Adding the Kit interface [https://github.com/tmc/langchaingo/issues/1103]

tools/tool.go

@@ -1,10 +1,24 @@
 package tools
 
-import "context"
+import (
+	"context"
+	"fmt"
+)
 
 // Tool is a tool for the llm agent to interact with different applications.
 type Tool interface {
 	Name() string
 	Description() string
 	Call(ctx context.Context, input string) (string, error)
 }
+
+type Kit []Tool
+
+func (tb *Kit) UseTool(ctx context.Context, toolName string, toolArgs string) (string, error) {
+	for _, tool := range *tb {
+		if tool.Name() == toolName {
+			return tool.Call(ctx, toolArgs)
+		}
+	}
+	return "", fmt.Errorf("invalid tool %v", toolName)
+}

tools/tool_test.go

@@ -0,0 +1,47 @@
+package tools
+
+import (
+	"context"
+	"testing"
+)
+
+type SomeTool struct{}
+
+func (st *SomeTool) Name() string {
+	return "An awesome tool"
+}
+
+func (st *SomeTool) Description() string {
+	return "This tool is awesome"
+}
+
+func (st *SomeTool) Call(ctx context.Context, _ string) (string, error) {
+	if ctx.Err() != nil {
+		return "", ctx.Err()
+	}
+	return "test", nil
+}
+
+func TestTool(t *testing.T) {
+	t.Parallel()
+	t.Run("Tool Exists in Kit", func(t *testing.T) {
+		t.Parallel()
+		kit := Kit{
+			&SomeTool{},
+		}
+		_, err := kit.UseTool(context.Background(), "An awesome tool", "test")
+		if err != nil {
+			t.Errorf("Error using tool: %v", err)
+		}
+	})
+	t.Run("Tool Does Not Exist in Kit", func(t *testing.T) {
+		t.Parallel()
+		kit := Kit{
+			&SomeTool{},
+		}
+		_, err := kit.UseTool(context.Background(), "A tool that does not exist", "test")
+		if err == nil {
+			t.Errorf("Expected error, got nil")
+		}
+	})
+}