feat(adk): add Exit tool for loop_for_reflection (#127)

* feat(adk): add Exit tool for loop_for_reflection

* feat(adk): add break_loop event for loop_for_reflection

* feat(adk): add break_loop event for loop_for_reflection

adk/intro/workflow/loop/loop_for_reflection.go

@@ -20,11 +20,12 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"time"
 
-	"github.com/cloudwego/eino-examples/adk/common/trace"
 	"github.com/cloudwego/eino/adk"
 
 	"github.com/cloudwego/eino-examples/adk/common/prints"
+	"github.com/cloudwego/eino-examples/adk/common/trace"
 	"github.com/cloudwego/eino-examples/adk/intro/workflow/loop/subagents"
 )
 
@@ -35,7 +36,7 @@ func main() {
 	defer traceCloseFn(ctx)
 
 	a, err := adk.NewLoopAgent(ctx, &adk.LoopAgentConfig{
-		Name:          "ReflectionAgent",
+		Name:          "reflection_agent",
 		Description:   "Reflection agent with main and critique agent for iterative task solving.",
 		SubAgents:     []adk.Agent{subagents.NewMainAgent(), subagents.NewCritiqueAgent()},
 		MaxIterations: 5,
@@ -45,7 +46,7 @@ func main() {
 	}
 
 	query := "briefly introduce what a multimodal embedding model is."
-	ctx, endSpanFn := startSpanFn(ctx, "layered-supervisor", query)
+	ctx, endSpanFn := startSpanFn(ctx, "ReflectionAgents", query)
 
 	runner := adk.NewRunner(ctx, adk.RunnerConfig{
 		EnableStreaming: true, // you can disable streaming here
@@ -73,4 +74,5 @@ func main() {
 	}
 
 	endSpanFn(ctx, lastMessage)
+	time.Sleep(20 * time.Second)
 }

adk/intro/workflow/loop/subagents/chatmodel.go

@@ -21,13 +21,16 @@ import (
 	"log"
 
 	"github.com/cloudwego/eino/adk"
+	"github.com/cloudwego/eino/components/tool"
+	"github.com/cloudwego/eino/components/tool/utils"
+	"github.com/cloudwego/eino/compose"
 
 	"github.com/cloudwego/eino-examples/adk/common/model"
 )
 
 func NewMainAgent() adk.Agent {
 	a, err := adk.NewChatModelAgent(context.Background(), &adk.ChatModelAgentConfig{
-		Name:        "MainAgent",
+		Name:        "main_agent",
 		Description: "Main agent that attempts to solve the user's task.",
 		Instruction: `You are the main agent responsible for solving the user's task. 
 Provide a comprehensive solution based on the given requirements. 
@@ -41,18 +44,40 @@ Focus on delivering accurate and complete results.`,
 }
 
 func NewCritiqueAgent() adk.Agent {
+
+	exitAndSummarizeTool, err := utils.InferTool("exit_and_summarize", "exit from the loop and provide a final summary response",
+		func(ctx context.Context, req *exitAndSummarize) (string, error) {
+			_ = adk.SendToolGenAction(ctx, "exit_and_summarize", adk.NewBreakLoopAction("critique_agent"))
+			return req.Summary, nil
+		})
+	if err != nil {
+		log.Fatalf("create tool failed, name=%v, err=%v", "exit_and_summarize", err)
+	}
 	a, err := adk.NewChatModelAgent(context.Background(), &adk.ChatModelAgentConfig{
-		Name:        "CritiqueAgent",
+		Name:        "critique_agent",
 		Description: "Critique agent that reviews the main agent's work and provides feedback.",
 		Instruction: `You are a critique agent responsible for reviewing the main agent's work.
 Analyze the provided solution for accuracy, completeness, and quality.
 If you find issues or areas for improvement, provide specific feedback.
-If the work is satisfactory, call the 'exit' tool and provide a final summary response.`,
+If the work is satisfactory, call the 'exit_and_summarize' tool and provide a final summary response.`,
 		Model: model.NewChatModel(),
-		// Exit:  nil, // use default exit tool
+		ToolsConfig: adk.ToolsConfig{
+			ToolsNodeConfig: compose.ToolsNodeConfig{
+				Tools: []tool.BaseTool{
+					exitAndSummarizeTool,
+				},
+			},
+			ReturnDirectly: map[string]bool{
+				"exit_and_summarize": true,
+			},
+		},
 	})
 	if err != nil {
-		log.Fatal(err)
+		log.Fatalf("create agent failed, name=%v, err=%v", "critique_agent", err)
 	}
 	return a
 }
+
+type exitAndSummarize struct {
+	Summary string `json:"summary" jsonschema_description:"final summary of the solution"`
+}