diff --git a/__tests__/index.test.js b/__tests__/index.test.js
index c6f7f94..2a3e2ef 100644
--- a/__tests__/index.test.js
+++ b/__tests__/index.test.js
@@ -128,6 +128,84 @@ describe('Azure DevOps Commit Validator', () => {
       // Restore context
       mockContext.payload.pull_request = originalPR;
     });
+
+    it('should fail if both check-commits and check-pull-request are false', async () => {
+      mockGetInput.mockImplementation(name => {
+        if (name === 'check-commits') return 'false';
+        if (name === 'check-pull-request') return 'false';
+        if (name === 'github-token') return 'github-token';
+        return 'false';
+      });
+
+      await run();
+
+      expect(mockSetFailed).toHaveBeenCalledWith(
+        "At least one of 'check-commits' or 'check-pull-request' must be set to true. Both are currently set to false."
+      );
+    });
+
+    it('should pass when only check-commits is enabled', async () => {
+      mockGetInput.mockImplementation(name => {
+        if (name === 'check-commits') return 'true';
+        if (name === 'check-pull-request') return 'false';
+        if (name === 'github-token') return 'github-token';
+        if (name === 'fail-if-missing-workitem-commit-link') return 'false';
+        return 'false';
+      });
+
+      mockOctokit.rest.pulls.listCommits.mockResolvedValue({
+        data: []
+      });
+
+      await run();
+
+      expect(mockSetFailed).not.toHaveBeenCalled();
+    });
+
+    it('should pass when only check-pull-request is enabled', async () => {
+      mockGetInput.mockImplementation(name => {
+        if (name === 'check-commits') return 'false';
+        if (name === 'check-pull-request') return 'true';
+        if (name === 'github-token') return 'github-token';
+        return 'false';
+      });
+
+      mockOctokit.rest.pulls.get.mockResolvedValue({
+        data: {
+          title: 'Test PR AB#123',
+          body: 'Test body'
+        }
+      });
+
+      await run();
+
+      expect(mockSetFailed).not.toHaveBeenCalled();
+    });
+
+    it('should pass when both checks are enabled', async () => {
+      mockGetInput.mockImplementation(name => {
+        if (name === 'check-commits') return 'true';
+        if (name === 'check-pull-request') return 'true';
+        if (name === 'github-token') return 'github-token';
+        if (name === 'fail-if-missing-workitem-commit-link') return 'false';
+        return 'false';
+      });
+
+      mockOctokit.rest.pulls.listCommits.mockResolvedValue({
+        data: []
+      });
+
+      mockOctokit.rest.pulls.get.mockResolvedValue({
+        data: {
+          title: 'Test PR AB#123',
+          body: 'Test body'
+        }
+      });
+
+      await run();
+
+      expect(mockSetFailed).not.toHaveBeenCalled();
+    });
   });
 
   describe('Commit validation', () => {
diff --git a/src/index.js b/src/index.js
index fa41214..fd7587a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -39,6 +39,14 @@ export async function run() {
     const commentOnFailure = core.getInput('comment-on-failure') === 'true';
     const validateWorkItemExistsFlag = core.getInput('validate-work-item-exists') === 'true';
 
+    // Validate that at least one check is enabled
+    if (!checkPullRequest && !checkCommits) {
+      core.setFailed(
+        "At least one of 'check-commits' or 'check-pull-request' must be set to true. Both are currently set to false."
+      );
+      return;
+    }
+
     // Get context
     const context = github.context;
     const pullNumber = context.payload.pull_request?.number;