@deepseek-ai/dsh-client-locale"
@@ -49,7 +49,7 @@
     "clsx": "^2.0.0"
   },
   "peerDependencies": {
-    "@deepseek-ai/dsh-client-connection": "workspace:^",
+    "@deepseek-ai/dsh-api-remotes": "workspace:^",
     "@deepseek-ai/dsh-client-locale": "workspace:^",
     "@deepseek-ai/dsh-client-ui-renderer": "workspace:^",
     "@deepseek-ai/dsh-client-ui-workspace": "workspace:^",
@@ -57,7 +57,7 @@
     "@deepseek-ai/cordis": "workspace:^"
   },
   "devDependencies": {
-    "@deepseek-ai/dsh-client-connection": "workspace:^",
+    "@deepseek-ai/dsh-api-remotes": "workspace:^",
     "@deepseek-ai/dsh-client-locale": "workspace:^",
     "@deepseek-ai/dsh-client-test-runtime": "workspace:^",
     "@deepseek-ai/dsh-client-ui-primitives": "workspace:^",
diff --git a/packages/client/ui-directory-picker-browse/src/client/DirectoryBrowser.tsx b/packages/client/ui-directory-picker-browse/src/client/DirectoryBrowser.tsx
index 571ab4f2a9..d96e513c34 100644
--- a/packages/client/ui-directory-picker-browse/src/client/DirectoryBrowser.tsx
+++ b/packages/client/ui-directory-picker-browse/src/client/DirectoryBrowser.tsx
@@ -40,7 +40,7 @@ import {
   Button, IconCheckOutline16, IconChevronRightOutline14, IconEditOutline16, IconFolderClose16, IconFolderOpen16,
   IconPlusOutline16, Modal,
 } from '@deepseek-ai/dsh-client-ui-primitives'
-import type { DirectoryEntry, DirectoryListing } from '@deepseek-ai/dsh-client-connection/client'
+import type { DirectoryEntry, DirectoryListing } from '@deepseek-ai/dsh-api-remotes/client'
 import type { Translate } from '@deepseek-ai/dsh-client-locale/client'
 import css from './DirectoryBrowser.module.css'
 
diff --git a/packages/client/ui-directory-picker-browse/src/client/flow.ts b/packages/client/ui-directory-picker-browse/src/client/flow.ts
index dbe80e9415..e532eaf762 100644
--- a/packages/client/ui-directory-picker-browse/src/client/flow.ts
+++ b/packages/client/ui-directory-picker-browse/src/client/flow.ts
@@ -5,7 +5,7 @@
  */
 import { createElement } from 'react'
 import type { ReactElement } from 'react'
-import type { DirectoryListing } from '@deepseek-ai/dsh-client-connection/client'
+import type { DirectoryListing } from '@deepseek-ai/dsh-api-remotes/client'
 import type { Translate } from '@deepseek-ai/dsh-client-locale/client'
 // Type-only: the owner contract of the directory-flow holes.
 import type { DirectoryFlowOwnerProps } from '@deepseek-ai/dsh-client-ui-workspace/client'
diff --git a/packages/client/ui-directory-picker-browse/src/client/index.ts b/packages/client/ui-directory-picker-browse/src/client/index.ts
index 8730d48098..9e7b2833ea 100644
--- a/packages/client/ui-directory-picker-browse/src/client/index.ts
+++ b/packages/client/ui-directory-picker-browse/src/client/index.ts
@@ -2,10 +2,11 @@
  * Browser half of the browse directory-picker backend: fills ui-workspace's
  * two directory-flow holes with the in-app Select Workspace Directory dialog
  * (figma `Harness` 813-23126 family), driving the node half's
- * `host.listDirectory`/`host.createDirectory` primitives. Mounting this
- * package therefore composes both sides of the browse interaction with one
- * cordis.yml row; no client code branches on a capability kind. The dialog's
- * copy is locale-registered here — the flow package owns its own strings.
+ * `directoryPicker/list`/`directoryPicker/createDirectory` primitives.
+ * Mounting this package therefore composes both sides of the browse
+ * interaction with one cordis.yml row; no client code branches on a
+ * capability kind. The dialog's copy is locale-registered here — the flow
+ * package owns its own strings.
  */
 import type { Context as ClientContext } from '@deepseek-ai/cordis'
 // Type-only: pulls the SlotMap merge declaring the directory-flow holes.
diff --git a/packages/client/ui-directory-picker-browse/tests/client-flow.client.spec.tsx b/packages/client/ui-directory-picker-browse/tests/client-flow.client.spec.tsx
index 6008e58ddc..f98d959478 100644
--- a/packages/client/ui-directory-picker-browse/tests/client-flow.client.spec.tsx
+++ b/packages/client/ui-directory-picker-browse/tests/client-flow.client.spec.tsx
@@ -2,7 +2,7 @@
 import { Context } from '@deepseek-ai/cordis'
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react'
-import type { DirectoryListing } from '@deepseek-ai/dsh-client-connection/client'
+import type { DirectoryListing } from '@deepseek-ai/dsh-api-remotes/client'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-ui-renderer/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
diff --git a/packages/client/ui-directory-picker-browse/tests/directory-browser.client.spec.tsx b/packages/client/ui-directory-picker-browse/tests/directory-browser.client.spec.tsx
index 69a624eb38..5f386c8723 100644
--- a/packages/client/ui-directory-picker-browse/tests/directory-browser.client.spec.tsx
+++ b/packages/client/ui-directory-picker-browse/tests/directory-browser.client.spec.tsx
@@ -1,7 +1,7 @@
 // @vitest-environment jsdom
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { act, cleanup, fireEvent, render, screen, waitFor, within } from '@testing-library/react'
-import type { DirectoryListing } from '@deepseek-ai/dsh-client-connection/client'
+import type { DirectoryListing } from '@deepseek-ai/dsh-api-remotes/client'
 import { DirectoryBrowser } from '../src/client/DirectoryBrowser.tsx'
 
 afterEach(cleanup)
diff --git a/packages/client/ui-directory-picker-browse/tsconfig.json b/packages/client/ui-directory-picker-browse/tsconfig.json
index 24535dac3f..aaa77a76d9 100644
--- a/packages/client/ui-directory-picker-browse/tsconfig.json
+++ b/packages/client/ui-directory-picker-browse/tsconfig.json
@@ -18,7 +18,7 @@
       "path": "../ui-primitives"
     },
     {
-      "path": "../connection/tsconfig.client.json"
+      "path": "../../api/remotes/tsconfig.client.json"
     },
     {
       "path": "../locale"
diff --git a/packages/client/ui-directory-picker-native/src/client/index.ts b/packages/client/ui-directory-picker-native/src/client/index.ts
index 951efc2356..68589c2982 100644
--- a/packages/client/ui-directory-picker-native/src/client/index.ts
+++ b/packages/client/ui-directory-picker-native/src/client/index.ts
@@ -1,7 +1,7 @@
 /**
  * Browser half of the native directory-picker backend: fills ui-workspace's
  * two directory-flow holes with a renderless occupant that answers each
- * `open` by driving `host.pickDirectory` (the node half's OS chooser) and
+ * `open` by driving `directoryPicker/pick` (the node half's OS chooser) and
  * reporting the one outcome — picked path, cancellation, or failure — back
  * through the owner conversation. Mounting this package therefore composes
  * both sides of the native interaction with one cordis.yml row; no client
diff --git a/packages/client/ui-workspace/package.json b/packages/client/ui-workspace/package.json
index a50f80911e..b009ef95eb 100644
--- a/packages/client/ui-workspace/package.json
+++ b/packages/client/ui-workspace/package.json
@@ -32,6 +32,7 @@
   "dsh": {
     "client": {
       "inject": [
+        "@deepseek-ai/dsh-api-remotes",
         "@deepseek-ai/dsh-api-session-controller",
         "@deepseek-ai/dsh-api-workspace-controller",
         "@deepseek-ai/dsh-client-connection",
@@ -53,6 +54,7 @@
     "clsx": "^2.0.0"
   },
   "peerDependencies": {
+    "@deepseek-ai/dsh-api-remotes": "workspace:^",
     "@deepseek-ai/dsh-api-session-controller": "workspace:^",
     "@deepseek-ai/dsh-api-workspace-controller": "workspace:^",
     "@deepseek-ai/dsh-client-connection": "workspace:^",
@@ -62,11 +64,13 @@
     "@deepseek-ai/dsh-client-ui-session": "workspace:^",
     "@deepseek-ai/dsh-client-ui-sidebar": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-typert-protocol": "workspace:^",
     "@deepseek-ai/cordis": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
     "@deepseek-ai/dsh-util-workspace-path": "workspace:^"
   },
   "devDependencies": {
+    "@deepseek-ai/dsh-api-remotes": "workspace:^",
     "@deepseek-ai/dsh-api-session-controller": "workspace:^",
     "@deepseek-ai/dsh-api-workspace-controller": "workspace:^",
     "@deepseek-ai/dsh-client-connection": "workspace:^",
@@ -80,6 +84,7 @@
     "@deepseek-ai/dsh-client-ui-sidebar": "workspace:^",
     "@deepseek-ai/dsh-client-ui-slots": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-typert-protocol": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
     "@deepseek-ai/dsh-util-workspace-path": "workspace:^",
     "@types/react": "~18.3.1",
diff --git a/packages/client/ui-workspace/src/client/index.ts b/packages/client/ui-workspace/src/client/index.ts
index da06e95cc9..7f87202365 100644
--- a/packages/client/ui-workspace/src/client/index.ts
+++ b/packages/client/ui-workspace/src/client/index.ts
@@ -59,7 +59,9 @@ const NS = 'workspace'
  * provides a waitable service. apply therefore depends on each slot
  * declaration through `slots.inject()` instead of assuming order.
  */
-export const inject = ['slots', 'sessions', 'workspaces', 'locale', 'connection']
+export const inject = [
+  'slots', 'sessions', 'workspaces', 'locale', 'connection', 'remote', 'remote.directoryPicker',
+]
 
 /**
  * Register the browser and picker once their slot declarations are on the
@@ -72,7 +74,8 @@ export function apply(ctx: Context): void {
   const sessions = ctx.get('sessions') as ISessions
   const workspaces = ctx.get('workspaces') as IWorkspaces
   const hostDescription = connection.hostDescription
-  const uiWorkspace = new UiWorkspaceService(ctx, connection.api, workspaces, sessions)
+  const uiWorkspace = new UiWorkspaceService(
+    ctx, connection.api, ctx.remote.directoryPicker, workspaces, sessions)
   ctx.slots.provideRoot({ hooks: { workspaces: workspaces.list } })
   ctx.effect(() => ctx.locale.register(NS, { zh, en }), 'ui-workspace: dictionaries')
 
diff --git a/packages/client/ui-workspace/src/client/navigation.ts b/packages/client/ui-workspace/src/client/navigation.ts
index 1135f60b2e..4d0f3e3fa9 100644
--- a/packages/client/ui-workspace/src/client/navigation.ts
+++ b/packages/client/ui-workspace/src/client/navigation.ts
@@ -1,9 +1,9 @@
 /** Workspace archive and directory UI capability. */
 
 import { Service, type Context } from '@deepseek-ai/cordis'
-import type {
-  DirectoryListing, IApiClient, RpcError,
-} from '@deepseek-ai/dsh-client-connection/client'
+import type { IApiClient } from '@deepseek-ai/dsh-client-connection/client'
+import type { ClientRemote, DirectoryListing } from '@deepseek-ai/dsh-api-remotes/client'
+import type { RemoteFailure } from '@deepseek-ai/dsh-typert-protocol'
 import type {
   ISessions,
   SessionListState,
@@ -69,7 +69,7 @@ export class DirectoryBrowseError extends Error {
   override readonly name = 'DirectoryBrowseError'
 
   /** @param rpcError - Host directory business failure. */
-  constructor(readonly rpcError: RpcError) {
+  constructor(readonly rpcError: RemoteFailure) {
     super(`directory browse failed: ${rpcError.code}: ${rpcError.message}`)
   }
 }
@@ -81,12 +81,14 @@ class UiWorkspaceService extends Service implements UiWorkspace {
   /**
    * @param ctx - Client root Context.
    * @param api - shared Host API carrier.
+   * @param directoryPicker - the directory-picking Remote namespace.
    * @param workspaces - pure Workspace Controller.
    * @param sessions - pure Session Controller.
    */
   constructor(
     ctx: Context,
     private readonly api: IApiClient,
+    private readonly directoryPicker: ClientRemote['directoryPicker'],
     private readonly workspaces: IWorkspaces,
     private readonly sessions: ISessions,
   ) {
@@ -144,23 +146,21 @@ class UiWorkspaceService extends Service implements UiWorkspace {
   }
 
   async pickDirectory(): Promise<string | null> {
-    const response = await this.api.host.pickDirectory({})
-    if (!response.result.ok) {
-      throw new Error(`directory picker failed: ${response.result.error.message}`)
-    }
-    return response.result.value.path
+    const result = await this.directoryPicker.pick()
+    if (!result.ok) throw new Error(`directory picker failed: ${result.error.message}`)
+    return result.value
   }
 
   async listDirectory(path?: string, signal?: AbortSignal): Promise<DirectoryListing> {
-    const response = await this.api.host.listDirectory(path === undefined ? {} : { path }, signal)
-    if (!response.result.ok) throw new DirectoryBrowseError(response.result.error)
-    return response.result.value
+    const result = await this.directoryPicker.list(path, signal)
+    if (!result.ok) throw new DirectoryBrowseError(result.error)
+    return result.value
   }
 
   async createDirectory(path: string, name: string): Promise<string> {
-    const response = await this.api.host.createDirectory({ path, name })
-    if (!response.result.ok) throw new DirectoryBrowseError(response.result.error)
-    return response.result.value.path
+    const result = await this.directoryPicker.createDirectory(path, name)
+    if (!result.ok) throw new DirectoryBrowseError(result.error)
+    return result.value
   }
 
   async openPath(path: string): Promise<void> {
diff --git a/packages/client/ui-workspace/tests/apply.client.spec.ts b/packages/client/ui-workspace/tests/apply.client.spec.ts
index 79aef72717..3834358288 100644
--- a/packages/client/ui-workspace/tests/apply.client.spec.ts
+++ b/packages/client/ui-workspace/tests/apply.client.spec.ts
@@ -1,6 +1,7 @@
 import { Context } from '@deepseek-ai/cordis'
 import { describe, expect, it, vi } from 'vitest'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-ui-renderer/client'
+import { TestRemote } from '@deepseek-ai/dsh-client-test-runtime'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { apply, inject } from '@deepseek-ai/dsh-client-ui-workspace/client'
 import type { WorkspaceBrowserInjected, WorkspacePickerInjected } from '@deepseek-ai/dsh-client-ui-workspace/client'
@@ -60,6 +61,10 @@ async function bench() {
   ctx.provide('connection', {
     hostDescription: { getSnapshot: () => undefined, subscribe: () => () => {} },
   } as never)
+  const pickDirectory = vi.fn(() => Promise.resolve({ ok: true as const, value: '/projects/picked' }))
+  const directoryPicker = { pick: pickDirectory }
+  Object.assign(new TestRemote(ctx), { directoryPicker })
+  ctx.provide('remote.directoryPicker', directoryPicker as never)
   const locale = new LocaleRuntime(ctx)
   // These specs assert the shipped Chinese copy. There is no jsdom `window`
   // in this lane, so browser-language detection never runs and the locale
@@ -68,7 +73,7 @@ async function bench() {
   ctx.provide('locale', locale)
   return {
     ctx, slots: ctx.get('slots') as SlotRegistry, locale, create, rename,
-    insertSessionBefore, open, clear, search, renameSession, binding, fork,
+    insertSessionBefore, open, clear, search, renameSession, binding, fork, pickDirectory,
   }
 }
 
@@ -83,7 +88,7 @@ function declare(slots: SlotRegistry, ...names: HoleName[]): () => void {
 describe('ui-workspace apply', () => {
   it('declares the services it drives', () => {
     expect(inject).toEqual([
-      'slots', 'sessions', 'workspaces', 'locale', 'connection',
+      'slots', 'sessions', 'workspaces', 'locale', 'connection', 'remote', 'remote.directoryPicker',
     ])
   })
 
diff --git a/packages/client/ui-workspace/tests/rename-assembly.client.spec.tsx b/packages/client/ui-workspace/tests/rename-assembly.client.spec.tsx
index 7db2ebd545..cc698e7391 100644
--- a/packages/client/ui-workspace/tests/rename-assembly.client.spec.tsx
+++ b/packages/client/ui-workspace/tests/rename-assembly.client.spec.tsx
@@ -17,7 +17,7 @@ import type { ISession } from '@deepseek-ai/dsh-api-session-controller/client'
 import type { WorkspaceId } from '@deepseek-ai/dsh-api-workspace-controller/client'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import type { PropsRenderSlots } from '@deepseek-ai/dsh-client-ui-slots'
-import { SlotTestRuntime, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
+import { SlotTestRuntime, TestRemote, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { apply, inject } from '@deepseek-ai/dsh-client-ui-workspace/client'
 
@@ -37,6 +37,11 @@ async function createRuntime(): Promise<SlotTestRuntime> {
   runtime.ctx.provide('connection', {
     hostDescription: { getSnapshot: () => undefined, subscribe: () => () => {} },
   })
+  // The rename flow never picks a directory; the namespace only has to be there
+  // for ui-workspace's inject to settle.
+  const directoryPicker = {}
+  Object.assign(new TestRemote(runtime.ctx), { directoryPicker })
+  runtime.ctx.provide('remote.directoryPicker', directoryPicker as never)
   const locale = new LocaleRuntime(runtime.ctx)
   runtime.ctx.provide('locale', locale)
   runtime.slots.installLocale(locale)
diff --git a/packages/client/ui-workspace/tests/workspaces-service.client.spec.ts b/packages/client/ui-workspace/tests/workspaces-service.client.spec.ts
index 875709a409..95d113bbfd 100644
--- a/packages/client/ui-workspace/tests/workspaces-service.client.spec.ts
+++ b/packages/client/ui-workspace/tests/workspaces-service.client.spec.ts
@@ -8,11 +8,12 @@ import type {
 } from '@deepseek-ai/dsh-api-workspace-controller/client'
 import {
   RpcId,
-  type DirectoryListing,
   type IApiClient,
   type RpcError,
   type RpcResponse,
 } from '@deepseek-ai/dsh-client-connection/client'
+import type { ClientRemote, DirectoryListing } from '@deepseek-ai/dsh-api-remotes/client'
+import type { RemoteResult } from '@deepseek-ai/dsh-typert-protocol'
 import { SessionId } from '@deepseek-ai/dsh-session/types'
 import { DirectoryBrowseError, UiWorkspaceService } from '../src/client/navigation.ts'
 
@@ -180,9 +181,6 @@ class FakeApiClient implements IApiClient {
     home: '/home/u',
     canOpenPath: true,
   }))
-  onPickDirectory: IApiClient['host']['pickDirectory'] = () => Promise.resolve(ok({ path: null }))
-  onListDirectory: IApiClient['host']['listDirectory'] = () => Promise.resolve(ok(listing))
-  onCreateDirectory: IApiClient['host']['createDirectory'] = () => Promise.resolve(ok({ path: '/home/u/new' }))
   onOpenPath: IApiClient['host']['openPath'] = () => Promise.resolve(ok({ opened: true }))
 
   declare readonly skills: IApiClient['skills']
@@ -193,9 +191,6 @@ class FakeApiClient implements IApiClient {
 
   readonly host: IApiClient['host'] = {
     describe: (payload, signal) => this.record('host.describe', payload, this.onDescribe(payload, signal)),
-    pickDirectory: (payload, signal) => this.record('host.pickDirectory', payload, this.onPickDirectory(payload, signal)),
-    listDirectory: (payload, signal) => this.record('host.listDirectory', payload, this.onListDirectory(payload, signal)),
-    createDirectory: (payload, signal) => this.record('host.createDirectory', payload, this.onCreateDirectory(payload, signal)),
     openPath: (payload, signal) => this.record('host.openPath', payload, this.onOpenPath(payload, signal)),
   }
 
@@ -209,6 +204,32 @@ class FakeApiClient implements IApiClient {
   }
 }
 
+/** The directory-picking Remote namespace, recorded and scripted per case. */
+class FakeDirectoryPicker {
+  readonly calls: { method: string; payload: unknown }[] = []
+
+  onPick: () => Promise<RemoteResult<string | null>> = () => Promise.resolve({ ok: true, value: null })
+  onList: () => Promise<RemoteResult<DirectoryListing>> = () => Promise.resolve({ ok: true, value: listing })
+  onCreateDirectory: () => Promise<RemoteResult<string>> =
+    () => Promise.resolve({ ok: true, value: '/home/u/new' })
+
+  readonly remote: ClientRemote['directoryPicker'] = {
+    pick: () => this.record('pick', {}, this.onPick()),
+    list: (path?: string) => this.record('list', { path }, this.onList()),
+    createDirectory: (path: string, name: string) =>
+      this.record('createDirectory', { path, name }, this.onCreateDirectory()),
+  }
+
+  callsOf(method: string): unknown[] {
+    return this.calls.filter(call => call.method === method).map(call => call.payload)
+  }
+
+  private record<T>(method: string, payload: unknown, result: Promise<T>): Promise<T> {
+    this.calls.push({ method, payload })
+    return result
+  }
+}
+
 interface BenchOptions {
   readonly workspaces?: WorkspaceSnapshot
   readonly sessions?: SessionListState
@@ -217,15 +238,17 @@ interface BenchOptions {
 function bench(options: BenchOptions = {}) {
   const ctx = new Context()
   const api = new FakeApiClient()
+  const directoryPicker = new FakeDirectoryPicker()
   const workspaces = new FakeWorkspaces(options.workspaces ?? workspaceState([], [], 'pending'))
   const sessions = new FakeSessions(options.sessions ?? sessionState([], undefined, 'pending'))
   const uiWorkspace = new UiWorkspaceService(
     ctx,
     api,
+    directoryPicker.remote,
     workspaces,
     sessions as unknown as ISessions,
   )
-  return { api, ctx, sessions, uiWorkspace, workspaces }
+  return { api, ctx, directoryPicker, sessions, uiWorkspace, workspaces }
 }
 
 async function flush(): Promise<void> {
@@ -451,31 +474,33 @@ describe('UiWorkspaceService', () => {
 
   it('passes directory operations to the Host and preserves structured browse failures', async () => {
     const b = bench()
-    b.api.onPickDirectory = () => Promise.resolve(ok({ path: '/w/alpha' }))
+    b.directoryPicker.onPick = () => Promise.resolve({ ok: true, value: '/w/alpha' })
     await expect(b.uiWorkspace.pickDirectory()).resolves.toBe('/w/alpha')
-    b.api.onPickDirectory = () => Promise.resolve(ok({ path: null }))
+    b.directoryPicker.onPick = () => Promise.resolve({ ok: true, value: null })
     await expect(b.uiWorkspace.pickDirectory()).resolves.toBeNull()
-    expect(b.api.callsOf('host.pickDirectory')).toEqual([{}, {}])
+    expect(b.directoryPicker.callsOf('pick')).toEqual([{}, {}])
 
     await expect(b.uiWorkspace.listDirectory()).resolves.toEqual(listing)
     await expect(b.uiWorkspace.listDirectory('/home/u')).resolves.toEqual(listing)
-    expect(b.api.callsOf('host.listDirectory')).toEqual([{}, { path: '/home/u' }])
+    expect(b.directoryPicker.callsOf('list')).toEqual([{ path: undefined }, { path: '/home/u' }])
     await expect(b.uiWorkspace.createDirectory('/home/u', 'new')).resolves.toBe('/home/u/new')
-    expect(b.api.callsOf('host.createDirectory')).toEqual([{ path: '/home/u', name: 'new' }])
+    expect(b.directoryPicker.callsOf('createDirectory')).toEqual([{ path: '/home/u', name: 'new' }])
     await expect(b.uiWorkspace.openPath('/w/alpha/file.ts')).resolves.toBeUndefined()
     expect(b.api.callsOf('host.openPath')).toEqual([{ path: '/w/alpha/file.ts' }])
 
-    b.api.onPickDirectory = () => Promise.resolve(failed({ code: 'internal', message: 'no chooser', details: {} }))
+    b.directoryPicker.onPick = () => Promise.resolve({
+      ok: false, error: { code: 'internal', message: 'no chooser', details: {} },
+    })
     await expect(b.uiWorkspace.pickDirectory()).rejects.toThrow('directory picker failed: no chooser')
-    b.api.onListDirectory = () => Promise.resolve(failed({
-      code: 'directory-unreadable', message: 'denied', details: { path: '/private' },
-    }))
+    b.directoryPicker.onList = () => Promise.resolve({
+      ok: false, error: { code: 'directory-unreadable', message: 'denied', details: { path: '/private' } },
+    })
     const listFailure = b.uiWorkspace.listDirectory('/private')
     await expect(listFailure).rejects.toBeInstanceOf(DirectoryBrowseError)
     await expect(listFailure).rejects.toMatchObject({ rpcError: { code: 'directory-unreadable' } })
-    b.api.onCreateDirectory = () => Promise.resolve(failed({
-      code: 'directory-exists', message: 'taken', details: { path: '/home/u/new' },
-    }))
+    b.directoryPicker.onCreateDirectory = () => Promise.resolve({
+      ok: false, error: { code: 'directory-exists', message: 'taken', details: { path: '/home/u/new' } },
+    })
     await expect(b.uiWorkspace.createDirectory('/home/u', 'new')).rejects.toMatchObject({
       rpcError: { code: 'directory-exists' },
     })
diff --git a/packages/client/ui-workspace/tsconfig.json b/packages/client/ui-workspace/tsconfig.json
index 5d7708e031..398f9c2128 100644
--- a/packages/client/ui-workspace/tsconfig.json
+++ b/packages/client/ui-workspace/tsconfig.json
@@ -29,6 +29,9 @@
     {
       "path": "../connection/tsconfig.client.json"
     },
+    {
+      "path": "../../api/remotes/tsconfig.client.json"
+    },
     {
       "path": "../store"
     },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 80cb2119f1..11f1d8f5d3 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1615,6 +1615,9 @@ importers:
       '@deepseek-ai/dsh-host-apiproxy':
         specifier: workspace:^
         version: link:../../host/apiproxy
+      '@deepseek-ai/dsh-host-directory-picker':
+        specifier: workspace:^
+        version: link:../../host/directory-picker
       '@deepseek-ai/dsh-host-webserver':
         specifier: workspace:^
         version: link:../../host/webserver
@@ -2252,9 +2255,9 @@ importers:
       '@deepseek-ai/cordis':
         specifier: workspace:^
         version: link:../../../vendor/cordis
-      '@deepseek-ai/dsh-client-connection':
+      '@deepseek-ai/dsh-api-remotes':
         specifier: workspace:^
-        version: link:../connection
+        version: link:../../api/remotes
       '@deepseek-ai/dsh-client-locale':
         specifier: workspace:^
         version: link:../locale
@@ -3624,6 +3627,9 @@ importers:
       '@deepseek-ai/cordis':
         specifier: workspace:^
         version: link:../../../vendor/cordis
+      '@deepseek-ai/dsh-api-remotes':
+        specifier: workspace:^
+        version: link:../../api/remotes
       '@deepseek-ai/dsh-api-session-controller':
         specifier: workspace:^
         version: link:../../api/session-controller
@@ -3666,6 +3672,9 @@ importers:
       '@deepseek-ai/dsh-session':
         specifier: workspace:^
         version: link:../../core/session
+      '@deepseek-ai/dsh-typert-protocol':
+        specifier: workspace:^
+        version: link:../../typert/protocol
       '@deepseek-ai/dsh-util-workspace-path':
         specifier: workspace:^
         version: link:../../util/workspace-path