diff --git a/.github/workflows/pr-quality.yml b/.github/workflows/pr-quality.yml
index 86ef6846..d6789e14 100644
--- a/.github/workflows/pr-quality.yml
+++ b/.github/workflows/pr-quality.yml
@@ -128,6 +128,9 @@ jobs:
           bun-version-file: package.json
       - name: Install root dependencies
         run: bun install --frozen-lockfile
+      - name: Install adapter dependencies
+        working-directory: adapters
+        run: bun install --frozen-lockfile
       - name: Run root runtime checks
         run: bun run check:server
 
diff --git a/desktop/src/pages/TraceSession.test.tsx b/desktop/src/pages/TraceSession.test.tsx
index 684f0078..22f03c33 100644
--- a/desktop/src/pages/TraceSession.test.tsx
+++ b/desktop/src/pages/TraceSession.test.tsx
@@ -1,4 +1,4 @@
-import { cleanup, fireEvent, render, screen, waitFor, within } from '@testing-library/react'
+import { act, cleanup, fireEvent, render, screen, waitFor, within } from '@testing-library/react'
 import '@testing-library/jest-dom'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { TraceSession } from './TraceSession'
@@ -503,16 +503,35 @@ describe('TraceSession', () => {
         },
         calls: [baseTrace.calls[0]!, makeCall({ id: 'call-2', startedAt: '2026-06-09T10:00:08.000Z' })],
       })
-    await renderReady(20)
+    // Advance polls only after each state is asserted. A real 20ms interval can
+    // invalidate the detail cache before the initial assertion under coverage.
+    vi.useFakeTimers({ toFake: ['setInterval', 'clearInterval'] })
+    try {
+      await renderReady(20)
 
-    fireEvent.click(within(screen.getByTestId('trace-tree')).getByText('claude-sonnet-4-5'))
-    await waitFor(() => expect(sessionsApi.getTraceCall).toHaveBeenCalledTimes(1))
-    await waitFor(() => expect(vi.mocked(sessionsApi.getTrace).mock.calls.length).toBeGreaterThanOrEqual(3))
+      fireEvent.click(within(screen.getByTestId('trace-tree')).getByText('claude-sonnet-4-5'))
+      await waitFor(() => expect(sessionsApi.getTraceCall).toHaveBeenCalledTimes(1))
+      expect(sessionsApi.getTrace).toHaveBeenCalledTimes(1)
+      expect(sessionsApi.getMessages).toHaveBeenCalledTimes(1)
 
-    await screen.findByText('claude-sonnet-4-5 x2')
-    expect(vi.mocked(sessionsApi.getTraceCall).mock.calls.length).toBeGreaterThan(1)
-    const detail = within(screen.getByTestId('trace-detail'))
-    expect(detail.getByRole('heading', { level: 2, name: 'claude-sonnet-4-5' })).toBeInTheDocument()
+      for (const expectedTraceCalls of [2, 3]) {
+        await act(async () => { await vi.advanceTimersByTimeAsync(20) })
+        expect(sessionsApi.getTrace).toHaveBeenCalledTimes(expectedTraceCalls)
+        expect(sessionsApi.getMessages).toHaveBeenCalledTimes(1)
+        expect(screen.queryByText('claude-sonnet-4-5 x2')).not.toBeInTheDocument()
+      }
+
+      await act(async () => { await vi.advanceTimersByTimeAsync(20) })
+      expect(sessionsApi.getTrace).toHaveBeenCalledTimes(4)
+      expect(sessionsApi.getMessages).toHaveBeenCalledTimes(2)
+      expect(screen.getByText('claude-sonnet-4-5 x2')).toBeInTheDocument()
+      expect(vi.mocked(sessionsApi.getTraceCall).mock.calls.length).toBeGreaterThan(1)
+      const detail = within(screen.getByTestId('trace-detail'))
+      expect(detail.getByRole('heading', { level: 2, name: 'claude-sonnet-4-5' })).toBeInTheDocument()
+    } finally {
+      cleanup()
+      vi.useRealTimers()
+    }
   })
 
   it('does not refetch full messages for identical trace polls', async () => {
diff --git a/scripts/pr/pr-quality-workflow.test.ts b/scripts/pr/pr-quality-workflow.test.ts
index 9acff32c..95ef9eb5 100644
--- a/scripts/pr/pr-quality-workflow.test.ts
+++ b/scripts/pr/pr-quality-workflow.test.ts
@@ -4,7 +4,7 @@ import { parse } from 'yaml'
 
 type WorkflowJob = {
   needs?: string | string[]
-  steps?: Array<{ name?: string; run?: string }>
+  steps?: Array<{ name?: string; run?: string; 'working-directory'?: string }>
 }
 
 function workflowJobs(workflow: string) {
@@ -70,6 +70,17 @@ describe('PR quality workflow', () => {
     }
   })
 
+  test('installs adapter dependencies before root server tests that import adapters', () => {
+    const jobs = workflowJobs(readFileSync('.github/workflows/pr-quality.yml', 'utf8'))
+    const steps = jobs['server-checks'].steps ?? []
+    const adapterInstall = steps.findIndex(step =>
+      step['working-directory'] === 'adapters' && step.run === 'bun install --frozen-lockfile',
+    )
+    const serverCheck = steps.findIndex(step => step.run === 'bun run check:server')
+    expect(adapterInstall).toBeGreaterThanOrEqual(0)
+    expect(adapterInstall).toBeLessThan(serverCheck)
+  })
+
   test('keeps coverage artifacts observable in CI', () => {
     const workflow = readFileSync('.github/workflows/pr-quality.yml', 'utf8')