Show thoughts and text response in thoughts on anthropic tool use

Previously if anthropic models were using tools, the models text
response accompanying the tool use wouldn't be shown as they were
overwritten in aggregated response with the tool call json.

This changes appends the text response to the thoughts portion on tool
use to still show model's thinking. Thinking and text response are
delineated by italics vs normal text for such cases.

src/khoj/processor/conversation/anthropic/anthropic_chat.py

@@ -35,7 +35,7 @@ def anthropic_send_message_to_model(
     """
     Send message to model
     """
-    # Get Response from GPT. Don't use response_type because Anthropic doesn't support it.
+    # Get response from model. Don't use response_type because Anthropic doesn't support it.
     return anthropic_completion_with_backoff(
         messages=messages,
         system_prompt="",

src/khoj/processor/conversation/anthropic/utils.py

@@ -129,6 +129,14 @@ def anthropic_completion_with_backoff(
             if item.type == "tool_use"
         ]
         if tool_calls:
+            # If there are tool calls, aggregate thoughts and responses into thoughts
+            if thoughts and aggregated_response:
+                # wrap each line of thought in italics
+                thoughts = "\n".join([f"*{line.strip()}*" for line in thoughts.splitlines() if line.strip()])
+                thoughts = f"{thoughts}\n\n{aggregated_response}"
+            else:
+                thoughts = thoughts or aggregated_response
+            # Json dump tool calls into aggregated response
             aggregated_response = json.dumps(tool_calls)
     # If response schema is used, return the first tool call's input
     elif response_schema: