diff --git a/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityBuildStatusWriterTest.cs b/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityBuildStatusWriterTest.cs
index 0ba25db..e7b7c2c 100644
--- a/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityBuildStatusWriterTest.cs
+++ b/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityBuildStatusWriterTest.cs
@@ -20,6 +20,12 @@ public void TestBuildNumber()
             DoTest(x => x.WriteBuildNumber("100500.5"), "##teamcity[buildNumber '100500.5']");
         }
 
+        [Test]
+        public void TestBuildProblemWithoutIdentity()
+        {
+            DoTest(x => x.WriteBuildProblem("aaaa"), "##teamcity[buildProblem description='aaaa']");
+        }
+
         [Test]
         public void TestBuildProblem()
         {
diff --git a/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityProgressWriterTest.cs b/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityProgressWriterTest.cs
new file mode 100644
index 0000000..5c2c88a
--- /dev/null
+++ b/TeamCity.ServiceMessages.Tests/Write/Specials/TeamCityProgressWriterTest.cs
@@ -0,0 +1,29 @@
+namespace JetBrains.TeamCity.ServiceMessages.Tests.Write.Specials
+{
+    using NUnit.Framework;
+    using ServiceMessages.Write.Special;
+    using ServiceMessages.Write.Special.Impl.Writer;
+
+    [TestFixture]
+    public class TeamCityProgressWriterTest : TeamCityWriterBaseTest<ITeamCityProgressWriter>
+    {
+        protected override ITeamCityProgressWriter Create(IServiceMessageProcessor proc)
+        {
+            return new TeamCityProgressWriter(proc);
+        }
+
+        [Test]
+        public void TestProgressMessage()
+        {
+            DoTest(x => x.WriteProgress("aaaa"), "##teamcity[progressMessage 'aaaa']");
+        }
+
+        [Test]
+        public void OpenProgressBlock()
+        {
+            DoTest(x => x.OpenProgress("aaaa").Dispose(),
+                "##teamcity[progressStart 'aaaa']",
+                "##teamcity[progressFinish 'aaaa']");
+        }
+    }
+}
\ No newline at end of file
diff --git a/TeamCity.ServiceMessages/TeamCity.ServiceMessages.csproj b/TeamCity.ServiceMessages/TeamCity.ServiceMessages.csproj
index 2dc16d9..5cc8a61 100644
--- a/TeamCity.ServiceMessages/TeamCity.ServiceMessages.csproj
+++ b/TeamCity.ServiceMessages/TeamCity.ServiceMessages.csproj
@@ -12,7 +12,7 @@
     <GenerateAssemblyVersionAttribute>true</GenerateAssemblyVersionAttribute>
     <GenerateNeutralResourcesLanguageAttribute>true</GenerateNeutralResourcesLanguageAttribute>
 
-    <TargetFrameworks>netstandard1.3;net35;net40;net45;netcoreapp1.0;netcoreapp2.0;netcoreapp3.0</TargetFrameworks>
+    <TargetFrameworks>netstandard1.3;netstandard2.0;net35;net40;net45;netcoreapp1.0;netcoreapp2.0;netcoreapp3.0;net6.0;net8.0</TargetFrameworks>
     <AssemblyName>TeamCity.ServiceMessages</AssemblyName>
     <PackageId>TeamCity.ServiceMessages</PackageId>
     <RootNamespace>JetBrains.TeamCity.ServiceMessages</RootNamespace>
diff --git a/TeamCity.ServiceMessages/Write/Special/ITeamCityBuildStatusWriter.cs b/TeamCity.ServiceMessages/Write/Special/ITeamCityBuildStatusWriter.cs
index 6a35f2e..8a3375e 100644
--- a/TeamCity.ServiceMessages/Write/Special/ITeamCityBuildStatusWriter.cs
+++ b/TeamCity.ServiceMessages/Write/Special/ITeamCityBuildStatusWriter.cs
@@ -18,6 +18,12 @@ public interface ITeamCityBuildStatusWriter
         void WriteBuildNumber([NotNull] string buildNumber);
 
 
+        /// <summary>
+        /// Generates build problem service message
+        /// </summary>
+        /// <param name="description">problem message</param>
+        void WriteBuildProblem([NotNull] string description);
+
         /// <summary>
         /// Generates build problem service message
         /// </summary>
diff --git a/TeamCity.ServiceMessages/Write/Special/ITeamCityFlowWriter.cs b/TeamCity.ServiceMessages/Write/Special/ITeamCityFlowWriter.cs
index cd64b9a..83863bb 100644
--- a/TeamCity.ServiceMessages/Write/Special/ITeamCityFlowWriter.cs
+++ b/TeamCity.ServiceMessages/Write/Special/ITeamCityFlowWriter.cs
@@ -6,9 +6,9 @@ namespace JetBrains.TeamCity.ServiceMessages.Write.Special
 
     /// <summary>
     /// Starts another flowId reporting starting. This call would emmit
-    /// <pre>##teamcity[flowStarted flowId='%lt;new flow id>' parent='current flow id']</pre>
+    /// <pre>##teamcity[flowStarted flowId='&lt;new flow id>' parent='current flow id']</pre>
     /// and
-    /// <pre>##teamcity[flowFinished flowId='%lt;new flow id>']</pre>
+    /// <pre>##teamcity[flowFinished flowId='&lt;new flow id>']</pre>
     /// on writer dispose
     /// </summary>
     /// <remarks>
diff --git a/TeamCity.ServiceMessages/Write/Special/ITeamCityProgressWriter.cs b/TeamCity.ServiceMessages/Write/Special/ITeamCityProgressWriter.cs
new file mode 100644
index 0000000..974cf5a
--- /dev/null
+++ b/TeamCity.ServiceMessages/Write/Special/ITeamCityProgressWriter.cs
@@ -0,0 +1,41 @@
+namespace JetBrains.TeamCity.ServiceMessages.Write.Special
+{
+    using System;
+
+    /// <summary>
+    /// <para>
+    /// Use <see cref="WriteProgress"/> method to add progress message
+    /// <pre>
+    ///     ##teamcity[progressMessage '&lt;message text>' ]
+    /// </pre>
+    /// </para>
+    ///
+    /// <para>
+    /// Use <see cref="OpenProgress"/> method to add progress message
+    /// <pre>##teamcity[progressStart '&lt;message>']</pre>
+    /// and
+    /// <pre>##teamcity[progressFinish '&lt;message>']</pre>
+    /// on writer dispose.
+    /// </para>
+    /// <para>
+    /// http://confluence.jetbrains.net/display/TCD18/Build+Script+Interaction+with+TeamCity#BuildScriptInteractionwithTeamCity-ReportingMessagesForBuildLog
+    /// </para>
+    /// </summary>
+    /// <remarks>
+    /// Implementation is not thread-safe. Create an instance for each thread instead.
+    /// </remarks>
+    public interface ITeamCityProgressWriter
+    {
+        /// <summary>
+        /// Writes normal message
+        /// </summary>
+        /// <param name="message">text</param>
+        void WriteProgress([NotNull] string message);
+
+        /// <summary>
+        /// Generates start flow message and returns disposable object to close flow
+        /// </summary>
+        /// <returns></returns>
+        IDisposable OpenProgress(string message);
+    }
+}
\ No newline at end of file
diff --git a/TeamCity.ServiceMessages/Write/Special/ITeamCityWriter.cs b/TeamCity.ServiceMessages/Write/Special/ITeamCityWriter.cs
index 852ea7a..09db964 100644
--- a/TeamCity.ServiceMessages/Write/Special/ITeamCityWriter.cs
+++ b/TeamCity.ServiceMessages/Write/Special/ITeamCityWriter.cs
@@ -13,7 +13,7 @@ namespace JetBrains.TeamCity.ServiceMessages.Write.Special
     /// <remarks>
     /// Implementation is not thread-safe. Create an instance for each thread instead.
     /// </remarks>
-    public interface ITeamCityWriter : ITeamCityBlockWriter<ITeamCityWriter>, ITeamCityFlowWriter<ITeamCityWriter>, ITeamCityMessageWriter, ITeamCityTestsWriter, ITeamCityCompilationBlockWriter<ITeamCityWriter>, ITeamCityArtifactsWriter, ITeamCityBuildStatusWriter, IDisposable
+    public interface ITeamCityWriter : ITeamCityBlockWriter<ITeamCityWriter>, ITeamCityFlowWriter<ITeamCityWriter>, ITeamCityMessageWriter, ITeamCityTestsWriter, ITeamCityCompilationBlockWriter<ITeamCityWriter>, ITeamCityArtifactsWriter, ITeamCityBuildStatusWriter, ITeamCityProgressWriter, IDisposable
     {
         /// <summary>
         /// Allows sending bare service message
diff --git a/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterFacade.cs b/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterFacade.cs
index f1c9b98..57bd859 100644
--- a/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterFacade.cs
+++ b/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterFacade.cs
@@ -14,6 +14,7 @@ public class TeamCityWriterFacade : ITeamCityWriter
         private readonly ITeamCityMessageWriter _messageWriter;
         private readonly IServiceMessageProcessor _processor;
         private readonly ITeamCityBuildStatusWriter _statusWriter;
+        private readonly ITeamCityProgressWriter _progressWriter;
         private readonly ITeamCityTestsWriter _testsWriter;
         private volatile bool _isDisposed;
 
@@ -26,6 +27,7 @@ public TeamCityWriterFacade(
             [NotNull] ITeamCityArtifactsWriter artifactsWriter,
             [NotNull] ITeamCityBuildStatusWriter statusWriter,
             [NotNull] ITeamCityFlowWriter<ITeamCityWriter> flowWriter,
+            [NotNull] ITeamCityProgressWriter progressWriter,
             [NotNull] IDisposable disposeCallback)
         {
             if (processor == null) throw new ArgumentNullException(nameof(processor));
@@ -36,6 +38,7 @@ public TeamCityWriterFacade(
             if (artifactsWriter == null) throw new ArgumentNullException(nameof(artifactsWriter));
             if (statusWriter == null) throw new ArgumentNullException(nameof(statusWriter));
             if (flowWriter == null) throw new ArgumentNullException(nameof(flowWriter));
+            if (progressWriter == null) throw new ArgumentNullException(nameof(progressWriter));
             if (disposeCallback == null) throw new ArgumentNullException(nameof(disposeCallback));
             _processor = processor;
             _blockWriter = blockWriter;
@@ -45,6 +48,7 @@ public TeamCityWriterFacade(
             _artifactsWriter = artifactsWriter;
             _statusWriter = statusWriter;
             _flowWriter = flowWriter;
+            _progressWriter = progressWriter;
             _dispose = disposeCallback;
         }
 
@@ -61,6 +65,13 @@ public void WriteBuildNumber(string buildNumber)
             _statusWriter.WriteBuildNumber(buildNumber);
         }
 
+        public void WriteBuildProblem(string description)
+        {
+            if (description == null) throw new ArgumentNullException(nameof(description));
+            CheckConsistency();
+            _statusWriter.WriteBuildProblem(description);
+        }
+
         public void WriteBuildProblem(string identity, string message)
         {
             if (identity == null) throw new ArgumentNullException(nameof(identity));
@@ -106,6 +117,20 @@ public void WriteError(string text, string errorDetails = null)
             _messageWriter.WriteError(text, errorDetails);
         }
 
+        public void WriteProgress(string message)
+        {
+            if (message == null) throw new ArgumentNullException(nameof(message));
+            CheckConsistency();
+            _progressWriter.WriteProgress(message);
+        }
+
+        public IDisposable OpenProgress(string message)
+        {
+            if (message == null) throw new ArgumentNullException(nameof(message));
+            CheckConsistency();
+            return _progressWriter.OpenProgress(message);
+        }
+
         public virtual void Dispose()
         {
             _isDisposed = true;
diff --git a/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterImpl.cs b/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterImpl.cs
index b440164..68680ca 100644
--- a/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterImpl.cs
+++ b/TeamCity.ServiceMessages/Write/Special/Impl/TeamCityWriterImpl.cs
@@ -21,6 +21,7 @@ public TeamCityWriterImpl(
                 new TeamCityMessageWriter(processor),
                 new TeamCityArtifactsWriter(processor),
                 new TeamCityBuildStatusWriter(processor),
+                new TeamCityProgressWriter(processor),
                 dispose)
         {
             if (processor == null) throw new ArgumentNullException(nameof(processor));
@@ -36,8 +37,9 @@ private TeamCityWriterImpl(
             [NotNull] ITeamCityMessageWriter messageWriter,
             [NotNull] ITeamCityArtifactsWriter artifactsWriter,
             [NotNull] ITeamCityBuildStatusWriter statusWriter,
+            [NotNull] ITeamCityProgressWriter progressWriter,
             [NotNull] IDisposable dispose)
-            : base(processor, blockWriter, compilationWriter, testsWriter, messageWriter, artifactsWriter, statusWriter, flowWriter, dispose)
+            : base(processor, blockWriter, compilationWriter, testsWriter, messageWriter, artifactsWriter, statusWriter, flowWriter,  progressWriter, dispose)
         {
             if (processor == null) throw new ArgumentNullException(nameof(processor));
             if (flowWriter == null) throw new ArgumentNullException(nameof(flowWriter));
@@ -47,6 +49,7 @@ private TeamCityWriterImpl(
             if (messageWriter == null) throw new ArgumentNullException(nameof(messageWriter));
             if (artifactsWriter == null) throw new ArgumentNullException(nameof(artifactsWriter));
             if (statusWriter == null) throw new ArgumentNullException(nameof(statusWriter));
+            if (progressWriter == null) throw new ArgumentNullException(nameof(progressWriter));
             if (dispose == null) throw new ArgumentNullException(nameof(dispose));
             _writeCheck = new ISubWriter[] {blockWriter, compilationWriter, testsWriter, flowWriter};
         }
diff --git a/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityBuildStatusWriter.cs b/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityBuildStatusWriter.cs
index 0eb60fa..2d5dec9 100644
--- a/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityBuildStatusWriter.cs
+++ b/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityBuildStatusWriter.cs
@@ -18,6 +18,12 @@ public void WriteBuildNumber(string buildNumber)
             PostMessage(new ValueServiceMessage("buildNumber", buildNumber));
         }
 
+        public void WriteBuildProblem(string description)
+        {
+            if (description == null) throw new ArgumentNullException(nameof(description));
+            PostMessage(new ServiceMessage("buildProblem") {{"description", description}});
+        }
+
         public void WriteBuildProblem(string identity, string message)
         {
             if (identity == null) throw new ArgumentNullException(nameof(identity));
diff --git a/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityFlowWriter.cs b/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityFlowWriter.cs
index a26120a..fc5a455 100644
--- a/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityFlowWriter.cs
+++ b/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityFlowWriter.cs
@@ -38,7 +38,7 @@ public TCloseBlock OpenFlow()
                 processor
             );
 
-            //##teamcity[flowStarted flowId='%lt;new flow id>' parent='current flow id']
+            //##teamcity[flowStarted flowId='<new flow id>' parent='current flow id']
             var flowStartedMessage = new ServiceMessage("flowStarted");
             if (myTarget.FlowId != null)
             {
@@ -69,7 +69,7 @@ private void CloseBlock([NotNull] IFlowAwareServiceMessageProcessor flowAwareSer
 
             _openChildFlowIds.Remove(flowAwareServiceMessageProcessor.FlowId);
 
-            //##teamcity[flowFinished flowId='%lt;new flow id>']
+            //##teamcity[flowFinished flowId='<new flow id>']
             flowAwareServiceMessageProcessor.AddServiceMessage(new ServiceMessage("flowFinished"));
         }
     }
diff --git a/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityProgressWriter.cs b/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityProgressWriter.cs
new file mode 100644
index 0000000..b283735
--- /dev/null
+++ b/TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityProgressWriter.cs
@@ -0,0 +1,26 @@
+namespace JetBrains.TeamCity.ServiceMessages.Write.Special.Impl.Writer
+{
+    using System;
+
+    public class TeamCityProgressWriter : BaseWriter, ITeamCityProgressWriter
+    {
+        public TeamCityProgressWriter(IServiceMessageProcessor target)
+            : base(target)
+        {
+            if (target == null) throw new ArgumentNullException(nameof(target));
+        }
+
+        public void WriteProgress(string message)
+        {
+            if (message == null) throw new ArgumentNullException(nameof(message));
+            PostMessage(new ValueServiceMessage("progressMessage", message));
+        }
+
+        public IDisposable OpenProgress(string message)
+        {
+            if (message == null) throw new ArgumentNullException(nameof(message));
+            PostMessage(new ValueServiceMessage("progressStart", message));
+            return new DisposableDelegate(() => PostMessage(new ValueServiceMessage("progressFinish", message)));
+        }
+    }
+}
\ No newline at end of file