diff --git a/src/__tests__/clone.test.ts b/src/__tests__/clone.test.ts
new file mode 100644
index 0000000..b370bab
--- /dev/null
+++ b/src/__tests__/clone.test.ts
@@ -0,0 +1,170 @@
+/**
+ * Tests for clone module (cloneAndIsolate git config propagation)
+ */
+
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('node:child_process', () => ({
+  execFileSync: vi.fn(),
+}));
+
+vi.mock('node:fs', () => ({
+  default: {
+    mkdirSync: vi.fn(),
+    mkdtempSync: vi.fn(),
+    writeFileSync: vi.fn(),
+    existsSync: vi.fn(),
+  },
+  mkdirSync: vi.fn(),
+  mkdtempSync: vi.fn(),
+  writeFileSync: vi.fn(),
+  existsSync: vi.fn(),
+}));
+
+vi.mock('../utils/debug.js', () => ({
+  createLogger: () => ({
+    info: vi.fn(),
+    debug: vi.fn(),
+    error: vi.fn(),
+  }),
+}));
+
+vi.mock('../config/globalConfig.js', () => ({
+  loadGlobalConfig: vi.fn(() => ({})),
+}));
+
+import { execFileSync } from 'node:child_process';
+import { createSharedClone, createTempCloneForBranch } from '../task/clone.js';
+
+const mockExecFileSync = vi.mocked(execFileSync);
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe('cloneAndIsolate git config propagation', () => {
+  /**
+   * Helper: set up mockExecFileSync to simulate git commands.
+   * Returns a record of git config --set calls on the clone.
+   */
+  function setupMock(localConfigs: Record<string, string>) {
+    const configSetCalls: { key: string; value: string }[] = [];
+
+    mockExecFileSync.mockImplementation((cmd, args, opts) => {
+      const argsArr = args as string[];
+      const options = opts as { cwd?: string };
+
+      // git clone
+      if (argsArr[0] === 'clone') {
+        return Buffer.from('');
+      }
+
+      // git remote remove origin
+      if (argsArr[0] === 'remote' && argsArr[1] === 'remove') {
+        return Buffer.from('');
+      }
+
+      // git config --local <key> (reading from source repo)
+      if (argsArr[0] === 'config' && argsArr[1] === '--local') {
+        const key = argsArr[2];
+        if (key in localConfigs) {
+          return Buffer.from(localConfigs[key] + '\n');
+        }
+        throw new Error(`key ${key} not set`);
+      }
+
+      // git config <key> <value> (writing to clone)
+      if (argsArr[0] === 'config' && argsArr.length === 3 && argsArr[1] !== '--local') {
+        configSetCalls.push({ key: argsArr[1], value: argsArr[2] });
+        return Buffer.from('');
+      }
+
+      // git rev-parse --verify (branchExists check)
+      if (argsArr[0] === 'rev-parse') {
+        throw new Error('branch not found');
+      }
+
+      // git checkout -b (new branch)
+      if (argsArr[0] === 'checkout') {
+        return Buffer.from('');
+      }
+
+      return Buffer.from('');
+    });
+
+    return configSetCalls;
+  }
+
+  it('should propagate user.name and user.email from source repo to clone', () => {
+    // Given: source repo has local user.name and user.email
+    const configSetCalls = setupMock({
+      'user.name': 'Test User',
+      'user.email': 'test@example.com',
+    });
+
+    // When: creating a shared clone
+    createSharedClone('/project', {
+      worktree: '/tmp/clone-dest',
+      taskSlug: 'test-task',
+    });
+
+    // Then: both user.name and user.email are set on the clone
+    expect(configSetCalls).toContainEqual({ key: 'user.name', value: 'Test User' });
+    expect(configSetCalls).toContainEqual({ key: 'user.email', value: 'test@example.com' });
+  });
+
+  it('should skip config propagation when source repo has no local user config', () => {
+    // Given: source repo has no local user.name or user.email
+    const configSetCalls = setupMock({});
+
+    // When: creating a shared clone
+    createSharedClone('/project', {
+      worktree: '/tmp/clone-dest',
+      taskSlug: 'test-task',
+    });
+
+    // Then: no git config set calls are made for user settings
+    expect(configSetCalls).toHaveLength(0);
+  });
+
+  it('should propagate only user.name when user.email is not set', () => {
+    // Given: source repo has only user.name
+    const configSetCalls = setupMock({
+      'user.name': 'Test User',
+    });
+
+    // When: creating a shared clone
+    createSharedClone('/project', {
+      worktree: '/tmp/clone-dest',
+      taskSlug: 'test-task',
+    });
+
+    // Then: only user.name is set on the clone
+    expect(configSetCalls).toEqual([{ key: 'user.name', value: 'Test User' }]);
+  });
+
+  it('should propagate git config when using createTempCloneForBranch', () => {
+    // Given: source repo has local user config
+    const configSetCalls = setupMock({
+      'user.name': 'Temp User',
+      'user.email': 'temp@example.com',
+    });
+
+    // Adjust mock to allow checkout of existing branch
+    const originalImpl = mockExecFileSync.getMockImplementation()!;
+    mockExecFileSync.mockImplementation((cmd, args, opts) => {
+      const argsArr = args as string[];
+      if (argsArr[0] === 'checkout' && argsArr[1] === 'existing-branch') {
+        return Buffer.from('');
+      }
+      return originalImpl(cmd, args, opts);
+    });
+
+    // When: creating a temp clone for a branch
+    createTempCloneForBranch('/project', 'existing-branch');
+
+    // Then: git config is propagated
+    expect(configSetCalls).toContainEqual({ key: 'user.name', value: 'Temp User' });
+    expect(configSetCalls).toContainEqual({ key: 'user.email', value: 'temp@example.com' });
+  });
+});
diff --git a/src/task/clone.ts b/src/task/clone.ts
index b99e1df..bda5d63 100644
--- a/src/task/clone.ts
+++ b/src/task/clone.ts
@@ -108,6 +108,24 @@ function cloneAndIsolate(projectDir: string, clonePath: string): void {
     cwd: clonePath,
     stdio: 'pipe',
   });
+
+  // Propagate local git user config from source repo to clone
+  for (const key of ['user.name', 'user.email']) {
+    try {
+      const value = execFileSync('git', ['config', '--local', key], {
+        cwd: projectDir,
+        stdio: 'pipe',
+      }).toString().trim();
+      if (value) {
+        execFileSync('git', ['config', key, value], {
+          cwd: clonePath,
+          stdio: 'pipe',
+        });
+      }
+    } catch {
+      // not set locally — skip
+    }
+  }
 }
 
 /**