fix - subagent progress isolation, persistence, and restoration during session switching

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/CopilotLanguageServer.java

@@ -25,6 +25,7 @@
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationAgent;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationCodeCopyParams;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationCreateParams;
+import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationDestroyParams;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationMode;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationModesParams;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationTemplate;
@@ -159,6 +160,12 @@ public interface CopilotLanguageServer extends LanguageServer {
   @JsonRequest("conversation/persistence")
   CompletableFuture<ChatPersistence> persistence(NullParams param);
 
+  /**
+   * Destroy a conversation, stopping any in-progress processing.
+   */
+  @JsonRequest("conversation/destroy")
+  CompletableFuture<String> destroy(ConversationDestroyParams param);
+
   /**
    * Register agent tools to the language server.
    */

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/CopilotLanguageServerConnection.java

@@ -42,6 +42,7 @@
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationAgent;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationCodeCopyParams;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationCreateParams;
+import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationDestroyParams;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationMode;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationModesParams;
 import com.microsoft.copilot.eclipse.core.lsp.protocol.ConversationTemplate;
@@ -429,6 +430,21 @@ public CompletableFuture<ChatPersistence> persistence() {
     });
   }
 
+  /**
+   * Destroy a conversation, stopping any in-progress processing on the server.
+   */
+  public void destroyConversation(String conversationId) {
+    if (StringUtils.isBlank(conversationId)) {
+      return;
+    }
+    Function<LanguageServer, CompletableFuture<String>> fn = server -> ((CopilotLanguageServer) server)
+        .destroy(new ConversationDestroyParams(conversationId));
+    this.languageServerWrapper.execute(fn).exceptionally(ex -> {
+      CopilotCore.LOGGER.error("Failed to destroy conversation: " + conversationId, ex);
+      return null;
+    });
+  }
+
   /**
    * Used to register the tools for the language server.
    */

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/ConversationDestroyParams.java

@@ -0,0 +1,54 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+package com.microsoft.copilot.eclipse.core.lsp.protocol;
+
+import java.util.Objects;
+
+import org.apache.commons.lang3.builder.ToStringBuilder;
+
+/**
+ * Parameters for destroying a conversation.
+ */
+public class ConversationDestroyParams {
+  private String conversationId;
+
+  /**
+   * Creates a new ConversationDestroyParams.
+   */
+  public ConversationDestroyParams(String conversationId) {
+    this.conversationId = conversationId;
+  }
+
+  public String getConversationId() {
+    return conversationId;
+  }
+
+  public void setConversationId(String conversationId) {
+    this.conversationId = conversationId;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(conversationId);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null || getClass() != obj.getClass()) {
+      return false;
+    }
+    ConversationDestroyParams other = (ConversationDestroyParams) obj;
+    return Objects.equals(conversationId, other.conversationId);
+  }
+
+  @Override
+  public String toString() {
+    ToStringBuilder builder = new ToStringBuilder(this);
+    builder.append("conversationId", conversationId);
+    return builder.toString();
+  }
+}

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/persistence/ConversationDataFactory.java

@@ -212,6 +212,11 @@ public List<Turn> convertToTurns(List<AbstractTurnData> turnDataList) {
       if (turnData == null) {
         continue;
       }
+      // Skip subagent turns - they are not part of the main conversation history
+      if (turnData instanceof CopilotTurnData copilotCheck
+          && copilotCheck.getParentTurnId() != null) {
+        continue;
+      }
       if (turnData instanceof UserTurnData userTurnData) {
         String requestText = userTurnData.getMessage() != null ? userTurnData.getMessage().getText() : "";
         Either<String, List<ChatCompletionContentPart>> request = Either

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/persistence/ConversationPersistenceManager.java

@@ -286,6 +286,11 @@ private ConversationData updateConversationProgressInternal(String conversationI
     CopilotTurnData copilotTurnData = findOrCreateCopilotTurn(conversationData, progress.getTurnId());
     dataFactory.updateReplyFromProgress(copilotTurnData.getReply(), progress);
 
+    // Mark subagent turns with their parent turn ID
+    if (StringUtils.isNotBlank(progress.getParentTurnId())) {
+      copilotTurnData.setParentTurnId(progress.getParentTurnId());
+    }
+
     // Update suggested title in CopilotTurnData if present
     if (StringUtils.isNotBlank(progress.getSuggestedTitle())) {
       copilotTurnData.setSuggestedTitle(progress.getSuggestedTitle());
@@ -543,4 +548,37 @@ public CompletableFuture<Void> persistModelInfo(String conversationId, String tu
   public ConversationDataFactory getDataFactory() {
     return dataFactory;
   }
+
+  /**
+   * Sets the subagentToolCallId on a subagent's CopilotTurnData to associate it with the parent turn's run_subagent
+   * tool call. This enables precise positioning of subagent content during conversation restoration.
+   *
+   * @param conversationId the conversation ID
+   * @param subagentTurnId the subagent's turn ID
+   * @param toolCallId the run_subagent tool call ID from the parent turn
+   * @return a future that completes when the tool call ID has been set
+   */
+  public CompletableFuture<Void> setSubagentToolCallId(String conversationId, String subagentTurnId,
+      String toolCallId) {
+    if (toolCallId == null || subagentTurnId == null) {
+      return CompletableFuture.completedFuture(null);
+    }
+    return CompletableFuture.runAsync(() -> {
+      lock.writeLock().lock();
+      try {
+        ConversationData conversation = getConversationFromCacheOrLoadFromDisk(conversationId);
+        if (conversation == null) {
+          return;
+        }
+        AbstractTurnData turnData = findTurn(conversation, subagentTurnId);
+        if (turnData instanceof CopilotTurnData turn && turn.getSubagentToolCallId() == null) {
+          turn.setSubagentToolCallId(toolCallId);
+        }
+      } catch (IOException e) {
+        CopilotCore.LOGGER.error("Failed to set subagent tool call ID: " + conversationId, e);
+      } finally {
+        lock.writeLock().unlock();
+      }
+    });
+  }
 }

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/persistence/CopilotTurnData.java

@@ -19,6 +19,8 @@
 public class CopilotTurnData extends AbstractTurnData {
   private ReplyData reply;
   private String suggestedTitle;
+  private String parentTurnId;
+  private String subagentToolCallId;
 
   /**
    * Default constructor initializing default values.
@@ -43,11 +45,27 @@ public void setSuggestedTitle(String suggestedTitle) {
     this.suggestedTitle = suggestedTitle;
   }
 
+  public String getParentTurnId() {
+    return parentTurnId;
+  }
+
+  public void setParentTurnId(String parentTurnId) {
+    this.parentTurnId = parentTurnId;
+  }
+
+  public String getSubagentToolCallId() {
+    return subagentToolCallId;
+  }
+
+  public void setSubagentToolCallId(String subagentToolCallId) {
+    this.subagentToolCallId = subagentToolCallId;
+  }
+
   @Override
   public int hashCode() {
     final int prime = 31;
     int result = super.hashCode();
-    result = prime * result + Objects.hash(reply, suggestedTitle);
+    result = prime * result + Objects.hash(reply, suggestedTitle, parentTurnId, subagentToolCallId);
     return result;
   }
 
@@ -63,7 +81,9 @@ public boolean equals(Object obj) {
       return false;
     }
     CopilotTurnData other = (CopilotTurnData) obj;
-    return Objects.equals(reply, other.reply) && Objects.equals(suggestedTitle, other.suggestedTitle);
+    return Objects.equals(reply, other.reply) && Objects.equals(suggestedTitle, other.suggestedTitle)
+        && Objects.equals(parentTurnId, other.parentTurnId)
+        && Objects.equals(subagentToolCallId, other.subagentToolCallId);
   }
 
   @Override
@@ -77,6 +97,8 @@ public String toString() {
     // Include CopilotTurnData specific properties
     builder.append("reply", reply);
     builder.append("suggestedTitle", suggestedTitle);
+    builder.append("parentTurnId", parentTurnId);
+    builder.append("subagentToolCallId", subagentToolCallId);
     return builder.toString();
   }