코드 탭 컨텍스트 격차를 해소하고 대화 영속 작업 세트를 도입함

- ChatConversation에 CodeWorkingSetSnapshot/진단/시맨틱 요약 상태를 추가하고 AgentLoop가 실행 중 갱신한 작업 세트를 대화에 다시 저장하도록 연결함
- CodeTaskWorkingSetService를 스냅샷 복원/시맨틱 연속성 요약/활성 진단 보호 구조로 확장하고 query assembly에서 working set·semantic summary·workspace bootstrap을 protected evidence로 주입하도록 보강함
- ContextCondenser가 compact 중 MsgId, preview, 토큰 메타데이터를 유지하도록 수정하고 신규 compact marker와 요약 문자열을 영어 안정형으로 정리함
- ChatSessionStateService의 분기 대화가 MsgId와 CodeWorkingSet을 유지하도록 보강하고 관련 회귀 테스트(ChatStorage/ContextCondenser/PreLlmStage/QueryAssembly/WorkingSet)를 추가 및 갱신함
- 검증: dotnet build 경고 0 오류 0, CodeTaskWorkingSetServiceTests|AgentLoopQueryAssemblyServiceTests|AgentQueryContextBuilderTests|ContextCondenserTests|AxAgentExecutionEngineTests|AgentLoopLlmDispatchStageServiceTests|ChatStorageServiceTests 26개 통과, AgentLoopE2ETests 포함 관련 컨텍스트 회귀 56개 통과

README.md

@@ -1,5 +1,16 @@
 # AX Commander
 
+- Update: 2026-04-16 09:12 (KST)
+- Closed the remaining Code-tab context gap by persisting a durable conversation-owned `CodeWorkingSetSnapshot` and rehydrating it on the next Code run.
+- `src/AxCopilot/Models/ChatModels.cs`, `src/AxCopilot/Services/Agent/CodeTaskWorkingSetService.cs`, `src/AxCopilot/Services/Agent/AgentLoopService.cs`, `src/AxCopilot/Services/Agent/AgentLoopCodeWorkingSetPersistence.cs`, and `src/AxCopilot/Views/ChatWindow.xaml.cs` now keep Code continuity across follow-up turns, tab switches, resume, and post-build recovery loops.
+- `src/AxCopilot/Services/Agent/AgentLoopQueryAssemblyService.cs`, `src/AxCopilot/Services/Agent/AgentLoopLlmRequestPreparationService.cs`, `src/AxCopilot/Services/Agent/AgentQueryContextBuilder.cs`, and `src/AxCopilot/Services/Agent/AgentLoopContextReliability.cs` now inject and log protected Code evidence layers for the working set, semantic summary, active diagnostics, and workspace bootstrap context.
+- `src/AxCopilot/Services/Agent/ContextCondenser.cs` now preserves `MsgId`, preview metadata, and token metadata when compacting messages, and newly written compact markers are emitted with stable English strings instead of mixed legacy markers.
+- `src/AxCopilot/Services/ChatSessionStateService.cs` now preserves `CodeWorkingSet` and `MsgId` when branching conversations so forked Code threads do not regress to flat-root scaffolding.
+- Verification:
+  - `dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_code_context_gap_closure_final\\ -p:IntermediateOutputPath=obj\\verify_code_context_gap_closure_final\\` warning 0 / error 0
+  - `dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter "CodeTaskWorkingSetServiceTests|AgentLoopQueryAssemblyServiceTests|AgentQueryContextBuilderTests|ContextCondenserTests|AxAgentExecutionEngineTests|AgentLoopLlmDispatchStageServiceTests|ChatStorageServiceTests" -p:OutputPath=bin\\verify_code_context_gap_closure_tests\\ -p:IntermediateOutputPath=obj\\verify_code_context_gap_closure_tests\\` passed 26
+  - `dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter "AgentLoopE2ETests|AgentMessageInvariantHelperTests|AgentLoopPreLlmStageServiceTests|AgentLoopLlmRequestPreparationServiceTests|AgentLoopQueryAssemblyServiceTests|CodeTaskWorkingSetServiceTests|ContextCondenserTests|AxAgentExecutionEngineTests|ChatStorageServiceTests|AgentQueryContextBuilderTests" -p:OutputPath=bin\\verify_code_context_gap_closure_tests2\\ -p:IntermediateOutputPath=obj\\verify_code_context_gap_closure_tests2\\` passed 56
+
 - Update: 2026-04-16 08:10 (KST)
 - Merged the external work-log changes recorded in `E:\AX Copilot - Claude\.claude\worktrees\vibrant-mendeleev\docs\WORK_LOG_2026-04-15_22h_to_2026-04-16.md` into the local Code tab implementation.
 - The current branch already superseded the external context-persistence track in `AxAgentExecutionEngine` and `AgentQueryContextBuilder`, so the merge focused on the missing Code stats surface instead of overwriting the newer local context pipeline.

docs/CODE_CONTEXT_RELIABILITY_PLAN.md

@@ -1,5 +1,31 @@
 # Code Context Reliability Plan
 
+Update: 2026-04-16 09:12 (KST)
+
+- Implemented the remaining continuity gap-closure items that were still open after the earlier staged loop refactor:
+  - durable conversation-owned `CodeWorkingSetSnapshot`
+  - semantic Code tool-batch continuity summaries
+  - compact-safe `MsgId` and preview metadata preservation
+  - query-context diagnostics for working-set injection, semantic-summary injection, protected diagnostics, compact-boundary use, and legacy-boundary fallback detection
+  - workspace-context bootstrap injection for Code requests when `.ax-context.md` is already available
+- The active implementation now spans:
+  - `src/AxCopilot/Models/ChatModels.cs`
+  - `src/AxCopilot/Services/Agent/CodeTaskWorkingSetService.cs`
+  - `src/AxCopilot/Services/Agent/AgentLoopService.cs`
+  - `src/AxCopilot/Services/Agent/AgentLoopCodeWorkingSetPersistence.cs`
+  - `src/AxCopilot/Services/Agent/AgentLoopQueryAssemblyService.cs`
+  - `src/AxCopilot/Services/Agent/AgentLoopLlmRequestPreparationService.cs`
+  - `src/AxCopilot/Services/Agent/AgentQueryContextBuilder.cs`
+  - `src/AxCopilot/Services/Agent/AgentLoopContextReliability.cs`
+  - `src/AxCopilot/Services/Agent/ContextCondenser.cs`
+  - `src/AxCopilot/Services/ChatSessionStateService.cs`
+  - `src/AxCopilot/Views/ChatWindow.xaml.cs`
+- Remaining follow-up after this wave is now smaller and mainly optional:
+  - broaden the workspace bootstrap path from `LoadContext(...)` reuse into a fuller stale-check refresh only if Code runs show it is still needed
+  - continue cleaning low-traffic legacy mojibake comments and dormant compatibility strings as those files are touched again
+  - evaluate whether the durable Code working set should surface in future debug tooling or exports
+  - keep measuring tool-trace repair frequency in longer real Code sessions to confirm the new durable snapshot and semantic summary blocks reduce repair churn
+
 Update: 2026-04-16 07:40 (KST)
 
 - Closed the main gaps that were still open versus the comparison checklist:

docs/DEVELOPMENT.md

@@ -1908,3 +1908,22 @@ UI ?遺우쁽????域뱀뮆???귐뗫솯?醫딆춦 ???袁る퓮 ?臾믩씜 ??疫
 - 테스트: `src/AxCopilot.Tests/Services/CodeStatsAggregatorTests.cs`
 - 검증: `dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_code_stats_merge\\ -p:IntermediateOutputPath=obj\\verify_code_stats_merge\\` 경고 0 / 오류 0
 - 검증: `dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter "CodeStatsAggregatorTests|AxAgentExecutionEngineTests|AgentQueryContextBuilderTests|ContextCondenserTests|SettingsServiceTests" -p:OutputPath=bin\\verify_code_stats_merge_tests\\ -p:IntermediateOutputPath=obj\\verify_code_stats_merge_tests\\` 통과 56
+업데이트: 2026-04-16 09:12 (KST)
+- Code context continuity was hardened with a durable `CodeWorkingSetSnapshot` that is now owned by `ChatConversation` and refreshed throughout Code runs.
+- `src/AxCopilot/Models/ChatModels.cs` added `CodeWorkingSetSnapshot`, `CodeWorkingSetDiagnosticSnapshot`, and `CodeWorkingSetSemanticSummary`, and `ChatConversation` now persists the snapshot through the normal encrypted conversation save path.
+- `src/AxCopilot/Services/Agent/CodeTaskWorkingSetService.cs` now restores snapshots, emits a dedicated semantic summary block, tracks active diagnostics and recent writes as protected evidence, and publishes only materially changed snapshots.
+- `src/AxCopilot/Services/Agent/AgentLoopService.cs`, `src/AxCopilot/Services/Agent/AgentLoopCodeWorkingSetPersistence.cs`, and `src/AxCopilot/Views/ChatWindow.xaml.cs` now hydrate the Code working set at loop start, publish updates during tool execution, and persist the latest Code snapshot back into the owning conversation.
+- `src/AxCopilot/Services/Agent/AgentLoopQueryAssemblyService.cs`, `src/AxCopilot/Services/Agent/AgentLoopLlmRequestPreparationService.cs`, `src/AxCopilot/Services/Agent/AgentQueryContextBuilder.cs`, and `src/AxCopilot/Services/Agent/AgentLoopContextReliability.cs` now inject and log Code-specific protected evidence for the working set, semantic continuity, active diagnostics, compact-boundary state, legacy marker fallback use, and workspace bootstrap context.
+- `src/AxCopilot/Services/Agent/ContextCondenser.cs` now preserves `MsgId`, preview metadata, response timing, and token metadata during compaction, while newly written compaction markers and summaries use stable English strings.
+- `src/AxCopilot/Services/ChatSessionStateService.cs` now preserves `CodeWorkingSet` and `MsgId` when branching conversations so forked Code threads keep the same repair chain.
+- Tests:
+  - `src/AxCopilot.Tests/Services/CodeTaskWorkingSetServiceTests.cs`
+  - `src/AxCopilot.Tests/Services/ChatStorageServiceTests.cs`
+  - `src/AxCopilot.Tests/Services/ContextCondenserTests.cs`
+  - `src/AxCopilot.Tests/Services/AgentLoopQueryAssemblyServiceTests.cs`
+  - `src/AxCopilot.Tests/Services/AgentLoopPreLlmStageServiceTests.cs`
+  - `src/AxCopilot.Tests/Services/AgentLoopLlmDispatchStageServiceTests.cs`
+- Verification:
+  - `dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_code_context_gap_closure_final\\ -p:IntermediateOutputPath=obj\\verify_code_context_gap_closure_final\\` warning 0 / error 0
+  - `dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter "CodeTaskWorkingSetServiceTests|AgentLoopQueryAssemblyServiceTests|AgentQueryContextBuilderTests|ContextCondenserTests|AxAgentExecutionEngineTests|AgentLoopLlmDispatchStageServiceTests|ChatStorageServiceTests" -p:OutputPath=bin\\verify_code_context_gap_closure_tests\\ -p:IntermediateOutputPath=obj\\verify_code_context_gap_closure_tests\\` passed 26
+  - `dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter "AgentLoopE2ETests|AgentMessageInvariantHelperTests|AgentLoopPreLlmStageServiceTests|AgentLoopLlmRequestPreparationServiceTests|AgentLoopQueryAssemblyServiceTests|CodeTaskWorkingSetServiceTests|ContextCondenserTests|AxAgentExecutionEngineTests|ChatStorageServiceTests|AgentQueryContextBuilderTests" -p:OutputPath=bin\\verify_code_context_gap_closure_tests2\\ -p:IntermediateOutputPath=obj\\verify_code_context_gap_closure_tests2\\` passed 56

src/AxCopilot.Tests/Services/AgentLoopLlmDispatchStageServiceTests.cs

@@ -95,7 +95,11 @@ public class AgentLoopLlmDispatchStageServiceTests
             InjectedToolReminder: false,
             SupplementalMessageCount: 0,
             FlattenedStructuredAssistantCount: 0,
-            ConvertedOrphanToolResultCount: 0);
+            ConvertedOrphanToolResultCount: 0,
+            InjectedCodeWorkingSet: false,
+            InjectedSemanticSummary: false,
+            ProtectedActiveDiagnostics: false,
+            InjectedWorkspaceContext: false);
 
         var result = await service.ExecuteAsync(
             new AgentLoopLlmDispatchStageInput(
@@ -172,7 +176,11 @@ public class AgentLoopLlmDispatchStageServiceTests
             InjectedToolReminder: false,
             SupplementalMessageCount: 0,
             FlattenedStructuredAssistantCount: 0,
-            ConvertedOrphanToolResultCount: 0);
+            ConvertedOrphanToolResultCount: 0,
+            InjectedCodeWorkingSet: false,
+            InjectedSemanticSummary: false,
+            ProtectedActiveDiagnostics: false,
+            InjectedWorkspaceContext: false);
         var context = new AgentContext { WorkFolder = @"E:\code", ActiveTab = "Code" };
 
         await service.ExecuteAsync(

src/AxCopilot.Tests/Services/AgentLoopPreLlmStageServiceTests.cs

@@ -161,7 +161,8 @@ public class AgentLoopPreLlmStageServiceTests
             RuntimeAllowedToolCount: 0));
 
         result.LlmRequest.Should().NotBeNull();
-        result.LlmRequest!.SupplementalMessageCount.Should().Be(1);
+        result.LlmRequest!.SupplementalMessageCount.Should().Be(2);
         result.LlmRequest.SendMessages.Should().Contain(message => message.MetaKind == "code_working_set");
+        result.LlmRequest.SendMessages.Should().Contain(message => message.MetaKind == "code_semantic_summary");
     }
 }

src/AxCopilot.Tests/Services/AgentLoopQueryAssemblyServiceTests.cs

@@ -93,8 +93,11 @@ public class AgentLoopQueryAssemblyServiceTests
             injectPreCallToolReminder: true,
             noToolCallLoopRetry: 0);
 
-        result.SupplementalMessageCount.Should().Be(1);
+        result.SupplementalMessageCount.Should().Be(2);
         result.SendMessages.Should().Contain(message => message.MetaKind == "code_working_set");
+        result.SendMessages.Should().Contain(message => message.MetaKind == "code_semantic_summary");
+        result.InjectedCodeWorkingSet.Should().BeTrue();
+        result.InjectedSemanticSummary.Should().BeTrue();
         result.SendMessages.Last().Content.Should().Contain("[TOOL_REQUIRED]");
     }
 }

src/AxCopilot.Tests/Services/ChatStorageServiceTests.cs

@@ -173,4 +173,62 @@ public class ChatStorageServiceTests
             DeleteConversationFile(conversationId);
         }
     }
+
+    [Fact]
+    public void SaveAndLoad_ShouldRoundTripCodeWorkingSetSnapshot()
+    {
+        var conversationId = "code-working-set-" + Guid.NewGuid().ToString("N");
+        try
+        {
+            var storage = new ChatStorageService();
+            var conversation = new ChatConversation
+            {
+                Id = conversationId,
+                Title = "Code working set persistence",
+                Tab = "Code",
+                CodeWorkingSet = new CodeWorkingSetSnapshot
+                {
+                    Goal = "Fix the WPF build",
+                    WorkFolder = @"E:\code",
+                    ScaffoldProfileLabel = "WPF MVVM",
+                    StartedFromEmptyWorkspace = true,
+                    CreatedDirectories = ["Views", "ViewModels"],
+                    RecentWrites = ["Views/MainWindow.xaml"],
+                    ActiveDiagnostics =
+                    [
+                        new CodeWorkingSetDiagnosticSnapshot
+                        {
+                            ToolName = "build_run",
+                            FilePath = "Views/MainWindow.xaml",
+                            LineNumber = 10,
+                            Code = "MC3089",
+                            Message = "Duplicate property."
+                        }
+                    ],
+                    LatestSemanticSummary = new CodeWorkingSetSemanticSummary
+                    {
+                        Kind = "verification_failed",
+                        ToolName = "build_run",
+                        Summary = "Verification failed with MC3089.",
+                        Paths = ["Views/MainWindow.xaml"]
+                    }
+                }
+            };
+
+            storage.Save(conversation);
+            var loaded = storage.Load(conversationId);
+
+            loaded.Should().NotBeNull();
+            loaded!.CodeWorkingSet.Should().NotBeNull();
+            loaded.CodeWorkingSet!.Goal.Should().Be("Fix the WPF build");
+            loaded.CodeWorkingSet.ActiveDiagnostics.Should().ContainSingle();
+            loaded.CodeWorkingSet.ActiveDiagnostics[0].Code.Should().Be("MC3089");
+            loaded.CodeWorkingSet.LatestSemanticSummary.Should().NotBeNull();
+            loaded.CodeWorkingSet.LatestSemanticSummary!.Summary.Should().Contain("MC3089");
+        }
+        finally
+        {
+            DeleteConversationFile(conversationId);
+        }
+    }
 }

src/AxCopilot.Tests/Services/CodeTaskWorkingSetServiceTests.cs

@@ -89,4 +89,41 @@ public class CodeTaskWorkingSetServiceTests
         message.Should().NotBeNull();
         message!.Content.Should().NotContain("CS0017");
     }
+
+    [Fact]
+    public void SnapshotRoundTrip_ShouldPreserveSemanticSummaryAndDiagnostics()
+    {
+        var original = new CodeTaskWorkingSetService(
+            "Create a WPF app",
+            @"E:\code",
+            "WPF MVVM",
+            startedFromEmptyWorkspace: true);
+
+        using var mkdirDoc = JsonDocument.Parse("""{"action":"mkdir","paths":["Views","ViewModels"]}""");
+        original.RecordToolResult("file_manage", mkdirDoc.RootElement, ToolResult.Ok("created structure"));
+        original.RecordToolResult("build_run", null, new ToolResult
+        {
+            Success = false,
+            Output = @"E:\code\Views\MainWindow.xaml(10,5): error MC3089: Duplicate property"
+        });
+
+        original.TryBuildUpdatedSnapshot(out var snapshot).Should().BeTrue();
+        snapshot.Should().NotBeNull();
+
+        var restored = new CodeTaskWorkingSetService(
+            "Create a WPF app",
+            @"E:\code",
+            "WPF MVVM",
+            startedFromEmptyWorkspace: true,
+            snapshot);
+
+        var message = restored.BuildChatMessage();
+        var semanticMessage = restored.BuildSemanticSummaryMessage();
+
+        message.Should().NotBeNull();
+        message!.Content.Should().Contain("Views");
+        message.Content.Should().Contain("MC3089");
+        semanticMessage.Should().NotBeNull();
+        semanticMessage!.Content.Should().Contain("verification_failed");
+    }
 }

src/AxCopilot.Tests/Services/ContextCondenserTests.cs

@@ -54,10 +54,12 @@ public class ContextCondenserTests
         changed.Should().BeTrue();
         messages.Any(m =>
         {
-            var c = m.Content ?? "";
+            var content = m.Content ?? "";
-            return c.Contains("[축약됨", StringComparison.Ordinal)
+            return content.Contains("[truncated]", StringComparison.Ordinal)
-                || c.Contains("[time-based", StringComparison.Ordinal)
+                   || content.Contains("[time-based", StringComparison.Ordinal)
-                || c.Contains("이전 내용 축약됨", StringComparison.Ordinal);
+                   || content.Contains("[previous content truncated", StringComparison.Ordinal)
+                   || content.Contains("[previous tool result compaction", StringComparison.Ordinal)
+                   || content.Contains("[previous execution bundle compaction", StringComparison.Ordinal);
         }).Should().BeTrue();
     }
 
@@ -69,6 +71,30 @@ public class ContextCondenserTests
         resolved.Should().Be(900_000);
     }
 
+    [Fact]
+    public async Task CondenseIfNeededAsync_ShouldPreserveMessageIdentityForCompactedMessages()
+    {
+        var settings = new SettingsService();
+        settings.Settings.Llm.Service = "ollama";
+        settings.Settings.Llm.Model = "test-model";
+
+        using var llm = new LlmService(settings);
+        var messages = BuildLargeConversation();
+        var originalId = messages[2].MsgId;
+
+        var changed = await ContextCondenser.CondenseIfNeededAsync(
+            messages,
+            llm,
+            maxOutputTokens: 2_000,
+            proactiveEnabled: true,
+            triggerPercent: 80,
+            force: false,
+            CancellationToken.None);
+
+        changed.Should().BeTrue();
+        messages.Should().Contain(message => message.MsgId == originalId);
+    }
+
     private static List<ChatMessage> BuildLargeConversation()
     {
         var largeOutput = new string('A', 30_000);
@@ -76,18 +102,18 @@ public class ContextCondenserTests
 
         return
         [
-            new ChatMessage { Role = "system", Content = "system prompt" },
+            new ChatMessage { MsgId = "system-1", Role = "system", Content = "system prompt" },
-            new ChatMessage { Role = "user", Content = "첫 질문" },
+            new ChatMessage { MsgId = "user-1", Role = "user", Content = "first request" },
-            new ChatMessage { Role = "assistant", Content = toolJson }, // Keep the large payload in the old segment.
+            new ChatMessage { MsgId = "assistant-large", Role = "assistant", Content = toolJson },
-            new ChatMessage { Role = "assistant", Content = "첫 답변" },
+            new ChatMessage { MsgId = "assistant-2", Role = "assistant", Content = "first reply" },
-            new ChatMessage { Role = "user", Content = "둘째 질문" },
+            new ChatMessage { MsgId = "user-2", Role = "user", Content = "follow-up request" },
-            new ChatMessage { Role = "assistant", Content = "둘째 답변" },
+            new ChatMessage { MsgId = "assistant-3", Role = "assistant", Content = "follow-up reply" },
-            new ChatMessage { Role = "user", Content = "셋째 질문" },
+            new ChatMessage { MsgId = "user-3", Role = "user", Content = "third request" },
-            new ChatMessage { Role = "assistant", Content = "셋째 답변" },
+            new ChatMessage { MsgId = "assistant-4", Role = "assistant", Content = "third reply" },
-            new ChatMessage { Role = "user", Content = "넷째 질문" },
+            new ChatMessage { MsgId = "user-4", Role = "user", Content = "fourth request" },
-            new ChatMessage { Role = "assistant", Content = "넷째 답변" },
+            new ChatMessage { MsgId = "assistant-5", Role = "assistant", Content = "fourth reply" },
-            new ChatMessage { Role = "user", Content = "다섯째 질문" },
+            new ChatMessage { MsgId = "user-5", Role = "user", Content = "fifth request" },
-            new ChatMessage { Role = "assistant", Content = "다섯째 답변" },
+            new ChatMessage { MsgId = "assistant-6", Role = "assistant", Content = "fifth reply" },
         ];
     }
 }

src/AxCopilot/Models/ChatModels.cs

@@ -191,6 +191,87 @@ public class ChatConversation
 
     [JsonPropertyName("postCompactionCompletionTokens")]
     public int PostCompactionCompletionTokens { get; set; }
+
+    [JsonPropertyName("codeWorkingSet")]
+    public CodeWorkingSetSnapshot? CodeWorkingSet { get; set; }
+}
+
+public class CodeWorkingSetSnapshot
+{
+    [JsonPropertyName("goal")]
+    public string Goal { get; set; } = "";
+
+    [JsonPropertyName("workFolder")]
+    public string WorkFolder { get; set; } = "";
+
+    [JsonPropertyName("scaffoldProfileLabel")]
+    public string? ScaffoldProfileLabel { get; set; }
+
+    [JsonPropertyName("startedFromEmptyWorkspace")]
+    public bool StartedFromEmptyWorkspace { get; set; }
+
+    [JsonPropertyName("createdDirectories")]
+    public List<string> CreatedDirectories { get; set; } = new();
+
+    [JsonPropertyName("recentReads")]
+    public List<string> RecentReads { get; set; } = new();
+
+    [JsonPropertyName("recentWrites")]
+    public List<string> RecentWrites { get; set; } = new();
+
+    [JsonPropertyName("activeDiagnostics")]
+    public List<CodeWorkingSetDiagnosticSnapshot> ActiveDiagnostics { get; set; } = new();
+
+    [JsonPropertyName("environmentSummary")]
+    public string? EnvironmentSummary { get; set; }
+
+    [JsonPropertyName("nextFocus")]
+    public string? NextFocus { get; set; }
+
+    [JsonPropertyName("lastMutationSummary")]
+    public string? LastMutationSummary { get; set; }
+
+    [JsonPropertyName("latestSemanticSummary")]
+    public CodeWorkingSetSemanticSummary? LatestSemanticSummary { get; set; }
+
+    [JsonPropertyName("updatedAt")]
+    public DateTime UpdatedAt { get; set; } = DateTime.Now;
+}
+
+public class CodeWorkingSetDiagnosticSnapshot
+{
+    [JsonPropertyName("toolName")]
+    public string ToolName { get; set; } = "";
+
+    [JsonPropertyName("filePath")]
+    public string FilePath { get; set; } = "";
+
+    [JsonPropertyName("lineNumber")]
+    public int? LineNumber { get; set; }
+
+    [JsonPropertyName("code")]
+    public string Code { get; set; } = "";
+
+    [JsonPropertyName("message")]
+    public string Message { get; set; } = "";
+}
+
+public class CodeWorkingSetSemanticSummary
+{
+    [JsonPropertyName("kind")]
+    public string Kind { get; set; } = "";
+
+    [JsonPropertyName("toolName")]
+    public string ToolName { get; set; } = "";
+
+    [JsonPropertyName("summary")]
+    public string Summary { get; set; } = "";
+
+    [JsonPropertyName("paths")]
+    public List<string> Paths { get; set; } = new();
+
+    [JsonPropertyName("updatedAt")]
+    public DateTime UpdatedAt { get; set; } = DateTime.Now;
 }
 
 public class ChatAgentRunRecord

src/AxCopilot/Services/Agent/AgentLoopCodeWorkingSetPersistence.cs

@@ -0,0 +1,17 @@
+using AxCopilot.Models;
+
+namespace AxCopilot.Services.Agent;
+
+public partial class AgentLoopService
+{
+    private void PublishCodeWorkingSetSnapshot(CodeTaskWorkingSetService? codeWorkingSet)
+    {
+        if (codeWorkingSet == null || CodeWorkingSetSnapshotUpdated == null)
+            return;
+
+        if (!codeWorkingSet.TryBuildUpdatedSnapshot(out var snapshot))
+            return;
+
+        CodeWorkingSetSnapshotUpdated(CodeTaskWorkingSetService.CloneSnapshot(snapshot));
+    }
+}

src/AxCopilot/Services/Agent/AgentLoopContextReliability.cs

@@ -17,6 +17,6 @@ public partial class AgentLoopService
         var toolTraceRepair = llmRequest.FlattenedStructuredAssistantCount > 0 || llmRequest.ConvertedOrphanToolResultCount > 0
             ? $"tool_trace_repair=assistants:{llmRequest.FlattenedStructuredAssistantCount}/orphan_results:{llmRequest.ConvertedOrphanToolResultCount}, "
             : "";
-        return $"{AgentLoopDiagnosticsFormatter.BuildQueryViewSummary(queryView)}, profile={queryView.ProfileName}, protected_recent={queryView.ProtectedRecentNonSystemMessages}, send={llmRequest.SendMessages.Count}, send_tokens={estimatedSendTokens}, supplemental={llmRequest.SupplementalMessageCount}, {toolTraceRepair}tool_reminder={llmRequest.InjectedToolReminder}, working_set={workingSetSummary}";
+        return $"{AgentLoopDiagnosticsFormatter.BuildQueryViewSummary(queryView)}, profile={queryView.ProfileName}, protected_recent={queryView.ProtectedRecentNonSystemMessages}, send={llmRequest.SendMessages.Count}, send_tokens={estimatedSendTokens}, supplemental={llmRequest.SupplementalMessageCount}, {toolTraceRepair}tool_reminder={llmRequest.InjectedToolReminder}, working_set={workingSetSummary}, injected_working_set={llmRequest.InjectedCodeWorkingSet}, injected_semantic_summary={llmRequest.InjectedSemanticSummary}, protected_diagnostics={llmRequest.ProtectedActiveDiagnostics}, compact_boundary={queryView.BoundaryApplied}, legacy_boundary_fallback={queryView.LegacyBoundaryFallbackUsed}, workspace_bootstrap={llmRequest.InjectedWorkspaceContext}";
     }
 }

src/AxCopilot/Services/Agent/AgentLoopLlmRequestPreparationService.cs

@@ -8,7 +8,11 @@ internal sealed record AgentLoopLlmRequestPreparationResult(
     bool InjectedToolReminder,
     int SupplementalMessageCount,
     int FlattenedStructuredAssistantCount,
-    int ConvertedOrphanToolResultCount);
+    int ConvertedOrphanToolResultCount,
+    bool InjectedCodeWorkingSet,
+    bool InjectedSemanticSummary,
+    bool ProtectedActiveDiagnostics,
+    bool InjectedWorkspaceContext);
 
 /// <summary>
 /// Builds the final LLM request array from the query window and optional
@@ -26,7 +30,15 @@ internal static class AgentLoopLlmRequestPreparationService
     {
         var sendMessages = queryMessages.Select(CloneMessage).ToList();
         var normalization = AgentMessageInvariantHelper.NormalizeHistoricalToolTrace(sendMessages);
-        var supplementalCount = AppendSupplementalMessages(sendMessages, supplementalMessages);
+        var supplementalList = PrepareSupplementalMessages(supplementalMessages);
+        var supplementalCount = AppendSupplementalMessages(sendMessages, supplementalList);
+        var injectedCodeWorkingSet = supplementalList.Any(message => string.Equals(message.MetaKind, "code_working_set", StringComparison.OrdinalIgnoreCase));
+        var injectedSemanticSummary = supplementalList.Any(message => string.Equals(message.MetaKind, "code_semantic_summary", StringComparison.OrdinalIgnoreCase));
+        var protectedActiveDiagnostics = supplementalList.Any(message =>
+            string.Equals(message.MetaKind, "code_working_set", StringComparison.OrdinalIgnoreCase)
+            && (message.Content ?? string.Empty).Contains("Active diagnostic:", StringComparison.Ordinal));
+        var injectedWorkspaceContext = supplementalList.Any(message =>
+            string.Equals(message.MetaKind, "workspace_context_bootstrap", StringComparison.OrdinalIgnoreCase));
         var forceInitialToolCall = totalToolCalls == 0 && forceInitialToolCallEnabled;
         if (!forceInitialToolCall
             || !injectPreCallToolReminder
@@ -38,7 +50,11 @@ internal static class AgentLoopLlmRequestPreparationService
                 false,
                 supplementalCount,
                 normalization.FlattenedAssistantCount,
-                normalization.ConvertedOrphanToolResultCount);
+                normalization.ConvertedOrphanToolResultCount,
+                injectedCodeWorkingSet,
+                injectedSemanticSummary,
+                protectedActiveDiagnostics,
+                injectedWorkspaceContext);
         }
 
         sendMessages.Add(BuildToolReminderMessage());
@@ -48,7 +64,11 @@ internal static class AgentLoopLlmRequestPreparationService
             true,
             supplementalCount,
             normalization.FlattenedAssistantCount,
-            normalization.ConvertedOrphanToolResultCount);
+            normalization.ConvertedOrphanToolResultCount,
+            injectedCodeWorkingSet,
+            injectedSemanticSummary,
+            protectedActiveDiagnostics,
+            injectedWorkspaceContext);
     }
 
     internal static ChatMessage BuildToolReminderMessage()
@@ -61,17 +81,25 @@ internal static class AgentLoopLlmRequestPreparationService
         };
     }
 
-    private static int AppendSupplementalMessages(List<ChatMessage> sendMessages, IEnumerable<ChatMessage>? supplementalMessages)
+    private static List<ChatMessage> PrepareSupplementalMessages(IEnumerable<ChatMessage>? supplementalMessages)
     {
         if (supplementalMessages == null)
+            return [];
+
+        return supplementalMessages
+            .Where(message => message != null && !string.IsNullOrWhiteSpace(message.Content))
+            .Select(CloneMessage)
+            .ToList();
+    }
+
+    private static int AppendSupplementalMessages(List<ChatMessage> sendMessages, IReadOnlyList<ChatMessage> supplementalMessages)
+    {
+        if (supplementalMessages.Count == 0)
             return 0;
 
         var added = 0;
         foreach (var message in supplementalMessages)
         {
-            if (message == null || string.IsNullOrWhiteSpace(message.Content))
-                continue;
-
             sendMessages.Add(CloneMessage(message));
             added++;
         }

src/AxCopilot/Services/Agent/AgentLoopQueryAssemblyService.cs

@@ -79,7 +79,41 @@ internal static class AgentLoopQueryAssemblyService
 
     private static IEnumerable<ChatMessage>? BuildSupplementalMessages(CodeTaskWorkingSetService? codeWorkingSet)
     {
-        var workingSetMessage = codeWorkingSet?.BuildChatMessage();
+        if (codeWorkingSet == null)
-        return workingSetMessage is null ? null : [workingSetMessage];
+            return null;
+
+        var messages = new List<ChatMessage>();
+        var workingSetMessage = codeWorkingSet.BuildChatMessage();
+        if (workingSetMessage != null)
+            messages.Add(workingSetMessage);
+
+        var semanticSummaryMessage = codeWorkingSet.BuildSemanticSummaryMessage();
+        if (semanticSummaryMessage != null)
+            messages.Add(semanticSummaryMessage);
+
+        var workspaceContextMessage = BuildWorkspaceContextMessage(codeWorkingSet.WorkFolder);
+        if (workspaceContextMessage != null)
+            messages.Add(workspaceContextMessage);
+
+        return messages.Count == 0 ? null : messages;
+    }
+
+    private static ChatMessage? BuildWorkspaceContextMessage(string? workFolder)
+    {
+        var workspaceContext = WorkspaceContextGenerator.LoadContext(workFolder);
+        if (string.IsNullOrWhiteSpace(workspaceContext))
+            return null;
+
+        var normalized = workspaceContext.Length <= 1200
+            ? workspaceContext
+            : workspaceContext[..1200] + "\n...(truncated)";
+
+        return new ChatMessage
+        {
+            Role = "system",
+            MetaKind = "workspace_context_bootstrap",
+            Content = "[workspace-context-bootstrap]\n" + normalized,
+            Timestamp = DateTime.Now,
+        };
     }
 }

src/AxCopilot/Services/Agent/AgentLoopService.cs

@@ -113,6 +113,10 @@ public partial class AgentLoopService
     /// </summary>
     public string? RuntimeWorkFolderOverride { get; set; }
 
+    public CodeWorkingSetSnapshot? InitialCodeWorkingSetSnapshot { get; set; }
+
+    public Action<CodeWorkingSetSnapshot?>? CodeWorkingSetSnapshotUpdated { get; set; }
+
     /// <summary>현재 대화 ID (감사 로그 기록용).</summary>
     private string _conversationId = "";
 
@@ -311,7 +315,8 @@ public partial class AgentLoopService
                 userQuery,
                 context.WorkFolder,
                 explorationState.ScaffoldProfile?.Label,
-                workspaceWasInitiallyEmpty)
+                workspaceWasInitiallyEmpty,
+                InitialCodeWorkingSetSnapshot)
             : null;
 
         var preferredInitialToolSequence = BuildPreferredInitialToolSequence(
@@ -1525,6 +1530,7 @@ public partial class AgentLoopService
                     if (!isCodeTab)
                         sessionLearnings?.TryExtract(effectiveCall.ToolName, result.Output ?? "", result.Success);
                     codeWorkingSet?.RecordToolResult(effectiveCall.ToolName, effectiveCall.ToolInput, result);
+                    PublishCodeWorkingSetSnapshot(codeWorkingSet);
 
                     if (!result.Success)
                     {

src/AxCopilot/Services/Agent/AgentQueryContextBuilder.cs

@@ -19,6 +19,7 @@ public sealed class AgentQueryContextWindowResult
     public int ProtectedRecentNonSystemMessages { get; init; }
     public int ToolResultSoftCharLimit { get; init; }
     public int ToolResultAggregateBudgetChars { get; init; }
+    public bool LegacyBoundaryFallbackUsed { get; init; }
 }
 
 /// <summary>
@@ -79,10 +80,11 @@ public static class AgentQueryContextBuilder
                 ProtectedRecentNonSystemMessages = options.ToolResultBudget.ProtectedRecentNonSystemMessages,
                 ToolResultSoftCharLimit = options.ToolResultBudget.SoftCharLimit,
                 ToolResultAggregateBudgetChars = options.ToolResultBudget.AggregateBudgetChars,
+                LegacyBoundaryFallbackUsed = false,
             };
         }
 
-        var startIndex = FindWindowStartIndex(sourceMessages, out var boundaryApplied);
+        var startIndex = FindWindowStartIndex(sourceMessages, out var boundaryApplied, out var legacyBoundaryFallbackUsed);
         var adjustedStartIndex = AgentMessageInvariantHelper.AdjustStartIndexForToolPairs(
             sourceMessages,
             startIndex,
@@ -124,24 +126,43 @@ public static class AgentQueryContextBuilder
             ProtectedRecentNonSystemMessages = options.ToolResultBudget.ProtectedRecentNonSystemMessages,
             ToolResultSoftCharLimit = options.ToolResultBudget.SoftCharLimit,
             ToolResultAggregateBudgetChars = options.ToolResultBudget.AggregateBudgetChars,
+            LegacyBoundaryFallbackUsed = legacyBoundaryFallbackUsed,
         };
     }
 
-    private static int FindWindowStartIndex(IReadOnlyList<ChatMessage> sourceMessages, out bool boundaryApplied)
+    private static int FindWindowStartIndex(IReadOnlyList<ChatMessage> sourceMessages, out bool boundaryApplied, out bool legacyBoundaryFallbackUsed)
     {
         for (var i = sourceMessages.Count - 1; i >= 0; i--)
         {
-            if (IsQueryBoundaryMarker(sourceMessages[i]))
+            if (TryIsQueryBoundaryMarker(sourceMessages[i], out var usedLegacyFallback))
             {
                 boundaryApplied = true;
+                legacyBoundaryFallbackUsed = usedLegacyFallback;
                 return i;
             }
         }
 
         boundaryApplied = false;
+        legacyBoundaryFallbackUsed = false;
         return 0;
     }
 
+    private static bool TryIsQueryBoundaryMarker(ChatMessage message, out bool usedLegacyFallback)
+    {
+        usedLegacyFallback = false;
+        if (IsQueryBoundaryMarker(message))
+        {
+            var content = message.Content ?? "";
+            usedLegacyFallback = content.StartsWith("[?댁쟾 ?€???붿빟", StringComparison.Ordinal)
+                                 || content.StartsWith("[?몄뀡 硫붾え由??뺤텞", StringComparison.Ordinal)
+                                 || content.StartsWith("[?댁쟾 ?ㅽ뻾 臾띠쓬 ?뺤텞", StringComparison.Ordinal)
+                                 || content.StartsWith("[?댁쟾 ?뺤텞 寃쎄퀎 蹂묓빀", StringComparison.Ordinal);
+            return true;
+        }
+
+        return false;
+    }
+
     private static bool IsQueryBoundaryMarker(ChatMessage message)
     {
         var metaKind = message.MetaKind ?? "";
@@ -286,7 +307,7 @@ public static class AgentQueryContextBuilder
             }
             else if (string.Equals(message.Role, "assistant", StringComparison.OrdinalIgnoreCase)
                      && (message.Content ?? string.Empty).StartsWith("{\"_tool_use_blocks\"", StringComparison.Ordinal)
-                     && TryBuildToolUseSnippet(message, out var toolUseSnippet))
+                     && TryBuildCleanToolUseSnippet(message, out var toolUseSnippet))
             {
                 snippet = toolUseSnippet;
             }
@@ -384,6 +405,16 @@ public static class AgentQueryContextBuilder
         }
     }
 
+    private static bool TryBuildCleanToolUseSnippet(ChatMessage message, out string snippet)
+    {
+        snippet = "";
+        if (!TryBuildToolUseSnippet(message, out var legacySnippet))
+            return false;
+
+        snippet = legacySnippet.Replace(" ??", " - ", StringComparison.Ordinal);
+        return true;
+    }
+
     private static string TruncateSnippet(string text)
     {
         var normalized = text.Replace('\r', ' ').Replace('\n', ' ').Trim();

src/AxCopilot/Services/Agent/CodeTaskWorkingSetService.cs

@@ -28,17 +28,22 @@ internal sealed class CodeTaskWorkingSetService
     private string _environmentSummary = "";
     private string _nextFocus = "";
     private string _lastMutationSummary = "";
+    private CodeWorkingSetSemanticSummary? _latestSemanticSummary;
+    private string _lastPublishedFingerprint = "";
 
     public CodeTaskWorkingSetService(
         string goal,
         string? workFolder,
         string? scaffoldProfileLabel,
-        bool startedFromEmptyWorkspace)
+        bool startedFromEmptyWorkspace,
+        CodeWorkingSetSnapshot? snapshot = null)
     {
         _goal = CollapseWhitespace(goal);
         _workFolder = workFolder?.Trim() ?? "";
         _scaffoldProfileLabel = scaffoldProfileLabel?.Trim() ?? "";
         _startedFromEmptyWorkspace = startedFromEmptyWorkspace;
+        RestoreSnapshot(snapshot);
+        _lastPublishedFingerprint = CreateSnapshotFingerprint(BuildSnapshotCore());
     }
 
     public void RecordToolResult(string toolName, JsonElement? toolInput, ToolResult result)
@@ -77,14 +82,82 @@ internal sealed class CodeTaskWorkingSetService
         };
     }
 
+    public ChatMessage? BuildSemanticSummaryMessage()
+    {
+        CodeWorkingSetSemanticSummary? semanticSummary;
+        lock (_lock)
+        {
+            semanticSummary = CloneSemanticSummary(_latestSemanticSummary);
+        }
+
+        if (semanticSummary == null || string.IsNullOrWhiteSpace(semanticSummary.Summary))
+            return null;
+
+        var lines = new List<string> { "[code-semantic-summary]" };
+        lines.Add($"- Kind: {semanticSummary.Kind}");
+        lines.Add($"- Summary: {semanticSummary.Summary}");
+        if (semanticSummary.Paths.Count > 0)
+            lines.Add("- Paths: " + string.Join(", ", semanticSummary.Paths));
+
+        return new ChatMessage
+        {
+            Role = "system",
+            MetaKind = "code_semantic_summary",
+            Content = string.Join("\n", lines),
+            Timestamp = semanticSummary.UpdatedAt,
+        };
+    }
+
+    public bool TryBuildUpdatedSnapshot(out CodeWorkingSetSnapshot? snapshot)
+    {
+        lock (_lock)
+        {
+            snapshot = BuildSnapshotCore();
+            var fingerprint = CreateSnapshotFingerprint(snapshot);
+            if (string.Equals(fingerprint, _lastPublishedFingerprint, StringComparison.Ordinal))
+            {
+                snapshot = null;
+                return false;
+            }
+
+            _lastPublishedFingerprint = fingerprint;
+            return true;
+        }
+    }
+
+    public static CodeWorkingSetSnapshot? CloneSnapshot(CodeWorkingSetSnapshot? snapshot)
+    {
+        if (snapshot == null)
+            return null;
+
+        return new CodeWorkingSetSnapshot
+        {
+            Goal = snapshot.Goal,
+            WorkFolder = snapshot.WorkFolder,
+            ScaffoldProfileLabel = snapshot.ScaffoldProfileLabel,
+            StartedFromEmptyWorkspace = snapshot.StartedFromEmptyWorkspace,
+            CreatedDirectories = snapshot.CreatedDirectories.ToList(),
+            RecentReads = snapshot.RecentReads.ToList(),
+            RecentWrites = snapshot.RecentWrites.ToList(),
+            ActiveDiagnostics = snapshot.ActiveDiagnostics.Select(CloneDiagnosticSnapshot).ToList(),
+            EnvironmentSummary = snapshot.EnvironmentSummary,
+            NextFocus = snapshot.NextFocus,
+            LastMutationSummary = snapshot.LastMutationSummary,
+            LatestSemanticSummary = CloneSemanticSummary(snapshot.LatestSemanticSummary),
+            UpdatedAt = snapshot.UpdatedAt,
+        };
+    }
+
     public string DescribeForLog()
     {
         lock (_lock)
         {
-            return $"writes={_recentWrites.Count}, reads={_recentReads.Count}, dirs={_createdDirectories.Count}, diagnostics={_activeDiagnostics.Count}, next={TruncateSingleLine(_nextFocus, 80)}";
+            return $"writes={_recentWrites.Count}, reads={_recentReads.Count}, dirs={_createdDirectories.Count}, diagnostics={_activeDiagnostics.Count}, semantic={_latestSemanticSummary?.Kind ?? "none"}, next={TruncateSingleLine(_nextFocus, 80)}";
         }
     }
 
+    public string WorkFolder => _workFolder;
+
     private string BuildContentCore()
     {
         var lines = new List<string> { "[code-working-set]" };
@@ -150,14 +223,32 @@ internal sealed class CodeTaskWorkingSetService
             return;
         }
 
+        var createdDirectories = new List<string>();
         foreach (var candidate in ExtractPathCandidates(toolInput))
         {
             if (LooksLikeDirectory(candidate))
-                AddRecentUnique(_createdDirectories, NormalizePath(candidate), MaxListItems);
+            {
+                var normalized = NormalizePath(candidate);
+                AddRecentUnique(_createdDirectories, normalized, MaxListItems);
+                createdDirectories.Add(normalized);
+            }
         }
 
         if (!string.IsNullOrWhiteSpace(result.FilePath) && LooksLikeDirectory(result.FilePath))
-            AddRecentUnique(_createdDirectories, NormalizePath(result.FilePath), MaxListItems);
+        {
+            var normalized = NormalizePath(result.FilePath);
+            AddRecentUnique(_createdDirectories, normalized, MaxListItems);
+            createdDirectories.Add(normalized);
+        }
+
+        if (result.Success && createdDirectories.Count > 0)
+        {
+            RecordSemanticSummary(
+                "structure",
+                toolName,
+                "Created project structure: " + string.Join(", ", createdDirectories.Distinct(StringComparer.OrdinalIgnoreCase).Take(4)),
+                createdDirectories);
+        }
     }
 
     private void TrackReads(string toolName, JsonElement? toolInput, ToolResult result)
@@ -195,6 +286,15 @@ internal sealed class CodeTaskWorkingSetService
 
         if (touchedFiles.Count > 0)
             _lastMutationSummary = "Updated " + string.Join(", ", touchedFiles.Distinct(StringComparer.OrdinalIgnoreCase).Take(3));
+
+        if (result.Success && touchedFiles.Count > 0)
+        {
+            RecordSemanticSummary(
+                "mutation",
+                toolName,
+                "Applied code changes to " + string.Join(", ", touchedFiles.Distinct(StringComparer.OrdinalIgnoreCase).Take(4)),
+                touchedFiles);
+        }
     }
 
     private void TrackDiagnostics(string toolName, ToolResult result)
@@ -202,9 +302,18 @@ internal sealed class CodeTaskWorkingSetService
         if (!IsVerificationTool(toolName))
             return;
 
+        var hadDiagnostics = _activeDiagnostics.Count > 0;
         if (result.Success)
         {
             _activeDiagnostics.Clear();
+            if (hadDiagnostics)
+            {
+                RecordSemanticSummary(
+                    "verification_resolved",
+                    toolName,
+                    "Verification passed after resolving the latest diagnostics.",
+                    _recentWrites);
+            }
             return;
         }
 
@@ -219,12 +328,22 @@ internal sealed class CodeTaskWorkingSetService
             {
                 _activeDiagnostics.Clear();
                 _activeDiagnostics.Add(new CodeDiagnostic(toolName, "", null, "", TruncateSingleLine(fallbackSummary, 180)));
+                RecordSemanticSummary(
+                    "verification_failed",
+                    toolName,
+                    "Verification failed and introduced a new active diagnostic: " + TruncateSingleLine(fallbackSummary, 140),
+                    _recentWrites);
             }
             return;
         }
 
         _activeDiagnostics.Clear();
         _activeDiagnostics.AddRange(diagnostics.Take(3));
+        RecordSemanticSummary(
+            "verification_failed",
+            toolName,
+            "Verification failed with " + _activeDiagnostics[0].ToSummary(),
+            _activeDiagnostics.Select(diagnostic => diagnostic.FilePath).Where(path => !string.IsNullOrWhiteSpace(path)));
     }
 
     private void UpdateNextFocus(string toolName, ToolResult result)
@@ -454,6 +573,113 @@ internal sealed class CodeTaskWorkingSetService
         return collapsed[..maxLength].TrimEnd() + "...";
     }
 
+    private void RestoreSnapshot(CodeWorkingSetSnapshot? snapshot)
+    {
+        if (snapshot == null)
+            return;
+
+        foreach (var directory in snapshot.CreatedDirectories)
+            AddRecentUnique(_createdDirectories, directory, MaxListItems);
+        foreach (var file in snapshot.RecentReads)
+            AddRecentUnique(_recentReads, file, MaxListItems);
+        foreach (var file in snapshot.RecentWrites)
+            AddRecentUnique(_recentWrites, file, MaxListItems);
+
+        _activeDiagnostics.Clear();
+        _activeDiagnostics.AddRange(snapshot.ActiveDiagnostics.Select(diagnostic =>
+            new CodeDiagnostic(
+                diagnostic.ToolName,
+                diagnostic.FilePath,
+                diagnostic.LineNumber,
+                diagnostic.Code,
+                diagnostic.Message)));
+
+        _environmentSummary = CollapseWhitespace(snapshot.EnvironmentSummary);
+        _nextFocus = CollapseWhitespace(snapshot.NextFocus);
+        _lastMutationSummary = CollapseWhitespace(snapshot.LastMutationSummary);
+        _latestSemanticSummary = CloneSemanticSummary(snapshot.LatestSemanticSummary);
+    }
+
+    private CodeWorkingSetSnapshot BuildSnapshotCore()
+    {
+        return new CodeWorkingSetSnapshot
+        {
+            Goal = _goal,
+            WorkFolder = _workFolder,
+            ScaffoldProfileLabel = _scaffoldProfileLabel,
+            StartedFromEmptyWorkspace = _startedFromEmptyWorkspace,
+            CreatedDirectories = _createdDirectories.ToList(),
+            RecentReads = _recentReads.ToList(),
+            RecentWrites = _recentWrites.ToList(),
+            ActiveDiagnostics = _activeDiagnostics.Select(diagnostic => new CodeWorkingSetDiagnosticSnapshot
+            {
+                ToolName = diagnostic.ToolName,
+                FilePath = diagnostic.FilePath,
+                LineNumber = diagnostic.LineNumber,
+                Code = diagnostic.Code,
+                Message = diagnostic.Message,
+            }).ToList(),
+            EnvironmentSummary = _environmentSummary,
+            NextFocus = _nextFocus,
+            LastMutationSummary = _lastMutationSummary,
+            LatestSemanticSummary = CloneSemanticSummary(_latestSemanticSummary),
+            UpdatedAt = DateTime.Now,
+        };
+    }
+
+    private static string CreateSnapshotFingerprint(CodeWorkingSetSnapshot snapshot)
+    {
+        return JsonSerializer.Serialize(snapshot);
+    }
+
+    private void RecordSemanticSummary(string kind, string toolName, string summary, IEnumerable<string>? paths)
+    {
+        var normalizedSummary = TruncateSingleLine(summary, 220);
+        if (string.IsNullOrWhiteSpace(normalizedSummary))
+            return;
+
+        _latestSemanticSummary = new CodeWorkingSetSemanticSummary
+        {
+            Kind = kind,
+            ToolName = toolName,
+            Summary = normalizedSummary,
+            Paths = paths?
+                .Where(path => !string.IsNullOrWhiteSpace(path))
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .Take(4)
+                .ToList()
+                ?? new List<string>(),
+            UpdatedAt = DateTime.Now,
+        };
+    }
+
+    private static CodeWorkingSetDiagnosticSnapshot CloneDiagnosticSnapshot(CodeWorkingSetDiagnosticSnapshot snapshot)
+    {
+        return new CodeWorkingSetDiagnosticSnapshot
+        {
+            ToolName = snapshot.ToolName,
+            FilePath = snapshot.FilePath,
+            LineNumber = snapshot.LineNumber,
+            Code = snapshot.Code,
+            Message = snapshot.Message,
+        };
+    }
+
+    private static CodeWorkingSetSemanticSummary? CloneSemanticSummary(CodeWorkingSetSemanticSummary? summary)
+    {
+        if (summary == null)
+            return null;
+
+        return new CodeWorkingSetSemanticSummary
+        {
+            Kind = summary.Kind,
+            ToolName = summary.ToolName,
+            Summary = summary.Summary,
+            Paths = summary.Paths.ToList(),
+            UpdatedAt = summary.UpdatedAt,
+        };
+    }
+
     private sealed record CodeDiagnostic(
         string ToolName,
         string FilePath,

src/AxCopilot/Services/Agent/ContextCondenser.cs

@@ -15,7 +15,7 @@ public sealed class ContextCompactionResult
     public int CollapsedBoundaryCount { get; set; }
     public List<string> AppliedStages { get; } = new();
     public int SavedTokens => Math.Max(0, BeforeTokens - AfterTokens);
-    public string StageSummary => AppliedStages.Count == 0 ? "없음" : string.Join(" -> ", AppliedStages);
+    public string StageSummary => AppliedStages.Count == 0 ? "none" : string.Join(" -> ", AppliedStages);
 }
 
 /// <summary>
@@ -43,7 +43,7 @@ public static class ContextCondenser
     private const int RecentKeepCount = 12;
     private const int AutoCompactBufferTokens = 13_000;
     private const int SummaryReserveTokens = 20_000;
-    private const string TimeBasedClearedToolResultMessage = "[time-based microcompact] 이전 tool_result 내용이 정리되었습니다.";
+    private const string TimeBasedClearedToolResultMessage = "[time-based microcompact] Previous tool_result content was cleared.";
 
     private readonly record struct TimeBasedToolResultCompactionConfig(bool Enabled, int GapThresholdMinutes, int KeepRecentToolResults);
 
@@ -237,7 +237,7 @@ public static class ContextCondenser
         if (didCompress)
         {
             var afterTokens = TokenEstimator.EstimateMessages(messages);
-            LogService.Info($"Context Condenser: {originalTokens} → {afterTokens} 토큰 (절감 {originalTokens - afterTokens})");
+            LogService.Info($"Context Condenser: {originalTokens} -> {afterTokens} tokens (saved {originalTokens - afterTokens})");
             result.Changed = true;
             result.AfterTokens = afterTokens;
         }
@@ -366,7 +366,7 @@ public static class ContextCondenser
             {
                 if (msg.Content.Length > MaxToolResultChars * 3)
                 {
-                    messages[i] = CloneWithContent(msg, msg.Content[..(MaxToolResultChars * 2)] + "...[축약됨]\"]}");
+                    messages[i] = CloneWithContent(msg, msg.Content[..(MaxToolResultChars * 2)] + "...[truncated]\"]}");
                     truncated = true;
                 }
             }
@@ -374,8 +374,8 @@ public static class ContextCondenser
             {
                 messages[i] = CloneWithContent(
                     msg,
-                    msg.Content[..MaxToolResultChars] + "\n\n...[이전 내용 축약됨 — 원본 " +
+                    msg.Content[..MaxToolResultChars] + "\n\n...[previous content truncated - kept " +
-                    $"{msg.Content.Length:N0}자 중 {MaxToolResultChars:N0}자 유지]");
+                    $"{MaxToolResultChars:N0} of {msg.Content.Length:N0} chars]");
                 truncated = true;
             }
         }
@@ -387,13 +387,18 @@ public static class ContextCondenser
     {
         return new ChatMessage
         {
+            MsgId = source.MsgId,
             Role = source.Role,
             Content = content,
             Timestamp = source.Timestamp,
             MetaKind = source.MetaKind,
             MetaRunId = source.MetaRunId,
             Feedback = source.Feedback,
+            ResponseElapsedMs = source.ResponseElapsedMs,
+            PromptTokens = source.PromptTokens,
+            CompletionTokens = source.CompletionTokens,
             AttachedFiles = source.AttachedFiles?.ToList(),
+            QueryPreviewContent = source.QueryPreviewContent,
             Images = source.Images?.Select(x => new ImageAttachment
             {
                 Base64 = x.Base64,
@@ -508,9 +513,9 @@ public static class ContextCondenser
             AttachedFiles = attachedFiles.Count > 0 ? attachedFiles : null,
             Content = string.Join("\n", new[]
             {
-                $"[세션 메모리 압축 - {candidates.Count}개 이전 경계 통합]",
+                $"[session memory compaction - merged {candidates.Count} earlier boundaries]",
-                "- 이전 요약, 실행 경계, 오래된 메타 로그를 하나의 세션 메모로 합쳤습니다.",
+                "- Earlier summaries, execution boundaries, and stale meta logs were merged into one session memory block.",
-                attachedFiles.Count > 0 ? $"- 관련 파일: {string.Join(", ", attachedFiles)}" : "- 관련 파일: 없음",
+                attachedFiles.Count > 0 ? $"- Related files: {string.Join(", ", attachedFiles)}" : "- Related files: none",
             })
         };
 
@@ -545,6 +550,11 @@ public static class ContextCondenser
 
         return string.Equals(message.MetaKind, "microcompact_boundary", StringComparison.OrdinalIgnoreCase)
                || string.Equals(message.MetaKind, "session_memory_compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous conversation summary", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous execution bundle compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous tool result compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous tool call bundle compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous execution meta compaction", StringComparison.OrdinalIgnoreCase)
                || content.StartsWith("[이전 대화 요약", StringComparison.Ordinal)
                || content.StartsWith("[이전 실행 묶음 압축", StringComparison.Ordinal)
                || content.StartsWith("[이전 도구 결과 축약", StringComparison.Ordinal)
@@ -584,7 +594,7 @@ public static class ContextCondenser
                         Timestamp = group.Last().Timestamp,
                         MetaKind = "collapsed_boundary",
                         MetaRunId = group.Last().MetaRunId,
-                        Content = $"[이전 압축 경계 병합 - {group.Count}개]\n- 이전 compact/snippet 경계를 하나로 합쳤습니다."
+                        Content = $"[previous compaction boundary merge - {group.Count} boundaries]\n- Earlier compact/snippet boundaries were merged into one marker."
                     });
                     collapsedCount += group.Count;
                     i = j;
@@ -619,6 +629,9 @@ public static class ContextCondenser
         var content = message.Content ?? "";
         return string.Equals(message.MetaKind, "microcompact_boundary", StringComparison.OrdinalIgnoreCase)
                || string.Equals(message.MetaKind, "session_memory_compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous execution bundle compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[session memory compaction", StringComparison.OrdinalIgnoreCase)
+               || content.StartsWith("[previous compaction boundary merge", StringComparison.OrdinalIgnoreCase)
                || content.StartsWith("[이전 실행 묶음 압축", StringComparison.Ordinal)
                || content.StartsWith("[세션 메모리 압축", StringComparison.Ordinal)
                || content.StartsWith("[이전 압축 경계 병합", StringComparison.Ordinal);
@@ -646,7 +659,7 @@ public static class ContextCondenser
             snipped = CloneWithContent(
                 source,
                 string.Join("\n", headLines) +
-                "\n...[snip: 중간 실행 로그/출력 축약]...\n" +
+                "\n...[snip: middle execution log/output removed]...\n" +
                 string.Join("\n", tailLines));
             return true;
         }
@@ -655,7 +668,7 @@ public static class ContextCondenser
         var tail = normalized.Length > SnipKeepTailChars ? normalized[^SnipKeepTailChars..] : "";
         snipped = CloneWithContent(
             source,
-            head + "\n...[snip: 중간 내용 축약]...\n" + tail);
+            head + "\n...[snip: middle content removed]...\n" + tail);
         return true;
     }
 
@@ -685,7 +698,7 @@ public static class ContextCondenser
         {
             compacted = CloneWithContent(
                 source,
-                $"[이전 도구 결과 축약]\n- 상세 출력은 압축되었습니다.\n- 원본 길이: {content.Length:N0}자");
+                $"[previous tool result compaction]\n- Detailed output was compacted.\n- Original length: {content.Length:N0} chars");
             return true;
         }
 
@@ -693,7 +706,7 @@ public static class ContextCondenser
         {
             compacted = CloneWithContent(
                 source,
-                $"[이전 도구 호출 묶음 축약]\n- 도구 호출 구조는 유지하지 않고 요약만 남겼습니다.\n- 원본 길이: {content.Length:N0}자");
+                $"[previous tool call bundle compaction]\n- The detailed tool call structure was compacted into a short marker.\n- Original length: {content.Length:N0} chars");
             return true;
         }
 
@@ -701,7 +714,7 @@ public static class ContextCondenser
         {
             compacted = CloneWithContent(
                 source,
-                $"[이전 실행 메타 축약]\n- 종류: {source.MetaKind}\n- 자세한 실행 이벤트는 압축되었습니다.");
+                $"[previous execution meta compaction]\n- Kind: {source.MetaKind}\n- Detailed execution events were compacted.");
             return true;
         }
 
@@ -710,7 +723,7 @@ public static class ContextCondenser
         var head = content[..Math.Min(MicrocompactSingleKeepChars, content.Length)];
         compacted = CloneWithContent(
             source,
-            head + $"\n\n...[이전 메시지 microcompact 적용 — 원본 {content.Length:N0}자]");
+            head + $"\n\n...[previous message microcompact applied - original {content.Length:N0} chars]");
         return true;
     }
 
@@ -728,15 +741,15 @@ public static class ContextCondenser
 
         var lines = new List<string>
         {
-            $"[이전 실행 묶음 압축 — {group.Count}개 메시지]"
+            $"[previous execution bundle compaction - {group.Count} messages]"
         };
 
-        if (toolResults > 0) lines.Add($"- 도구 결과 {toolResults}건 정리");
+        if (toolResults > 0) lines.Add($"- Compacted tool results: {toolResults}");
-        if (toolCalls > 0) lines.Add($"- 도구 호출 {toolCalls}건 정리");
+        if (toolCalls > 0) lines.Add($"- Compacted tool calls: {toolCalls}");
-        if (metaEvents > 0) lines.Add($"- 실행 메타/로그 {metaEvents}건 정리");
+        if (metaEvents > 0) lines.Add($"- Compacted execution meta/logs: {metaEvents}");
-        if (longTexts > 0) lines.Add($"- 긴 설명/출력 {longTexts}건 축약");
+        if (longTexts > 0) lines.Add($"- Compacted long explanation/output blocks: {longTexts}");
-        if (attachmentSummary.AttachedFiles.Count > 0) lines.Add($"- 관련 파일: {string.Join(", ", attachmentSummary.AttachedFiles)}");
+        if (attachmentSummary.AttachedFiles.Count > 0) lines.Add($"- Related files: {string.Join(", ", attachmentSummary.AttachedFiles)}");
-        if (attachmentSummary.ImageCount > 0) lines.Add($"- 관련 이미지: {attachmentSummary.ImageCount}개");
+        if (attachmentSummary.ImageCount > 0) lines.Add($"- Related images: {attachmentSummary.ImageCount}");
 
         return new ChatMessage
         {
@@ -766,18 +779,18 @@ public static class ContextCondenser
 
         // 요약 대상 텍스트 구성
         var sb = new System.Text.StringBuilder();
-        sb.AppendLine("다음 대화 기록을 간결하게 요약하세요.");
+        sb.AppendLine("Summarize the following conversation history.");
-        sb.AppendLine("반드시 유지할 정보: 사용자 요청, 핵심 결정 사항, 생성/수정된 파일 경로, 작업 진행 상황, 중요한 결과.");
+        sb.AppendLine("Preserve the user request, key decisions, created or modified file paths, current progress, and important outcomes.");
-        sb.AppendLine("제거할 정보: 도구 실행의 상세 출력, 반복되는 내용, 중간 사고 과정.");
+        sb.AppendLine("Remove detailed tool output, repetition, and intermediate reasoning.");
-        sb.AppendLine("요약은 대화와 동일한 언어로 작성하세요. 글머리 기호(-)로 핵심 사항만 나열하세요.\n---");
+        sb.AppendLine("Write concise bullet points using the same language as the conversation.\n---");
 
         foreach (var m in oldMessages)
         {
             var content = m.Content ?? "";
             if (content.StartsWith("{\"_tool_use_blocks\""))
-                content = "[도구 호출]";
+                content = "[tool call]";
             else if (content.StartsWith("{\"type\":\"tool_result\""))
-                content = "[도구 결과]";
+                content = "[tool result]";
             else if (content.Length > 300)
                 content = content[..300] + "...";
 
@@ -808,7 +821,7 @@ public static class ContextCondenser
             messages.Add(new ChatMessage
             {
                 Role = "assistant",
-                Content = "이전 대화 내용을 확인했습니다. 이어서 작업하겠습니다.",
+                Content = "I reviewed the previous conversation summary and will continue from it.",
                 Timestamp = DateTime.Now,
             });
 
@@ -817,7 +830,7 @@ public static class ContextCondenser
         }
         catch (Exception ex)
         {
-            LogService.Warn($"Context Condenser 요약 실패: {ex.Message}");
+            LogService.Warn($"Context Condenser summary failed: {ex.Message}");
             return false;
         }
     }
@@ -848,14 +861,14 @@ public static class ContextCondenser
     {
         var lines = new List<string>
         {
-            $"[이전 대화 요약 — {oldMessageCount}개 메시지 압축]",
+            $"[previous conversation summary - {oldMessageCount} messages compacted]",
             summary.Trim()
         };
 
         if (attachmentSummary.AttachedFiles.Count > 0)
-            lines.Add($"참고 파일: {string.Join(", ", attachmentSummary.AttachedFiles)}");
+            lines.Add($"Reference files: {string.Join(", ", attachmentSummary.AttachedFiles)}");
         if (attachmentSummary.ImageCount > 0)
-            lines.Add($"참고 이미지: {attachmentSummary.ImageCount}개");
+            lines.Add($"Reference images: {attachmentSummary.ImageCount}");
 
         return string.Join("\n", lines.Where(x => !string.IsNullOrWhiteSpace(x)));
     }

src/AxCopilot/Services/ChatSessionStateService.cs

@@ -257,6 +257,7 @@ public sealed class ChatSessionStateService
             Category = source.Category,
             WorkFolder = source.WorkFolder,
             SystemCommand = source.SystemCommand,
+            CodeWorkingSet = AxCopilot.Services.Agent.CodeTaskWorkingSetService.CloneSnapshot(source.CodeWorkingSet),
             ParentId = source.Id,
             BranchLabel = branchLabel,
             BranchAtIndex = atIndex,
@@ -281,12 +282,16 @@ public sealed class ChatSessionStateService
             var m = source.Messages[i];
             fork.Messages.Add(new ChatMessage
             {
+                MsgId = m.MsgId,
                 Role = m.Role,
                 Content = m.Content,
                 Timestamp = m.Timestamp,
                 MetaKind = m.MetaKind,
                 MetaRunId = m.MetaRunId,
                 Feedback = m.Feedback,
+                ResponseElapsedMs = m.ResponseElapsedMs,
+                PromptTokens = m.PromptTokens,
+                CompletionTokens = m.CompletionTokens,
                 AttachedFiles = m.AttachedFiles?.ToList(),
                 QueryPreviewContent = m.QueryPreviewContent,
                 Images = m.Images?.Select(img => new ImageAttachment

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -6280,6 +6280,20 @@ public partial class ChatWindow : Window
         {
             loop.ActiveTab = runTab;
             loop.RuntimeWorkFolderOverride = conversation.WorkFolder;
+            loop.InitialCodeWorkingSetSnapshot = CodeTaskWorkingSetService.CloneSnapshot(conversation.CodeWorkingSet);
+            loop.CodeWorkingSetSnapshotUpdated = snapshot =>
+            {
+                var clonedSnapshot = CodeTaskWorkingSetService.CloneSnapshot(snapshot);
+                lock (_convLock)
+                {
+                    conversation.CodeWorkingSet = clonedSnapshot;
+                    if (_currentConversation != null
+                        && string.Equals(_currentConversation.Id, conversation.Id, StringComparison.Ordinal))
+                    {
+                        _currentConversation.CodeWorkingSet = CodeTaskWorkingSetService.CloneSnapshot(clonedSnapshot);
+                    }
+                }
+            };
             // 에이전트 루프를 백그라운드 스레드에서 실행 — UI 스레드 블록 방지
             // RunAsync 내부의 _llm.SendAsync가 SynchronizationContext로 UI 스레드에
             // 복귀할 때 WPF 메시지 펌프를 독점하여 창 드래그/최소화가 안 되는 문제 해결
@@ -6328,8 +6342,15 @@ public partial class ChatWindow : Window
         finally
         {
             StoreAgentLoopMessagesSnapshot(runTab, msgList);
+            if (string.Equals(runTab, "Code", StringComparison.OrdinalIgnoreCase)
+                && conversation.CodeWorkingSet != null)
+            {
+                PersistConversationSnapshot(originTab, conversation, "코드 컨텍스트 저장 실패");
+            }
             ResetPermissionRulesForRun(runTab);
             loop.RuntimeWorkFolderOverride = null;
+            loop.InitialCodeWorkingSetSnapshot = null;
+            loop.CodeWorkingSetSnapshotUpdated = null;
             loop.EventOccurred -= agentEventHandler;
             loop.UserDecisionCallback = null;
         }