DeepSeek V3.2 Thinking Mode Integration (#1134)

packages/core/src/services/sessionService.ts

@@ -542,6 +542,39 @@ export class SessionService {
   }
 }
 
+/**
+ * Options for building API history from conversation.
+ */
+export interface BuildApiHistoryOptions {
+  /**
+   * Whether to strip thought parts from the history.
+   * Thought parts are content parts that have `thought: true`.
+   * @default true
+   */
+  stripThoughtsFromHistory?: boolean;
+}
+
+/**
+ * Strips thought parts from a Content object.
+ * Thought parts are identified by having `thought: true`.
+ * Returns null if the content only contained thought parts.
+ */
+function stripThoughtsFromContent(content: Content): Content | null {
+  if (!content.parts) return content;
+
+  const filteredParts = content.parts.filter((part) => !(part as Part).thought);
+
+  // If all parts were thoughts, remove the entire content
+  if (filteredParts.length === 0) {
+    return null;
+  }
+
+  return {
+    ...content,
+    parts: filteredParts,
+  };
+}
+
 /**
  * Builds the model-facing chat history (Content[]) from a reconstructed
  * conversation. This keeps UI history intact while applying chat compression
@@ -555,7 +588,9 @@ export class SessionService {
  */
 export function buildApiHistoryFromConversation(
   conversation: ConversationRecord,
+  options: BuildApiHistoryOptions = {},
 ): Content[] {
+  const { stripThoughtsFromHistory = true } = options;
   const { messages } = conversation;
 
   let lastCompressionIndex = -1;
@@ -585,14 +620,26 @@ export function buildApiHistoryFromConversation(
       }
     }
 
+    if (stripThoughtsFromHistory) {
+      return baseHistory
+        .map(stripThoughtsFromContent)
+        .filter((content): content is Content => content !== null);
+    }
     return baseHistory;
   }
 
   // Fallback: return linear messages as Content[]
-  return messages
+  const result = messages
     .map((record) => record.message)
     .filter((message): message is Content => message !== undefined)
     .map((message) => structuredClone(message));
+
+  if (stripThoughtsFromHistory) {
+    return result
+      .map(stripThoughtsFromContent)
+      .filter((content): content is Content => content !== null);
+  }
+  return result;
 }
 
 /**