feat(events): publish runtime service events

Migrate hook observation to runtime events and update the process hook notification protocol. Add runtime event publication for message bus failures, channel lifecycle/outbound flow, gateway reloads, MCP server state, and MCP tool calls.

Validation: go test ./pkg/events/... ./pkg/bus ./pkg/agent ./pkg/channels ./pkg/mcp ./pkg/tools/integration ./pkg/gateway; make lint

pkg/agent/agent_event.go

@@ -206,3 +206,11 @@ func (al *AgentLoop) RuntimeEventStats() runtimeevents.Stats {
 	}
 	return al.runtimeEvents.Stats()
 }
+
+// RuntimeEventBus returns the runtime event bus used by the agent loop.
+func (al *AgentLoop) RuntimeEventBus() runtimeevents.Bus {
+	if al == nil {
+		return nil
+	}
+	return al.runtimeEvents
+}

pkg/agent/agent_init.go

@@ -79,7 +79,7 @@ func NewAgentLoop(
 		al.ownsRuntimeEvents = true
 	}
 	al.providerFactory = providers.CreateProviderFromConfig
-	al.hooks = NewHookManager(eventBus)
+	al.hooks = NewHookManagerWithRuntimeEvents(eventBus, al.runtimeEvents.Channel())
 	configureHookManagerFromConfig(al.hooks, cfg)
 	al.contextManager = al.resolveContextManager()
 

pkg/agent/agent_mcp.go

@@ -97,7 +97,7 @@ func (al *AgentLoop) ensureMCPInitialized(ctx context.Context) error {
 	}
 
 	al.mcp.initOnce.Do(func() {
-		mcpManager := mcp.NewManager()
+		mcpManager := mcp.NewManager(mcp.WithRuntimeEvents(al.runtimeEvents))
 
 		defaultAgent := al.registry.GetDefaultAgent()
 		workspacePath := al.cfg.WorkspacePath()
@@ -164,6 +164,7 @@ func (al *AgentLoop) ensureMCPInitialized(ctx context.Context) error {
 					mcpTool := tools.NewMCPTool(mcpManager, serverName, tool)
 					mcpTool.SetWorkspace(agent.Workspace)
 					mcpTool.SetMaxInlineTextRunes(al.cfg.Tools.MCP.GetMaxInlineTextChars())
+					mcpTool.SetEventPublisher(al.runtimeEvents)
 
 					if registerAsHidden {
 						agent.Tools.RegisterHidden(mcpTool)

pkg/agent/hook_mount.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/sipeed/picoclaw/pkg/config"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 )
 
 type hookRuntime struct {
@@ -295,10 +296,11 @@ func processHookObserveKindsFromConfig(observe []string) ([]string, bool, error)
 		case "", "*", "all":
 			return nil, true, nil
 		default:
-			if _, ok := validKinds[kind]; !ok {
+			normalizedKind, ok := validKinds[kind]
+			if !ok {
 				return nil, false, fmt.Errorf("unsupported observe event %q", kind)
 			}
-			normalized = append(normalized, kind)
+			normalized = append(normalized, normalizedKind)
 		}
 	}
 
@@ -308,10 +310,15 @@ func processHookObserveKindsFromConfig(observe []string) ([]string, bool, error)
 	return normalized, true, nil
 }
 
-func validHookEventKinds() map[string]struct{} {
-	kinds := make(map[string]struct{}, int(eventKindCount))
+func validHookEventKinds() map[string]string {
+	kinds := make(map[string]string, int(eventKindCount)*2)
 	for kind := EventKind(0); kind < eventKindCount; kind++ {
-		kinds[kind.String()] = struct{}{}
+		runtimeKind := runtimeKindForAgentEvent(kind).String()
+		kinds[kind.String()] = runtimeKind
+		kinds[runtimeKind] = runtimeKind
 	}
+	kinds[runtimeevents.KindAgentToolExecStart.String()] = runtimeevents.KindAgentToolExecStart.String()
+	kinds[runtimeevents.KindAgentToolExecEnd.String()] = runtimeevents.KindAgentToolExecEnd.String()
+	kinds[runtimeevents.KindAgentToolExecSkipped.String()] = runtimeevents.KindAgentToolExecSkipped.String()
 	return kinds
 }

pkg/agent/hook_mount_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"path/filepath"
+	"slices"
 	"testing"
 
 	"github.com/sipeed/picoclaw/pkg/bus"
@@ -155,7 +156,25 @@ func TestAgentLoop_ProcessDirectWithChannel_AutoMountsProcessHook(t *testing.T)
 		t.Fatalf("expected process model, got %q", lastModel)
 	}
 
-	waitForFileContains(t, eventLog, "turn_end")
+	waitForFileContains(t, eventLog, "agent.turn.end")
+}
+
+func TestProcessHookObserveKindsFromConfigAcceptsRuntimeNames(t *testing.T) {
+	kinds, enabled, err := processHookObserveKindsFromConfig([]string{
+		"tool_exec_start",
+		"agent.tool.exec_end",
+	})
+	if err != nil {
+		t.Fatalf("processHookObserveKindsFromConfig failed: %v", err)
+	}
+	if !enabled {
+		t.Fatal("expected observe to be enabled")
+	}
+
+	want := []string{"agent.tool.exec_start", "agent.tool.exec_end"}
+	if !slices.Equal(kinds, want) {
+		t.Fatalf("observe kinds = %v, want %v", kinds, want)
+	}
 }
 
 func TestAgentLoop_ProcessDirectWithChannel_InvalidConfiguredHookFails(t *testing.T) {

pkg/agent/hook_process.go

@@ -12,6 +12,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/isolation"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/tools"
@@ -188,13 +189,26 @@ func (ph *ProcessHook) OnEvent(ctx context.Context, evt Event) error {
 		return nil
 	}
 	if len(ph.observeKinds) > 0 {
-		if _, ok := ph.observeKinds[evt.Kind.String()]; !ok {
+		kind := runtimeKindForAgentEvent(evt.Kind).String()
+		if _, ok := ph.observeKinds[kind]; !ok {
 			return nil
 		}
 	}
 	return ph.notify(ctx, "hook.event", evt)
 }
 
+func (ph *ProcessHook) OnRuntimeEvent(ctx context.Context, evt runtimeevents.Event) error {
+	if ph == nil || !ph.opts.Observe {
+		return nil
+	}
+	if len(ph.observeKinds) > 0 {
+		if _, ok := ph.observeKinds[evt.Kind.String()]; !ok {
+			return nil
+		}
+	}
+	return ph.notify(ctx, "hook.runtime_event", evt)
+}
+
 func (ph *ProcessHook) BeforeLLM(
 	ctx context.Context,
 	req *LLMHookRequest,

pkg/agent/hook_process_test.go

@@ -66,7 +66,7 @@ func TestAgentLoop_MountProcessHook_LLMAndObserver(t *testing.T) {
 		t.Fatalf("expected process model, got %q", lastModel)
 	}
 
-	waitForFileContains(t, eventLog, "turn_end")
+	waitForFileContains(t, eventLog, "agent.turn.end")
 }
 
 func TestAgentLoop_MountProcessHook_ToolRewrite(t *testing.T) {
@@ -350,10 +350,12 @@ func runProcessHookHelper() error {
 		}
 
 		if msg.ID == 0 {
-			if msg.Method == "hook.event" && eventLog != "" {
+			if (msg.Method == "hook.event" || msg.Method == "hook.runtime_event") && eventLog != "" {
 				var evt map[string]any
 				if err := json.Unmarshal(msg.Params, &evt); err == nil {
-					if rawKind, ok := evt["Kind"].(float64); ok {
+					if kind, ok := evt["kind"].(string); ok {
+						_ = os.WriteFile(eventLog, []byte(kind+"\n"), 0o644)
+					} else if rawKind, ok := evt["Kind"].(float64); ok {
 						kind := EventKind(rawKind)
 						_ = os.WriteFile(eventLog, []byte(kind.String()+"\n"), 0o644)
 					}

pkg/agent/hooks.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 	"time"
 
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/tools"
@@ -75,6 +76,10 @@ type EventObserver interface {
 	OnEvent(ctx context.Context, evt Event) error
 }
 
+type RuntimeEventObserver interface {
+	OnRuntimeEvent(ctx context.Context, evt runtimeevents.Event) error
+}
+
 type LLMInterceptor interface {
 	BeforeLLM(ctx context.Context, req *LLMHookRequest) (*LLMHookRequest, HookDecision, error)
 	AfterLLM(ctx context.Context, resp *LLMHookResponse) (*LLMHookResponse, HookDecision, error)
@@ -193,6 +198,7 @@ func (r *ToolResultHookResponse) Clone() *ToolResultHookResponse {
 
 type HookManager struct {
 	eventBus           *EventBus
+	runtimeEvents      runtimeevents.EventChannel
 	observerTimeout    time.Duration
 	interceptorTimeout time.Duration
 	approvalTimeout    time.Duration
@@ -201,28 +207,56 @@ type HookManager struct {
 	hooks   map[string]HookRegistration
 	ordered []HookRegistration
 
-	sub       EventSubscription
-	done      chan struct{}
-	closeOnce sync.Once
+	sub                   EventSubscription
+	runtimeSub            runtimeevents.Subscription
+	done                  chan struct{}
+	runtimeDone           chan struct{}
+	runtimeObserveEnabled bool
+	closeOnce             sync.Once
 }
 
 func NewHookManager(eventBus *EventBus) *HookManager {
+	return NewHookManagerWithRuntimeEvents(eventBus, nil)
+}
+
+func NewHookManagerWithRuntimeEvents(eventBus *EventBus, runtimeEvents runtimeevents.EventChannel) *HookManager {
 	hm := &HookManager{
 		eventBus:           eventBus,
+		runtimeEvents:      runtimeEvents,
 		observerTimeout:    defaultHookObserverTimeout,
 		interceptorTimeout: defaultHookInterceptorTimeout,
 		approvalTimeout:    defaultHookApprovalTimeout,
 		hooks:              make(map[string]HookRegistration),
 		done:               make(chan struct{}),
+		runtimeDone:        make(chan struct{}),
 	}
 
-	if eventBus == nil {
+	if eventBus != nil {
+		hm.sub = eventBus.Subscribe(hookObserverBufferSize)
+		go hm.dispatchEvents()
+	} else {
 		close(hm.done)
-		return hm
 	}
 
-	hm.sub = eventBus.Subscribe(hookObserverBufferSize)
-	go hm.dispatchEvents()
+	if runtimeEvents != nil {
+		sub, ch, err := runtimeEvents.SubscribeChan(context.Background(), runtimeevents.SubscribeOptions{
+			Name:   "hook-manager-observer",
+			Buffer: hookObserverBufferSize,
+		})
+		if err != nil {
+			logger.WarnCF("hooks", "Failed to subscribe runtime events for hooks", map[string]any{
+				"error": err.Error(),
+			})
+			close(hm.runtimeDone)
+		} else {
+			hm.runtimeSub = sub
+			hm.runtimeObserveEnabled = true
+			go hm.dispatchRuntimeEvents(ch)
+		}
+	} else {
+		close(hm.runtimeDone)
+	}
+
 	return hm
 }
 
@@ -235,7 +269,15 @@ func (hm *HookManager) Close() {
 		if hm.eventBus != nil {
 			hm.eventBus.Unsubscribe(hm.sub.ID)
 		}
+		if hm.runtimeSub != nil {
+			if err := hm.runtimeSub.Close(); err != nil {
+				logger.WarnCF("hooks", "Failed to close runtime event hook subscription", map[string]any{
+					"error": err.Error(),
+				})
+			}
+		}
 		<-hm.done
+		<-hm.runtimeDone
 		hm.closeAllHooks()
 	})
 }
@@ -297,6 +339,11 @@ func (hm *HookManager) dispatchEvents() {
 
 	for evt := range hm.sub.C {
 		for _, reg := range hm.snapshotHooks() {
+			if hm.runtimeObserveEnabled {
+				if _, ok := reg.Hook.(RuntimeEventObserver); ok {
+					continue
+				}
+			}
 			observer, ok := reg.Hook.(EventObserver)
 			if !ok {
 				continue
@@ -306,6 +353,20 @@ func (hm *HookManager) dispatchEvents() {
 	}
 }
 
+func (hm *HookManager) dispatchRuntimeEvents(ch <-chan runtimeevents.Event) {
+	defer close(hm.runtimeDone)
+
+	for evt := range ch {
+		for _, reg := range hm.snapshotHooks() {
+			observer, ok := reg.Hook.(RuntimeEventObserver)
+			if !ok {
+				continue
+			}
+			hm.runRuntimeObserver(reg.Name, observer, evt)
+		}
+	}
+}
+
 func (hm *HookManager) BeforeLLM(ctx context.Context, req *LLMHookRequest) (*LLMHookRequest, HookDecision) {
 	if hm == nil || req == nil {
 		return req, HookDecision{Action: HookActionContinue}
@@ -608,6 +669,37 @@ func (hm *HookManager) runObserver(name string, observer EventObserver, evt Even
 	}
 }
 
+func (hm *HookManager) runRuntimeObserver(
+	name string,
+	observer RuntimeEventObserver,
+	evt runtimeevents.Event,
+) {
+	ctx, cancel := context.WithTimeout(context.Background(), hm.observerTimeout)
+	defer cancel()
+
+	done := make(chan error, 1)
+	go func() {
+		done <- observer.OnRuntimeEvent(ctx, evt)
+	}()
+
+	select {
+	case err := <-done:
+		if err != nil {
+			logger.WarnCF("hooks", "Runtime event observer failed", map[string]any{
+				"hook":  name,
+				"event": evt.Kind.String(),
+				"error": err.Error(),
+			})
+		}
+	case <-ctx.Done():
+		logger.WarnCF("hooks", "Runtime event observer timed out", map[string]any{
+			"hook":       name,
+			"event":      evt.Kind.String(),
+			"timeout_ms": hm.observerTimeout.Milliseconds(),
+		})
+	}
+}
+
 func (hm *HookManager) callBeforeLLM(
 	parent context.Context,
 	name string,

pkg/agent/hooks_test.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/config"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/routing"
 	"github.com/sipeed/picoclaw/pkg/session"
@@ -150,6 +151,31 @@ func (h *llmObserverHook) AfterLLM(
 	return next, HookDecision{Action: HookActionModify}, nil
 }
 
+type dualRuntimeObserverHook struct {
+	legacyCh  chan Event
+	runtimeCh chan runtimeevents.Event
+}
+
+func (h *dualRuntimeObserverHook) OnEvent(ctx context.Context, evt Event) error {
+	if evt.Kind == EventKindTurnEnd {
+		select {
+		case h.legacyCh <- evt:
+		default:
+		}
+	}
+	return nil
+}
+
+func (h *dualRuntimeObserverHook) OnRuntimeEvent(ctx context.Context, evt runtimeevents.Event) error {
+	if evt.Kind == runtimeevents.KindAgentTurnEnd {
+		select {
+		case h.runtimeCh <- evt:
+		default:
+		}
+	}
+	return nil
+}
+
 type llmSystemRewriteHook struct{}
 
 func (h *llmSystemRewriteHook) BeforeLLM(
@@ -498,6 +524,65 @@ func TestAgentLoop_Hooks_ObserverAndLLMInterceptor(t *testing.T) {
 	}
 }
 
+func TestAgentLoop_Hooks_RuntimeObserverPreferredOverLegacyObserver(t *testing.T) {
+	provider := &llmHookTestProvider{}
+	al, agent, cleanup := newHookTestLoop(t, provider)
+	defer cleanup()
+
+	hook := &dualRuntimeObserverHook{
+		legacyCh:  make(chan Event, 1),
+		runtimeCh: make(chan runtimeevents.Event, 1),
+	}
+	if err := al.MountHook(NamedHook("runtime-observer", hook)); err != nil {
+		t.Fatalf("MountHook failed: %v", err)
+	}
+
+	resp, err := al.runAgentLoop(context.Background(), agent, processOptions{
+		SessionKey:      "session-1",
+		Channel:         "cli",
+		ChatID:          "direct",
+		UserMessage:     "hello",
+		DefaultResponse: defaultResponse,
+		EnableSummary:   false,
+		SendResponse:    false,
+		InboundContext: &bus.InboundContext{
+			Channel:   "cli",
+			Account:   "default",
+			ChatID:    "direct",
+			ChatType:  "direct",
+			SenderID:  "hook-user",
+			MessageID: "msg-1",
+		},
+	})
+	if err != nil {
+		t.Fatalf("runAgentLoop failed: %v", err)
+	}
+	if resp != "provider content" {
+		t.Fatalf("expected provider content, got %q", resp)
+	}
+
+	select {
+	case evt := <-hook.runtimeCh:
+		if evt.Kind != runtimeevents.KindAgentTurnEnd {
+			t.Fatalf("runtime observer kind = %q", evt.Kind)
+		}
+		if evt.Scope.SessionKey != "session-1" ||
+			evt.Scope.Channel != "cli" ||
+			evt.Scope.ChatID != "direct" ||
+			evt.Scope.MessageID != "msg-1" {
+			t.Fatalf("runtime observer scope = %+v", evt.Scope)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("timed out waiting for runtime observer event")
+	}
+
+	select {
+	case evt := <-hook.legacyCh:
+		t.Fatalf("legacy observer unexpectedly received %v", evt.Kind)
+	case <-time.After(100 * time.Millisecond):
+	}
+}
+
 func TestAgentLoop_BtwCommand_UsesLLMHooks(t *testing.T) {
 	provider := &llmHookTestProvider{}
 	al, agent, cleanup := newHookTestLoop(t, provider)

pkg/bus/bus.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/logger"
 )
 
@@ -48,6 +49,12 @@ type MessageBus struct {
 	closed         atomic.Bool
 	wg             sync.WaitGroup
 	streamDelegate atomic.Value // stores StreamDelegate
+	eventPublisher atomic.Value // stores EventPublisher
+}
+
+// EventPublisher is the minimal runtime event publisher used by MessageBus.
+type EventPublisher interface {
+	Publish(ctx context.Context, evt runtimeevents.Event) runtimeevents.PublishResult
 }
 
 func NewMessageBus() *MessageBus {
@@ -92,9 +99,14 @@ func publish[T any](ctx context.Context, mb *MessageBus, ch chan T, msg T) error
 func (mb *MessageBus) PublishInbound(ctx context.Context, msg InboundMessage) error {
 	msg = NormalizeInboundMessage(msg)
 	if msg.Context.isZero() {
+		mb.publishFailure("inbound", runtimeScopeFromInboundContext(msg.Context), ErrMissingInboundContext)
 		return ErrMissingInboundContext
 	}
-	return publish(ctx, mb, mb.inbound, msg)
+	if err := publish(ctx, mb, mb.inbound, msg); err != nil {
+		mb.publishFailure("inbound", runtimeScopeFromInboundContext(msg.Context), err)
+		return err
+	}
+	return nil
 }
 
 func (mb *MessageBus) InboundChan() <-chan InboundMessage {
@@ -104,9 +116,14 @@ func (mb *MessageBus) InboundChan() <-chan InboundMessage {
 func (mb *MessageBus) PublishOutbound(ctx context.Context, msg OutboundMessage) error {
 	msg = NormalizeOutboundMessage(msg)
 	if msg.Context.isZero() {
+		mb.publishFailure("outbound", runtimeScopeFromInboundContext(msg.Context), ErrMissingOutboundContext)
 		return ErrMissingOutboundContext
 	}
-	return publish(ctx, mb, mb.outbound, msg)
+	if err := publish(ctx, mb, mb.outbound, msg); err != nil {
+		mb.publishFailure("outbound", runtimeScopeFromInboundContext(msg.Context), err)
+		return err
+	}
+	return nil
 }
 
 func (mb *MessageBus) OutboundChan() <-chan OutboundMessage {
@@ -116,9 +133,14 @@ func (mb *MessageBus) OutboundChan() <-chan OutboundMessage {
 func (mb *MessageBus) PublishOutboundMedia(ctx context.Context, msg OutboundMediaMessage) error {
 	msg = NormalizeOutboundMediaMessage(msg)
 	if msg.Context.isZero() {
+		mb.publishFailure("outbound_media", runtimeScopeFromInboundContext(msg.Context), ErrMissingOutboundMediaContext)
 		return ErrMissingOutboundMediaContext
 	}
-	return publish(ctx, mb, mb.outboundMedia, msg)
+	if err := publish(ctx, mb, mb.outboundMedia, msg); err != nil {
+		mb.publishFailure("outbound_media", runtimeScopeFromInboundContext(msg.Context), err)
+		return err
+	}
+	return nil
 }
 
 func (mb *MessageBus) OutboundMediaChan() <-chan OutboundMediaMessage {
@@ -126,7 +148,11 @@ func (mb *MessageBus) OutboundMediaChan() <-chan OutboundMediaMessage {
 }
 
 func (mb *MessageBus) PublishAudioChunk(ctx context.Context, chunk AudioChunk) error {
-	return publish(ctx, mb, mb.audioChunks, chunk)
+	if err := publish(ctx, mb, mb.audioChunks, chunk); err != nil {
+		mb.publishFailure("audio_chunk", runtimeScopeFromAudioChunk(chunk), err)
+		return err
+	}
+	return nil
 }
 
 func (mb *MessageBus) AudioChunksChan() <-chan AudioChunk {
@@ -134,7 +160,11 @@ func (mb *MessageBus) AudioChunksChan() <-chan AudioChunk {
 }
 
 func (mb *MessageBus) PublishVoiceControl(ctx context.Context, ctrl VoiceControl) error {
-	return publish(ctx, mb, mb.voiceControls, ctrl)
+	if err := publish(ctx, mb, mb.voiceControls, ctrl); err != nil {
+		mb.publishFailure("voice_control", runtimeScopeFromVoiceControl(ctrl), err)
+		return err
+	}
+	return nil
 }
 
 func (mb *MessageBus) VoiceControlsChan() <-chan VoiceControl {
@@ -146,6 +176,11 @@ func (mb *MessageBus) SetStreamDelegate(d StreamDelegate) {
 	mb.streamDelegate.Store(d)
 }
 
+// SetEventPublisher registers a runtime event publisher for bus errors and lifecycle events.
+func (mb *MessageBus) SetEventPublisher(p EventPublisher) {
+	mb.eventPublisher.Store(p)
+}
+
 // GetStreamer returns a Streamer for the given channel+chatID via the delegate.
 func (mb *MessageBus) GetStreamer(ctx context.Context, channel, chatID string) (Streamer, bool) {
 	if d, ok := mb.streamDelegate.Load().(StreamDelegate); ok && d != nil {
@@ -156,6 +191,7 @@ func (mb *MessageBus) GetStreamer(ctx context.Context, channel, chatID string) (
 
 func (mb *MessageBus) Close() {
 	mb.closeOnce.Do(func() {
+		mb.publishCloseEvent(runtimeevents.KindBusCloseStarted, 0)
 		// notify all blocked publishers to exit
 		close(mb.done)
 
@@ -195,6 +231,8 @@ func (mb *MessageBus) Close() {
 			logger.DebugCF("bus", "Drained buffered messages during close", map[string]any{
 				"count": drained,
 			})
+			mb.publishCloseEvent(runtimeevents.KindBusCloseDrained, drained)
 		}
+		mb.publishCloseEvent(runtimeevents.KindBusCloseCompleted, drained)
 	})
 }

pkg/bus/bus_test.go

@@ -5,6 +5,8 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 )
 
 func TestPublishConsume(t *testing.T) {
@@ -171,6 +173,76 @@ func TestPublishInbound_BackfillsContextFromLegacyFields(t *testing.T) {
 	}
 }
 
+func TestMessageBusPublishesRuntimeFailureAndCloseEvents(t *testing.T) {
+	eventBus := runtimeevents.NewBus()
+	defer func() {
+		if err := eventBus.Close(); err != nil {
+			t.Errorf("event bus close failed: %v", err)
+		}
+	}()
+
+	_, eventsCh, err := eventBus.Channel().OfKind(
+		runtimeevents.KindBusPublishFailed,
+		runtimeevents.KindBusCloseStarted,
+		runtimeevents.KindBusCloseDrained,
+		runtimeevents.KindBusCloseCompleted,
+	).SubscribeChan(t.Context(), runtimeevents.SubscribeOptions{Name: "bus-events", Buffer: 4})
+	if err != nil {
+		t.Fatalf("SubscribeChan failed: %v", err)
+	}
+
+	mb := NewMessageBus()
+	mb.SetEventPublisher(eventBus)
+
+	if err := mb.PublishInbound(context.Background(), InboundMessage{}); err == nil {
+		t.Fatal("expected PublishInbound to fail")
+	}
+	failed := receiveBusRuntimeEvent(t, eventsCh)
+	if failed.Kind != runtimeevents.KindBusPublishFailed ||
+		failed.Source.Name != "inbound" ||
+		failed.Severity != runtimeevents.SeverityError {
+		t.Fatalf("publish failed event = %+v", failed)
+	}
+
+	if err := mb.PublishOutbound(context.Background(), OutboundMessage{
+		Context: NewOutboundContext("telegram", "chat-1", ""),
+		Content: "queued",
+	}); err != nil {
+		t.Fatalf("PublishOutbound failed: %v", err)
+	}
+	mb.Close()
+
+	seen := map[runtimeevents.Kind]bool{}
+	for range 3 {
+		evt := receiveBusRuntimeEvent(t, eventsCh)
+		seen[evt.Kind] = true
+	}
+	for _, kind := range []runtimeevents.Kind{
+		runtimeevents.KindBusCloseStarted,
+		runtimeevents.KindBusCloseDrained,
+		runtimeevents.KindBusCloseCompleted,
+	} {
+		if !seen[kind] {
+			t.Fatalf("missing %s event, seen=%v", kind, seen)
+		}
+	}
+}
+
+func receiveBusRuntimeEvent(t *testing.T, ch <-chan runtimeevents.Event) runtimeevents.Event {
+	t.Helper()
+
+	select {
+	case evt, ok := <-ch:
+		if !ok {
+			t.Fatal("runtime event channel closed before expected event")
+		}
+		return evt
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for runtime event")
+		return runtimeevents.Event{}
+	}
+}
+
 func TestPublishOutboundSubscribe(t *testing.T) {
 	mb := NewMessageBus()
 	defer mb.Close()

pkg/bus/events.go

@@ -0,0 +1,88 @@
+package bus
+
+import (
+	"context"
+	"time"
+
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
+)
+
+const busEventPublishTimeout = 100 * time.Millisecond
+
+type busPublishFailedPayload struct {
+	Stream string `json:"stream"`
+	Error  string `json:"error"`
+}
+
+type busClosePayload struct {
+	Drained int `json:"drained,omitempty"`
+}
+
+func (mb *MessageBus) publishFailure(stream string, scope runtimeevents.Scope, err error) {
+	if mb == nil || err == nil {
+		return
+	}
+	publisher, ok := mb.eventPublisher.Load().(EventPublisher)
+	if !ok || publisher == nil {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), busEventPublishTimeout)
+	defer cancel()
+	publisher.Publish(ctx, runtimeevents.Event{
+		Kind:     runtimeevents.KindBusPublishFailed,
+		Source:   runtimeevents.Source{Component: "bus", Name: stream},
+		Scope:    scope,
+		Severity: runtimeevents.SeverityError,
+		Payload: busPublishFailedPayload{
+			Stream: stream,
+			Error:  err.Error(),
+		},
+	})
+}
+
+func (mb *MessageBus) publishCloseEvent(kind runtimeevents.Kind, drained int) {
+	if mb == nil {
+		return
+	}
+	publisher, ok := mb.eventPublisher.Load().(EventPublisher)
+	if !ok || publisher == nil {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), busEventPublishTimeout)
+	defer cancel()
+	publisher.Publish(ctx, runtimeevents.Event{
+		Kind:     kind,
+		Source:   runtimeevents.Source{Component: "bus"},
+		Severity: runtimeevents.SeverityInfo,
+		Payload:  busClosePayload{Drained: drained},
+	})
+}
+
+func runtimeScopeFromInboundContext(ctx InboundContext) runtimeevents.Scope {
+	return runtimeevents.Scope{
+		Channel:   ctx.Channel,
+		Account:   ctx.Account,
+		ChatID:    ctx.ChatID,
+		TopicID:   ctx.TopicID,
+		SpaceID:   ctx.SpaceID,
+		SpaceType: ctx.SpaceType,
+		ChatType:  ctx.ChatType,
+		SenderID:  ctx.SenderID,
+		MessageID: ctx.MessageID,
+	}
+}
+
+func runtimeScopeFromAudioChunk(chunk AudioChunk) runtimeevents.Scope {
+	return runtimeevents.Scope{
+		Channel: chunk.Channel,
+		ChatID:  chunk.ChatID,
+	}
+}
+
+func runtimeScopeFromVoiceControl(ctrl VoiceControl) runtimeevents.Scope {
+	return runtimeevents.Scope{
+		ChatID: ctrl.ChatID,
+	}
+}

pkg/channels/events.go

@@ -0,0 +1,168 @@
+package channels
+
+import (
+	"context"
+	"time"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
+)
+
+const channelEventPublishTimeout = 100 * time.Millisecond
+
+func channelTypeForEvent(m *Manager, channelName string) string {
+	if m == nil || m.config == nil {
+		return channelName
+	}
+	if bc := m.config.Channels.Get(channelName); bc != nil && bc.Type != "" {
+		return bc.Type
+	}
+	return channelName
+}
+
+func (m *Manager) publishChannelEvent(
+	kind runtimeevents.Kind,
+	channelName string,
+	scope runtimeevents.Scope,
+	severity runtimeevents.Severity,
+	payload any,
+) {
+	if m == nil || m.runtimeEvents == nil {
+		return
+	}
+	if scope.Channel == "" {
+		scope.Channel = channelName
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), channelEventPublishTimeout)
+	defer cancel()
+	m.runtimeEvents.Publish(ctx, runtimeevents.Event{
+		Kind:     kind,
+		Source:   runtimeevents.Source{Component: "channel", Name: channelName},
+		Scope:    scope,
+		Severity: severity,
+		Payload:  payload,
+	})
+}
+
+func (m *Manager) publishOutboundSent(
+	channelName string,
+	msg bus.OutboundMessage,
+	messageIDs []string,
+) {
+	m.publishChannelEvent(
+		runtimeevents.KindChannelMessageOutboundSent,
+		channelName,
+		scopeFromOutboundContext(msg.Context),
+		runtimeevents.SeverityInfo,
+		ChannelOutboundPayload{
+			ContentLen:       len([]rune(msg.Content)),
+			MessageIDs:       append([]string(nil), messageIDs...),
+			ReplyToMessageID: msg.ReplyToMessageID,
+		},
+	)
+}
+
+func (m *Manager) publishOutboundQueued(
+	channelName string,
+	msg bus.OutboundMessage,
+) {
+	m.publishChannelEvent(
+		runtimeevents.KindChannelMessageOutboundQueued,
+		channelName,
+		scopeFromOutboundContext(msg.Context),
+		runtimeevents.SeverityInfo,
+		ChannelOutboundPayload{
+			ContentLen:       len([]rune(msg.Content)),
+			ReplyToMessageID: msg.ReplyToMessageID,
+		},
+	)
+}
+
+func (m *Manager) publishOutboundFailed(
+	channelName string,
+	msg bus.OutboundMessage,
+	err error,
+	media bool,
+) {
+	payload := ChannelOutboundPayload{
+		Media:            media,
+		ContentLen:       len([]rune(msg.Content)),
+		ReplyToMessageID: msg.ReplyToMessageID,
+		Retries:          maxRetries,
+	}
+	if err != nil {
+		payload.Error = err.Error()
+	}
+	m.publishChannelEvent(
+		runtimeevents.KindChannelMessageOutboundFailed,
+		channelName,
+		scopeFromOutboundContext(msg.Context),
+		runtimeevents.SeverityError,
+		payload,
+	)
+}
+
+func (m *Manager) publishOutboundMediaSent(
+	channelName string,
+	msg bus.OutboundMediaMessage,
+	messageIDs []string,
+) {
+	m.publishChannelEvent(
+		runtimeevents.KindChannelMessageOutboundSent,
+		channelName,
+		scopeFromOutboundContext(msg.Context),
+		runtimeevents.SeverityInfo,
+		ChannelOutboundPayload{
+			Media:      true,
+			MessageIDs: append([]string(nil), messageIDs...),
+		},
+	)
+}
+
+func (m *Manager) publishOutboundMediaQueued(
+	channelName string,
+	msg bus.OutboundMediaMessage,
+) {
+	m.publishChannelEvent(
+		runtimeevents.KindChannelMessageOutboundQueued,
+		channelName,
+		scopeFromOutboundContext(msg.Context),
+		runtimeevents.SeverityInfo,
+		ChannelOutboundPayload{Media: true},
+	)
+}
+
+func (m *Manager) publishOutboundMediaFailed(
+	channelName string,
+	msg bus.OutboundMediaMessage,
+	err error,
+) {
+	payload := ChannelOutboundPayload{
+		Media:   true,
+		Retries: maxRetries,
+	}
+	if err != nil {
+		payload.Error = err.Error()
+	}
+	m.publishChannelEvent(
+		runtimeevents.KindChannelMessageOutboundFailed,
+		channelName,
+		scopeFromOutboundContext(msg.Context),
+		runtimeevents.SeverityError,
+		payload,
+	)
+}
+
+func scopeFromOutboundContext(ctx bus.InboundContext) runtimeevents.Scope {
+	return runtimeevents.Scope{
+		Channel:   ctx.Channel,
+		Account:   ctx.Account,
+		ChatID:    ctx.ChatID,
+		TopicID:   ctx.TopicID,
+		SpaceID:   ctx.SpaceID,
+		SpaceType: ctx.SpaceType,
+		ChatType:  ctx.ChatType,
+		SenderID:  ctx.SenderID,
+		MessageID: ctx.MessageID,
+	}
+}

pkg/channels/manager.go

@@ -23,6 +23,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/constants"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/health"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/media"
@@ -84,6 +85,7 @@ type Manager struct {
 	channels      map[string]Channel
 	workers       map[string]*channelWorker
 	bus           *bus.MessageBus
+	runtimeEvents runtimeevents.Bus
 	config        *config.Config
 	mediaStore    media.MediaStore
 	dispatchTask  *asyncTask
@@ -98,6 +100,32 @@ type Manager struct {
 	channelHashes map[string]string // channel name → config hash
 }
 
+// ManagerOption configures a channel Manager.
+type ManagerOption func(*Manager)
+
+// WithRuntimeEvents injects the runtime event bus used for channel observations.
+func WithRuntimeEvents(eventBus runtimeevents.Bus) ManagerOption {
+	return func(m *Manager) {
+		m.runtimeEvents = eventBus
+	}
+}
+
+// ChannelLifecyclePayload describes channel lifecycle runtime events.
+type ChannelLifecyclePayload struct {
+	Type  string `json:"type,omitempty"`
+	Error string `json:"error,omitempty"`
+}
+
+// ChannelOutboundPayload describes channel outbound message runtime events.
+type ChannelOutboundPayload struct {
+	Media            bool     `json:"media,omitempty"`
+	ContentLen       int      `json:"content_len,omitempty"`
+	MessageIDs       []string `json:"message_ids,omitempty"`
+	ReplyToMessageID string   `json:"reply_to_message_id,omitempty"`
+	Error            string   `json:"error,omitempty"`
+	Retries          int      `json:"retries,omitempty"`
+}
+
 type toolFeedbackMessageTracker interface {
 	RecordToolFeedbackMessage(chatID, messageID, content string)
 	ClearToolFeedbackMessage(chatID string)
@@ -395,7 +423,12 @@ func (m *Manager) preSendMedia(ctx context.Context, name string, msg bus.Outboun
 	}
 }
 
-func NewManager(cfg *config.Config, messageBus *bus.MessageBus, store media.MediaStore) (*Manager, error) {
+func NewManager(
+	cfg *config.Config,
+	messageBus *bus.MessageBus,
+	store media.MediaStore,
+	opts ...ManagerOption,
+) (*Manager, error) {
 	m := &Manager{
 		channels:      make(map[string]Channel),
 		workers:       make(map[string]*channelWorker),
@@ -404,6 +437,11 @@ func NewManager(cfg *config.Config, messageBus *bus.MessageBus, store media.Medi
 		mediaStore:    store,
 		channelHashes: make(map[string]string),
 	}
+	for _, opt := range opts {
+		if opt != nil {
+			opt(m)
+		}
+	}
 
 	// Register as streaming delegate so the agent loop can obtain streamers
 	messageBus.SetStreamDelegate(m)
@@ -528,6 +566,13 @@ func (m *Manager) initChannel(typeName, channelName string) {
 			setter.SetOwner(ch)
 		}
 		m.channels[channelName] = ch
+		m.publishChannelEvent(
+			runtimeevents.KindChannelLifecycleInitialized,
+			channelName,
+			runtimeevents.Scope{Channel: channelName},
+			runtimeevents.SeverityInfo,
+			ChannelLifecyclePayload{Type: typeName},
+		)
 		logger.InfoCF("channels", "Channel enabled successfully", map[string]any{
 			"channel": channelName,
 			"type":    typeName,
@@ -673,6 +718,13 @@ func (m *Manager) registerHTTPHandlersLocked() {
 func (m *Manager) registerChannelHTTPHandler(name string, ch Channel) {
 	if wh, ok := ch.(WebhookHandler); ok {
 		m.mux.Handle(wh.WebhookPath(), wh)
+		m.publishChannelEvent(
+			runtimeevents.KindChannelWebhookRegistered,
+			name,
+			runtimeevents.Scope{Channel: name},
+			runtimeevents.SeverityInfo,
+			ChannelLifecyclePayload{Type: channelTypeForEvent(m, name)},
+		)
 		logger.InfoCF("channels", "Webhook handler registered", map[string]any{
 			"channel": name,
 			"path":    wh.WebhookPath(),
@@ -692,6 +744,13 @@ func (m *Manager) registerChannelHTTPHandler(name string, ch Channel) {
 func (m *Manager) unregisterChannelHTTPHandler(name string, ch Channel) {
 	if wh, ok := ch.(WebhookHandler); ok {
 		m.mux.Unhandle(wh.WebhookPath())
+		m.publishChannelEvent(
+			runtimeevents.KindChannelWebhookUnregistered,
+			name,
+			runtimeevents.Scope{Channel: name},
+			runtimeevents.SeverityInfo,
+			ChannelLifecyclePayload{Type: channelTypeForEvent(m, name)},
+		)
 		logger.InfoCF("channels", "Webhook handler unregistered", map[string]any{
 			"channel": name,
 			"path":    wh.WebhookPath(),
@@ -730,6 +789,13 @@ func (m *Manager) StartAll(ctx context.Context) error {
 				"channel": name,
 				"error":   err.Error(),
 			})
+			m.publishChannelEvent(
+				runtimeevents.KindChannelLifecycleStartFailed,
+				name,
+				runtimeevents.Scope{Channel: name},
+				runtimeevents.SeverityError,
+				ChannelLifecyclePayload{Type: channelTypeForEvent(m, name), Error: err.Error()},
+			)
 			failedStarts = append(failedStarts, fmt.Errorf("channel %s: %w", name, err))
 			failedNames = append(failedNames, name)
 			continue
@@ -745,6 +811,13 @@ func (m *Manager) StartAll(ctx context.Context) error {
 		m.workers[name] = w
 		go m.runWorker(dispatchCtx, name, w)
 		go m.runMediaWorker(dispatchCtx, name, w)
+		m.publishChannelEvent(
+			runtimeevents.KindChannelLifecycleStarted,
+			name,
+			runtimeevents.Scope{Channel: name},
+			runtimeevents.SeverityInfo,
+			ChannelLifecyclePayload{Type: channelType},
+		)
 	}
 
 	if len(m.channels) > 0 && len(m.workers) == 0 {
@@ -881,7 +954,15 @@ func (m *Manager) StopAll(ctx context.Context) error {
 				"channel": name,
 				"error":   err.Error(),
 			})
+			continue
 		}
+		m.publishChannelEvent(
+			runtimeevents.KindChannelLifecycleStopped,
+			name,
+			runtimeevents.Scope{Channel: name},
+			runtimeevents.SeverityInfo,
+			ChannelLifecyclePayload{Type: channelTypeForEvent(m, name)},
+		)
 	}
 
 	logger.InfoC("channels", "All channels stopped")
@@ -991,11 +1072,23 @@ func (m *Manager) sendWithRetry(
 	// Rate limit: wait for token
 	if err := w.limiter.Wait(ctx); err != nil {
 		// ctx canceled, shutting down
+		m.publishChannelEvent(
+			runtimeevents.KindChannelRateLimited,
+			name,
+			scopeFromOutboundContext(msg.Context),
+			runtimeevents.SeverityWarn,
+			ChannelOutboundPayload{
+				ContentLen:       len([]rune(msg.Content)),
+				ReplyToMessageID: msg.ReplyToMessageID,
+				Error:            err.Error(),
+			},
+		)
 		return nil, false
 	}
 
 	// Pre-send: stop typing and try to edit placeholder
 	if msgIDs, handled := m.preSend(ctx, name, msg, w.ch); handled {
+		m.publishOutboundSent(name, msg, msgIDs)
 		return msgIDs, true
 	}
 
@@ -1004,6 +1097,7 @@ func (m *Manager) sendWithRetry(
 	for attempt := 0; attempt <= maxRetries; attempt++ {
 		msgIDs, lastErr = w.ch.Send(ctx, msg)
 		if lastErr == nil {
+			m.publishOutboundSent(name, msg, msgIDs)
 			return msgIDs, true
 		}
 
@@ -1043,6 +1137,7 @@ func (m *Manager) sendWithRetry(
 		"error":   lastErr.Error(),
 		"retries": maxRetries,
 	})
+	m.publishOutboundFailed(name, msg, lastErr, false)
 
 	return nil, false
 }
@@ -1105,6 +1200,7 @@ func (m *Manager) dispatchOutbound(ctx context.Context) {
 		func(ctx context.Context, w *channelWorker, msg bus.OutboundMessage) bool {
 			select {
 			case w.queue <- msg:
+				m.publishOutboundQueued(outboundMessageChannel(msg), msg)
 				return true
 			case <-ctx.Done():
 				return false
@@ -1125,6 +1221,7 @@ func (m *Manager) dispatchOutboundMedia(ctx context.Context) {
 		func(ctx context.Context, w *channelWorker, msg bus.OutboundMediaMessage) bool {
 			select {
 			case w.mediaQueue <- msg:
+				m.publishOutboundMediaQueued(outboundMediaChannel(msg), msg)
 				return true
 			case <-ctx.Done():
 				return false
@@ -1174,6 +1271,16 @@ func (m *Manager) sendMediaWithRetry(
 
 	// Rate limit: wait for token
 	if err := w.limiter.Wait(ctx); err != nil {
+		m.publishChannelEvent(
+			runtimeevents.KindChannelRateLimited,
+			name,
+			scopeFromOutboundContext(msg.Context),
+			runtimeevents.SeverityWarn,
+			ChannelOutboundPayload{
+				Media: true,
+				Error: err.Error(),
+			},
+		)
 		return nil, err
 	}
 
@@ -1185,6 +1292,7 @@ func (m *Manager) sendMediaWithRetry(
 	for attempt := 0; attempt <= maxRetries; attempt++ {
 		msgIDs, lastErr = ms.SendMedia(ctx, msg)
 		if lastErr == nil {
+			m.publishOutboundMediaSent(name, msg, msgIDs)
 			return msgIDs, nil
 		}
 
@@ -1224,6 +1332,7 @@ func (m *Manager) sendMediaWithRetry(
 		"error":   lastErr.Error(),
 		"retries": maxRetries,
 	})
+	m.publishOutboundMediaFailed(name, msg, lastErr)
 	return nil, lastErr
 }
 
@@ -1361,6 +1470,13 @@ func (m *Manager) Reload(ctx context.Context, cfg *config.Config) error {
 				"channel": name,
 				"error":   err.Error(),
 			})
+			m.publishChannelEvent(
+				runtimeevents.KindChannelLifecycleStartFailed,
+				name,
+				runtimeevents.Scope{Channel: name},
+				runtimeevents.SeverityError,
+				ChannelLifecyclePayload{Type: channelTypeForEvent(m, name), Error: err.Error()},
+			)
 			continue
 		}
 		// Lazily create worker only after channel starts successfully
@@ -1374,6 +1490,13 @@ func (m *Manager) Reload(ctx context.Context, cfg *config.Config) error {
 		m.workers[name] = w
 		go m.runWorker(dispatchCtx, name, w)
 		go m.runMediaWorker(dispatchCtx, name, w)
+		m.publishChannelEvent(
+			runtimeevents.KindChannelLifecycleStarted,
+			name,
+			runtimeevents.Scope{Channel: name},
+			runtimeevents.SeverityInfo,
+			ChannelLifecyclePayload{Type: channelType},
+		)
 		deferFuncs = append(deferFuncs, func() {
 			m.RegisterChannel(name, channel)
 		})
@@ -1496,6 +1619,7 @@ func (m *Manager) SendToChannel(ctx context.Context, channelName, chatID, conten
 	if wExists && w != nil {
 		select {
 		case w.queue <- msg:
+			m.publishOutboundQueued(channelName, msg)
 			return nil
 		case <-ctx.Done():
 			return ctx.Err()

pkg/channels/manager_test.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/config"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
@@ -242,6 +243,57 @@ func TestStartAll_PartialFailure_StartsSuccessfulWorkers(t *testing.T) {
 	}
 }
 
+func TestStartAllPublishesLifecycleRuntimeEvents(t *testing.T) {
+	eventBus := runtimeevents.NewBus()
+	defer func() {
+		if err := eventBus.Close(); err != nil {
+			t.Errorf("event bus close failed: %v", err)
+		}
+	}()
+
+	_, eventsCh, err := eventBus.Channel().SubscribeChan(
+		t.Context(),
+		runtimeevents.SubscribeOptions{Name: "channel-lifecycle", Buffer: 4},
+	)
+	if err != nil {
+		t.Fatalf("SubscribeChan failed: %v", err)
+	}
+
+	m := newTestManager()
+	m.runtimeEvents = eventBus
+	m.config = &config.Config{Channels: config.ChannelsConfig{}}
+	m.channels["good"] = &mockChannel{}
+	m.channels["bad"] = &mockChannel{
+		startFn: func(_ context.Context) error { return errors.New("bad start") },
+	}
+
+	if err := m.StartAll(t.Context()); err != nil {
+		t.Fatalf("StartAll() error = %v", err)
+	}
+	t.Cleanup(func() {
+		stopCtx, cancel := context.WithTimeout(context.Background(), time.Second)
+		defer cancel()
+		if err := m.StopAll(stopCtx); err != nil {
+			t.Errorf("StopAll() error = %v", err)
+		}
+	})
+
+	events := []runtimeevents.Event{
+		receiveChannelRuntimeEvent(t, eventsCh),
+		receiveChannelRuntimeEvent(t, eventsCh),
+	}
+	seen := map[runtimeevents.Kind]runtimeevents.Event{}
+	for _, evt := range events {
+		seen[evt.Kind] = evt
+	}
+	if evt, ok := seen[runtimeevents.KindChannelLifecycleStarted]; !ok || evt.Scope.Channel != "good" {
+		t.Fatalf("missing started event for good channel: %+v", events)
+	}
+	if evt, ok := seen[runtimeevents.KindChannelLifecycleStartFailed]; !ok || evt.Scope.Channel != "bad" {
+		t.Fatalf("missing failed event for bad channel: %+v", events)
+	}
+}
+
 func testOutboundMessage(msg bus.OutboundMessage) bus.OutboundMessage {
 	if msg.Context.Channel == "" && msg.Context.ChatID == "" {
 		msg.Context = bus.NewOutboundContext(msg.Channel, msg.ChatID, msg.ReplyToMessageID)
@@ -256,6 +308,21 @@ func testOutboundMediaMessage(msg bus.OutboundMediaMessage) bus.OutboundMediaMes
 	return bus.NormalizeOutboundMediaMessage(msg)
 }
 
+func receiveChannelRuntimeEvent(t *testing.T, ch <-chan runtimeevents.Event) runtimeevents.Event {
+	t.Helper()
+
+	select {
+	case evt, ok := <-ch:
+		if !ok {
+			t.Fatal("runtime event channel closed before expected event")
+		}
+		return evt
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for runtime event")
+		return runtimeevents.Event{}
+	}
+}
+
 func TestSendWithRetry_Success(t *testing.T) {
 	m := newTestManager()
 	var callCount int
@@ -280,6 +347,63 @@ func TestSendWithRetry_Success(t *testing.T) {
 	}
 }
 
+func TestSendWithRetryPublishesOutboundRuntimeEvents(t *testing.T) {
+	eventBus := runtimeevents.NewBus()
+	defer func() {
+		if err := eventBus.Close(); err != nil {
+			t.Errorf("event bus close failed: %v", err)
+		}
+	}()
+
+	_, eventsCh, err := eventBus.Channel().OfKind(
+		runtimeevents.KindChannelMessageOutboundSent,
+		runtimeevents.KindChannelMessageOutboundFailed,
+	).SubscribeChan(t.Context(), runtimeevents.SubscribeOptions{Name: "channel-outbound", Buffer: 2})
+	if err != nil {
+		t.Fatalf("SubscribeChan failed: %v", err)
+	}
+
+	m := newTestManager()
+	m.runtimeEvents = eventBus
+
+	successWorker := &channelWorker{
+		ch:      &mockChannel{},
+		limiter: rate.NewLimiter(rate.Inf, 1),
+	}
+	m.sendWithRetry(
+		context.Background(),
+		"test",
+		successWorker,
+		testOutboundMessage(bus.OutboundMessage{Channel: "test", ChatID: "chat-1", Content: "hello"}),
+	)
+	sent := receiveChannelRuntimeEvent(t, eventsCh)
+	if sent.Kind != runtimeevents.KindChannelMessageOutboundSent || sent.Scope.ChatID != "chat-1" {
+		t.Fatalf("sent event = %+v", sent)
+	}
+
+	failWorker := &channelWorker{
+		ch: &mockChannel{
+			sendFn: func(context.Context, bus.OutboundMessage) error {
+				return fmt.Errorf("send failed: %w", ErrSendFailed)
+			},
+		},
+		limiter: rate.NewLimiter(rate.Inf, 1),
+	}
+	m.sendWithRetry(
+		context.Background(),
+		"test",
+		failWorker,
+		testOutboundMessage(bus.OutboundMessage{Channel: "test", ChatID: "chat-2", Content: "hello"}),
+	)
+	failed := receiveChannelRuntimeEvent(t, eventsCh)
+	if failed.Kind != runtimeevents.KindChannelMessageOutboundFailed || failed.Scope.ChatID != "chat-2" {
+		t.Fatalf("failed event = %+v", failed)
+	}
+	if failed.Severity != runtimeevents.SeverityError {
+		t.Fatalf("failed severity = %q", failed.Severity)
+	}
+}
+
 func TestSendWithRetry_TemporaryThenSuccess(t *testing.T) {
 	m := newTestManager()
 	var callCount int

pkg/events/kind.go

@@ -47,12 +47,33 @@ const (
 
 	// KindChannelLifecycleStarted is emitted when a channel starts.
 	KindChannelLifecycleStarted Kind = "channel.lifecycle.started"
+	// KindChannelLifecycleInitialized is emitted when a channel is initialized.
+	KindChannelLifecycleInitialized Kind = "channel.lifecycle.initialized"
 	// KindChannelLifecycleStartFailed is emitted when a channel fails to start.
 	KindChannelLifecycleStartFailed Kind = "channel.lifecycle.start_failed"
+	// KindChannelLifecycleStopped is emitted when a channel stops.
+	KindChannelLifecycleStopped Kind = "channel.lifecycle.stopped"
+	// KindChannelWebhookRegistered is emitted when a channel webhook is registered.
+	KindChannelWebhookRegistered Kind = "channel.webhook.registered"
+	// KindChannelWebhookUnregistered is emitted when a channel webhook is unregistered.
+	KindChannelWebhookUnregistered Kind = "channel.webhook.unregistered"
+	// KindChannelMessageOutboundQueued is emitted when an outbound message is queued.
+	KindChannelMessageOutboundQueued Kind = "channel.message.outbound_queued"
 	// KindChannelMessageOutboundSent is emitted when an outbound channel message is sent.
 	KindChannelMessageOutboundSent Kind = "channel.message.outbound_sent"
 	// KindChannelMessageOutboundFailed is emitted when an outbound channel message fails.
 	KindChannelMessageOutboundFailed Kind = "channel.message.outbound_failed"
+	// KindChannelRateLimited is emitted when channel rate limiting blocks delivery.
+	KindChannelRateLimited Kind = "channel.rate_limited"
+
+	// KindBusPublishFailed is emitted when message bus publish fails.
+	KindBusPublishFailed Kind = "bus.publish.failed"
+	// KindBusCloseStarted is emitted when message bus close starts.
+	KindBusCloseStarted Kind = "bus.close.started"
+	// KindBusCloseCompleted is emitted when message bus close completes.
+	KindBusCloseCompleted Kind = "bus.close.completed"
+	// KindBusCloseDrained is emitted when message bus close drains buffered messages.
+	KindBusCloseDrained Kind = "bus.close.drained"
 
 	// KindGatewayReloadStarted is emitted when gateway reload starts.
 	KindGatewayReloadStarted Kind = "gateway.reload.started"
@@ -63,6 +84,14 @@ const (
 
 	// KindMCPServerConnected is emitted when an MCP server connects.
 	KindMCPServerConnected Kind = "mcp.server.connected"
+	// KindMCPServerConnecting is emitted before connecting to an MCP server.
+	KindMCPServerConnecting Kind = "mcp.server.connecting"
 	// KindMCPServerFailed is emitted when an MCP server fails.
 	KindMCPServerFailed Kind = "mcp.server.failed"
+	// KindMCPToolDiscovered is emitted when an MCP tool is discovered.
+	KindMCPToolDiscovered Kind = "mcp.tool.discovered"
+	// KindMCPToolCallStart is emitted when an MCP tool call starts.
+	KindMCPToolCallStart Kind = "mcp.tool.call.start"
+	// KindMCPToolCallEnd is emitted when an MCP tool call ends.
+	KindMCPToolCallEnd Kind = "mcp.tool.call.end"
 )

pkg/gateway/events.go

@@ -0,0 +1,46 @@
+package gateway
+
+import (
+	"context"
+	"time"
+
+	"github.com/sipeed/picoclaw/pkg/agent"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
+)
+
+const gatewayEventPublishTimeout = 100 * time.Millisecond
+
+type gatewayReloadPayload struct {
+	DurationMS int64  `json:"duration_ms,omitempty"`
+	Error      string `json:"error,omitempty"`
+}
+
+func publishGatewayReloadEvent(
+	al *agent.AgentLoop,
+	kind runtimeevents.Kind,
+	startedAt time.Time,
+	err error,
+) {
+	if al == nil || al.RuntimeEventBus() == nil {
+		return
+	}
+
+	severity := runtimeevents.SeverityInfo
+	payload := gatewayReloadPayload{}
+	if !startedAt.IsZero() {
+		payload.DurationMS = time.Since(startedAt).Milliseconds()
+	}
+	if err != nil {
+		severity = runtimeevents.SeverityError
+		payload.Error = err.Error()
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), gatewayEventPublishTimeout)
+	defer cancel()
+	al.RuntimeEventBus().Publish(ctx, runtimeevents.Event{
+		Kind:     kind,
+		Source:   runtimeevents.Source{Component: "gateway"},
+		Severity: severity,
+		Payload:  payload,
+	})
+}

pkg/gateway/gateway.go

@@ -39,6 +39,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/cron"
 	"github.com/sipeed/picoclaw/pkg/devices"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/health"
 	"github.com/sipeed/picoclaw/pkg/heartbeat"
 	"github.com/sipeed/picoclaw/pkg/logger"
@@ -197,6 +198,7 @@ func Run(debug bool, homePath, configPath string, allowEmptyStartup bool) (runEr
 
 	msgBus := bus.NewMessageBus()
 	agentLoop := agent.NewAgentLoop(cfg, msgBus, provider)
+	msgBus.SetEventPublisher(agentLoop.RuntimeEventBus())
 
 	fmt.Println("\n📦 Agent Status:")
 	startupInfo := agentLoop.GetStartupInfo()
@@ -312,10 +314,20 @@ func executeReload(
 	msgBus *bus.MessageBus,
 	allowEmptyStartup bool,
 	debug bool,
-) error {
+) (err error) {
+	startedAt := time.Now()
+	publishGatewayReloadEvent(agentLoop, runtimeevents.KindGatewayReloadStarted, startedAt, nil)
 	defer runningServices.reloading.Store(false)
+	defer func() {
+		if err != nil {
+			publishGatewayReloadEvent(agentLoop, runtimeevents.KindGatewayReloadFailed, startedAt, err)
+			return
+		}
+		publishGatewayReloadEvent(agentLoop, runtimeevents.KindGatewayReloadCompleted, startedAt, nil)
+	}()
 
-	return handleConfigReload(ctx, agentLoop, newCfg, provider, runningServices, msgBus, allowEmptyStartup, debug)
+	err = handleConfigReload(ctx, agentLoop, newCfg, provider, runningServices, msgBus, allowEmptyStartup, debug)
+	return err
 }
 
 func createStartupProvider(
@@ -383,7 +395,12 @@ func setupAndStartServices(
 		fms.Start()
 	}
 
-	runningServices.ChannelManager, err = channels.NewManager(cfg, msgBus, runningServices.MediaStore)
+	runningServices.ChannelManager, err = channels.NewManager(
+		cfg,
+		msgBus,
+		runningServices.MediaStore,
+		channels.WithRuntimeEvents(agentLoop.RuntimeEventBus()),
+	)
 	if err != nil {
 		if fms, ok := runningServices.MediaStore.(*media.FileMediaStore); ok {
 			fms.Stop()

pkg/mcp/events.go

@@ -0,0 +1,81 @@
+package mcp
+
+import (
+	"context"
+	"time"
+
+	"github.com/sipeed/picoclaw/pkg/config"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
+)
+
+const mcpEventPublishTimeout = 100 * time.Millisecond
+
+func (m *Manager) publishServerEvent(
+	kind runtimeevents.Kind,
+	serverName string,
+	cfg config.MCPServerConfig,
+	toolCount int,
+	err error,
+) {
+	if m == nil || m.runtimeEvents == nil {
+		return
+	}
+
+	severity := runtimeevents.SeverityInfo
+	if err != nil {
+		severity = runtimeevents.SeverityError
+	}
+	payload := ServerEventPayload{
+		Server:    serverName,
+		Type:      mcpTransportType(cfg),
+		URL:       cfg.URL,
+		Command:   cfg.Command,
+		ToolCount: toolCount,
+	}
+	if err != nil {
+		payload.Error = err.Error()
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), mcpEventPublishTimeout)
+	defer cancel()
+	m.runtimeEvents.Publish(ctx, runtimeevents.Event{
+		Kind:     kind,
+		Source:   runtimeevents.Source{Component: "mcp", Name: serverName},
+		Severity: severity,
+		Payload:  payload,
+	})
+}
+
+func (m *Manager) publishToolDiscovered(serverName string, cfg config.MCPServerConfig, toolName string) {
+	if m == nil || m.runtimeEvents == nil {
+		return
+	}
+	payload := ServerEventPayload{
+		Server:  serverName,
+		Type:    mcpTransportType(cfg),
+		URL:     cfg.URL,
+		Command: cfg.Command,
+		Tool:    toolName,
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), mcpEventPublishTimeout)
+	defer cancel()
+	m.runtimeEvents.Publish(ctx, runtimeevents.Event{
+		Kind:     runtimeevents.KindMCPToolDiscovered,
+		Source:   runtimeevents.Source{Component: "mcp", Name: serverName},
+		Severity: runtimeevents.SeverityInfo,
+		Payload:  payload,
+	})
+}
+
+func mcpTransportType(cfg config.MCPServerConfig) string {
+	if cfg.Type != "" {
+		return cfg.Type
+	}
+	if cfg.URL != "" {
+		return "sse"
+	}
+	if cfg.Command != "" {
+		return "stdio"
+	}
+	return ""
+}

pkg/mcp/manager.go

@@ -16,6 +16,7 @@ import (
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 
 	"github.com/sipeed/picoclaw/pkg/config"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/logger"
 )
 
@@ -127,19 +128,47 @@ type ServerConnection struct {
 
 // Manager manages multiple MCP server connections
 type Manager struct {
-	servers map[string]*ServerConnection
-	mu      sync.RWMutex
-	closed  atomic.Bool    // changed from bool to atomic.Bool to avoid TOCTOU race
-	wg      sync.WaitGroup // tracks in-flight CallTool calls
+	servers       map[string]*ServerConnection
+	runtimeEvents runtimeevents.Bus
+	mu            sync.RWMutex
+	closed        atomic.Bool    // changed from bool to atomic.Bool to avoid TOCTOU race
+	wg            sync.WaitGroup // tracks in-flight CallTool calls
 }
 
 var connectServerFunc = connectServer
 
+// ManagerOption configures an MCP manager.
+type ManagerOption func(*Manager)
+
+// WithRuntimeEvents injects the runtime event bus used for MCP observations.
+func WithRuntimeEvents(eventBus runtimeevents.Bus) ManagerOption {
+	return func(m *Manager) {
+		m.runtimeEvents = eventBus
+	}
+}
+
+// ServerEventPayload describes MCP server connection events.
+type ServerEventPayload struct {
+	Server    string `json:"server"`
+	Type      string `json:"type,omitempty"`
+	URL       string `json:"url,omitempty"`
+	Command   string `json:"command,omitempty"`
+	Tool      string `json:"tool,omitempty"`
+	ToolCount int    `json:"tool_count,omitempty"`
+	Error     string `json:"error,omitempty"`
+}
+
 // NewManager creates a new MCP manager
-func NewManager() *Manager {
-	return &Manager{
+func NewManager(opts ...ManagerOption) *Manager {
+	m := &Manager{
 		servers: make(map[string]*ServerConnection),
 	}
+	for _, opt := range opts {
+		if opt != nil {
+			opt(m)
+		}
+	}
+	return m
 }
 
 // LoadFromConfig loads MCP servers from configuration
@@ -264,8 +293,10 @@ func (m *Manager) ConnectServer(
 	name string,
 	cfg config.MCPServerConfig,
 ) error {
+	m.publishServerEvent(runtimeevents.KindMCPServerConnecting, name, cfg, 0, nil)
 	conn, err := connectServerFunc(ctx, name, cfg)
 	if err != nil {
+		m.publishServerEvent(runtimeevents.KindMCPServerFailed, name, cfg, 0, err)
 		return err
 	}
 
@@ -274,10 +305,19 @@ func (m *Manager) ConnectServer(
 
 	if m.closed.Load() {
 		_ = conn.Session.Close()
+		m.publishServerEvent(runtimeevents.KindMCPServerFailed, name, cfg, 0, fmt.Errorf("manager is closed"))
 		return fmt.Errorf("manager is closed")
 	}
 
 	m.servers[name] = conn
+	for _, tool := range conn.Tools {
+		toolName := ""
+		if tool != nil {
+			toolName = tool.Name
+		}
+		m.publishToolDiscovered(name, cfg, toolName)
+	}
+	m.publishServerEvent(runtimeevents.KindMCPServerConnected, name, cfg, len(conn.Tools), nil)
 	return nil
 }
 

pkg/mcp/manager_test.go

@@ -10,11 +10,13 @@ import (
 	"strings"
 	"sync"
 	"testing"
+	"time"
 
 	"github.com/modelcontextprotocol/go-sdk/jsonrpc"
 	sdkmcp "github.com/modelcontextprotocol/go-sdk/mcp"
 
 	"github.com/sipeed/picoclaw/pkg/config"
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 )
 
 func TestLoadEnvFile(t *testing.T) {
@@ -248,6 +250,87 @@ func TestNewManager_InitialState(t *testing.T) {
 	}
 }
 
+func TestConnectServerPublishesRuntimeEvents(t *testing.T) {
+	originalConnectServerFunc := connectServerFunc
+	t.Cleanup(func() {
+		connectServerFunc = originalConnectServerFunc
+	})
+
+	eventBus := runtimeevents.NewBus()
+	defer func() {
+		if err := eventBus.Close(); err != nil {
+			t.Errorf("event bus close failed: %v", err)
+		}
+	}()
+
+	_, eventsCh, err := eventBus.Channel().OfKind(
+		runtimeevents.KindMCPServerConnected,
+		runtimeevents.KindMCPServerFailed,
+	).SubscribeChan(t.Context(), runtimeevents.SubscribeOptions{Name: "mcp-events", Buffer: 2})
+	if err != nil {
+		t.Fatalf("SubscribeChan failed: %v", err)
+	}
+
+	connectServerFunc = func(
+		_ context.Context,
+		name string,
+		cfg config.MCPServerConfig,
+	) (*ServerConnection, error) {
+		if name == "bad" {
+			return nil, fmt.Errorf("connect failed")
+		}
+		return &ServerConnection{
+			Name:   name,
+			Config: cfg,
+			Tools:  []*sdkmcp.Tool{{Name: "echo"}},
+		}, nil
+	}
+
+	mgr := NewManager(WithRuntimeEvents(eventBus))
+	err = mgr.ConnectServer(context.Background(), "good", config.MCPServerConfig{
+		Type:    "stdio",
+		Command: "echo",
+	})
+	if err != nil {
+		t.Fatalf("ConnectServer(good) error = %v", err)
+	}
+	connected := receiveMCPRuntimeEvent(t, eventsCh)
+	if connected.Kind != runtimeevents.KindMCPServerConnected ||
+		connected.Source.Name != "good" ||
+		connected.Severity != runtimeevents.SeverityInfo {
+		t.Fatalf("connected event = %+v", connected)
+	}
+
+	err = mgr.ConnectServer(context.Background(), "bad", config.MCPServerConfig{
+		Type:    "stdio",
+		Command: "echo",
+	})
+	if err == nil {
+		t.Fatal("expected ConnectServer(bad) to fail")
+	}
+	failed := receiveMCPRuntimeEvent(t, eventsCh)
+	if failed.Kind != runtimeevents.KindMCPServerFailed ||
+		failed.Source.Name != "bad" ||
+		failed.Severity != runtimeevents.SeverityError {
+		t.Fatalf("failed event = %+v", failed)
+	}
+}
+
+func receiveMCPRuntimeEvent(t *testing.T, ch <-chan runtimeevents.Event) runtimeevents.Event {
+	t.Helper()
+
+	select {
+	case evt, ok := <-ch:
+		if !ok {
+			t.Fatal("runtime event channel closed before expected event")
+		}
+		return evt
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for runtime event")
+		return runtimeevents.Event{}
+	}
+}
+
 func TestLoadFromMCPConfig_DisabledOrEmptyServers(t *testing.T) {
 	mgr := NewManager()
 

pkg/tools/integration/mcp_tool.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/media"
 	toolshared "github.com/sipeed/picoclaw/pkg/tools/shared"
@@ -36,6 +37,16 @@ type MCPTool struct {
 	mediaStore         media.MediaStore
 	workspace          string
 	maxInlineTextRunes int
+	runtimeEvents      runtimeevents.Bus
+}
+
+// MCPToolCallPayload describes MCP tool execution runtime events.
+type MCPToolCallPayload struct {
+	Server     string `json:"server"`
+	Tool       string `json:"tool"`
+	DurationMS int64  `json:"duration_ms,omitempty"`
+	IsError    bool   `json:"is_error,omitempty"`
+	Error      string `json:"error,omitempty"`
 }
 
 // NewMCPTool creates a new MCP tool wrapper
@@ -62,6 +73,11 @@ func (t *MCPTool) SetMaxInlineTextRunes(limit int) {
 	}
 }
 
+// SetEventPublisher injects the runtime event bus used for MCP tool observations.
+func (t *MCPTool) SetEventPublisher(eventBus runtimeevents.Bus) {
+	t.runtimeEvents = eventBus
+}
+
 const maxMCPInlineTextRunes = 16 * 1024
 
 // sanitizeIdentifierComponent normalizes a string so it can be safely used
@@ -237,26 +253,74 @@ func (t *MCPTool) Parameters() map[string]any {
 
 // Execute executes the MCP tool
 func (t *MCPTool) Execute(ctx context.Context, args map[string]any) *ToolResult {
+	startedAt := time.Now()
+	t.publishRuntimeEvent(ctx, runtimeevents.KindMCPToolCallStart, startedAt, false, "")
+
 	result, err := t.manager.CallTool(ctx, t.serverName, t.tool.Name, args)
 	if err != nil {
+		t.publishRuntimeEvent(ctx, runtimeevents.KindMCPToolCallEnd, startedAt, true, err.Error())
 		return ErrorResult(fmt.Sprintf("MCP tool execution failed: %v", err)).WithError(err)
 	}
 
 	if result == nil {
 		nilErr := fmt.Errorf("MCP tool returned nil result without error")
+		t.publishRuntimeEvent(ctx, runtimeevents.KindMCPToolCallEnd, startedAt, true, nilErr.Error())
 		return ErrorResult("MCP tool execution failed: nil result").WithError(nilErr)
 	}
 
 	// Handle error result from server
 	if result.IsError {
 		errMsg := extractContentText(result.Content)
+		t.publishRuntimeEvent(ctx, runtimeevents.KindMCPToolCallEnd, startedAt, true, errMsg)
 		return ErrorResult(fmt.Sprintf("MCP tool returned error: %s", errMsg)).
 			WithError(fmt.Errorf("MCP tool error: %s", errMsg))
 	}
 
+	t.publishRuntimeEvent(ctx, runtimeevents.KindMCPToolCallEnd, startedAt, false, "")
 	return t.normalizeResultContent(ctx, result.Content)
 }
 
+func (t *MCPTool) publishRuntimeEvent(
+	ctx context.Context,
+	kind runtimeevents.Kind,
+	startedAt time.Time,
+	isError bool,
+	errMsg string,
+) {
+	if t == nil || t.runtimeEvents == nil {
+		return
+	}
+
+	scope := runtimeevents.Scope{
+		AgentID:    toolshared.ToolAgentID(ctx),
+		SessionKey: toolshared.ToolSessionKey(ctx),
+		Channel:    toolshared.ToolChannel(ctx),
+		ChatID:     toolshared.ToolChatID(ctx),
+		MessageID:  toolshared.ToolMessageID(ctx),
+	}
+	payload := MCPToolCallPayload{
+		Server:     t.serverName,
+		Tool:       t.tool.Name,
+		DurationMS: time.Since(startedAt).Milliseconds(),
+		IsError:    isError,
+		Error:      errMsg,
+	}
+	severity := runtimeevents.SeverityInfo
+	if isError {
+		severity = runtimeevents.SeverityError
+	}
+
+	publishCtx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+	defer cancel()
+	t.runtimeEvents.Publish(publishCtx, runtimeevents.Event{
+		Kind:     kind,
+		Source:   runtimeevents.Source{Component: "mcp", Name: t.serverName},
+		Scope:    scope,
+		Severity: severity,
+		Payload:  payload,
+	})
+}
+
 // extractContentText extracts text from MCP content array
 func extractContentText(content []mcp.Content) string {
 	var parts []string

pkg/tools/integration/mcp_tool_test.go

@@ -7,9 +7,11 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 
+	runtimeevents "github.com/sipeed/picoclaw/pkg/events"
 	"github.com/sipeed/picoclaw/pkg/media"
 	toolshared "github.com/sipeed/picoclaw/pkg/tools/shared"
 )
@@ -299,6 +301,72 @@ func TestMCPTool_Execute_Success(t *testing.T) {
 	}
 }
 
+func TestMCPTool_Execute_PublishesRuntimeEvents(t *testing.T) {
+	eventBus := runtimeevents.NewBus()
+	defer func() {
+		if err := eventBus.Close(); err != nil {
+			t.Errorf("event bus close failed: %v", err)
+		}
+	}()
+
+	_, eventsCh, err := eventBus.Channel().OfKind(
+		runtimeevents.KindMCPToolCallStart,
+		runtimeevents.KindMCPToolCallEnd,
+	).SubscribeChan(t.Context(), runtimeevents.SubscribeOptions{Name: "mcp-tool-events", Buffer: 2})
+	if err != nil {
+		t.Fatalf("SubscribeChan failed: %v", err)
+	}
+
+	manager := &MockMCPManager{}
+	mcpTool := NewMCPTool(manager, "github", &mcp.Tool{Name: "search_repos"})
+	mcpTool.SetEventPublisher(eventBus)
+
+	ctx := toolshared.WithToolContext(context.Background(), "telegram", "chat-1")
+	ctx = toolshared.WithToolMessageContext(ctx, "msg-1", "")
+	ctx = toolshared.WithToolSessionContext(ctx, "main", "session-1", nil)
+	result := mcpTool.Execute(ctx, map[string]any{"query": "picoclaw"})
+	if result == nil || result.IsError {
+		t.Fatalf("Execute result = %+v", result)
+	}
+
+	started := receiveMCPToolRuntimeEvent(t, eventsCh)
+	if started.Kind != runtimeevents.KindMCPToolCallStart ||
+		started.Scope.AgentID != "main" ||
+		started.Scope.SessionKey != "session-1" ||
+		started.Scope.Channel != "telegram" ||
+		started.Scope.ChatID != "chat-1" ||
+		started.Scope.MessageID != "msg-1" {
+		t.Fatalf("started event = %+v", started)
+	}
+
+	ended := receiveMCPToolRuntimeEvent(t, eventsCh)
+	if ended.Kind != runtimeevents.KindMCPToolCallEnd || ended.Severity != runtimeevents.SeverityInfo {
+		t.Fatalf("ended event = %+v", ended)
+	}
+	payload, ok := ended.Payload.(MCPToolCallPayload)
+	if !ok {
+		t.Fatalf("ended payload = %T, want MCPToolCallPayload", ended.Payload)
+	}
+	if payload.Server != "github" || payload.Tool != "search_repos" || payload.IsError {
+		t.Fatalf("ended payload = %+v", payload)
+	}
+}
+
+func receiveMCPToolRuntimeEvent(t *testing.T, ch <-chan runtimeevents.Event) runtimeevents.Event {
+	t.Helper()
+
+	select {
+	case evt, ok := <-ch:
+		if !ok {
+			t.Fatal("runtime event channel closed before expected event")
+		}
+		return evt
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for runtime event")
+		return runtimeevents.Event{}
+	}
+}
+
 // TestMCPTool_Execute_ManagerError tests execution when manager returns error
 func TestMCPTool_Execute_ManagerError(t *testing.T) {
 	manager := &MockMCPManager{