Fix duplicate AI messages for parallel tool calls (#1463)

Signed-off-by: vishnuvv27 <vardhanvishnu520@gmail.com>

Author: VishnuVV27

agents/openai_functions_agent.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"strings"
 
 	"github.com/tmc/langchaingo/callbacks"
 	"github.com/tmc/langchaingo/chains"
@@ -270,8 +271,20 @@ func (o *OpenAIFunctionsAgent) ParseOutput(contentResp *llms.ContentResponse) (
 
 	// Check for new-style tool calls first
 	if len(choice.ToolCalls) > 0 {
-		// Handle multiple tool calls properly
 		actions := make([]schema.AgentAction, 0, len(choice.ToolCalls))
+		contentMsg := "\n"
+		if choice.Content != "" {
+			contentMsg = fmt.Sprintf("responded: %s\n", choice.Content)
+		}
+
+		// Generate a shared log for all tool calls in this choice to ensure they are grouped together
+		// in constructScratchPad.
+		var logBuilder strings.Builder
+		logBuilder.WriteString(contentMsg)
+		for _, tc := range choice.ToolCalls {
+			logBuilder.WriteString(fmt.Sprintf("Invoking: %s with %s\n", tc.FunctionCall.Name, tc.FunctionCall.Arguments))
+		}
+		sharedLog := logBuilder.String()
 
 		for _, toolCall := range choice.ToolCalls {
 			functionName := toolCall.FunctionCall.Name
@@ -292,15 +305,10 @@ func (o *OpenAIFunctionsAgent) ParseOutput(contentResp *llms.ContentResponse) (
 			// If JSON parsing failed, use the raw string as tool input
 			// This handles cases like calculator expressions
 
-			contentMsg := "\n"
-			if choice.Content != "" {
-				contentMsg = fmt.Sprintf("responded: %s\n", choice.Content)
-			}
-
 			actions = append(actions, schema.AgentAction{
 				Tool:      functionName,
 				ToolInput: toolInput,
-				Log:       fmt.Sprintf("Invoking: %s with %s %s", functionName, toolInputStr, contentMsg),
+				Log:       sharedLog,
 				ToolID:    toolCall.ID,
 			})
 		}