diff --git a/apps/desktop/e2e/fixtures.ts b/apps/desktop/e2e/fixtures.ts
index cff13431e1..2a725c5029 100644
--- a/apps/desktop/e2e/fixtures.ts
+++ b/apps/desktop/e2e/fixtures.ts
@@ -71,6 +71,21 @@ export async function ensureSidebarExpanded(page: Page): Promise<void> {
   ).toBeVisible();
 }
 
+/**
+ * Wait for the default Host's Coordination Session and the WorkHub projection
+ * to agree that the surface is ready. A mounted WorkHub main is not sufficient:
+ * it is also rendered while the Host reconnects and the projection reloads.
+ */
+export async function waitForWorkHubReady(page: Page, workCount: number): Promise<void> {
+  await expect
+    .poll(async () => {
+      const snapshot = await page.evaluate(() => window.maka.runtimeHostProfiles.getSnapshot());
+      return snapshot.entries.find(({ isDefault }) => isDefault)?.readiness;
+    })
+    .toBe('ready');
+  await expect(page.getByText(`${workCount} 项工作`, { exact: true })).toBeVisible();
+}
+
 /**
  * Wait for Runtime's authoritative Skill projection, not merely for the
  * composer DOM to mount. The renderer requests this projection after its first
diff --git a/apps/desktop/e2e/workhub-layout.spec.ts b/apps/desktop/e2e/workhub-layout.spec.ts
index 28523dff4c..1e25de1205 100644
--- a/apps/desktop/e2e/workhub-layout.spec.ts
+++ b/apps/desktop/e2e/workhub-layout.spec.ts
@@ -17,9 +17,9 @@
  * under the License.
  */
 
-import { expect, test, COMPOSER_INPUT } from './fixtures';
+import { COMPOSER_INPUT, expect, test, waitForWorkHubReady } from './fixtures';
 
-test('WorkHub target metadata does not overlap the submitted Session result', async ({
+test('WorkHub target metadata remains within the submitted Session control', async ({
   window: page,
 }) => {
   const composer = page.locator(COMPOSER_INPUT);
@@ -36,31 +36,26 @@ test('WorkHub target metadata does not overlap the submitted Session result', as
   await page.evaluate(async () => {
     await window.maka.settings.updateClient({ workHub: { enabled: true } });
   });
-  await expect(page.getByText('1 项工作', { exact: true })).toBeVisible();
+  await waitForWorkHubReady(page, 1);
 
+  const routedPrompt = `继续${sessionName}，补充重复投递测试点。`;
   const workHubComposer = page.locator(
     '.workhub-surface .maka-composer-editor [contenteditable="true"]',
   );
-  await workHubComposer.fill(`继续${sessionName}，补充重复投递测试点。`);
+  await workHubComposer.fill(routedPrompt);
   await workHubComposer.press('Enter');
-  await expect(page.locator('.workhub-result')).toBeVisible();
+  const submittedTurn = page.locator('.workhub-turn', { hasText: routedPrompt });
+  await expect(submittedTurn.locator('.workhub-submitted-session small')).toBeVisible();
 
-  const geometry = await page.evaluate(() => {
-    const button = document.querySelector<HTMLElement>('.workhub-submitted > button')!;
+  const buttonContainsProject = await submittedTurn.evaluate((turn) => {
+    const button = turn.querySelector<HTMLElement>('.workhub-submitted > button')!;
     const project = button.querySelector<HTMLElement>('.workhub-submitted-session small')!;
-    const result = document.querySelector<HTMLElement>('.workhub-result')!;
     const buttonBox = button.getBoundingClientRect();
     const projectBox = project.getBoundingClientRect();
-    const resultBox = result.getBoundingClientRect();
-    return {
-      buttonContainsProject: buttonBox.bottom >= projectBox.bottom,
-      overlapHeight:
-        Math.min(projectBox.bottom, resultBox.bottom) - Math.max(projectBox.top, resultBox.top),
-    };
+    return buttonBox.bottom >= projectBox.bottom;
   });
 
-  expect(geometry.buttonContainsProject).toBe(true);
-  expect(geometry.overlapHeight).toBeLessThanOrEqual(0);
+  expect(buttonContainsProject).toBe(true);
 });
 
 test('WorkHub explains Coordination startup failure and recovers after a default model is set', async ({
diff --git a/apps/desktop/e2e/workhub-reconstruction.spec.ts b/apps/desktop/e2e/workhub-reconstruction.spec.ts
index 0b29525c03..4586b37964 100644
--- a/apps/desktop/e2e/workhub-reconstruction.spec.ts
+++ b/apps/desktop/e2e/workhub-reconstruction.spec.ts
@@ -17,7 +17,13 @@
  * under the License.
  */
 
-import { COMPOSER_INPUT, ensureSidebarExpanded, expect, test } from './fixtures';
+import {
+  COMPOSER_INPUT,
+  ensureSidebarExpanded,
+  expect,
+  test,
+  waitForWorkHubReady,
+} from './fixtures';
 
 test('WorkHub rebuilds delegated execution feedback after navigating away and back', async ({
   window: page,
@@ -37,10 +43,9 @@ test('WorkHub rebuilds delegated execution feedback after navigating away and ba
   await page.evaluate(async () => {
     await window.maka.settings.updateClient({ workHub: { enabled: true } });
   });
-  await expect(page.getByRole('main', { name: 'WorkHub' })).toBeVisible();
   // The conversation is the Coordination Session transcript. An ordinary
   // Session is a routing target and a status row, never a turn in WorkHub.
-  await expect(page.getByText('1 项工作', { exact: true })).toBeVisible();
+  await waitForWorkHubReady(page, 1);
   await expect(page.locator('.workhub-turn')).toHaveCount(0);
   await expect(page.locator('.workhub-empty h2')).toHaveText('从这里继续所有工作');
 
@@ -50,15 +55,14 @@ test('WorkHub rebuilds delegated execution feedback after navigating away and ba
   );
   await workHubComposer.fill(routedPrompt);
   await workHubComposer.press('Enter');
-  await expect(page.locator('.workhub-submitted').last()).toBeVisible();
-  await page.locator('.workhub-turn', { hasText: routedPrompt })
-    .locator('.workhub-submitted > button')
-    .click();
+  const routedTurn = page.locator('.workhub-turn', { hasText: routedPrompt });
+  await expect(routedTurn.locator('.workhub-submitted')).toBeVisible();
+  await routedTurn.locator('.workhub-submitted > button').click();
   await expect(page.getByRole('main', { name: 'WorkHub' })).toBeHidden();
 
   await ensureSidebarExpanded(page);
   await page.getByRole('button', { name: 'WorkHub', exact: true }).click();
-  await expect(page.getByRole('main', { name: 'WorkHub' })).toBeVisible();
+  await waitForWorkHubReady(page, 1);
   await expect(
     page.locator('.workhub-projected-turn .workhub-user-bubble > p', {
       hasText: routedPrompt,
@@ -67,7 +71,7 @@ test('WorkHub rebuilds delegated execution feedback after navigating away and ba
   await expect(
     page.locator('.workhub-projected-turn', { hasText: routedPrompt })
       .locator('.workhub-submitted-state'),
-  ).toHaveText('进行中');
+  ).toHaveText('已完成');
 });
 
 test('WorkHub defers destructive correction until linked delegation exists', async ({
@@ -88,11 +92,10 @@ test('WorkHub defers destructive correction until linked delegation exists', asy
   await page.evaluate(async () => {
     await window.maka.settings.updateClient({ workHub: { enabled: true } });
   });
-  await expect(page.getByRole('main', { name: 'WorkHub' })).toBeVisible();
   await page.evaluate(async () => {
     await window.maka.sessions.create({ name: '登录稳定性' });
   });
-  await expect(page.getByText('2 项工作', { exact: true })).toBeVisible();
+  await waitForWorkHubReady(page, 2);
 
   const workHubComposer = page.locator(
     '.workhub-surface .maka-composer-editor [contenteditable="true"]',
@@ -105,6 +108,7 @@ test('WorkHub defers destructive correction until linked delegation exists', asy
   await expect(
     continuedTurn.locator('.workhub-submitted-session strong'),
   ).toHaveText(sourceSessionName);
+  await waitForWorkHubReady(page, 2);
 
   await workHubComposer.fill('不是这个，换成登录稳定性，补充刷新令牌失败判定。');
   await expect(
diff --git a/apps/desktop/src/main/__tests__/workhub-coordination-lifecycle.test.ts b/apps/desktop/src/main/__tests__/workhub-coordination-lifecycle.test.ts
index c1aa00b35d..55ac1c1fff 100644
--- a/apps/desktop/src/main/__tests__/workhub-coordination-lifecycle.test.ts
+++ b/apps/desktop/src/main/__tests__/workhub-coordination-lifecycle.test.ts
@@ -19,19 +19,26 @@
 
 import assert from 'node:assert/strict';
 import test from 'node:test';
+import { desktopSessionKey } from '../../shared/runtime-host-identity.js';
 import {
   startWorkHubCoordinationLifecycle,
   type WorkHubCoordinationHostChange,
 } from '../../renderer/workhub-coordination-lifecycle.js';
 
-test('WorkHub resolves on open and ready Host changes, then stops on feature disable', () => {
+const coordinationSessionId = (hostId: string) => desktopSessionKey({
+  hostId,
+  sessionId: 'maka_workhub_coordination',
+});
+
+test('WorkHub resolves on open and when the default Host authority changes', async () => {
   let hostChange: ((event: WorkHubCoordinationHostChange) => void) | undefined;
   let availabilityChange: (() => void) | undefined;
   const calls: string[] = [];
+  let activeHostId = 'host-a';
   const stop = startWorkHubCoordinationLifecycle({
     resolve: () => {
       calls.push('resolve');
-      return Promise.resolve('coordination-session');
+      return Promise.resolve(coordinationSessionId(activeHostId));
     },
     subscribeHostChanges(handler) {
       hostChange = handler;
@@ -47,27 +54,27 @@ test('WorkHub resolves on open and ready Host changes, then stops on feature dis
   });
 
   assert.deepEqual(calls, ['resolving', 'resolve']);
+  await Promise.resolve();
   hostChange?.({ isDefault: false, readiness: 'ready' });
-  hostChange?.({ isDefault: true, readiness: 'reconnecting' });
-  assert.deepEqual(calls, ['resolving', 'resolve', 'resolving']);
+  hostChange?.({ isDefault: true, readiness: 'reconnecting', hostId: 'host-a' });
+  assert.deepEqual(calls, [
+    'resolving',
+    'resolve',
+    `resolved:${coordinationSessionId('host-a')}`,
+  ]);
 
   availabilityChange?.();
-  assert.deepEqual(calls, ['resolving', 'resolve', 'resolving']);
+  assert.equal(calls.at(-1), `resolved:${coordinationSessionId('host-a')}`);
 
-  hostChange?.({ isDefault: true, readiness: 'ready' });
-  assert.deepEqual(calls, ['resolving', 'resolve', 'resolving', 'resolving', 'resolve']);
+  activeHostId = 'host-b';
+  hostChange?.({ isDefault: true, readiness: 'ready', hostId: 'host-b' });
+  assert.deepEqual(calls.slice(-2), ['resolving', 'resolve']);
+  await Promise.resolve();
+  assert.equal(calls.at(-1), `resolved:${coordinationSessionId('host-b')}`);
 
   stop();
-  assert.deepEqual(calls, [
-    'resolving',
-    'resolve',
-    'resolving',
-    'resolving',
-    'resolve',
-    'unsubscribe-hosts',
-    'unsubscribe-availability',
-  ]);
-  hostChange?.({ isDefault: true, readiness: 'ready' });
+  assert.deepEqual(calls.slice(-2), ['unsubscribe-hosts', 'unsubscribe-availability']);
+  hostChange?.({ isDefault: true, readiness: 'ready', hostId: 'host-c' });
   availabilityChange?.();
   assert.equal(calls.at(-1), 'unsubscribe-availability');
 });
@@ -134,7 +141,7 @@ test('WorkHub exposes a retry and automatically retries when model availability
       resolveAttempts += 1;
       return resolveAttempts < 3
         ? Promise.reject(failure)
-        : Promise.resolve('coordination-session');
+        : Promise.resolve(coordinationSessionId('host-a'));
     },
     subscribeHostChanges(handler) {
       hostChange = handler;
@@ -164,7 +171,7 @@ test('WorkHub exposes a retry and automatically retries when model availability
   availabilityChange?.();
   await Promise.resolve();
   await Promise.resolve();
-  assert.deepEqual(failures, [failure, failure, 'coordination-session']);
+  assert.deepEqual(failures, [failure, failure, coordinationSessionId('host-a')]);
 
   availabilityChange?.();
   hostChange?.({ isDefault: false, readiness: 'ready' });
@@ -189,12 +196,12 @@ test('WorkHub ignores a stale Host resolution that settles after a newer Host',
   });
 
   hostChange?.({ isDefault: true, readiness: 'ready' });
-  pending[1]?.('host-b-coordination');
+  pending[1]?.(coordinationSessionId('host-b'));
   await Promise.resolve();
-  pending[0]?.('host-a-coordination');
+  pending[0]?.(coordinationSessionId('host-a'));
   await Promise.resolve();
 
-  assert.deepEqual(resolved, ['host-b-coordination']);
+  assert.deepEqual(resolved, [coordinationSessionId('host-b')]);
   stop();
 });
 
diff --git a/apps/desktop/src/renderer/workhub-coordination-lifecycle.ts b/apps/desktop/src/renderer/workhub-coordination-lifecycle.ts
index e5607ff872..e042990049 100644
--- a/apps/desktop/src/renderer/workhub-coordination-lifecycle.ts
+++ b/apps/desktop/src/renderer/workhub-coordination-lifecycle.ts
@@ -18,10 +18,11 @@
  */
 
 import type { DesktopRuntimeHostProfileChangedEvent } from '../preload/bridge-contract.js';
+import { parseDesktopSessionKey } from '../shared/runtime-host-identity.js';
 
 export type WorkHubCoordinationHostChange = Pick<
   DesktopRuntimeHostProfileChangedEvent,
-  'isDefault' | 'readiness' | 'removed'
+  'hostId' | 'isDefault' | 'readiness' | 'removed'
 >;
 
 const UNAVAILABLE_DEFAULT_HOST = 'The default Runtime Host is unavailable';
@@ -40,10 +41,12 @@ export function startWorkHubCoordinationLifecycle(input: {
   let stopped = false;
   let generation = 0;
   let failedGeneration: number | undefined;
+  let resolvedHostId: string | undefined;
 
   const revoke = () => {
     const currentGeneration = ++generation;
     failedGeneration = undefined;
+    resolvedHostId = undefined;
     input.onResolving();
     return currentGeneration;
   };
@@ -57,6 +60,7 @@ export function startWorkHubCoordinationLifecycle(input: {
     void input.resolve()
       .then((sessionId) => {
         if (stopped || currentGeneration !== generation) return;
+        resolvedHostId = parseDesktopSessionKey(sessionId).hostId;
         failedGeneration = undefined;
         input.onResolved(sessionId);
       })
@@ -69,6 +73,14 @@ export function startWorkHubCoordinationLifecycle(input: {
 
   const unsubscribeHosts = input.subscribeHostChanges((event) => {
     if (stopped || !event.isDefault) return;
+    if (
+      resolvedHostId !== undefined &&
+      event.hostId === resolvedHostId &&
+      event.readiness !== 'unavailable' &&
+      !event.removed
+    ) {
+      return;
+    }
     const currentGeneration = revoke();
     if (event.readiness === 'ready') {
       resolveGeneration(currentGeneration);