diff --git a/.github/workflows/pr-quality.yml b/.github/workflows/pr-quality.yml
index 61a6c826..83b8f57c 100644
--- a/.github/workflows/pr-quality.yml
+++ b/.github/workflows/pr-quality.yml
@@ -245,6 +245,21 @@ jobs:
       - name: Run desktop native checks
         run: bun run check:native
 
+  macos-swift-checks:
+    name: macos-swift-checks
+    needs: scope-plan
+    if: needs.scope-plan.outputs.desktop_native_checks == 'true'
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version-file: package.json
+      - name: Run macOS Swift checks
+        run: bun run check:swift
+
   persistence-checks:
     name: persistence-checks
     needs: scope-plan
@@ -336,6 +351,7 @@ jobs:
       - agent-flow-checks
       - adapter-checks
       - desktop-native-checks
+      - macos-swift-checks
       - persistence-checks
       - docs-checks
       - coverage-checks
@@ -380,6 +396,7 @@ jobs:
           require_selected "agent-flow-checks" "${{ needs.scope-plan.outputs.agent_flow_checks }}" "${{ needs.agent-flow-checks.result }}"
           require_selected "adapter-checks" "${{ needs.scope-plan.outputs.adapter_checks }}" "${{ needs.adapter-checks.result }}"
           require_selected "desktop-native-checks" "${{ needs.scope-plan.outputs.desktop_native_checks }}" "${{ needs.desktop-native-checks.result }}"
+          require_selected "macos-swift-checks" "${{ needs.scope-plan.outputs.desktop_native_checks }}" "${{ needs.macos-swift-checks.result }}"
           require_selected "persistence-checks" "${{ needs.scope-plan.outputs.persistence_checks }}" "${{ needs.persistence-checks.result }}"
           require_selected "docs-checks" "${{ needs.scope-plan.outputs.docs_checks }}" "${{ needs.docs-checks.result }}"
           require_selected "coverage-checks" "${{ needs.scope-plan.outputs.coverage_checks }}" "${{ needs.coverage-checks.result }}"
diff --git a/package.json b/package.json
index 57bbd7fd..5307da22 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "perf:local-index:10k": "bun run scripts/perf/local-index-benchmark.ts --sessions 10000 --runs 20",
     "check:pr": "bun run scripts/pr/check-pr.ts",
     "check:impact": "bun run scripts/pr/impact-report.ts",
-    "check:policy": "bun test ./scripts/pr/bun-test-filter.test.ts ./scripts/pr/change-policy.test.ts ./scripts/pr/changed-files.test.ts ./scripts/pr/dead-imports.test.ts ./scripts/pr/module-graph.test.ts ./scripts/pr/pr-triage-workflow.test.ts ./scripts/pr/pr-quality-workflow.test.ts ./scripts/pr/release-workflow.test.ts ./scripts/pr/quality-contract.test.ts ./scripts/pr/test-environment.test.ts ./scripts/release-update-metadata.test.ts ./scripts/git-hooks/install.test.ts ./scripts/quality-gate/quarantine.test.ts ./scripts/quality-gate/coverage.test.ts ./scripts/quality-gate/provider-smoke/execute.test.ts ./scripts/quality-gate/desktop-smoke/execute.test.ts ./scripts/quality-gate/providerTargets.test.ts ./scripts/quality-gate/runner.test.ts ./scripts/quality-gate/sandbox.test.ts ./scripts/quality-gate/agent-flow/scenarios.test.ts ./scripts/quality-gate/agent-flow/live.test.ts ./scripts/quality-gate/desktop-smoke/deterministic.test.ts ./scripts/quality-gate/computer-use-live-smoke.test.ts",
+    "check:policy": "bun test ./scripts/pr/bun-test-filter.test.ts ./scripts/pr/change-policy.test.ts ./scripts/pr/changed-files.test.ts ./scripts/pr/dead-imports.test.ts ./scripts/pr/module-graph.test.ts ./scripts/pr/pr-triage-workflow.test.ts ./scripts/pr/pr-quality-workflow.test.ts ./scripts/pr/release-workflow.test.ts ./scripts/pr/quality-contract.test.ts ./scripts/pr/test-environment.test.ts ./scripts/pr/run-swift-checks.test.ts ./scripts/release-update-metadata.test.ts ./scripts/git-hooks/install.test.ts ./scripts/quality-gate/quarantine.test.ts ./scripts/quality-gate/coverage.test.ts ./scripts/quality-gate/provider-smoke/execute.test.ts ./scripts/quality-gate/desktop-smoke/execute.test.ts ./scripts/quality-gate/providerTargets.test.ts ./scripts/quality-gate/runner.test.ts ./scripts/quality-gate/sandbox.test.ts ./scripts/quality-gate/agent-flow/scenarios.test.ts ./scripts/quality-gate/agent-flow/live.test.ts ./scripts/quality-gate/desktop-smoke/deterministic.test.ts ./scripts/quality-gate/computer-use-live-smoke.test.ts",
     "check:server": "bun run scripts/pr/run-server-tests.ts",
     "check:provider-contract": "bun run scripts/pr/run-provider-contract-tests.ts",
     "check:chat-contract": "bun run scripts/pr/run-chat-contract-tests.ts",
@@ -44,7 +44,7 @@
     "docs:build": "npm --prefix site run build",
     "docs:preview": "npm --prefix site run preview",
     "check:agent-flow:live": "bun run scripts/quality-gate/agent-flow/live-cli.ts",
-    "check:swift": "swift test --package-path native/cu-helper --enable-xctest",
+    "check:swift": "bun run scripts/pr/run-swift-checks.ts",
     "check:computer-use-live-smoke": "bun run scripts/quality-gate/computer-use-live-smoke.ts"
   },
   "dependencies": {
diff --git a/scripts/pr/pr-quality-workflow.test.ts b/scripts/pr/pr-quality-workflow.test.ts
index 705e432d..1338de04 100644
--- a/scripts/pr/pr-quality-workflow.test.ts
+++ b/scripts/pr/pr-quality-workflow.test.ts
@@ -3,6 +3,9 @@ import { readFileSync } from 'node:fs'
 import { parse } from 'yaml'
 
 type WorkflowJob = {
+  if?: string
+  'runs-on'?: string
+  'continue-on-error'?: boolean
   needs?: string | string[]
   steps?: Array<{ name?: string; run?: string; 'working-directory'?: string }>
 }
@@ -62,6 +65,7 @@ describe('PR quality workflow', () => {
       'agent-flow-checks',
       'adapter-checks',
       'desktop-native-checks',
+      'macos-swift-checks',
       'persistence-checks',
       'docs-checks',
       'coverage-checks',
@@ -92,6 +96,55 @@ describe('PR quality workflow', () => {
     }
   })
 
+  test('requires macOS Swift checks alongside the selected Linux native packaging lane', () => {
+    const jobs = workflowJobs(readFileSync('.github/workflows/pr-quality.yml', 'utf8'))
+    const packageJson = JSON.parse(readFileSync('package.json', 'utf8')) as { scripts: Record<string, string> }
+    const macos = jobs['macos-swift-checks']!
+    const linux = jobs['desktop-native-checks']!
+    const gate = jobs['pr-quality-gate']!
+    expect(macos['runs-on']).toBe('macos-latest')
+    expect(linux['runs-on']).toBe('ubuntu-22.04')
+    for (const job of [macos, linux]) {
+      expect(job.needs).toBe('scope-plan')
+      expect(job.if).toBe("needs.scope-plan.outputs.desktop_native_checks == 'true'")
+      expect(job['continue-on-error']).not.toBe(true)
+    }
+    expect(macos.steps?.some(step => step.run === 'bun run check:swift')).toBe(true)
+    expect(linux.steps?.some(step => step.run === 'bun run check:native')).toBe(true)
+    expect(gate.needs).toContain('macos-swift-checks')
+    expect(gate.needs).toContain('desktop-native-checks')
+    expect(packageJson.scripts['check:swift']).toBe('bun run scripts/pr/run-swift-checks.ts')
+    expect(packageJson.scripts['check:policy']).toContain('scripts/pr/run-swift-checks.test.ts')
+    for (const command of ['check:swift', 'build:sidecars', 'test:compiled-sidecar-smoke', 'check:electron', 'electron:package:dir', 'test:package-smoke:current']) {
+      expect(packageJson.scripts['check:native']).toContain(`bun run ${command}`)
+    }
+  })
+
+  test.each([
+    { selected: true, macos: 'success', linux: 'success', exit: 0 },
+    { selected: true, macos: 'failure', linux: 'success', exit: 1 },
+    { selected: true, macos: 'skipped', linux: 'success', exit: 1 },
+    { selected: true, macos: 'success', linux: 'failure', exit: 1 },
+    { selected: false, macos: 'skipped', linux: 'skipped', exit: 0 },
+    { selected: false, macos: 'success', linux: 'skipped', exit: 1 },
+  ])('enforces both native results in the stable gate: %j', scenario => {
+    const jobs = workflowJobs(readFileSync('.github/workflows/pr-quality.yml', 'utf8'))
+    const gateScript = jobs['pr-quality-gate']!.steps!.find(step => step.run?.includes('require_selected'))!.run!
+    const script = gateScript.replace(/\$\{\{\s*([^}]+?)\s*\}\}/g, (_match, expression: string) => {
+      if (expression === 'needs.scope-plan.outputs.desktop_native_checks') return String(scenario.selected)
+      if (expression.startsWith('needs.scope-plan.outputs.')) return 'false'
+      if (expression === 'needs.macos-swift-checks.result') return scenario.macos
+      if (expression === 'needs.desktop-native-checks.result') return scenario.linux
+      if (expression === 'needs.scope-plan.result' || expression === 'needs.policy-enforcement.result') return 'success'
+      return 'skipped'
+    })
+    const result = Bun.spawnSync(['bash', '-c', script], {
+      env: { PATH: process.env.PATH ?? '' },
+      stdout: 'pipe', stderr: 'pipe',
+    })
+    expect(result.exitCode, new TextDecoder().decode(result.stdout)).toBe(scenario.exit)
+  })
+
   test('keeps coverage artifacts observable in CI', () => {
     const workflow = readFileSync('.github/workflows/pr-quality.yml', 'utf8')
 
diff --git a/scripts/pr/run-swift-checks.test.ts b/scripts/pr/run-swift-checks.test.ts
new file mode 100644
index 00000000..7b624910
--- /dev/null
+++ b/scripts/pr/run-swift-checks.test.ts
@@ -0,0 +1,46 @@
+import { describe, expect, mock, test } from 'bun:test'
+import { existsSync, writeFileSync } from 'node:fs'
+import { isAbsolute, join } from 'node:path'
+import { runSwiftChecks } from './run-swift-checks'
+
+describe('Swift platform checks', () => {
+  test.each(['linux', 'win32'] as const)('does not invoke the macOS-only package on %s', async platform => {
+    const run = mock(async () => { throw new Error('Swift cannot run on this fixture platform') })
+    expect(await runSwiftChecks({ platform, run })).toBe(0)
+    expect(run).not.toHaveBeenCalled()
+  })
+
+  test.each([0, 7])('runs the full macOS package in isolation and propagates exit %s', async exitCode => {
+    let home = ''
+    const run = mock(async (command: string[], options: { cwd: string; env: Record<string, string> }) => {
+      home = options.env.HOME!
+      expect(command.slice(0, 2)).toEqual(['swift', 'test'])
+      expect(command).toContain('--enable-xctest')
+      expect(command[command.indexOf('--package-path') + 1]).toBe(join(options.cwd, 'native/cu-helper'))
+      expect(command[command.indexOf('--scratch-path') + 1]).toBe(join(home, 'build'))
+      expect(isAbsolute(options.cwd)).toBe(true)
+      expect(home).not.toBe(process.env.HOME)
+      expect(options.env.CLAUDE_CONFIG_DIR).toBe(join(home, '.claude'))
+      expect(options.env.ANTHROPIC_API_KEY).toBeUndefined()
+      expect(options.env.ANTHROPIC_AUTH_TOKEN).toBeUndefined()
+      expect(options.env.GH_TOKEN).toBeUndefined()
+      writeFileSync(join(home, 'cleanup-fixture'), 'disposable Swift test output')
+      return exitCode
+    })
+    expect(await runSwiftChecks({ platform: 'darwin', run })).toBe(exitCode)
+    expect(run).toHaveBeenCalledTimes(1)
+    expect(existsSync(home)).toBe(false)
+  })
+
+  test('cleans the sandbox and reports a Swift launch failure', async () => {
+    let home = ''
+    await expect(runSwiftChecks({
+      platform: 'darwin',
+      run: async (_command, options) => {
+        home = options.env.HOME!
+        throw new Error('swift executable unavailable')
+      },
+    })).rejects.toThrow('swift executable unavailable')
+    expect(existsSync(home)).toBe(false)
+  })
+})
diff --git a/scripts/pr/run-swift-checks.ts b/scripts/pr/run-swift-checks.ts
new file mode 100644
index 00000000..f0283541
--- /dev/null
+++ b/scripts/pr/run-swift-checks.ts
@@ -0,0 +1,41 @@
+#!/usr/bin/env bun
+
+import { mkdtempSync, rmSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join, resolve } from 'node:path'
+import { createSandboxedTestEnvironment } from './test-environment'
+
+type SwiftCheckRunner = (
+  command: string[],
+  options: { cwd: string; env: Record<string, string> },
+) => Promise<number>
+
+export async function runSwiftChecks(options: {
+  platform?: NodeJS.Platform
+  run?: SwiftCheckRunner
+} = {}): Promise<number> {
+  const platform = options.platform ?? process.platform
+  if (platform !== 'darwin') {
+    console.log(`[swift-checks] not applicable on ${platform}: cu-helper targets macOS; PR CI requires the macOS Swift job separately`)
+    return 0
+  }
+
+  const root = resolve(import.meta.dir, '../..')
+  const sandboxHome = mkdtempSync(join(tmpdir(), 'cc-haha-swift-checks-'))
+  const run = options.run ?? (async (command, spawnOptions) => {
+    const child = Bun.spawn(command, { ...spawnOptions, stdout: 'inherit', stderr: 'inherit' })
+    return await child.exited
+  })
+  try {
+    return await run([
+      'swift', 'test',
+      '--package-path', join(root, 'native/cu-helper'),
+      '--scratch-path', join(sandboxHome, 'build'),
+      '--enable-xctest',
+    ], { cwd: root, env: createSandboxedTestEnvironment(sandboxHome) })
+  } finally {
+    rmSync(sandboxHome, { recursive: true, force: true })
+  }
+}
+
+if (import.meta.main) process.exit(await runSwiftChecks())