Merge pull request #1827 from alexhoshina/refactor/agent-loop

Refactor/agent loop

pkg/agent/eventbus_test.go

@@ -334,6 +334,9 @@ func TestAgentLoop_EmitsSteeringAndSkippedToolEvents(t *testing.T) {
 	if interruptPayload.Role != "user" {
 		t.Fatalf("expected interrupt role user, got %q", interruptPayload.Role)
 	}
+	if interruptPayload.Kind != InterruptKindSteering {
+		t.Fatalf("expected steering interrupt kind, got %q", interruptPayload.Kind)
+	}
 	if interruptPayload.ContentLen != len("change course") {
 		t.Fatalf("expected interrupt content len %d, got %d", len("change course"), interruptPayload.ContentLen)
 	}

pkg/agent/events.go

@@ -105,6 +105,8 @@ const (
 	TurnEndStatusCompleted TurnEndStatus = "completed"
 	// TurnEndStatusError indicates the turn ended because of an error.
 	TurnEndStatusError TurnEndStatus = "error"
+	// TurnEndStatusAborted indicates the turn was hard-aborted and rolled back.
+	TurnEndStatusAborted TurnEndStatus = "aborted"
 )
 
 // TurnStartPayload describes the start of a turn.
@@ -215,11 +217,21 @@ type FollowUpQueuedPayload struct {
 	ContentLen int
 }
 
-// InterruptReceivedPayload describes a queued soft interrupt.
+type InterruptKind string
+
+const (
+	InterruptKindSteering InterruptKind = "steering"
+	InterruptKindGraceful InterruptKind = "graceful"
+	InterruptKindHard     InterruptKind = "hard_abort"
+)
+
+// InterruptReceivedPayload describes accepted turn-control input.
 type InterruptReceivedPayload struct {
+	Kind       InterruptKind
 	Role       string
 	ContentLen int
 	QueueDepth int
+	HintLen    int
 }
 
 // SubTurnSpawnPayload describes the creation of a child turn.

pkg/agent/steering.go

@@ -122,20 +122,23 @@ func (al *AgentLoop) Steer(msg providers.Message) error {
 		"content_len": len(msg.Content),
 		"queue_len":   al.steering.len(),
 	})
-	agentID := ""
+
-	if registry := al.GetRegistry(); registry != nil {
+	meta := EventMeta{
+		Source:    "Steer",
+		TracePath: "turn.interrupt.received",
+	}
+	if ts := al.getActiveTurnState(); ts != nil {
+		meta = ts.eventMeta("Steer", "turn.interrupt.received")
+	} else if registry := al.GetRegistry(); registry != nil {
 		if agent := registry.GetDefaultAgent(); agent != nil {
-			agentID = agent.ID
+			meta.AgentID = agent.ID
 		}
 	}
 	al.emitEvent(
 		EventKindInterruptReceived,
-		EventMeta{
+		meta,
-			AgentID:   agentID,
-			Source:    "Steer",
-			TracePath: "turn.interrupt.received",
-		},
 		InterruptReceivedPayload{
+			Kind:       InterruptKindSteering,
 			Role:       msg.Role,
 			ContentLen: len(msg.Content),
 			QueueDepth: al.steering.len(),
@@ -177,6 +180,10 @@ func (al *AgentLoop) dequeueSteeringMessages() []providers.Message {
 //
 // If no steering messages are pending, it returns an empty string.
 func (al *AgentLoop) Continue(ctx context.Context, sessionKey, channel, chatID string) (string, error) {
+	if active := al.GetActiveTurn(); active != nil {
+		return "", fmt.Errorf("turn %s is still active", active.TurnID)
+	}
+
 	steeringMsgs := al.dequeueSteeringMessages()
 	if len(steeringMsgs) == 0 {
 		return "", nil
@@ -187,6 +194,12 @@ func (al *AgentLoop) Continue(ctx context.Context, sessionKey, channel, chatID s
 		return "", fmt.Errorf("no default agent available")
 	}
 
+	if tool, ok := agent.Tools.Get("message"); ok {
+		if resetter, ok := tool.(interface{ ResetSentInRound() }); ok {
+			resetter.ResetSentInRound()
+		}
+	}
+
 	// Build a combined user message from the steering messages.
 	var contents []string
 	for _, msg := range steeringMsgs {
@@ -205,3 +218,44 @@ func (al *AgentLoop) Continue(ctx context.Context, sessionKey, channel, chatID s
 		SkipInitialSteeringPoll: true,
 	})
 }
+
+func (al *AgentLoop) InterruptGraceful(hint string) error {
+	ts := al.getActiveTurnState()
+	if ts == nil {
+		return fmt.Errorf("no active turn")
+	}
+	if !ts.requestGracefulInterrupt(hint) {
+		return fmt.Errorf("turn %s cannot accept graceful interrupt", ts.turnID)
+	}
+
+	al.emitEvent(
+		EventKindInterruptReceived,
+		ts.eventMeta("InterruptGraceful", "turn.interrupt.received"),
+		InterruptReceivedPayload{
+			Kind:    InterruptKindGraceful,
+			HintLen: len(hint),
+		},
+	)
+
+	return nil
+}
+
+func (al *AgentLoop) InterruptHard() error {
+	ts := al.getActiveTurnState()
+	if ts == nil {
+		return fmt.Errorf("no active turn")
+	}
+	if !ts.requestHardAbort() {
+		return fmt.Errorf("turn %s is already aborting", ts.turnID)
+	}
+
+	al.emitEvent(
+		EventKindInterruptReceived,
+		ts.eventMeta("InterruptHard", "turn.interrupt.received"),
+		InterruptReceivedPayload{
+			Kind: InterruptKindHard,
+		},
+	)
+
+	return nil
+}

pkg/agent/steering_test.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"reflect"
 	"sync"
 	"testing"
 	"time"
@@ -12,6 +13,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/providers"
+	"github.com/sipeed/picoclaw/pkg/routing"
 	"github.com/sipeed/picoclaw/pkg/tools"
 )
 
@@ -396,6 +398,103 @@ func (m *toolCallProvider) GetDefaultModel() string {
 	return "tool-call-mock"
 }
 
+type gracefulCaptureProvider struct {
+	mu                 sync.Mutex
+	calls              int
+	toolCalls          []providers.ToolCall
+	finalResp          string
+	terminalMessages   []providers.Message
+	terminalToolsCount int
+}
+
+func (p *gracefulCaptureProvider) Chat(
+	ctx context.Context,
+	messages []providers.Message,
+	tools []providers.ToolDefinition,
+	model string,
+	opts map[string]any,
+) (*providers.LLMResponse, error) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.calls++
+
+	if p.calls == 1 {
+		return &providers.LLMResponse{
+			ToolCalls: p.toolCalls,
+		}, nil
+	}
+
+	p.terminalMessages = append([]providers.Message(nil), messages...)
+	p.terminalToolsCount = len(tools)
+	return &providers.LLMResponse{
+		Content: p.finalResp,
+	}, nil
+}
+
+func (p *gracefulCaptureProvider) GetDefaultModel() string {
+	return "graceful-capture-mock"
+}
+
+type lateSteeringProvider struct {
+	mu                 sync.Mutex
+	calls              int
+	firstCallStarted   chan struct{}
+	releaseFirstCall   chan struct{}
+	firstStartOnce     sync.Once
+	secondCallMessages []providers.Message
+}
+
+func (p *lateSteeringProvider) Chat(
+	ctx context.Context,
+	messages []providers.Message,
+	tools []providers.ToolDefinition,
+	model string,
+	opts map[string]any,
+) (*providers.LLMResponse, error) {
+	p.mu.Lock()
+	p.calls++
+	call := p.calls
+	p.mu.Unlock()
+
+	if call == 1 {
+		p.firstStartOnce.Do(func() { close(p.firstCallStarted) })
+		<-p.releaseFirstCall
+		return &providers.LLMResponse{Content: "first response"}, nil
+	}
+
+	p.mu.Lock()
+	p.secondCallMessages = append([]providers.Message(nil), messages...)
+	p.mu.Unlock()
+	return &providers.LLMResponse{Content: "continued response"}, nil
+}
+
+func (p *lateSteeringProvider) GetDefaultModel() string {
+	return "late-steering-mock"
+}
+
+type interruptibleTool struct {
+	name    string
+	started chan struct{}
+	once    sync.Once
+}
+
+func (t *interruptibleTool) Name() string        { return t.name }
+func (t *interruptibleTool) Description() string { return "interruptible tool for testing" }
+func (t *interruptibleTool) Parameters() map[string]any {
+	return map[string]any{
+		"type":       "object",
+		"properties": map[string]any{},
+	}
+}
+
+func (t *interruptibleTool) Execute(ctx context.Context, args map[string]any) *tools.ToolResult {
+	if t.started != nil {
+		t.once.Do(func() { close(t.started) })
+	}
+	<-ctx.Done()
+	return tools.ErrorResult(ctx.Err().Error()).WithError(ctx.Err())
+}
+
 func TestAgentLoop_Steering_SkipsRemainingTools(t *testing.T) {
 	tmpDir, err := os.MkdirTemp("", "agent-test-*")
 	if err != nil {
@@ -568,6 +667,427 @@ func TestAgentLoop_Steering_InitialPoll(t *testing.T) {
 	}
 }
 
+func TestAgentLoop_Run_AutoContinuesLateSteeringMessage(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "agent-test-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				Model:             "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	provider := &lateSteeringProvider{
+		firstCallStarted: make(chan struct{}),
+		releaseFirstCall: make(chan struct{}),
+	}
+	al := NewAgentLoop(cfg, msgBus, provider)
+
+	runCtx, cancelRun := context.WithCancel(context.Background())
+	defer cancelRun()
+
+	runErrCh := make(chan error, 1)
+	go func() {
+		runErrCh <- al.Run(runCtx)
+	}()
+
+	first := bus.InboundMessage{
+		Channel:  "test",
+		SenderID: "user1",
+		ChatID:   "chat1",
+		Content:  "first message",
+		Peer: bus.Peer{
+			Kind: "direct",
+			ID:   "user1",
+		},
+	}
+	late := bus.InboundMessage{
+		Channel:  "test",
+		SenderID: "user1",
+		ChatID:   "chat1",
+		Content:  "late append",
+		Peer: bus.Peer{
+			Kind: "direct",
+			ID:   "user1",
+		},
+	}
+
+	pubCtx, pubCancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer pubCancel()
+	if err := msgBus.PublishInbound(pubCtx, first); err != nil {
+		t.Fatalf("publish first inbound: %v", err)
+	}
+
+	select {
+	case <-provider.firstCallStarted:
+	case <-time.After(2 * time.Second):
+		t.Fatal("timeout waiting for first provider call to start")
+	}
+
+	if err := msgBus.PublishInbound(pubCtx, late); err != nil {
+		t.Fatalf("publish late inbound: %v", err)
+	}
+
+	close(provider.releaseFirstCall)
+
+	subCtx, subCancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer subCancel()
+
+	out1, ok := msgBus.SubscribeOutbound(subCtx)
+	if !ok {
+		t.Fatal("expected first outbound response")
+	}
+	if out1.Content != "first response" {
+		t.Fatalf("expected first response, got %q", out1.Content)
+	}
+
+	out2, ok := msgBus.SubscribeOutbound(subCtx)
+	if !ok {
+		t.Fatal("expected continued outbound response")
+	}
+	if out2.Content != "continued response" {
+		t.Fatalf("expected continued response, got %q", out2.Content)
+	}
+
+	cancelRun()
+	select {
+	case err := <-runErrCh:
+		if err != nil {
+			t.Fatalf("Run returned error: %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("timeout waiting for Run to stop")
+	}
+
+	provider.mu.Lock()
+	calls := provider.calls
+	secondMessages := append([]providers.Message(nil), provider.secondCallMessages...)
+	provider.mu.Unlock()
+
+	if calls != 2 {
+		t.Fatalf("expected 2 provider calls, got %d", calls)
+	}
+
+	foundLateMessage := false
+	for _, msg := range secondMessages {
+		if msg.Role == "user" && msg.Content == "late append" {
+			foundLateMessage = true
+			break
+		}
+	}
+	if !foundLateMessage {
+		t.Fatal("expected queued late message to be processed in an automatic follow-up turn")
+	}
+}
+
+func TestAgentLoop_InterruptGraceful_UsesTerminalNoToolCall(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "agent-test-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				Model:             "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+			},
+		},
+	}
+
+	tool1ExecCh := make(chan struct{})
+	tool1 := &slowTool{name: "tool_one", duration: 50 * time.Millisecond, execCh: tool1ExecCh}
+	tool2 := &slowTool{name: "tool_two", duration: 50 * time.Millisecond}
+
+	provider := &gracefulCaptureProvider{
+		toolCalls: []providers.ToolCall{
+			{
+				ID:   "call_1",
+				Type: "function",
+				Name: "tool_one",
+				Function: &providers.FunctionCall{
+					Name:      "tool_one",
+					Arguments: "{}",
+				},
+				Arguments: map[string]any{},
+			},
+			{
+				ID:   "call_2",
+				Type: "function",
+				Name: "tool_two",
+				Function: &providers.FunctionCall{
+					Name:      "tool_two",
+					Arguments: "{}",
+				},
+				Arguments: map[string]any{},
+			},
+		},
+		finalResp: "graceful summary",
+	}
+
+	msgBus := bus.NewMessageBus()
+	al := NewAgentLoop(cfg, msgBus, provider)
+	al.RegisterTool(tool1)
+	al.RegisterTool(tool2)
+	sessionKey := routing.BuildAgentMainSessionKey(routing.DefaultAgentID)
+
+	sub := al.SubscribeEvents(32)
+	defer al.UnsubscribeEvents(sub.ID)
+
+	type result struct {
+		resp string
+		err  error
+	}
+	resultCh := make(chan result, 1)
+	go func() {
+		resp, err := al.ProcessDirectWithChannel(
+			context.Background(),
+			"do something",
+			sessionKey,
+			"test",
+			"chat1",
+		)
+		resultCh <- result{resp: resp, err: err}
+	}()
+
+	select {
+	case <-tool1ExecCh:
+	case <-time.After(2 * time.Second):
+		t.Fatal("timeout waiting for tool_one to start")
+	}
+
+	active := al.GetActiveTurn()
+	if active == nil {
+		t.Fatal("expected active turn while tool is running")
+	}
+	if active.SessionKey != sessionKey {
+		t.Fatalf("expected active session %q, got %q", sessionKey, active.SessionKey)
+	}
+	if active.Channel != "test" || active.ChatID != "chat1" {
+		t.Fatalf("unexpected active turn target: %#v", active)
+	}
+
+	if err := al.InterruptGraceful("wrap it up"); err != nil {
+		t.Fatalf("InterruptGraceful failed: %v", err)
+	}
+
+	select {
+	case r := <-resultCh:
+		if r.err != nil {
+			t.Fatalf("unexpected error: %v", r.err)
+		}
+		if r.resp != "graceful summary" {
+			t.Fatalf("expected graceful summary, got %q", r.resp)
+		}
+	case <-time.After(5 * time.Second):
+		t.Fatal("timeout waiting for graceful interrupt result")
+	}
+
+	if active := al.GetActiveTurn(); active != nil {
+		t.Fatalf("expected no active turn after completion, got %#v", active)
+	}
+
+	provider.mu.Lock()
+	terminalMessages := append([]providers.Message(nil), provider.terminalMessages...)
+	terminalToolsCount := provider.terminalToolsCount
+	calls := provider.calls
+	provider.mu.Unlock()
+
+	if calls != 2 {
+		t.Fatalf("expected 2 provider calls, got %d", calls)
+	}
+	if terminalToolsCount != 0 {
+		t.Fatalf("expected graceful terminal call to disable tools, got %d tool defs", terminalToolsCount)
+	}
+
+	foundHint := false
+	foundSkipped := false
+	expectedHint := "Interrupt requested. Stop scheduling tools and provide a short final summary.\n\n" +
+		"Interrupt hint: wrap it up"
+	for _, msg := range terminalMessages {
+		if msg.Role == "user" && msg.Content == expectedHint {
+			foundHint = true
+		}
+		if msg.Role == "tool" && msg.ToolCallID == "call_2" && msg.Content == "Skipped due to graceful interrupt." {
+			foundSkipped = true
+		}
+	}
+	if !foundHint {
+		t.Fatal("expected graceful terminal call to include interrupt hint message")
+	}
+	if !foundSkipped {
+		t.Fatal("expected remaining tool to be marked as skipped after graceful interrupt")
+	}
+
+	events := collectEventStream(sub.C)
+	interruptEvt, ok := findEvent(events, EventKindInterruptReceived)
+	if !ok {
+		t.Fatal("expected interrupt received event")
+	}
+	interruptPayload, ok := interruptEvt.Payload.(InterruptReceivedPayload)
+	if !ok {
+		t.Fatalf("expected InterruptReceivedPayload, got %T", interruptEvt.Payload)
+	}
+	if interruptPayload.Kind != InterruptKindGraceful {
+		t.Fatalf("expected graceful interrupt payload, got %q", interruptPayload.Kind)
+	}
+
+	turnEndEvt, ok := findEvent(events, EventKindTurnEnd)
+	if !ok {
+		t.Fatal("expected turn end event")
+	}
+	turnEndPayload, ok := turnEndEvt.Payload.(TurnEndPayload)
+	if !ok {
+		t.Fatalf("expected TurnEndPayload, got %T", turnEndEvt.Payload)
+	}
+	if turnEndPayload.Status != TurnEndStatusCompleted {
+		t.Fatalf("expected completed turn after graceful interrupt, got %q", turnEndPayload.Status)
+	}
+}
+
+func TestAgentLoop_InterruptHard_RestoresSession(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "agent-test-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				Model:             "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	provider := &toolCallProvider{
+		toolCalls: []providers.ToolCall{
+			{
+				ID:   "call_1",
+				Type: "function",
+				Name: "cancel_tool",
+				Function: &providers.FunctionCall{
+					Name:      "cancel_tool",
+					Arguments: "{}",
+				},
+				Arguments: map[string]any{},
+			},
+		},
+		finalResp: "should not happen",
+	}
+
+	al := NewAgentLoop(cfg, msgBus, provider)
+	started := make(chan struct{})
+	al.RegisterTool(&interruptibleTool{name: "cancel_tool", started: started})
+	sessionKey := routing.BuildAgentMainSessionKey(routing.DefaultAgentID)
+
+	defaultAgent := al.registry.GetDefaultAgent()
+	if defaultAgent == nil {
+		t.Fatal("expected default agent")
+	}
+
+	originalHistory := []providers.Message{
+		{Role: "user", Content: "before"},
+		{Role: "assistant", Content: "after"},
+	}
+	defaultAgent.Sessions.SetHistory(sessionKey, originalHistory)
+
+	sub := al.SubscribeEvents(16)
+	defer al.UnsubscribeEvents(sub.ID)
+
+	type result struct {
+		resp string
+		err  error
+	}
+	resultCh := make(chan result, 1)
+	go func() {
+		resp, err := al.ProcessDirectWithChannel(
+			context.Background(),
+			"do work",
+			sessionKey,
+			"test",
+			"chat1",
+		)
+		resultCh <- result{resp: resp, err: err}
+	}()
+
+	select {
+	case <-started:
+	case <-time.After(2 * time.Second):
+		t.Fatal("timeout waiting for interruptible tool to start")
+	}
+
+	if active := al.GetActiveTurn(); active == nil {
+		t.Fatal("expected active turn before hard abort")
+	}
+
+	if err := al.InterruptHard(); err != nil {
+		t.Fatalf("InterruptHard failed: %v", err)
+	}
+
+	select {
+	case r := <-resultCh:
+		if r.err != nil {
+			t.Fatalf("unexpected error: %v", r.err)
+		}
+		if r.resp != "" {
+			t.Fatalf("expected no final response after hard abort, got %q", r.resp)
+		}
+	case <-time.After(5 * time.Second):
+		t.Fatal("timeout waiting for hard abort result")
+	}
+
+	if active := al.GetActiveTurn(); active != nil {
+		t.Fatalf("expected no active turn after hard abort, got %#v", active)
+	}
+
+	finalHistory := defaultAgent.Sessions.GetHistory(sessionKey)
+	if !reflect.DeepEqual(finalHistory, originalHistory) {
+		t.Fatalf("expected history rollback after hard abort, got %#v", finalHistory)
+	}
+
+	events := collectEventStream(sub.C)
+	interruptEvt, ok := findEvent(events, EventKindInterruptReceived)
+	if !ok {
+		t.Fatal("expected interrupt received event")
+	}
+	interruptPayload, ok := interruptEvt.Payload.(InterruptReceivedPayload)
+	if !ok {
+		t.Fatalf("expected InterruptReceivedPayload, got %T", interruptEvt.Payload)
+	}
+	if interruptPayload.Kind != InterruptKindHard {
+		t.Fatalf("expected hard interrupt payload, got %q", interruptPayload.Kind)
+	}
+
+	turnEndEvt, ok := findEvent(events, EventKindTurnEnd)
+	if !ok {
+		t.Fatal("expected turn end event")
+	}
+	turnEndPayload, ok := turnEndEvt.Payload.(TurnEndPayload)
+	if !ok {
+		t.Fatalf("expected TurnEndPayload, got %T", turnEndEvt.Payload)
+	}
+	if turnEndPayload.Status != TurnEndStatusAborted {
+		t.Fatalf("expected aborted turn, got %q", turnEndPayload.Status)
+	}
+}
+
 // capturingMockProvider captures messages sent to Chat for inspection.
 type capturingMockProvider struct {
 	response  string

pkg/agent/turn.go

@@ -0,0 +1,308 @@
+package agent
+
+import (
+	"context"
+	"reflect"
+	"sync"
+	"time"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/providers"
+)
+
+type TurnPhase string
+
+const (
+	TurnPhaseSetup      TurnPhase = "setup"
+	TurnPhaseRunning    TurnPhase = "running"
+	TurnPhaseTools      TurnPhase = "tools"
+	TurnPhaseFinalizing TurnPhase = "finalizing"
+	TurnPhaseCompleted  TurnPhase = "completed"
+	TurnPhaseAborted    TurnPhase = "aborted"
+)
+
+type ActiveTurnInfo struct {
+	TurnID      string
+	AgentID     string
+	SessionKey  string
+	Channel     string
+	ChatID      string
+	UserMessage string
+	Phase       TurnPhase
+	Iteration   int
+	StartedAt   time.Time
+}
+
+type turnResult struct {
+	finalContent string
+	status       TurnEndStatus
+	followUps    []bus.InboundMessage
+}
+
+type turnState struct {
+	mu sync.RWMutex
+
+	agent *AgentInstance
+	opts  processOptions
+	scope turnEventScope
+
+	turnID     string
+	agentID    string
+	sessionKey string
+
+	channel     string
+	chatID      string
+	userMessage string
+	media       []string
+
+	phase        TurnPhase
+	iteration    int
+	startedAt    time.Time
+	finalContent string
+
+	followUps []bus.InboundMessage
+
+	gracefulInterrupt     bool
+	gracefulInterruptHint string
+	gracefulTerminalUsed  bool
+	hardAbort             bool
+	providerCancel        context.CancelFunc
+	turnCancel            context.CancelFunc
+
+	restorePointHistory []providers.Message
+	restorePointSummary string
+	persistedMessages   []providers.Message
+}
+
+func newTurnState(agent *AgentInstance, opts processOptions, scope turnEventScope) *turnState {
+	return &turnState{
+		agent:       agent,
+		opts:        opts,
+		scope:       scope,
+		turnID:      scope.turnID,
+		agentID:     agent.ID,
+		sessionKey:  opts.SessionKey,
+		channel:     opts.Channel,
+		chatID:      opts.ChatID,
+		userMessage: opts.UserMessage,
+		media:       append([]string(nil), opts.Media...),
+		phase:       TurnPhaseSetup,
+		startedAt:   time.Now(),
+	}
+}
+
+func (al *AgentLoop) registerActiveTurn(ts *turnState) {
+	al.activeTurnMu.Lock()
+	defer al.activeTurnMu.Unlock()
+	al.activeTurn = ts
+}
+
+func (al *AgentLoop) clearActiveTurn(ts *turnState) {
+	al.activeTurnMu.Lock()
+	defer al.activeTurnMu.Unlock()
+	if al.activeTurn == ts {
+		al.activeTurn = nil
+	}
+}
+
+func (al *AgentLoop) getActiveTurnState() *turnState {
+	al.activeTurnMu.RLock()
+	defer al.activeTurnMu.RUnlock()
+	return al.activeTurn
+}
+
+func (al *AgentLoop) GetActiveTurn() *ActiveTurnInfo {
+	ts := al.getActiveTurnState()
+	if ts == nil {
+		return nil
+	}
+	info := ts.snapshot()
+	return &info
+}
+
+func (ts *turnState) snapshot() ActiveTurnInfo {
+	ts.mu.RLock()
+	defer ts.mu.RUnlock()
+
+	return ActiveTurnInfo{
+		TurnID:      ts.turnID,
+		AgentID:     ts.agentID,
+		SessionKey:  ts.sessionKey,
+		Channel:     ts.channel,
+		ChatID:      ts.chatID,
+		UserMessage: ts.userMessage,
+		Phase:       ts.phase,
+		Iteration:   ts.iteration,
+		StartedAt:   ts.startedAt,
+	}
+}
+
+func (ts *turnState) setPhase(phase TurnPhase) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.phase = phase
+}
+
+func (ts *turnState) setIteration(iteration int) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.iteration = iteration
+}
+
+func (ts *turnState) currentIteration() int {
+	ts.mu.RLock()
+	defer ts.mu.RUnlock()
+	return ts.iteration
+}
+
+func (ts *turnState) setFinalContent(content string) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.finalContent = content
+}
+
+func (ts *turnState) finalContentLen() int {
+	ts.mu.RLock()
+	defer ts.mu.RUnlock()
+	return len(ts.finalContent)
+}
+
+func (ts *turnState) setTurnCancel(cancel context.CancelFunc) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.turnCancel = cancel
+}
+
+func (ts *turnState) setProviderCancel(cancel context.CancelFunc) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.providerCancel = cancel
+}
+
+func (ts *turnState) clearProviderCancel(_ context.CancelFunc) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.providerCancel = nil
+}
+
+func (ts *turnState) requestGracefulInterrupt(hint string) bool {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	if ts.hardAbort {
+		return false
+	}
+	ts.gracefulInterrupt = true
+	ts.gracefulInterruptHint = hint
+	return true
+}
+
+func (ts *turnState) gracefulInterruptRequested() (bool, string) {
+	ts.mu.RLock()
+	defer ts.mu.RUnlock()
+	return ts.gracefulInterrupt && !ts.gracefulTerminalUsed, ts.gracefulInterruptHint
+}
+
+func (ts *turnState) markGracefulTerminalUsed() {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.gracefulTerminalUsed = true
+}
+
+func (ts *turnState) requestHardAbort() bool {
+	ts.mu.Lock()
+	if ts.hardAbort {
+		ts.mu.Unlock()
+		return false
+	}
+	ts.hardAbort = true
+	turnCancel := ts.turnCancel
+	providerCancel := ts.providerCancel
+	ts.mu.Unlock()
+
+	if providerCancel != nil {
+		providerCancel()
+	}
+	if turnCancel != nil {
+		turnCancel()
+	}
+	return true
+}
+
+func (ts *turnState) hardAbortRequested() bool {
+	ts.mu.RLock()
+	defer ts.mu.RUnlock()
+	return ts.hardAbort
+}
+
+func (ts *turnState) eventMeta(source, tracePath string) EventMeta {
+	snap := ts.snapshot()
+	return EventMeta{
+		AgentID:    snap.AgentID,
+		TurnID:     snap.TurnID,
+		SessionKey: snap.SessionKey,
+		Iteration:  snap.Iteration,
+		Source:     source,
+		TracePath:  tracePath,
+	}
+}
+
+func (ts *turnState) captureRestorePoint(history []providers.Message, summary string) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.restorePointHistory = append([]providers.Message(nil), history...)
+	ts.restorePointSummary = summary
+}
+
+func (ts *turnState) recordPersistedMessage(msg providers.Message) {
+	ts.mu.Lock()
+	defer ts.mu.Unlock()
+	ts.persistedMessages = append(ts.persistedMessages, msg)
+}
+
+func (ts *turnState) refreshRestorePointFromSession(agent *AgentInstance) {
+	history := agent.Sessions.GetHistory(ts.sessionKey)
+	summary := agent.Sessions.GetSummary(ts.sessionKey)
+
+	ts.mu.RLock()
+	persisted := append([]providers.Message(nil), ts.persistedMessages...)
+	ts.mu.RUnlock()
+
+	if matched := matchingTurnMessageTail(history, persisted); matched > 0 {
+		history = append([]providers.Message(nil), history[:len(history)-matched]...)
+	}
+
+	ts.captureRestorePoint(history, summary)
+}
+
+func (ts *turnState) restoreSession(agent *AgentInstance) error {
+	ts.mu.RLock()
+	history := append([]providers.Message(nil), ts.restorePointHistory...)
+	summary := ts.restorePointSummary
+	ts.mu.RUnlock()
+
+	agent.Sessions.SetHistory(ts.sessionKey, history)
+	agent.Sessions.SetSummary(ts.sessionKey, summary)
+	return agent.Sessions.Save(ts.sessionKey)
+}
+
+func matchingTurnMessageTail(history, persisted []providers.Message) int {
+	maxMatch := min(len(history), len(persisted))
+	for size := maxMatch; size > 0; size-- {
+		if reflect.DeepEqual(history[len(history)-size:], persisted[len(persisted)-size:]) {
+			return size
+		}
+	}
+	return 0
+}
+
+func (ts *turnState) interruptHintMessage() providers.Message {
+	_, hint := ts.gracefulInterruptRequested()
+	content := "Interrupt requested. Stop scheduling tools and provide a short final summary."
+	if hint != "" {
+		content += "\n\nInterrupt hint: " + hint
+	}
+	return providers.Message{
+		Role:    "user",
+		Content: content,
+	}
+}