diff --git a/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Services/ContentPublishOperationServiceContractTests.cs b/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Services/ContentPublishOperationServiceContractTests.cs
new file mode 100644
index 0000000000..a95b805a8a
--- /dev/null
+++ b/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Services/ContentPublishOperationServiceContractTests.cs
@@ -0,0 +1,169 @@
+using System.ComponentModel;
+using NUnit.Framework;
+using Umbraco.Cms.Core.Models;
+using Umbraco.Cms.Core.Services;
+
+namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Core.Services;
+
+/// <summary>
+/// Contract tests for IContentPublishOperationService interface.
+/// These tests verify interface design and expected behaviors.
+/// </summary>
+[TestFixture]
+public class ContentPublishOperationServiceContractTests
+{
+    [Test]
+    public void IContentPublishOperationService_Inherits_From_IService()
+    {
+        // Assert
+        Assert.That(typeof(IService).IsAssignableFrom(typeof(IContentPublishOperationService)), Is.True);
+    }
+
+    [Test]
+    public void Publish_Method_Exists_With_Expected_Signature()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.Publish),
+            new[] { typeof(IContent), typeof(string[]), typeof(int) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(PublishResult)));
+    }
+
+    [Test]
+    public void Unpublish_Method_Exists_With_Expected_Signature()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.Unpublish),
+            new[] { typeof(IContent), typeof(string), typeof(int) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(PublishResult)));
+    }
+
+    [Test]
+    public void PublishBranch_Method_Exists_With_Expected_Signature()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.PublishBranch),
+            new[] { typeof(IContent), typeof(PublishBranchFilter), typeof(string[]), typeof(int) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(IEnumerable<PublishResult>)));
+    }
+
+    [Test]
+    public void PerformScheduledPublish_Method_Exists_With_Expected_Signature()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.PerformScheduledPublish),
+            new[] { typeof(DateTime) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(IEnumerable<PublishResult>)));
+    }
+
+    [Test]
+    public void GetContentScheduleByContentId_IntOverload_Exists()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.GetContentScheduleByContentId),
+            new[] { typeof(int) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(ContentScheduleCollection)));
+    }
+
+    [Test]
+    public void GetContentScheduleByContentId_GuidOverload_Exists()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.GetContentScheduleByContentId),
+            new[] { typeof(Guid) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(ContentScheduleCollection)));
+    }
+
+    [Test]
+    public void IsPathPublishable_Method_Exists()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.IsPathPublishable),
+            new[] { typeof(IContent) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(bool)));
+    }
+
+    [Test]
+    public void IsPathPublished_Method_Exists()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.IsPathPublished),
+            new[] { typeof(IContent) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(bool)));
+    }
+
+    [Test]
+    public void SendToPublication_Method_Exists()
+    {
+        // Arrange
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.SendToPublication),
+            new[] { typeof(IContent), typeof(int) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(bool)));
+    }
+
+    [Test]
+    public void CommitDocumentChanges_Method_Exists_With_NotificationState_Parameter()
+    {
+        // Arrange - Critical Review Option A: Exposed for orchestration
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.CommitDocumentChanges),
+            new[] { typeof(IContent), typeof(int), typeof(IDictionary<string, object?>) });
+
+        // Assert
+        Assert.That(methodInfo, Is.Not.Null);
+        Assert.That(methodInfo!.ReturnType, Is.EqualTo(typeof(PublishResult)));
+    }
+
+    [Test]
+    public void CommitDocumentChanges_Has_EditorBrowsable_Advanced_Attribute()
+    {
+        // Arrange - Should be hidden from IntelliSense by default
+        var methodInfo = typeof(IContentPublishOperationService).GetMethod(
+            nameof(IContentPublishOperationService.CommitDocumentChanges),
+            new[] { typeof(IContent), typeof(int), typeof(IDictionary<string, object?>) });
+
+        // Act
+        var attribute = methodInfo?.GetCustomAttributes(typeof(EditorBrowsableAttribute), false)
+            .Cast<EditorBrowsableAttribute>()
+            .FirstOrDefault();
+
+        // Assert
+        Assert.That(attribute, Is.Not.Null);
+        Assert.That(attribute!.State, Is.EqualTo(EditorBrowsableState.Advanced));
+    }
+}