Feat(channels): unify animated tool feedback across chat channels and Pico (#2622)

* feat(channels): unify tool feedback animation across discord telegram and feishu

* fix(tool-feedback): unify fallback and single-message delivery

* fix(channels): finalize tool feedback in place

* fix ci

* feat: improve tool feedback

* fix review blockers in pico token cache and tool feedback

fix(provider): preserve function thought signatures

fix(feishu): recover tool feedback after edit fallback

* * delete dead code

* fix(pico): clean up tool feedback progress state

* fix ci

* fix(web): preserve tool feedback line breaks in chat

* fix(channels): preserve tool feedback progress state

fix(pico): preserve context usage when finalizing tool feedback

chore: record branch review pass

fix: preserve tool feedback finalization state

fix(web): handle pico history update fallback

* fix ci

cmd/picoclaw/internal/auth/wecom_test.go

@@ -3,6 +3,7 @@ package auth
 import (
 	"bytes"
 	"context"
+	"net"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -19,6 +20,19 @@ import (
 	"github.com/sipeed/picoclaw/pkg/config"
 )
 
+func newIPv4TestServer(t *testing.T, handler http.Handler) *httptest.Server {
+	t.Helper()
+
+	server := httptest.NewUnstartedServer(handler)
+	listener, err := net.Listen("tcp4", "127.0.0.1:0")
+	require.NoError(t, err)
+
+	server.Listener = listener
+	server.Start()
+	t.Cleanup(server.Close)
+	return server
+}
+
 func TestNewWeComCommand(t *testing.T) {
 	cmd := newWeComCommand()
 
@@ -53,7 +67,7 @@ func TestBuildWeComQRCodePageURL(t *testing.T) {
 }
 
 func TestFetchWeComQRCode(t *testing.T) {
-	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	server := newIPv4TestServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, "/generate", r.URL.Path)
 		assert.Equal(t, wecomQRSourceID, r.URL.Query().Get("source"))
 		assert.Equal(t, wecomQRSourceID, r.URL.Query().Get("sourceID"))
@@ -61,7 +75,6 @@ func TestFetchWeComQRCode(t *testing.T) {
 		w.Header().Set("Content-Type", "application/json")
 		_, _ = w.Write([]byte(`{"data":{"scode":"scode-1","auth_url":"https://example.com/qr"}}`))
 	}))
-	defer server.Close()
 
 	opts := normalizeWeComQRFlowOptions(wecomQRFlowOptions{
 		HTTPClient:  server.Client(),
@@ -78,7 +91,7 @@ func TestFetchWeComQRCode(t *testing.T) {
 func TestPollWeComQRCodeResult(t *testing.T) {
 	var calls atomic.Int32
 
-	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	server := newIPv4TestServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		call := calls.Add(1)
 		assert.Equal(t, "/query", r.URL.Path)
 		assert.Equal(t, "scode-1", r.URL.Query().Get("scode"))
@@ -92,7 +105,6 @@ func TestPollWeComQRCodeResult(t *testing.T) {
 			_, _ = w.Write([]byte(`{"data":{"status":"success","bot_info":{"botid":"bot-1","secret":"secret-1"}}}`))
 		}
 	}))
-	defer server.Close()
 
 	var output bytes.Buffer
 	opts := normalizeWeComQRFlowOptions(wecomQRFlowOptions{

docs/channels/discord/README.md

@@ -8,26 +8,56 @@ Discord is a free voice, video, and text chat application designed for communiti
 
 ```json
 {
+  "agents": {
+    "defaults": {
+      "tool_feedback": {
+        "enabled": true,
+        "max_args_length": 300
+      }
+    }
+  },
   "channel_list": {
     "discord": {
       "enabled": true,
       "type": "discord",
       "token": "YOUR_BOT_TOKEN",
       "allow_from": ["YOUR_USER_ID"],
+      "placeholder": {
+        "enabled": true,
+        "text": ["Thinking... 💭"]
+      },
       "group_trigger": {
         "mention_only": false
-      }
+      },
+      "reasoning_channel_id": ""
     }
   }
 }
 ```
 
 | Field                | Type   | Required | Description                                                                 |
-| ------------- | ------ | -------- | --------------------------------------------------------------------------- |
+| -------------------- | ------ | -------- | --------------------------------------------------------------------------- |
 | enabled              | bool   | Yes      | Whether to enable the Discord channel                                       |
 | token                | string | Yes      | Discord Bot Token                                                           |
 | allow_from           | array  | No       | Allowlist of user IDs; empty means all users are allowed                    |
+| placeholder          | object | No       | Placeholder message config shown while the agent is working                 |
 | group_trigger        | object | No       | Group trigger settings (example: { "mention_only": false })                 |
+| reasoning_channel_id | string | No       | Optional target channel ID for reasoning/thinking output                    |
+
+## Visible Execution Feedback
+
+Discord can show three different kinds of "working" feedback:
+
+1. Typing indicator: automatic, no extra config needed.
+2. Placeholder message: enable `channel_list.discord.placeholder.enabled` to send a visible `Thinking...` message that is later edited into the final reply.
+3. Tool execution feedback: enable `agents.defaults.tool_feedback.enabled` to send a short message before each tool call, for example:
+
+```text
+🔧 `web_search`
+Checking the latest PicoClaw release notes before I answer.
+```
+
+If you only see `Bot is typing`, check that `placeholder.enabled` or `tool_feedback.enabled` is actually set in your runtime config.
 
 ## Setup
 

pkg/agent/agent.go

@@ -112,6 +112,7 @@ const (
 	pendingTurnPrefix          = "pending-"
 	metadataKeyMessageKind     = "message_kind"
 	messageKindThought         = "thought"
+	messageKindToolFeedback    = "tool_feedback"
 	metadataKeyAccountID       = "account_id"
 	metadataKeyGuildID         = "guild_id"
 	metadataKeyTeamID          = "team_id"

pkg/agent/agent_test.go

@@ -24,6 +24,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/routing"
 	"github.com/sipeed/picoclaw/pkg/session"
 	"github.com/sipeed/picoclaw/pkg/tools"
+	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
 type fakeChannel struct{ id string }
@@ -1761,6 +1762,157 @@ func (m *toolFeedbackProvider) GetDefaultModel() string {
 	return "heartbeat-tool-feedback-model"
 }
 
+type toolFeedbackReasoningProvider struct {
+	filePath string
+	calls    int
+}
+
+func (m *toolFeedbackReasoningProvider) Chat(
+	ctx context.Context,
+	messages []providers.Message,
+	tools []providers.ToolDefinition,
+	model string,
+	opts map[string]any,
+) (*providers.LLMResponse, error) {
+	m.calls++
+	if m.calls == 1 {
+		return &providers.LLMResponse{
+			ReasoningContent: "Read README.md first to confirm the context that needs to be changed.",
+			ToolCalls: []providers.ToolCall{{
+				ID:        "call_reasoning_read_file",
+				Type:      "function",
+				Name:      "read_file",
+				Arguments: map[string]any{"path": m.filePath},
+			}},
+		}, nil
+	}
+
+	return &providers.LLMResponse{
+		Content:   "DONE",
+		ToolCalls: []providers.ToolCall{},
+	}, nil
+}
+
+func (m *toolFeedbackReasoningProvider) GetDefaultModel() string {
+	return "tool-feedback-reasoning-model"
+}
+
+func TestToolFeedbackExplanationFromResponse_UsesCurrentContentFirst(t *testing.T) {
+	response := &providers.LLMResponse{
+		Content:          "Read README.md first",
+		ReasoningContent: "current reasoning fallback",
+	}
+	messages := []providers.Message{
+		{Role: "user", Content: "check file"},
+		{Role: "assistant", Content: "Previous turn explanation"},
+		{Role: "tool", Content: "tool output", ToolCallID: "call_1"},
+	}
+
+	got := toolFeedbackExplanationFromResponse(response, messages, 300)
+	if got != "Read README.md first" {
+		t.Fatalf("toolFeedbackExplanationFromResponse() = %q, want current content", got)
+	}
+}
+
+func TestToolFeedbackExplanationFromResponse_UsesExplicitToolCallExtraContent(t *testing.T) {
+	response := &providers.LLMResponse{
+		ToolCalls: []providers.ToolCall{{
+			ID:   "call_1",
+			Name: "read_file",
+			ExtraContent: &providers.ExtraContent{
+				ToolFeedbackExplanation: "Read README.md first to confirm the current project structure.",
+			},
+		}},
+	}
+	messages := []providers.Message{
+		{Role: "user", Content: "check file"},
+		{Role: "assistant", Content: ""},
+		{Role: "tool", Content: "tool output", ToolCallID: "call_1"},
+	}
+
+	got := toolFeedbackExplanationFromResponse(response, messages, 300)
+	if got != "Read README.md first to confirm the current project structure." {
+		t.Fatalf("toolFeedbackExplanationFromResponse() = %q, want explicit tool feedback explanation", got)
+	}
+}
+
+func TestToolFeedbackExplanationForToolCall_PrefersToolSpecificExtraContent(t *testing.T) {
+	response := &providers.LLMResponse{
+		Content: "Shared explanation",
+		ToolCalls: []providers.ToolCall{
+			{
+				ID:   "call_1",
+				Name: "read_file",
+				ExtraContent: &providers.ExtraContent{
+					ToolFeedbackExplanation: "Read README.md first.",
+				},
+			},
+			{
+				ID:   "call_2",
+				Name: "edit_file",
+				ExtraContent: &providers.ExtraContent{
+					ToolFeedbackExplanation: "Update config example after reading it.",
+				},
+			},
+		},
+	}
+
+	got1 := toolFeedbackExplanationForToolCall(response, response.ToolCalls[0], nil, 300)
+	got2 := toolFeedbackExplanationForToolCall(response, response.ToolCalls[1], nil, 300)
+	if got1 != "Read README.md first." {
+		t.Fatalf("toolFeedbackExplanationForToolCall() first = %q, want tool-specific explanation", got1)
+	}
+	if got2 != "Update config example after reading it." {
+		t.Fatalf("toolFeedbackExplanationForToolCall() second = %q, want tool-specific explanation", got2)
+	}
+}
+
+func TestToolFeedbackExplanationForToolCall_DoesNotReuseAnotherToolCallExplanation(t *testing.T) {
+	response := &providers.LLMResponse{
+		ToolCalls: []providers.ToolCall{
+			{
+				ID:   "call_1",
+				Name: "read_file",
+			},
+			{
+				ID:   "call_2",
+				Name: "edit_file",
+				ExtraContent: &providers.ExtraContent{
+					ToolFeedbackExplanation: "Update config example after reading it.",
+				},
+			},
+		},
+	}
+	messages := []providers.Message{
+		{Role: "user", Content: "inspect the config and update the example"},
+	}
+
+	got := toolFeedbackExplanationForToolCall(response, response.ToolCalls[0], messages, 300)
+	want := utils.ToolFeedbackContinuationHint + ": inspect the config and update the example"
+	if got != want {
+		t.Fatalf("toolFeedbackExplanationForToolCall() = %q, want %q", got, want)
+	}
+}
+
+func TestToolFeedbackExplanationFromResponse_DoesNotUseReasoningContent(t *testing.T) {
+	response := &providers.LLMResponse{
+		Content:          "",
+		ReasoningContent: "hidden reasoning should not be shown",
+	}
+	messages := []providers.Message{
+		{Role: "user", Content: "check file"},
+		{Role: "assistant", Content: "Previous turn explanation"},
+		{Role: "user", Content: "Inspect README.md and update the config example."},
+		{Role: "tool", Content: "tool output", ToolCallID: "call_1"},
+	}
+
+	got := toolFeedbackExplanationFromResponse(response, messages, 300)
+	want := utils.ToolFeedbackContinuationHint + ": Inspect README.md and update the config example."
+	if got != want {
+		t.Fatalf("toolFeedbackExplanationFromResponse() = %q, want latest user content fallback", got)
+	}
+}
+
 type picoInterleavedContentProvider struct {
 	calls int
 }
@@ -3728,7 +3880,16 @@ func TestProcessMessage_PublishesToolFeedbackWhenEnabled(t *testing.T) {
 			t.Fatalf("unexpected tool feedback context: %+v", outbound.Context)
 		}
 		if !strings.Contains(outbound.Content, "`read_file`") {
-			t.Fatalf("tool feedback content = %q, want read_file preview", outbound.Content)
+			t.Fatalf("tool feedback content = %q, want read_file summary", outbound.Content)
+		}
+		if !strings.Contains(outbound.Content, utils.ToolFeedbackContinuationHint) {
+			t.Fatalf("tool feedback content = %q, want continuation hint fallback", outbound.Content)
+		}
+		if !strings.Contains(outbound.Content, "check tool feedback") {
+			t.Fatalf("tool feedback content = %q, want current user intent fallback", outbound.Content)
+		}
+		if strings.Contains(outbound.Content, "Previous turn explanation") {
+			t.Fatalf("tool feedback content = %q, want no previous assistant fallback", outbound.Content)
 		}
 		if outbound.AgentID != "main" {
 			t.Fatalf("tool feedback agent_id = %q, want main", outbound.AgentID)
@@ -3744,6 +3905,130 @@ func TestProcessMessage_PublishesToolFeedbackWhenEnabled(t *testing.T) {
 	}
 }
 
+func TestProcessMessage_DoesNotLeakReasoningContentInToolFeedback(t *testing.T) {
+	tmpDir := t.TempDir()
+	heartbeatFile := filepath.Join(tmpDir, "tool-feedback-reasoning.txt")
+	if err := os.WriteFile(heartbeatFile, []byte("tool feedback task"), 0o644); err != nil {
+		t.Fatalf("WriteFile() error = %v", err)
+	}
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				ModelName:         "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+				ToolFeedback: config.ToolFeedbackConfig{
+					Enabled:       true,
+					MaxArgsLength: 300,
+				},
+			},
+		},
+		Tools: config.ToolsConfig{
+			ReadFile: config.ReadFileToolConfig{
+				Enabled: true,
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	provider := &toolFeedbackReasoningProvider{filePath: heartbeatFile}
+	al := NewAgentLoop(cfg, msgBus, provider)
+
+	response, err := al.processMessage(context.Background(), testInboundMessage(bus.InboundMessage{
+		Channel:  "telegram",
+		SenderID: "user-1",
+		ChatID:   "chat-1",
+		Content:  "check reasoning fallback",
+	}))
+	if err != nil {
+		t.Fatalf("processMessage() error = %v", err)
+	}
+	if response != "DONE" {
+		t.Fatalf("processMessage() response = %q, want %q", response, "DONE")
+	}
+
+	select {
+	case outbound := <-msgBus.OutboundChan():
+		if !strings.Contains(outbound.Content, "`read_file`") {
+			t.Fatalf("tool feedback content = %q, want read_file summary", outbound.Content)
+		}
+		if !strings.Contains(outbound.Content, utils.ToolFeedbackContinuationHint) {
+			t.Fatalf("tool feedback content = %q, want continuation hint fallback", outbound.Content)
+		}
+		if !strings.Contains(outbound.Content, "check reasoning fallback") {
+			t.Fatalf("tool feedback content = %q, want current user intent fallback", outbound.Content)
+		}
+		if strings.Contains(outbound.Content, "Read README.md first") {
+			t.Fatalf("tool feedback content = %q, should not leak hidden reasoning", outbound.Content)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("expected outbound tool feedback without leaking reasoning")
+	}
+}
+
+func TestProcessMessage_DoesNotPublishToolFeedbackForDiscordWhenDisabled(t *testing.T) {
+	assertToolFeedbackNotPublishedWhenDisabled(t, "discord")
+}
+
+func assertToolFeedbackNotPublishedWhenDisabled(t *testing.T, channel string) {
+	t.Helper()
+
+	tmpDir := t.TempDir()
+	heartbeatFile := filepath.Join(tmpDir, "tool-feedback-"+channel+".txt")
+	if err := os.WriteFile(heartbeatFile, []byte("tool feedback task"), 0o644); err != nil {
+		t.Fatalf("WriteFile() error = %v", err)
+	}
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				ModelName:         "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+			},
+		},
+		Tools: config.ToolsConfig{
+			ReadFile: config.ReadFileToolConfig{
+				Enabled: true,
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	provider := &toolFeedbackProvider{filePath: heartbeatFile}
+	al := NewAgentLoop(cfg, msgBus, provider)
+
+	response, err := al.processMessage(context.Background(), testInboundMessage(bus.InboundMessage{
+		Channel:  channel,
+		SenderID: "user-1",
+		ChatID:   "chat-1",
+		Content:  "check tool feedback",
+	}))
+	if err != nil {
+		t.Fatalf("processMessage() error = %v", err)
+	}
+	if response != "HEARTBEAT_OK" {
+		t.Fatalf("processMessage() response = %q, want %q", response, "HEARTBEAT_OK")
+	}
+
+	select {
+	case outbound := <-msgBus.OutboundChan():
+		t.Fatalf("expected no outbound tool feedback for %s when disabled, got %+v", channel, outbound)
+	case <-time.After(200 * time.Millisecond):
+	}
+}
+
+func TestProcessMessage_DoesNotPublishToolFeedbackForTelegramWhenDisabled(t *testing.T) {
+	assertToolFeedbackNotPublishedWhenDisabled(t, "telegram")
+}
+
+func TestProcessMessage_DoesNotPublishToolFeedbackForFeishuWhenDisabled(t *testing.T) {
+	assertToolFeedbackNotPublishedWhenDisabled(t, "feishu")
+}
+
 func TestProcessMessage_MessageToolPublishesOutboundWithTurnMetadata(t *testing.T) {
 	cfg := config.DefaultConfig()
 	cfg.Agents.Defaults.Workspace = t.TempDir()
@@ -3918,6 +4203,85 @@ func TestRunAgentLoop_PicoSkipsInterimPublishWhenNotAllowed(t *testing.T) {
 	}
 }
 
+func TestRun_PicoToolFeedbackSuppressesDuplicateInterimAssistantContent(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				ModelName:         "test-model",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+				ToolFeedback: config.ToolFeedbackConfig{
+					Enabled: true,
+				},
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	provider := &picoInterleavedContentProvider{}
+	al := NewAgentLoop(cfg, msgBus, provider)
+
+	agent := al.GetRegistry().GetDefaultAgent()
+	if agent == nil {
+		t.Fatal("expected default agent")
+	}
+	agent.Tools.Register(&toolLimitTestTool{})
+
+	runCtx, runCancel := context.WithCancel(context.Background())
+	defer runCancel()
+
+	runDone := make(chan error, 1)
+	go func() {
+		runDone <- al.Run(runCtx)
+	}()
+
+	if err := msgBus.PublishInbound(context.Background(), bus.InboundMessage{
+		Channel:  "pico",
+		SenderID: "user-1",
+		ChatID:   "session-1",
+		Content:  "run with tools",
+	}); err != nil {
+		t.Fatalf("PublishInbound() error = %v", err)
+	}
+
+	outputs := make([]string, 0, 2)
+	deadline := time.After(2 * time.Second)
+	for len(outputs) < 2 {
+		select {
+		case outbound := <-msgBus.OutboundChan():
+			outputs = append(outputs, outbound.Content)
+		case <-deadline:
+			t.Fatalf("timed out waiting for pico outputs, got %v", outputs)
+		}
+	}
+
+	if outputs[0] != "🔧 `tool_limit_test_tool`\nintermediate model text" {
+		t.Fatalf("first outbound content = %q, want tool feedback summary", outputs[0])
+	}
+	if outputs[1] != "final model text" {
+		t.Fatalf("second outbound content = %q, want %q", outputs[1], "final model text")
+	}
+
+	runCancel()
+	select {
+	case err := <-runDone:
+		if err != nil {
+			t.Fatalf("Run() error = %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("timed out waiting for Run() to exit")
+	}
+
+	select {
+	case outbound := <-msgBus.OutboundChan():
+		t.Fatalf("unexpected extra pico output after tool feedback + final reply: %+v", outbound)
+	case <-time.After(200 * time.Millisecond):
+	}
+}
+
 func TestResolveMediaRefs_ResolvesToBase64(t *testing.T) {
 	store := media.NewFileMediaStore()
 	dir := t.TempDir()

pkg/agent/agent_utils.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/commands"
+	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/session"
 	"github.com/sipeed/picoclaw/pkg/utils"
@@ -84,6 +85,98 @@ func outboundMessageForTurn(ts *turnState, content string) bus.OutboundMessage {
 	}
 }
 
+func outboundMessageForTurnWithKind(ts *turnState, content, kind string) bus.OutboundMessage {
+	msg := outboundMessageForTurn(ts, content)
+	if strings.TrimSpace(kind) == "" {
+		return msg
+	}
+	if msg.Context.Raw == nil {
+		msg.Context.Raw = make(map[string]string, 1)
+	}
+	msg.Context.Raw[metadataKeyMessageKind] = kind
+	return msg
+}
+
+func latestUserContent(messages []providers.Message) string {
+	for i := len(messages) - 1; i >= 0; i-- {
+		msg := messages[i]
+		if msg.Role != "user" {
+			continue
+		}
+		if content := strings.TrimSpace(msg.Content); content != "" {
+			return content
+		}
+	}
+	return ""
+}
+
+func toolFeedbackExplanationFromResponse(
+	response *providers.LLMResponse,
+	messages []providers.Message,
+	maxLen int,
+) string {
+	if response == nil {
+		return ""
+	}
+	explanation := strings.TrimSpace(response.Content)
+	if explanation == "" {
+		explanation = toolFeedbackExplanationFromToolCalls(response.ToolCalls)
+	}
+	if explanation == "" {
+		explanation = toolFeedbackExplanationFromMessages(messages)
+	}
+	return utils.Truncate(explanation, maxLen)
+}
+
+func toolFeedbackExplanationFromToolCalls(toolCalls []providers.ToolCall) string {
+	for _, tc := range toolCalls {
+		if tc.ExtraContent == nil {
+			continue
+		}
+		if explanation := strings.TrimSpace(tc.ExtraContent.ToolFeedbackExplanation); explanation != "" {
+			return explanation
+		}
+	}
+	return ""
+}
+
+func toolFeedbackExplanationForToolCall(
+	response *providers.LLMResponse,
+	toolCall providers.ToolCall,
+	messages []providers.Message,
+	maxLen int,
+) string {
+	if toolCall.ExtraContent != nil {
+		if explanation := strings.TrimSpace(toolCall.ExtraContent.ToolFeedbackExplanation); explanation != "" {
+			return utils.Truncate(explanation, maxLen)
+		}
+	}
+	if response == nil {
+		return utils.Truncate(toolFeedbackExplanationFromMessages(messages), maxLen)
+	}
+
+	explanation := strings.TrimSpace(response.Content)
+	if explanation == "" {
+		explanation = toolFeedbackExplanationFromMessages(messages)
+	}
+	return utils.Truncate(explanation, maxLen)
+}
+
+func toolFeedbackExplanationFromMessages(messages []providers.Message) string {
+	explanation := latestUserContent(messages)
+	if explanation != "" {
+		return utils.ToolFeedbackContinuationHint + ": " + explanation
+	}
+	return ""
+}
+
+func shouldPublishToolFeedback(cfg *config.Config, ts *turnState) bool {
+	if ts == nil || ts.channel == "" || ts.opts.SuppressToolFeedback {
+		return false
+	}
+	return cfg != nil && cfg.Agents.Defaults.IsToolFeedbackEnabled()
+}
+
 func cloneEventArguments(args map[string]any) map[string]any {
 	if len(args) == 0 {
 		return nil

pkg/agent/hooks_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"os"
+	"strings"
 	"sync"
 	"testing"
 	"time"
@@ -403,6 +404,24 @@ func (h *toolRewriteHook) AfterTool(
 	return next, HookDecision{Action: HookActionModify}, nil
 }
 
+type toolRenameHook struct{}
+
+func (h *toolRenameHook) BeforeTool(
+	ctx context.Context,
+	call *ToolCallHookRequest,
+) (*ToolCallHookRequest, HookDecision, error) {
+	next := call.Clone()
+	next.Tool = "echo_text_rewritten"
+	return next, HookDecision{Action: HookActionModify}, nil
+}
+
+func (h *toolRenameHook) AfterTool(
+	ctx context.Context,
+	result *ToolResultHookResponse,
+) (*ToolResultHookResponse, HookDecision, error) {
+	return result.Clone(), HookDecision{Action: HookActionContinue}, nil
+}
+
 func TestAgentLoop_Hooks_ToolInterceptorCanRewrite(t *testing.T) {
 	provider := &toolHookProvider{}
 	al, agent, cleanup := newHookTestLoop(t, provider)
@@ -430,6 +449,75 @@ func TestAgentLoop_Hooks_ToolInterceptorCanRewrite(t *testing.T) {
 	}
 }
 
+type echoTextRewrittenTool struct{}
+
+func (t *echoTextRewrittenTool) Name() string {
+	return "echo_text_rewritten"
+}
+
+func (t *echoTextRewrittenTool) Description() string {
+	return "echo a rewritten text argument"
+}
+
+func (t *echoTextRewrittenTool) Parameters() map[string]any {
+	return map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"text": map[string]any{
+				"type": "string",
+			},
+		},
+	}
+}
+
+func (t *echoTextRewrittenTool) Execute(ctx context.Context, args map[string]any) *tools.ToolResult {
+	text, _ := args["text"].(string)
+	return tools.SilentResult("rewritten:" + text)
+}
+
+func TestAgentLoop_Hooks_ToolFeedbackUsesRewrittenToolName(t *testing.T) {
+	provider := &toolHookProvider{}
+	al, agent, cleanup := newHookTestLoop(t, provider)
+	defer cleanup()
+
+	al.cfg.Agents.Defaults.ToolFeedback.Enabled = true
+	al.RegisterTool(&echoTextTool{})
+	al.RegisterTool(&echoTextRewrittenTool{})
+	if err := al.MountHook(NamedHook("tool-rename", &toolRenameHook{})); err != nil {
+		t.Fatalf("MountHook failed: %v", err)
+	}
+
+	_, err := al.runAgentLoop(context.Background(), agent, processOptions{
+		SessionKey:      "session-1",
+		Channel:         "cli",
+		ChatID:          "direct",
+		UserMessage:     "run tool",
+		DefaultResponse: defaultResponse,
+		EnableSummary:   false,
+		SendResponse:    false,
+	})
+	if err != nil {
+		t.Fatalf("runAgentLoop failed: %v", err)
+	}
+
+	msgBus, ok := al.bus.(*bus.MessageBus)
+	if !ok {
+		t.Fatalf("expected concrete MessageBus, got %T", al.bus)
+	}
+
+	select {
+	case outbound := <-msgBus.OutboundChan():
+		if !strings.Contains(outbound.Content, "`echo_text_rewritten`") {
+			t.Fatalf("tool feedback content = %q, want rewritten tool name", outbound.Content)
+		}
+		if strings.Contains(outbound.Content, "`echo_text`") {
+			t.Fatalf("tool feedback content = %q, want no original tool name", outbound.Content)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("expected outbound tool feedback")
+	}
+}
+
 type denyApprovalHook struct{}
 
 func (h *denyApprovalHook) ApproveTool(ctx context.Context, req *ToolApprovalRequest) (ApprovalDecision, error) {
@@ -804,6 +892,77 @@ func TestAgentLoop_HookRespond_BusFallback(t *testing.T) {
 	}
 }
 
+func TestAgentLoop_HookRespond_ResponseHandledMediaPreservesOutboundContext(t *testing.T) {
+	provider := &multiToolProvider{
+		toolCalls: []providers.ToolCall{
+			{ID: "call-1", Name: "media_tool", Arguments: map[string]any{}},
+		},
+		finalContent: "done",
+	}
+	al, agent, cleanup := newHookTestLoop(t, provider)
+	defer cleanup()
+
+	hook := &respondWithMediaHook{
+		respondTools:    map[string]bool{"media_tool": true},
+		media:           []string{"media://test/image.png"},
+		responseHandled: true,
+		forLLM:          "media sent successfully",
+	}
+	if err := al.MountHook(NamedHook("media-hook", hook)); err != nil {
+		t.Fatalf("MountHook failed: %v", err)
+	}
+
+	telegramChannel := &fakeMediaChannel{fakeChannel: fakeChannel{id: "rid-telegram"}}
+	al.channelManager = newStartedTestChannelManager(t,
+		al.bus.(*bus.MessageBus), al.mediaStore, "telegram", telegramChannel)
+
+	_, err := al.runAgentLoop(context.Background(), agent, processOptions{
+		Dispatch: DispatchRequest{
+			SessionKey: "session-topic-media",
+			SessionScope: &session.SessionScope{
+				Version:    session.ScopeVersionV1,
+				AgentID:    agent.ID,
+				Channel:    "telegram",
+				Dimensions: []string{"chat"},
+				Values: map[string]string{
+					"chat": "forum:-100123/42",
+				},
+			},
+			InboundContext: &bus.InboundContext{
+				Channel:  "telegram",
+				ChatID:   "-100123",
+				TopicID:  "42",
+				ChatType: "group",
+				SenderID: "user1",
+			},
+			UserMessage: "send media",
+		},
+		DefaultResponse: defaultResponse,
+		EnableSummary:   false,
+		SendResponse:    false,
+	})
+	if err != nil {
+		t.Fatalf("runAgentLoop failed: %v", err)
+	}
+
+	if len(telegramChannel.sentMedia) != 1 {
+		t.Fatalf("expected exactly 1 sent media message, got %d", len(telegramChannel.sentMedia))
+	}
+	sent := telegramChannel.sentMedia[0]
+	if sent.Context.Channel != "telegram" || sent.Context.ChatID != "-100123" || sent.Context.TopicID != "42" {
+		t.Fatalf("unexpected media context: %+v", sent.Context)
+	}
+	if sent.AgentID != agent.ID {
+		t.Fatalf("sent media agent_id = %q, want %q", sent.AgentID, agent.ID)
+	}
+	if sent.SessionKey != "session-topic-media" {
+		t.Fatalf("sent media session_key = %q, want session-topic-media", sent.SessionKey)
+	}
+	if sent.Scope == nil || sent.Scope.Values["chat"] != "forum:-100123/42" {
+		t.Fatalf("unexpected sent media scope: %+v", sent.Scope)
+	}
+}
+
 type multiToolProvider struct {
 	mu           sync.Mutex
 	callCount    int

pkg/agent/pipeline_execute.go

@@ -80,21 +80,16 @@ toolLoop:
 						},
 					)
 
-					if al.cfg.Agents.Defaults.IsToolFeedbackEnabled() &&
+					if shouldPublishToolFeedback(al.cfg, ts) {
-						ts.channel != "" &&
+						toolFeedbackExplanation := toolFeedbackExplanationForToolCall(
-						!ts.opts.SuppressToolFeedback {
+							exec.response,
-						argsJSON, _ := json.Marshal(toolArgs)
+							tc,
-						feedbackPreview := utils.Truncate(
+							messages,
-							string(argsJSON),
 							al.cfg.Agents.Defaults.GetToolFeedbackMaxArgsLength(),
 						)
-						feedbackMsg := utils.FormatToolFeedbackMessage(toolName, feedbackPreview)
+						feedbackMsg := utils.FormatToolFeedbackMessage(toolName, toolFeedbackExplanation)
 						fbCtx, fbCancel := context.WithTimeout(turnCtx, 3*time.Second)
-						_ = al.bus.PublishOutbound(fbCtx, bus.OutboundMessage{
+						_ = al.bus.PublishOutbound(fbCtx, outboundMessageForTurnWithKind(ts, feedbackMsg, messageKindToolFeedback))
-							Channel: ts.channel,
-							ChatID:  ts.chatID,
-							Content: feedbackMsg,
-						})
 						fbCancel()
 					}
 
@@ -131,6 +126,15 @@ toolLoop:
 						outboundMedia := bus.OutboundMediaMessage{
 							Channel: ts.channel,
 							ChatID:  ts.chatID,
+							Context: outboundContextFromInbound(
+								ts.opts.Dispatch.InboundContext,
+								ts.channel,
+								ts.chatID,
+								ts.opts.Dispatch.ReplyToMessageID(),
+							),
+							AgentID:    ts.agent.ID,
+							SessionKey: ts.sessionKey,
+							Scope:      outboundScopeFromSessionScope(ts.opts.Dispatch.SessionScope),
 							Parts:      parts,
 						}
 						if al.channelManager != nil && ts.channel != "" && !constants.IsInternalChannel(ts.channel) {
@@ -353,16 +357,16 @@ toolLoop:
 			},
 		)
 
-		if al.cfg.Agents.Defaults.IsToolFeedbackEnabled() &&
+		if shouldPublishToolFeedback(al.cfg, ts) {
-			ts.channel != "" &&
+			toolFeedbackExplanation := toolFeedbackExplanationForToolCall(
-			!ts.opts.SuppressToolFeedback {
+				exec.response,
-			feedbackPreview := utils.Truncate(
+				tc,
-				string(argsJSON),
+				messages,
 				al.cfg.Agents.Defaults.GetToolFeedbackMaxArgsLength(),
 			)
-			feedbackMsg := utils.FormatToolFeedbackMessage(tc.Name, feedbackPreview)
+			feedbackMsg := utils.FormatToolFeedbackMessage(toolName, toolFeedbackExplanation)
 			fbCtx, fbCancel := context.WithTimeout(turnCtx, 3*time.Second)
-			_ = al.bus.PublishOutbound(fbCtx, outboundMessageForTurn(ts, feedbackMsg))
+			_ = al.bus.PublishOutbound(fbCtx, outboundMessageForTurnWithKind(ts, feedbackMsg, messageKindToolFeedback))
 			fbCancel()
 		}
 

pkg/agent/pipeline_llm.go

@@ -424,7 +424,11 @@ func (p *Pipeline) CallLLM(
 	}
 	logger.DebugCF("agent", "LLM response", llmResponseFields)
 
-	if al.bus != nil && ts.channel == "pico" && len(exec.response.ToolCalls) > 0 && ts.opts.AllowInterimPicoPublish {
+	if al.bus != nil &&
+		ts.channel == "pico" &&
+		len(exec.response.ToolCalls) > 0 &&
+		ts.opts.AllowInterimPicoPublish &&
+		!shouldPublishToolFeedback(al.cfg, ts) {
 		if strings.TrimSpace(exec.response.Content) != "" {
 			outCtx, outCancel := context.WithTimeout(turnCtx, 3*time.Second)
 			publishErr := al.bus.PublishOutbound(outCtx, bus.OutboundMessage{
@@ -496,7 +500,19 @@ func (p *Pipeline) CallLLM(
 	}
 	for _, tc := range exec.normalizedToolCalls {
 		argumentsJSON, _ := json.Marshal(tc.Arguments)
+		toolFeedbackExplanation := toolFeedbackExplanationForToolCall(
+			exec.response,
+			tc,
+			exec.messages,
+			al.cfg.Agents.Defaults.GetToolFeedbackMaxArgsLength(),
+		)
 		extraContent := tc.ExtraContent
+		if strings.TrimSpace(toolFeedbackExplanation) != "" {
+			if extraContent == nil {
+				extraContent = &providers.ExtraContent{}
+			}
+			extraContent.ToolFeedbackExplanation = toolFeedbackExplanation
+		}
 		thoughtSignature := ""
 		if tc.Function != nil {
 			thoughtSignature = tc.Function.ThoughtSignature

pkg/agent/subturn_test.go

@@ -1650,6 +1650,38 @@ func TestGrandchildAbort_CascadingCancellation(t *testing.T) {
 	}
 }
 
+func TestNestedSubTurn_GracefulFinishSignalsDirectChildren(t *testing.T) {
+	parentCtx := context.Background()
+	parentTS := &turnState{
+		ctx:            parentCtx,
+		turnID:         "parent-graceful",
+		depth:          1,
+		pendingResults: make(chan *tools.ToolResult, 16),
+	}
+	parentTS.ctx, parentTS.cancelFunc = context.WithCancel(parentCtx)
+
+	childTS := &turnState{
+		ctx:             context.Background(),
+		turnID:          "child-graceful",
+		depth:           2,
+		parentTurnState: parentTS,
+		pendingResults:  make(chan *tools.ToolResult, 16),
+	}
+
+	if childTS.IsParentEnded() {
+		t.Fatal("IsParentEnded should be false before parent finishes")
+	}
+
+	parentTS.Finish(false)
+
+	if !parentTS.parentEnded.Load() {
+		t.Fatal("parentEnded should be true after graceful finish")
+	}
+	if !childTS.IsParentEnded() {
+		t.Fatal("nested child should observe parent graceful finish")
+	}
+}
+
 // TestSpawnDuringAbort_RaceCondition verifies behavior when trying to spawn
 // a sub-turn while the parent is being aborted.
 func TestSpawnDuringAbort_RaceCondition(t *testing.T) {

pkg/agent/turn_state.go

@@ -554,9 +554,9 @@ func (ts *turnState) Finish(isHardAbort bool) {
 		ts.mu.Unlock()
 	})
 
-	// If this is a graceful finish (not hard abort), signal to children
+	// Any graceful finish must signal direct children so nested SubTurns can
-	if !isHardAbort && ts.parentTurnState == nil {
+	// observe parent completion and decide whether to stop or continue.
-		// This is a root turn finishing gracefully
+	if !isHardAbort {
 		ts.parentEnded.Store(true)
 	}
 

pkg/channels/discord/discord.go

@@ -45,9 +45,12 @@ type DiscordChannel struct {
 	cancel     context.CancelFunc
 	typingMu   sync.Mutex
 	typingStop map[string]chan struct{} // chatID → stop signal
+	progress   *channels.ToolFeedbackAnimator
 	botUserID  string // stored for mention checking
 	bus        *bus.MessageBus
 	tts        tts.TTSProvider
+	playTTSFn  func(context.Context, *discordgo.VoiceConnection, string, uint64)
+	ttsVoiceFn func(string) (*discordgo.VoiceConnection, bool)
 	voiceMu    sync.RWMutex
 	voiceSSRC  map[string]map[uint32]string // guildID -> ssrc -> userID
 
@@ -84,7 +87,7 @@ func NewDiscordChannel(
 		channels.WithReasoningChannelID(bc.ReasoningChannelID),
 	)
 
-	return &DiscordChannel{
+	ch := &DiscordChannel{
 		BaseChannel: base,
 		bc:          bc,
 		session:     session,
@@ -93,7 +96,11 @@ func NewDiscordChannel(
 		typingStop:  make(map[string]chan struct{}),
 		bus:         bus,
 		voiceSSRC:   make(map[string]map[uint32]string),
-	}, nil
+	}
+	ch.playTTSFn = ch.playTTS
+	ch.ttsVoiceFn = ch.voiceConnectionForTTS
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
+	return ch, nil
 }
 
 func (c *DiscordChannel) Start(ctx context.Context) error {
@@ -142,6 +149,9 @@ func (c *DiscordChannel) Stop(ctx context.Context) error {
 	if c.cancel != nil {
 		c.cancel()
 	}
+	if c.progress != nil {
+		c.progress.StopAll()
+	}
 
 	if err := c.session.Close(); err != nil {
 		return fmt.Errorf("failed to close discord session: %w", err)
@@ -164,10 +174,54 @@ func (c *DiscordChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]s
 		return nil, nil
 	}
 
-	if c.tts != nil {
+	isToolFeedback := outboundMessageIsToolFeedback(msg)
-		if ch, err := c.session.State.Channel(channelID); err == nil && ch.GuildID != "" {
+	if isToolFeedback {
-			if vc, ok := c.session.VoiceConnections[ch.GuildID]; ok && vc != nil {
+		if msgID, handled, err := c.progress.Update(ctx, channelID, msg.Content); handled {
-				// Cancel any previous TTS playback
+			if err != nil {
+				return nil, err
+			}
+			return []string{msgID}, nil
+		}
+	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(channelID)
+	c.maybeStartTTS(channelID, msg.Content, isToolFeedback)
+	if !isToolFeedback {
+		if msgIDs, handled := c.FinalizeToolFeedbackMessage(ctx, msg); handled {
+			return msgIDs, nil
+		}
+	}
+
+	content := msg.Content
+	if isToolFeedback {
+		content = channels.InitialAnimatedToolFeedbackContent(msg.Content)
+	}
+	msgID, err := c.sendChunk(ctx, channelID, content, msg.ReplyToMessageID)
+	if err != nil {
+		return nil, err
+	}
+	if isToolFeedback {
+		c.RecordToolFeedbackMessage(channelID, msgID, msg.Content)
+	} else if hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, channelID, trackedMsgID)
+	}
+	return []string{msgID}, nil
+}
+
+func (c *DiscordChannel) maybeStartTTS(channelID, content string, isToolFeedback bool) {
+	if c.tts == nil || isToolFeedback {
+		return
+	}
+
+	voiceFn := c.ttsVoiceFn
+	if voiceFn == nil {
+		voiceFn = c.voiceConnectionForTTS
+	}
+	vc, ok := voiceFn(channelID)
+	if !ok || vc == nil {
+		return
+	}
+
+	// Cancel any previous TTS playback.
 	c.ttsMu.Lock()
 	if c.cancelTTS != nil {
 		c.cancelTTS()
@@ -176,18 +230,30 @@ func (c *DiscordChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]s
 	c.ttsPlayID++
 	playID := c.ttsPlayID
 	c.cancelTTS = ttsCancel
+	playFn := c.playTTSFn
 	c.ttsMu.Unlock()
 
-				go c.playTTS(ttsCtx, vc, msg.Content, playID)
+	if playFn == nil {
-			}
+		playFn = c.playTTS
 	}
+	go playFn(ttsCtx, vc, content, playID)
 }
 
-	msgID, err := c.sendChunk(ctx, channelID, msg.Content, msg.ReplyToMessageID)
+func (c *DiscordChannel) voiceConnectionForTTS(channelID string) (*discordgo.VoiceConnection, bool) {
-	if err != nil {
+	if c.session == nil || c.session.State == nil {
-		return nil, err
+		return nil, false
 	}
-	return []string{msgID}, nil
+
+	ch, err := c.session.State.Channel(channelID)
+	if err != nil || ch == nil || ch.GuildID == "" {
+		return nil, false
+	}
+
+	vc, ok := c.session.VoiceConnections[ch.GuildID]
+	if !ok || vc == nil {
+		return nil, false
+	}
+	return vc, true
 }
 
 // SendMedia implements the channels.MediaSender interface.
@@ -200,6 +266,7 @@ func (c *DiscordChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMes
 	if channelID == "" {
 		return nil, fmt.Errorf("channel ID is empty")
 	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(channelID)
 
 	store := c.GetMediaStore()
 	if store == nil {
@@ -281,6 +348,9 @@ func (c *DiscordChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMes
 		if r.err != nil {
 			return nil, fmt.Errorf("discord send media: %w", channels.ErrTemporary)
 		}
+		if hasTrackedMsg {
+			c.dismissTrackedToolFeedbackMessage(ctx, channelID, trackedMsgID)
+		}
 		return []string{r.id}, nil
 	case <-sendCtx.Done():
 		// Close all file readers
@@ -295,10 +365,15 @@ func (c *DiscordChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMes
 
 // EditMessage implements channels.MessageEditor.
 func (c *DiscordChannel) EditMessage(ctx context.Context, chatID string, messageID string, content string) error {
-	_, err := c.session.ChannelMessageEdit(chatID, messageID, content)
+	_, err := c.session.ChannelMessageEdit(chatID, messageID, content, discordgo.WithContext(ctx))
 	return err
 }
 
+// DeleteMessage implements channels.MessageDeleter.
+func (c *DiscordChannel) DeleteMessage(ctx context.Context, chatID string, messageID string) error {
+	return c.session.ChannelMessageDelete(chatID, messageID, discordgo.WithContext(ctx))
+}
+
 // SendPlaceholder implements channels.PlaceholderCapable.
 // It sends a placeholder message that will later be edited to the actual
 // response via EditMessage (channels.MessageEditor).
@@ -317,6 +392,81 @@ func (c *DiscordChannel) SendPlaceholder(ctx context.Context, chatID string) (st
 	return msg.ID, nil
 }
 
+func outboundMessageIsToolFeedback(msg bus.OutboundMessage) bool {
+	if len(msg.Context.Raw) == 0 {
+		return false
+	}
+	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), "tool_feedback")
+}
+
+func (c *DiscordChannel) currentToolFeedbackMessage(chatID string) (string, bool) {
+	if c.progress == nil {
+		return "", false
+	}
+	return c.progress.Current(chatID)
+}
+
+func (c *DiscordChannel) takeToolFeedbackMessage(chatID string) (string, string, bool) {
+	if c.progress == nil {
+		return "", "", false
+	}
+	return c.progress.Take(chatID)
+}
+
+func (c *DiscordChannel) RecordToolFeedbackMessage(chatID, messageID, content string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Record(chatID, messageID, content)
+}
+
+func (c *DiscordChannel) ClearToolFeedbackMessage(chatID string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Clear(chatID)
+}
+
+func (c *DiscordChannel) DismissToolFeedbackMessage(ctx context.Context, chatID string) {
+	msgID, ok := c.currentToolFeedbackMessage(chatID)
+	if !ok {
+		return
+	}
+	c.dismissTrackedToolFeedbackMessage(ctx, chatID, msgID)
+}
+
+func (c *DiscordChannel) dismissTrackedToolFeedbackMessage(ctx context.Context, chatID, messageID string) {
+	if strings.TrimSpace(chatID) == "" || strings.TrimSpace(messageID) == "" {
+		return
+	}
+	c.ClearToolFeedbackMessage(chatID)
+	_ = c.DeleteMessage(ctx, chatID, messageID)
+}
+
+func (c *DiscordChannel) finalizeTrackedToolFeedbackMessage(
+	ctx context.Context,
+	chatID string,
+	content string,
+	editFn func(context.Context, string, string, string) error,
+) ([]string, bool) {
+	msgID, baseContent, ok := c.takeToolFeedbackMessage(chatID)
+	if !ok || editFn == nil {
+		return nil, false
+	}
+	if err := editFn(ctx, chatID, msgID, content); err != nil {
+		c.RecordToolFeedbackMessage(chatID, msgID, baseContent)
+		return nil, false
+	}
+	return []string{msgID}, true
+}
+
+func (c *DiscordChannel) FinalizeToolFeedbackMessage(ctx context.Context, msg bus.OutboundMessage) ([]string, bool) {
+	if outboundMessageIsToolFeedback(msg) {
+		return nil, false
+	}
+	return c.finalizeTrackedToolFeedbackMessage(ctx, msg.ChatID, msg.Content, c.EditMessage)
+}
+
 func (c *DiscordChannel) sendChunk(ctx context.Context, channelID, content, replyToID string) (string, error) {
 	// Use the passed ctx for timeout control
 	sendCtx, cancel := context.WithTimeout(ctx, sendTimeout)

pkg/channels/discord/discord_test.go

@@ -1,13 +1,37 @@
 package discord
 
 import (
+	"context"
+	"io"
 	"net/http"
+	"net/http/httptest"
 	"net/url"
+	"reflect"
+	"sync"
 	"testing"
+	"time"
 
 	"github.com/bwmarrin/discordgo"
+
+	"github.com/sipeed/picoclaw/pkg/audio/tts"
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/channels"
 )
 
+type stubTTSProvider struct{}
+
+func (stubTTSProvider) Name() string { return "stub-tts" }
+
+func (stubTTSProvider) Synthesize(context.Context, string) (io.ReadCloser, error) {
+	return io.NopCloser(&noopReader{}), nil
+}
+
+type noopReader struct{}
+
+func (*noopReader) Read(p []byte) (int, error) {
+	return 0, io.EOF
+}
+
 func TestApplyDiscordProxy_CustomProxy(t *testing.T) {
 	session, err := discordgo.New("Bot test-token")
 	if err != nil {
@@ -89,3 +113,224 @@ func TestApplyDiscordProxy_InvalidProxyURL(t *testing.T) {
 		t.Fatal("applyDiscordProxy() expected error for invalid proxy URL, got nil")
 	}
 }
+
+func TestSend_NonToolFeedbackDeletesTrackedProgressMessage(t *testing.T) {
+	var (
+		mu       sync.Mutex
+		requests []string
+	)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		requests = append(requests, r.Method+" "+r.URL.Path)
+		mu.Unlock()
+
+		switch {
+		case r.Method == http.MethodPatch && r.URL.Path == "/channels/chat-1/messages/prog-1":
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = io.WriteString(w, `{"id":"prog-1"}`)
+		default:
+			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
+		}
+	}))
+	defer server.Close()
+
+	origChannels := discordgo.EndpointChannels
+	discordgo.EndpointChannels = server.URL + "/channels/"
+	defer func() {
+		discordgo.EndpointChannels = origChannels
+	}()
+
+	session, err := discordgo.New("Bot test-token")
+	if err != nil {
+		t.Fatalf("discordgo.New() error: %v", err)
+	}
+	session.Client = server.Client()
+
+	ch := &DiscordChannel{
+		BaseChannel: channels.NewBaseChannel("discord", nil, bus.NewMessageBus(), nil),
+		session:     session,
+		ctx:         context.Background(),
+		typingStop:  make(map[string]chan struct{}),
+		voiceSSRC:   make(map[string]map[uint32]string),
+	}
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
+	ch.SetRunning(true)
+	ch.RecordToolFeedbackMessage("chat-1", "prog-1", "🔧 `read_file`")
+
+	ids, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "chat-1",
+		Content: "final reply",
+		Context: bus.InboundContext{
+			Channel: "discord",
+			ChatID:  "chat-1",
+		},
+	})
+	if err != nil {
+		t.Fatalf("Send() error = %v", err)
+	}
+	if got, want := ids, []string{"prog-1"}; !reflect.DeepEqual(got, want) {
+		t.Fatalf("Send() ids = %v, want %v", got, want)
+	}
+	if _, ok := ch.currentToolFeedbackMessage("chat-1"); ok {
+		t.Fatal("expected tracked tool feedback message to be cleared")
+	}
+
+	mu.Lock()
+	defer mu.Unlock()
+	wantRequests := []string{
+		"PATCH /channels/chat-1/messages/prog-1",
+	}
+	if !reflect.DeepEqual(requests, wantRequests) {
+		t.Fatalf("requests = %v, want %v", requests, wantRequests)
+	}
+}
+
+func TestEditMessage_UsesContextCancellation(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		select {
+		case <-r.Context().Done():
+			return
+		case <-time.After(time.Second):
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = io.WriteString(w, `{"id":"msg-1"}`)
+		}
+	}))
+	defer server.Close()
+
+	origChannels := discordgo.EndpointChannels
+	discordgo.EndpointChannels = server.URL + "/channels/"
+	defer func() {
+		discordgo.EndpointChannels = origChannels
+	}()
+
+	session, err := discordgo.New("Bot test-token")
+	if err != nil {
+		t.Fatalf("discordgo.New() error: %v", err)
+	}
+	session.Client = server.Client()
+
+	ch := &DiscordChannel{
+		BaseChannel: channels.NewBaseChannel("discord", nil, bus.NewMessageBus(), nil),
+		session:     session,
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
+	defer cancel()
+
+	start := time.Now()
+	err = ch.EditMessage(ctx, "chat-1", "msg-1", "still running")
+	elapsed := time.Since(start)
+
+	if err == nil {
+		t.Fatal("expected EditMessage() to fail when context times out")
+	}
+	if elapsed >= 500*time.Millisecond {
+		t.Fatalf("EditMessage() ignored context timeout, elapsed=%v", elapsed)
+	}
+}
+
+func TestFinalizeTrackedToolFeedbackMessage_StopsTrackingBeforeEdit(t *testing.T) {
+	ch := &DiscordChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("chat-1", "msg-1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"chat-1",
+		"final reply",
+		func(_ context.Context, chatID, messageID, content string) error {
+			if _, ok := ch.currentToolFeedbackMessage(chatID); ok {
+				t.Fatal("expected tracked tool feedback to be stopped before edit")
+			}
+			if chatID != "chat-1" || messageID != "msg-1" || content != "final reply" {
+				t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+			}
+			return nil
+		},
+	)
+	if !handled {
+		t.Fatal("expected finalizeTrackedToolFeedbackMessage to handle tracked message")
+	}
+	if got, want := msgIDs, []string{"msg-1"}; !reflect.DeepEqual(got, want) {
+		t.Fatalf("finalizeTrackedToolFeedbackMessage() ids = %v, want %v", got, want)
+	}
+}
+
+func TestSend_NonToolFeedbackFinalizerStillStartsTTS(t *testing.T) {
+	var (
+		mu       sync.Mutex
+		requests []string
+	)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		requests = append(requests, r.Method+" "+r.URL.Path)
+		mu.Unlock()
+
+		switch {
+		case r.Method == http.MethodPatch && r.URL.Path == "/channels/chat-1/messages/prog-1":
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = io.WriteString(w, `{"id":"prog-1"}`)
+		default:
+			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
+		}
+	}))
+	defer server.Close()
+
+	origChannels := discordgo.EndpointChannels
+	discordgo.EndpointChannels = server.URL + "/channels/"
+	defer func() {
+		discordgo.EndpointChannels = origChannels
+	}()
+
+	session, err := discordgo.New("Bot test-token")
+	if err != nil {
+		t.Fatalf("discordgo.New() error: %v", err)
+	}
+	session.Client = server.Client()
+
+	ttsStarted := make(chan string, 1)
+	ch := &DiscordChannel{
+		BaseChannel: channels.NewBaseChannel("discord", nil, bus.NewMessageBus(), nil),
+		session:     session,
+		ctx:         context.Background(),
+		typingStop:  make(map[string]chan struct{}),
+		voiceSSRC:   make(map[string]map[uint32]string),
+		tts:         tts.TTSProvider(stubTTSProvider{}),
+	}
+	ch.ttsVoiceFn = func(string) (*discordgo.VoiceConnection, bool) {
+		return &discordgo.VoiceConnection{}, true
+	}
+	ch.playTTSFn = func(_ context.Context, _ *discordgo.VoiceConnection, text string, _ uint64) {
+		ttsStarted <- text
+	}
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
+	ch.SetRunning(true)
+	ch.RecordToolFeedbackMessage("chat-1", "prog-1", "🔧 `read_file`")
+
+	ids, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "chat-1",
+		Content: "final reply",
+		Context: bus.InboundContext{
+			Channel: "discord",
+			ChatID:  "chat-1",
+		},
+	})
+	if err != nil {
+		t.Fatalf("Send() error = %v", err)
+	}
+	if got, want := ids, []string{"prog-1"}; !reflect.DeepEqual(got, want) {
+		t.Fatalf("Send() ids = %v, want %v", got, want)
+	}
+
+	select {
+	case got := <-ttsStarted:
+		if got != "final reply" {
+			t.Fatalf("TTS content = %q, want final reply", got)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("expected TTS to start for finalized tracked tool feedback reply")
+	}
+}

pkg/channels/feishu/feishu_64.go

@@ -49,6 +49,9 @@ type FeishuChannel struct {
 
 	mu     sync.Mutex
 	cancel context.CancelFunc
+
+	progress        *channels.ToolFeedbackAnimator
+	deleteMessageFn func(context.Context, string, string) error
 }
 
 type cachedMessage struct {
@@ -74,6 +77,8 @@ func NewFeishuChannel(bc *config.Channel, cfg *config.FeishuSettings, bus *bus.M
 		tokenCache:  tc,
 		client:      lark.NewClient(cfg.AppID, cfg.AppSecret.String(), opts...),
 	}
+	ch.deleteMessageFn = ch.deleteMessageAPI
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
 	ch.SetOwner(ch)
 	return ch, nil
 }
@@ -132,6 +137,9 @@ func (c *FeishuChannel) Stop(ctx context.Context) error {
 	}
 	c.wsClient = nil
 	c.mu.Unlock()
+	if c.progress != nil {
+		c.progress.StopAll()
+	}
 
 	c.SetRunning(false)
 	logger.InfoC("feishu", "Feishu channel stopped")
@@ -149,17 +157,55 @@ func (c *FeishuChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]st
 		return nil, fmt.Errorf("chat ID is empty: %w", channels.ErrSendFailed)
 	}
 
+	isToolFeedback := outboundMessageIsToolFeedback(msg)
+	if isToolFeedback {
+		if msgID, handled, err := c.progress.Update(ctx, msg.ChatID, msg.Content); handled {
+			if err != nil {
+				// Feishu can fall back to plain text for a previous progress
+				// message, and those messages cannot be patched through the card
+				// edit API. Drop the stale tracker and recreate the progress
+				// message so later tool feedback is not blocked.
+				c.resetTrackedToolFeedbackAfterEditFailure(ctx, msg.ChatID)
+			} else {
+				return []string{msgID}, nil
+			}
+		}
+	} else {
+		if msgIDs, handled := c.FinalizeToolFeedbackMessage(ctx, msg); handled {
+			return msgIDs, nil
+		}
+	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(msg.ChatID)
+
 	// Build interactive card with markdown content
-	cardContent, err := buildMarkdownCard(msg.Content)
+	sendContent := msg.Content
+	if isToolFeedback {
+		sendContent = channels.InitialAnimatedToolFeedbackContent(msg.Content)
+	}
+	cardContent, err := buildMarkdownCard(sendContent)
 	if err != nil {
 		// If card build fails, fall back to plain text
-		return nil, c.sendText(ctx, msg.ChatID, msg.Content)
+		msgID, sendErr := c.sendText(ctx, msg.ChatID, sendContent)
+		if sendErr != nil {
+			return nil, sendErr
+		}
+		if isToolFeedback {
+			c.RecordToolFeedbackMessage(msg.ChatID, msgID, msg.Content)
+		} else if hasTrackedMsg {
+			c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+		}
+		return []string{msgID}, nil
 	}
 
 	// First attempt: try sending as interactive card
-	err = c.sendCard(ctx, msg.ChatID, cardContent)
+	msgID, err := c.sendCard(ctx, msg.ChatID, cardContent)
 	if err == nil {
-		return nil, nil
+		if isToolFeedback {
+			c.RecordToolFeedbackMessage(msg.ChatID, msgID, msg.Content)
+		} else if hasTrackedMsg {
+			c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+		}
+		return []string{msgID}, nil
 	}
 
 	// Check if error is due to card table limit (error code 11310)
@@ -174,9 +220,14 @@ func (c *FeishuChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]st
 		})
 
 		// Second attempt: fall back to plain text message
-		textErr := c.sendText(ctx, msg.ChatID, msg.Content)
+		msgID, textErr := c.sendText(ctx, msg.ChatID, sendContent)
 		if textErr == nil {
-			return nil, nil
+			if isToolFeedback {
+				c.RecordToolFeedbackMessage(msg.ChatID, msgID, msg.Content)
+			} else if hasTrackedMsg {
+				c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+			}
+			return []string{msgID}, nil
 		}
 		// If text also fails, return the text error
 		return nil, textErr
@@ -210,6 +261,31 @@ func (c *FeishuChannel) EditMessage(ctx context.Context, chatID, messageID, cont
 	return nil
 }
 
+// DeleteMessage implements channels.MessageDeleter.
+func (c *FeishuChannel) DeleteMessage(ctx context.Context, chatID, messageID string) error {
+	deleteFn := c.deleteMessageFn
+	if deleteFn == nil {
+		deleteFn = c.deleteMessageAPI
+	}
+	return deleteFn(ctx, chatID, messageID)
+}
+
+func (c *FeishuChannel) deleteMessageAPI(ctx context.Context, chatID, messageID string) error {
+	req := larkim.NewDeleteMessageReqBuilder().
+		MessageId(messageID).
+		Build()
+
+	resp, err := c.client.Im.V1.Message.Delete(ctx, req)
+	if err != nil {
+		return fmt.Errorf("feishu delete: %w", err)
+	}
+	if !resp.Success() {
+		c.invalidateTokenOnAuthError(resp.Code)
+		return fmt.Errorf("feishu delete api error (code=%d msg=%s)", resp.Code, resp.Msg)
+	}
+	return nil
+}
+
 // SendPlaceholder implements channels.PlaceholderCapable.
 // Sends an interactive card with placeholder text and returns its message ID.
 func (c *FeishuChannel) SendPlaceholder(ctx context.Context, chatID string) (string, error) {
@@ -251,6 +327,93 @@ func (c *FeishuChannel) SendPlaceholder(ctx context.Context, chatID string) (str
 	return "", nil
 }
 
+func outboundMessageIsToolFeedback(msg bus.OutboundMessage) bool {
+	if len(msg.Context.Raw) == 0 {
+		return false
+	}
+	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), "tool_feedback")
+}
+
+func (c *FeishuChannel) currentToolFeedbackMessage(chatID string) (string, bool) {
+	if c.progress == nil {
+		return "", false
+	}
+	return c.progress.Current(chatID)
+}
+
+func (c *FeishuChannel) takeToolFeedbackMessage(chatID string) (string, string, bool) {
+	if c.progress == nil {
+		return "", "", false
+	}
+	return c.progress.Take(chatID)
+}
+
+func (c *FeishuChannel) RecordToolFeedbackMessage(chatID, messageID, content string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Record(chatID, messageID, content)
+}
+
+func (c *FeishuChannel) ClearToolFeedbackMessage(chatID string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Clear(chatID)
+}
+
+func (c *FeishuChannel) DismissToolFeedbackMessage(ctx context.Context, chatID string) {
+	msgID, ok := c.currentToolFeedbackMessage(chatID)
+	if !ok {
+		return
+	}
+	c.dismissTrackedToolFeedbackMessage(ctx, chatID, msgID)
+}
+
+func (c *FeishuChannel) resetTrackedToolFeedbackAfterEditFailure(ctx context.Context, chatID string) {
+	msgID, ok := c.currentToolFeedbackMessage(chatID)
+	if !ok {
+		return
+	}
+	c.dismissTrackedToolFeedbackMessage(ctx, chatID, msgID)
+}
+
+func (c *FeishuChannel) dismissTrackedToolFeedbackMessage(ctx context.Context, chatID, messageID string) {
+	if strings.TrimSpace(chatID) == "" || strings.TrimSpace(messageID) == "" {
+		return
+	}
+	c.ClearToolFeedbackMessage(chatID)
+	deleteFn := c.deleteMessageFn
+	if deleteFn == nil {
+		deleteFn = c.deleteMessageAPI
+	}
+	_ = deleteFn(ctx, chatID, messageID)
+}
+
+func (c *FeishuChannel) finalizeTrackedToolFeedbackMessage(
+	ctx context.Context,
+	chatID string,
+	content string,
+	editFn func(context.Context, string, string, string) error,
+) ([]string, bool) {
+	msgID, baseContent, ok := c.takeToolFeedbackMessage(chatID)
+	if !ok || editFn == nil {
+		return nil, false
+	}
+	if err := editFn(ctx, chatID, msgID, content); err != nil {
+		c.RecordToolFeedbackMessage(chatID, msgID, baseContent)
+		return nil, false
+	}
+	return []string{msgID}, true
+}
+
+func (c *FeishuChannel) FinalizeToolFeedbackMessage(ctx context.Context, msg bus.OutboundMessage) ([]string, bool) {
+	if outboundMessageIsToolFeedback(msg) {
+		return nil, false
+	}
+	return c.finalizeTrackedToolFeedbackMessage(ctx, msg.ChatID, msg.Content, c.EditMessage)
+}
+
 // ReactToMessage implements channels.ReactionCapable.
 // Adds a reaction (randomly chosen from config) and returns an undo function to remove it.
 func (c *FeishuChannel) ReactToMessage(ctx context.Context, chatID, messageID string) (func(), error) {
@@ -323,6 +486,7 @@ func (c *FeishuChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMess
 	if !c.IsRunning() {
 		return nil, channels.ErrNotRunning
 	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(msg.ChatID)
 
 	if msg.ChatID == "" {
 		return nil, fmt.Errorf("chat ID is empty: %w", channels.ErrSendFailed)
@@ -339,6 +503,10 @@ func (c *FeishuChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMess
 		}
 	}
 
+	if hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+	}
+
 	return nil, nil
 }
 
@@ -801,7 +969,7 @@ func appendMediaTags(content, messageType string, mediaRefs []string) string {
 }
 
 // sendCard sends an interactive card message to a chat.
-func (c *FeishuChannel) sendCard(ctx context.Context, chatID, cardContent string) error {
+func (c *FeishuChannel) sendCard(ctx context.Context, chatID, cardContent string) (string, error) {
 	req := larkim.NewCreateMessageReqBuilder().
 		ReceiveIdType(larkim.ReceiveIdTypeChatId).
 		Body(larkim.NewCreateMessageReqBodyBuilder().
@@ -813,23 +981,26 @@ func (c *FeishuChannel) sendCard(ctx context.Context, chatID, cardContent string
 
 	resp, err := c.client.Im.V1.Message.Create(ctx, req)
 	if err != nil {
-		return fmt.Errorf("feishu send card: %w", channels.ErrTemporary)
+		return "", fmt.Errorf("feishu send card: %w", channels.ErrTemporary)
 	}
 
 	if !resp.Success() {
 		c.invalidateTokenOnAuthError(resp.Code)
-		return fmt.Errorf("feishu api error (code=%d msg=%s): %w", resp.Code, resp.Msg, channels.ErrTemporary)
+		return "", fmt.Errorf("feishu api error (code=%d msg=%s): %w", resp.Code, resp.Msg, channels.ErrTemporary)
 	}
 
 	logger.DebugCF("feishu", "Feishu card message sent", map[string]any{
 		"chat_id": chatID,
 	})
 
-	return nil
+	if resp.Data != nil && resp.Data.MessageId != nil {
+		return *resp.Data.MessageId, nil
+	}
+	return "", nil
 }
 
 // sendText sends a plain text message to a chat (fallback when card fails).
-func (c *FeishuChannel) sendText(ctx context.Context, chatID, text string) error {
+func (c *FeishuChannel) sendText(ctx context.Context, chatID, text string) (string, error) {
 	content, _ := json.Marshal(map[string]string{"text": text})
 
 	req := larkim.NewCreateMessageReqBuilder().
@@ -843,18 +1014,21 @@ func (c *FeishuChannel) sendText(ctx context.Context, chatID, text string) error
 
 	resp, err := c.client.Im.V1.Message.Create(ctx, req)
 	if err != nil {
-		return fmt.Errorf("feishu send text: %w", channels.ErrTemporary)
+		return "", fmt.Errorf("feishu send text: %w", channels.ErrTemporary)
 	}
 
 	if !resp.Success() {
-		return fmt.Errorf("feishu text api error (code=%d msg=%s): %w", resp.Code, resp.Msg, channels.ErrTemporary)
+		return "", fmt.Errorf("feishu text api error (code=%d msg=%s): %w", resp.Code, resp.Msg, channels.ErrTemporary)
 	}
 
 	logger.DebugCF("feishu", "Feishu text message sent (fallback)", map[string]any{
 		"chat_id": chatID,
 	})
 
-	return nil
+	if resp.Data != nil && resp.Data.MessageId != nil {
+		return *resp.Data.MessageId, nil
+	}
+	return "", nil
 }
 
 // sendImage uploads an image and sends it as a message.

pkg/channels/feishu/feishu_64_test.go

@@ -3,9 +3,13 @@
 package feishu
 
 import (
+	"context"
+	"errors"
 	"testing"
 
 	larkim "github.com/larksuite/oapi-sdk-go/v3/service/im/v1"
+
+	"github.com/sipeed/picoclaw/pkg/channels"
 )
 
 func TestExtractContent(t *testing.T) {
@@ -279,3 +283,110 @@ func TestExtractFeishuSenderID(t *testing.T) {
 		})
 	}
 }
+
+func TestFinalizeTrackedToolFeedbackMessage_ClearAfterSuccessfulEdit(t *testing.T) {
+	ch := &FeishuChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("chat-1", "msg-1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"chat-1",
+		"final reply",
+		func(_ context.Context, chatID, messageID, content string) error {
+			if chatID != "chat-1" || messageID != "msg-1" || content != "final reply" {
+				t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+			}
+			return nil
+		},
+	)
+	if !handled {
+		t.Fatal("expected finalizeTrackedToolFeedbackMessage to handle tracked message")
+	}
+	if len(msgIDs) != 1 || msgIDs[0] != "msg-1" {
+		t.Fatalf("unexpected msgIDs: %v", msgIDs)
+	}
+	if _, ok := ch.currentToolFeedbackMessage("chat-1"); ok {
+		t.Fatal("expected tracked tool feedback to be cleared after successful edit")
+	}
+}
+
+func TestFinalizeTrackedToolFeedbackMessage_StopsTrackingBeforeEdit(t *testing.T) {
+	ch := &FeishuChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("chat-1", "msg-1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"chat-1",
+		"final reply",
+		func(_ context.Context, chatID, messageID, content string) error {
+			if _, ok := ch.currentToolFeedbackMessage(chatID); ok {
+				t.Fatal("expected tracked tool feedback to be stopped before edit")
+			}
+			if chatID != "chat-1" || messageID != "msg-1" || content != "final reply" {
+				t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+			}
+			return nil
+		},
+	)
+	if !handled {
+		t.Fatal("expected finalizeTrackedToolFeedbackMessage to handle tracked message")
+	}
+	if len(msgIDs) != 1 || msgIDs[0] != "msg-1" {
+		t.Fatalf("unexpected msgIDs: %v", msgIDs)
+	}
+}
+
+func TestFinalizeTrackedToolFeedbackMessage_EditFailureKeepsTrackedMessage(t *testing.T) {
+	ch := &FeishuChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("chat-1", "msg-1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"chat-1",
+		"final reply",
+		func(context.Context, string, string, string) error {
+			return errors.New("edit failed")
+		},
+	)
+	if handled {
+		t.Fatal("expected finalizeTrackedToolFeedbackMessage to report unhandled on edit failure")
+	}
+	if len(msgIDs) != 0 {
+		t.Fatalf("unexpected msgIDs: %v", msgIDs)
+	}
+	if msgID, ok := ch.currentToolFeedbackMessage("chat-1"); !ok || msgID != "msg-1" {
+		t.Fatalf("expected tracked tool feedback to remain after failed edit, got (%q, %v)", msgID, ok)
+	}
+}
+
+func TestResetTrackedToolFeedbackAfterEditFailure_DismissesTrackedMessage(t *testing.T) {
+	var (
+		deletedChatID string
+		deletedMsgID  string
+	)
+
+	ch := &FeishuChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+		deleteMessageFn: func(_ context.Context, chatID, messageID string) error {
+			deletedChatID = chatID
+			deletedMsgID = messageID
+			return nil
+		},
+	}
+	ch.RecordToolFeedbackMessage("chat-1", "msg-1", "🔧 `read_file`")
+
+	ch.resetTrackedToolFeedbackAfterEditFailure(context.Background(), "chat-1")
+
+	if deletedChatID != "chat-1" || deletedMsgID != "msg-1" {
+		t.Fatalf("unexpected delete target: chat=%q msg=%q", deletedChatID, deletedMsgID)
+	}
+	if _, ok := ch.currentToolFeedbackMessage("chat-1"); ok {
+		t.Fatal("expected tracked tool feedback to be cleared after edit failure reset")
+	}
+}

pkg/channels/manager.go

@@ -14,6 +14,7 @@ import (
 	"net"
 	"net/http"
 	"sort"
+	"strings"
 	"sync"
 	"time"
 
@@ -25,6 +26,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/health"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/media"
+	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
 const (
@@ -96,6 +98,23 @@ type Manager struct {
 	channelHashes map[string]string // channel name → config hash
 }
 
+type toolFeedbackMessageTracker interface {
+	RecordToolFeedbackMessage(chatID, messageID, content string)
+	ClearToolFeedbackMessage(chatID string)
+}
+
+type toolFeedbackMessageCleaner interface {
+	DismissToolFeedbackMessage(ctx context.Context, chatID string)
+}
+
+type toolFeedbackMessageTargetResolver interface {
+	ToolFeedbackMessageChatID(chatID string, outboundCtx *bus.InboundContext) string
+}
+
+type toolFeedbackMessageContentPreparer interface {
+	PrepareToolFeedbackMessageContent(content string) string
+}
+
 type asyncTask struct {
 	cancel context.CancelFunc
 }
@@ -108,6 +127,13 @@ func outboundMessageChatID(msg bus.OutboundMessage) string {
 	return msg.ChatID
 }
 
+func outboundMessageIsToolFeedback(msg bus.OutboundMessage) bool {
+	if len(msg.Context.Raw) == 0 {
+		return false
+	}
+	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), "tool_feedback")
+}
+
 func outboundMediaChannel(msg bus.OutboundMediaMessage) string {
 	return msg.Context.Channel
 }
@@ -116,6 +142,47 @@ func outboundMediaChatID(msg bus.OutboundMediaMessage) string {
 	return msg.ChatID
 }
 
+func trackedToolFeedbackMessageChatID(ch Channel, chatID string, outboundCtx *bus.InboundContext) string {
+	if resolver, ok := ch.(toolFeedbackMessageTargetResolver); ok {
+		if resolved := strings.TrimSpace(resolver.ToolFeedbackMessageChatID(chatID, outboundCtx)); resolved != "" {
+			return resolved
+		}
+	}
+	return strings.TrimSpace(chatID)
+}
+
+func dismissTrackedToolFeedbackMessage(
+	ctx context.Context,
+	ch Channel,
+	chatID string,
+	outboundCtx *bus.InboundContext,
+) {
+	trackedChatID := trackedToolFeedbackMessageChatID(ch, chatID, outboundCtx)
+	if trackedChatID == "" {
+		return
+	}
+	if cleaner, ok := ch.(toolFeedbackMessageCleaner); ok {
+		cleaner.DismissToolFeedbackMessage(ctx, trackedChatID)
+		return
+	}
+	if tracker, ok := ch.(toolFeedbackMessageTracker); ok {
+		tracker.ClearToolFeedbackMessage(trackedChatID)
+	}
+}
+
+func prepareToolFeedbackMessageContent(ch Channel, content string) string {
+	prepared := strings.TrimSpace(content)
+	if prepared == "" {
+		return ""
+	}
+	if preparer, ok := ch.(toolFeedbackMessageContentPreparer); ok {
+		if candidate := strings.TrimSpace(preparer.PrepareToolFeedbackMessageContent(prepared)); candidate != "" {
+			return candidate
+		}
+	}
+	return prepared
+}
+
 // RecordPlaceholder registers a placeholder message for later editing.
 // Implements PlaceholderRecorder.
 func (m *Manager) RecordPlaceholder(channel, chatID, placeholderID string) {
@@ -196,7 +263,19 @@ func (m *Manager) preSend(ctx context.Context, name string, msg bus.OutboundMess
 		}
 	}
 
-	// 3. If a stream already finalized this message, delete the placeholder and skip send
+	isToolFeedback := outboundMessageIsToolFeedback(msg)
+
+	// 3. If a stream already finalized this chat, stale tool feedback must be
+	// dropped without consuming the final-response marker. Streaming finalization
+	// bypasses the worker queue, so older queued feedback can arrive before the
+	// normal final outbound message that cleans up the marker and placeholder.
+	if isToolFeedback {
+		if _, loaded := m.streamActive.Load(key); loaded {
+			return nil, true
+		}
+	}
+
+	// 4. If a stream already finalized this message, delete the placeholder and skip send
 	if _, loaded := m.streamActive.LoadAndDelete(key); loaded {
 		if v, loaded := m.placeholders.LoadAndDelete(key); loaded {
 			if entry, ok := v.(placeholderEntry); ok && entry.id != "" {
@@ -208,14 +287,29 @@ func (m *Manager) preSend(ctx context.Context, name string, msg bus.OutboundMess
 				}
 			}
 		}
+		if !isToolFeedback {
+			dismissTrackedToolFeedbackMessage(ctx, ch, chatID, &msg.Context)
+		}
 		return nil, true
 	}
 
-	// 4. Try editing placeholder
+	// 5. Try editing placeholder
 	if v, loaded := m.placeholders.LoadAndDelete(key); loaded {
 		if entry, ok := v.(placeholderEntry); ok && entry.id != "" {
 			if editor, ok := ch.(MessageEditor); ok {
-				if err := editor.EditMessage(ctx, chatID, entry.id, msg.Content); err == nil {
+				content := msg.Content
+				trackedContent := msg.Content
+				if isToolFeedback {
+					trackedContent = prepareToolFeedbackMessageContent(ch, msg.Content)
+					content = InitialAnimatedToolFeedbackContent(trackedContent)
+				}
+				if err := editor.EditMessage(ctx, chatID, entry.id, content); err == nil {
+					trackedChatID := trackedToolFeedbackMessageChatID(ch, chatID, &msg.Context)
+					if tracker, ok := ch.(toolFeedbackMessageTracker); ok && isToolFeedback {
+						tracker.RecordToolFeedbackMessage(trackedChatID, entry.id, trackedContent)
+					} else if !isToolFeedback {
+						dismissTrackedToolFeedbackMessage(ctx, ch, chatID, &msg.Context)
+					}
 					return []string{entry.id}, true
 				}
 				// edit failed → fall through to normal Send
@@ -313,21 +407,34 @@ func (m *Manager) GetStreamer(ctx context.Context, channelName, chatID string) (
 	key := channelName + ":" + chatID
 	return &finalizeHookStreamer{
 		Streamer: streamer,
-		onFinalize: func() { m.streamActive.Store(key, true) },
+		onFinalize: func(finalizeCtx context.Context) {
+			dismissTrackedToolFeedbackMessage(
+				finalizeCtx,
+				ch,
+				chatID,
+				&bus.InboundContext{
+					Channel: channelName,
+					ChatID:  chatID,
+				},
+			)
+			m.streamActive.Store(key, true)
+		},
 	}, true
 }
 
 // finalizeHookStreamer wraps a Streamer to run a hook on Finalize.
 type finalizeHookStreamer struct {
 	Streamer
-	onFinalize func()
+	onFinalize func(context.Context)
 }
 
 func (s *finalizeHookStreamer) Finalize(ctx context.Context, content string) error {
 	if err := s.Streamer.Finalize(ctx, content); err != nil {
 		return err
 	}
-	s.onFinalize()
+	if s.onFinalize != nil {
+		s.onFinalize(ctx)
+	}
 	return nil
 }
 
@@ -769,18 +876,21 @@ func (m *Manager) runWorker(ctx context.Context, name string, w *channelWorker)
 			// Collect all message chunks to send
 			var chunks []string
 
-			// Step 1: Try marker-based splitting if enabled
+			// Step 1: Try marker-based splitting if enabled.
-			if m.config != nil && m.config.Agents.Defaults.SplitOnMarker {
+			// Tool feedback must stay a single message, so it skips marker splitting.
+			if m.config != nil && m.config.Agents.Defaults.SplitOnMarker && !outboundMessageIsToolFeedback(msg) {
 				if markerChunks := SplitByMarker(msg.Content); len(markerChunks) > 1 {
 					for _, chunk := range markerChunks {
-						chunks = append(chunks, splitByLength(chunk, maxLen)...)
+						chunkMsg := msg
+						chunkMsg.Content = chunk
+						chunks = append(chunks, splitOutboundMessageContent(chunkMsg, maxLen)...)
 					}
 				}
 			}
 
 			// Step 2: Fallback to length-based splitting if no chunks from marker
 			if len(chunks) == 0 {
-				chunks = splitByLength(msg.Content, maxLen)
+				chunks = splitOutboundMessageContent(msg, maxLen)
 			}
 
 			// Step 3: Send all chunks
@@ -795,12 +905,25 @@ func (m *Manager) runWorker(ctx context.Context, name string, w *channelWorker)
 	}
 }
 
-// splitByLength splits content by maxLen if needed, otherwise returns single chunk.
+// splitOutboundMessageContent splits regular outbound content by maxLen, but
-func splitByLength(content string, maxLen int) []string {
+// keeps tool feedback in a single message by truncating the explanation body.
-	if maxLen > 0 && len([]rune(content)) > maxLen {
+func splitOutboundMessageContent(msg bus.OutboundMessage, maxLen int) []string {
-		return SplitMessage(content, maxLen)
+	if maxLen > 0 {
+		if outboundMessageIsToolFeedback(msg) {
+			animationSafeLen := maxLen - MaxToolFeedbackAnimationFrameLength()
+			if animationSafeLen <= 0 {
+				animationSafeLen = maxLen
 			}
-	return []string{content}
+			if len([]rune(msg.Content)) > animationSafeLen {
+				return []string{utils.FitToolFeedbackMessage(msg.Content, animationSafeLen)}
+			}
+			return []string{msg.Content}
+		}
+		if len([]rune(msg.Content)) > maxLen {
+			return SplitMessage(msg.Content, maxLen)
+		}
+	}
+	return []string{msg.Content}
 }
 
 // sendWithRetry sends a message through the channel with rate limiting and
@@ -1264,13 +1387,16 @@ func (m *Manager) SendMessage(ctx context.Context, msg bus.OutboundMessage) erro
 	if mlp, ok := w.ch.(MessageLengthProvider); ok {
 		maxLen = mlp.MaxMessageLength()
 	}
-	if maxLen > 0 && len([]rune(msg.Content)) > maxLen {
+	if chunks := splitOutboundMessageContent(msg, maxLen); len(chunks) > 1 {
-		for _, chunk := range SplitMessage(msg.Content, maxLen) {
+		for _, chunk := range chunks {
 			chunkMsg := msg
 			chunkMsg.Content = chunk
 			m.sendWithRetry(ctx, channelName, w, chunkMsg)
 		}
 	} else {
+		if len(chunks) == 1 {
+			msg.Content = chunks[0]
+		}
 		m.sendWithRetry(ctx, channelName, w, msg)
 	}
 	return nil

pkg/channels/manager_test.go

@@ -13,6 +13,8 @@ import (
 	"golang.org/x/time/rate"
 
 	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/config"
+	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
 // mockChannel is a test double that delegates Send to a configurable function.
@@ -77,6 +79,7 @@ func (m *mockMediaChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaM
 type mockDeletingMediaChannel struct {
 	mockMediaChannel
 	deleteCalls     int
+	dismissedChatID string
 	lastDeleted     struct {
 		chatID    string
 		messageID string
@@ -94,6 +97,48 @@ func (m *mockDeletingMediaChannel) DeleteMessage(
 	return nil
 }
 
+func (m *mockDeletingMediaChannel) DismissToolFeedbackMessage(_ context.Context, chatID string) {
+	m.dismissedChatID = chatID
+}
+
+type mockStreamer struct {
+	finalizeFn func(context.Context, string) error
+}
+
+func (m *mockStreamer) Update(context.Context, string) error { return nil }
+
+func (m *mockStreamer) Finalize(ctx context.Context, content string) error {
+	if m.finalizeFn != nil {
+		return m.finalizeFn(ctx, content)
+	}
+	return nil
+}
+
+func (m *mockStreamer) Cancel(context.Context) {}
+
+type mockStreamingChannel struct {
+	mockMessageEditor
+	streamer        Streamer
+	resolveChatIDFn func(chatID string, outboundCtx *bus.InboundContext) string
+}
+
+func (m *mockStreamingChannel) BeginStream(context.Context, string) (Streamer, error) {
+	if m.streamer == nil {
+		return nil, errors.New("missing streamer")
+	}
+	return m.streamer, nil
+}
+
+func (m *mockStreamingChannel) ToolFeedbackMessageChatID(
+	chatID string,
+	outboundCtx *bus.InboundContext,
+) string {
+	if m.resolveChatIDFn != nil {
+		return m.resolveChatIDFn(chatID, outboundCtx)
+	}
+	return chatID
+}
+
 // newTestManager creates a minimal Manager suitable for unit tests.
 func newTestManager() *Manager {
 	return &Manager{
@@ -716,12 +761,71 @@ func TestSendWithRetry_ExponentialBackoff(t *testing.T) {
 type mockMessageEditor struct {
 	mockChannel
 	editFn            func(ctx context.Context, chatID, messageID, content string) error
+	finalizeFn        func(ctx context.Context, msg bus.OutboundMessage) ([]string, bool)
+	finalizeCalled    bool
+	recordedChatID    string
+	recordedMessageID string
+	recordedContent   string
+	clearedChatID     string
+	dismissedChatID   string
 }
 
 func (m *mockMessageEditor) EditMessage(ctx context.Context, chatID, messageID, content string) error {
 	return m.editFn(ctx, chatID, messageID, content)
 }
 
+func (m *mockMessageEditor) RecordToolFeedbackMessage(chatID, messageID, content string) {
+	m.recordedChatID = chatID
+	m.recordedMessageID = messageID
+	m.recordedContent = content
+}
+
+func (m *mockMessageEditor) ClearToolFeedbackMessage(chatID string) {
+	m.clearedChatID = chatID
+}
+
+func (m *mockMessageEditor) DismissToolFeedbackMessage(_ context.Context, chatID string) {
+	m.dismissedChatID = chatID
+}
+
+func (m *mockMessageEditor) FinalizeToolFeedbackMessage(
+	ctx context.Context,
+	msg bus.OutboundMessage,
+) ([]string, bool) {
+	m.finalizeCalled = true
+	if m.finalizeFn == nil {
+		return nil, false
+	}
+	return m.finalizeFn(ctx, msg)
+}
+
+type mockResolvedToolFeedbackEditor struct {
+	mockMessageEditor
+	resolveChatIDFn func(chatID string, outboundCtx *bus.InboundContext) string
+}
+
+func (m *mockResolvedToolFeedbackEditor) ToolFeedbackMessageChatID(
+	chatID string,
+	outboundCtx *bus.InboundContext,
+) string {
+	if m.resolveChatIDFn != nil {
+		return m.resolveChatIDFn(chatID, outboundCtx)
+	}
+	return chatID
+}
+
+type mockPreparedToolFeedbackEditor struct {
+	mockMessageEditor
+	prepareFn func(content string) string
+}
+
+func (m *mockPreparedToolFeedbackEditor) PrepareToolFeedbackMessageContent(content string) string {
+	if m.prepareFn != nil {
+		return m.prepareFn(content)
+	}
+	return content
+}
+
 func TestPreSend_PlaceholderEditSuccess(t *testing.T) {
 	m := newTestManager()
 	var sendCalled bool
@@ -766,6 +870,539 @@ func TestPreSend_PlaceholderEditSuccess(t *testing.T) {
 	}
 }
 
+func TestPreSend_ToolFeedbackPlaceholderEditRecordsTrackedMessage(t *testing.T) {
+	m := newTestManager()
+
+	ch := &mockMessageEditor{
+		editFn: func(_ context.Context, chatID, messageID, content string) error {
+			if chatID != "123" || messageID != "456" || content != "hello" {
+				t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+			}
+			return nil
+		},
+	}
+
+	m.RecordPlaceholder("test", "123", "456")
+
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "hello",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+	_, edited := m.preSend(context.Background(), "test", msg, ch)
+	if !edited {
+		t.Fatal("expected preSend to edit placeholder")
+	}
+	if ch.recordedChatID != "123" || ch.recordedMessageID != "456" {
+		t.Fatalf("expected tracked message 123/456, got %q/%q", ch.recordedChatID, ch.recordedMessageID)
+	}
+}
+
+func TestPreSend_ToolFeedbackPlaceholderEditUsesResolvedTrackedChatID(t *testing.T) {
+	m := newTestManager()
+
+	ch := &mockResolvedToolFeedbackEditor{
+		mockMessageEditor: mockMessageEditor{
+			editFn: func(_ context.Context, chatID, messageID, content string) error {
+				if chatID != "-100123" || messageID != "456" || content != "hello" {
+					t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+				}
+				return nil
+			},
+		},
+		resolveChatIDFn: func(chatID string, outboundCtx *bus.InboundContext) string {
+			if chatID != "-100123" {
+				t.Fatalf("expected raw chat ID, got %q", chatID)
+			}
+			if outboundCtx == nil || outboundCtx.TopicID != "42" {
+				t.Fatalf("expected topic-aware outbound context, got %+v", outboundCtx)
+			}
+			return chatID + "/" + outboundCtx.TopicID
+		},
+	}
+
+	m.RecordPlaceholder("test", "-100123", "456")
+
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "-100123",
+		Content: "hello",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "-100123",
+			TopicID: "42",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+	_, edited := m.preSend(context.Background(), "test", msg, ch)
+	if !edited {
+		t.Fatal("expected preSend to edit placeholder")
+	}
+	if ch.recordedChatID != "-100123/42" || ch.recordedMessageID != "456" {
+		t.Fatalf("expected resolved tracked message -100123/42/456, got %q/%q",
+			ch.recordedChatID, ch.recordedMessageID)
+	}
+}
+
+func TestPreSend_ToolFeedbackPlaceholderEditUsesPreparedContent(t *testing.T) {
+	m := newTestManager()
+
+	const rawContent = "🔧 `read_file`\n" + "<raw>"
+	const preparedContent = "🔧 `read_file`\n&lt;raw&gt;"
+
+	ch := &mockPreparedToolFeedbackEditor{
+		mockMessageEditor: mockMessageEditor{
+			editFn: func(_ context.Context, chatID, messageID, content string) error {
+				if chatID != "123" || messageID != "456" {
+					t.Fatalf("unexpected edit target: %s/%s", chatID, messageID)
+				}
+				if content != InitialAnimatedToolFeedbackContent(preparedContent) {
+					t.Fatalf("unexpected prepared content: %q", content)
+				}
+				return nil
+			},
+		},
+		prepareFn: func(content string) string {
+			if content != rawContent {
+				t.Fatalf("unexpected raw tool feedback: %q", content)
+			}
+			return preparedContent
+		},
+	}
+
+	m.RecordPlaceholder("test", "123", "456")
+
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: rawContent,
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+
+	_, edited := m.preSend(context.Background(), "test", msg, ch)
+	if !edited {
+		t.Fatal("expected preSend to edit placeholder")
+	}
+	if ch.recordedContent != preparedContent {
+		t.Fatalf("expected tracked content %q, got %q", preparedContent, ch.recordedContent)
+	}
+}
+
+func TestPreSend_NonToolFeedbackLeavesTrackedMessageForChannelSend(t *testing.T) {
+	m := newTestManager()
+	ch := &mockMessageEditor{}
+
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "final reply",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+		},
+	})
+
+	_, edited := m.preSend(context.Background(), "test", msg, ch)
+	if edited {
+		t.Fatal("expected preSend to fall through when no placeholder exists")
+	}
+	if ch.dismissedChatID != "" {
+		t.Fatalf("expected tracked tool feedback cleanup to be deferred to channel send, got %q", ch.dismissedChatID)
+	}
+}
+
+func TestPreSend_NonToolFeedbackDefersTrackedMessageFinalizationToChannelSend(t *testing.T) {
+	m := newTestManager()
+	ch := &mockMessageEditor{
+		finalizeFn: func(_ context.Context, msg bus.OutboundMessage) ([]string, bool) {
+			if msg.ChatID != "123" || msg.Content != "final reply" {
+				t.Fatalf("unexpected finalize msg: %+v", msg)
+			}
+			return []string{"tool-msg-1"}, true
+		},
+	}
+
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "final reply",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+		},
+	})
+
+	msgIDs, handled := m.preSend(context.Background(), "test", msg, ch)
+	if handled {
+		t.Fatalf("expected preSend to defer to channel Send, got msgIDs=%v", msgIDs)
+	}
+	if len(msgIDs) != 0 {
+		t.Fatalf("expected no msgIDs from preSend, got %v", msgIDs)
+	}
+	if ch.dismissedChatID != "" {
+		t.Fatalf("expected tracked cleanup to remain in channel Send, got %q", ch.dismissedChatID)
+	}
+	if ch.finalizeCalled {
+		t.Fatal("expected preSend to skip channel tool feedback finalization")
+	}
+}
+
+func TestPreSend_StaleToolFeedbackDoesNotConsumeStreamActiveMarker(t *testing.T) {
+	m := newTestManager()
+	m.streamActive.Store("test:123", true)
+	m.RecordPlaceholder("test", "123", "placeholder-1")
+
+	var editedContent string
+	ch := &mockMessageEditor{
+		editFn: func(_ context.Context, chatID, messageID, content string) error {
+			if chatID != "123" || messageID != "placeholder-1" {
+				t.Fatalf("unexpected edit target: %s/%s", chatID, messageID)
+			}
+			editedContent = content
+			return nil
+		},
+	}
+
+	toolFeedback := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "🔧 `read_file`\nReading config",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+
+	msgIDs, handled := m.preSend(context.Background(), "test", toolFeedback, ch)
+	if !handled {
+		t.Fatal("expected stale tool feedback to be dropped after stream finalize")
+	}
+	if len(msgIDs) != 0 {
+		t.Fatalf("expected no delivered message IDs for stale feedback, got %v", msgIDs)
+	}
+	if _, ok := m.streamActive.Load("test:123"); !ok {
+		t.Fatal("expected streamActive marker to remain for the final outbound message")
+	}
+	if _, ok := m.placeholders.Load("test:123"); !ok {
+		t.Fatal("expected placeholder cleanup to remain deferred to the final outbound message")
+	}
+	if ch.editedMessages != 0 {
+		t.Fatalf("expected no placeholder edit for stale feedback, got %d edits", ch.editedMessages)
+	}
+
+	finalMsg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "final streamed reply",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+		},
+	})
+
+	_, handled = m.preSend(context.Background(), "test", finalMsg, ch)
+	if !handled {
+		t.Fatal("expected final outbound message to consume streamActive marker")
+	}
+	if _, ok := m.streamActive.Load("test:123"); ok {
+		t.Fatal("expected streamActive marker to be cleared by final outbound message")
+	}
+	if _, ok := m.placeholders.Load("test:123"); ok {
+		t.Fatal("expected placeholder to be cleaned up by final outbound message")
+	}
+	if editedContent != "final streamed reply" {
+		t.Fatalf("editedContent = %q, want final streamed reply", editedContent)
+	}
+}
+
+func TestPreSendMedia_LeavesTrackedMessageForChannelSend(t *testing.T) {
+	m := newTestManager()
+	ch := &mockDeletingMediaChannel{}
+
+	m.preSendMedia(context.Background(), "test", bus.OutboundMediaMessage{
+		ChatID: "123",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+		},
+	}, ch)
+
+	if ch.dismissedChatID != "" {
+		t.Fatalf(
+			"expected tracked tool feedback cleanup to be deferred to channel media send, got %q",
+			ch.dismissedChatID,
+		)
+	}
+}
+
+func TestSplitOutboundMessageContent_ToolFeedbackTruncatesInsteadOfSplitting(t *testing.T) {
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "\U0001f527 `read_file`\nRead README.md first to confirm the current project structure before editing the config example.",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+
+	chunks := splitOutboundMessageContent(msg, 40)
+	if len(chunks) != 1 {
+		t.Fatalf("len(chunks) = %d, want 1", len(chunks))
+	}
+	want := utils.FitToolFeedbackMessage(msg.Content, 40-MaxToolFeedbackAnimationFrameLength())
+	if chunks[0] != want {
+		t.Fatalf("chunk = %q, want %q", chunks[0], want)
+	}
+}
+
+func TestSplitOutboundMessageContent_ToolFeedbackReservesAnimationFrame(t *testing.T) {
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: "🔧 `read_file`\n1234567890",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+
+	chunks := splitOutboundMessageContent(msg, len([]rune(msg.Content)))
+	if len(chunks) != 1 {
+		t.Fatalf("len(chunks) = %d, want 1", len(chunks))
+	}
+
+	animated := formatAnimatedToolFeedbackContent(chunks[0], strings.Repeat(".", MaxToolFeedbackAnimationFrameLength()))
+	if got, maxLen := len([]rune(animated)), len([]rune(msg.Content)); got > maxLen {
+		t.Fatalf("animated len = %d, want <= %d; content=%q", got, maxLen, animated)
+	}
+}
+
+func TestGetStreamer_FinalizeDismissesTrackedToolFeedback(t *testing.T) {
+	m := newTestManager()
+	ch := &mockStreamingChannel{
+		mockMessageEditor: mockMessageEditor{},
+		streamer: &mockStreamer{
+			finalizeFn: func(_ context.Context, content string) error {
+				if content != "final reply" {
+					t.Fatalf("unexpected finalize content: %q", content)
+				}
+				return nil
+			},
+		},
+	}
+	m.channels["test"] = ch
+
+	streamer, ok := m.GetStreamer(context.Background(), "test", "123")
+	if !ok {
+		t.Fatal("expected streamer to be available")
+	}
+	if err := streamer.Finalize(context.Background(), "final reply"); err != nil {
+		t.Fatalf("Finalize() error = %v", err)
+	}
+	if ch.dismissedChatID != "123" {
+		t.Fatalf("expected tracked tool feedback to be dismissed for chat 123, got %q", ch.dismissedChatID)
+	}
+	if _, ok := m.streamActive.Load("test:123"); !ok {
+		t.Fatal("expected streamActive marker to be recorded after finalize")
+	}
+}
+
+func TestGetStreamer_FinalizeDismissesResolvedTrackedToolFeedback(t *testing.T) {
+	m := newTestManager()
+	ch := &mockStreamingChannel{
+		mockMessageEditor: mockMessageEditor{},
+		streamer: &mockStreamer{
+			finalizeFn: func(_ context.Context, content string) error {
+				if content != "final reply" {
+					t.Fatalf("unexpected finalize content: %q", content)
+				}
+				return nil
+			},
+		},
+		resolveChatIDFn: func(chatID string, outboundCtx *bus.InboundContext) string {
+			if outboundCtx == nil {
+				t.Fatal("expected outbound context during stream finalize")
+			}
+			if outboundCtx.ChatID != "-100123/42" {
+				t.Fatalf("unexpected outbound context: %+v", outboundCtx)
+			}
+			return outboundCtx.ChatID
+		},
+	}
+	m.channels["test"] = ch
+
+	streamer, ok := m.GetStreamer(context.Background(), "test", "-100123/42")
+	if !ok {
+		t.Fatal("expected streamer to be available")
+	}
+	if err := streamer.Finalize(context.Background(), "final reply"); err != nil {
+		t.Fatalf("Finalize() error = %v", err)
+	}
+	if ch.dismissedChatID != "-100123/42" {
+		t.Fatalf("expected resolved tracked tool feedback dismissal, got %q", ch.dismissedChatID)
+	}
+	if _, ok := m.streamActive.Load("test:-100123/42"); !ok {
+		t.Fatal("expected streamActive marker to be recorded after finalize")
+	}
+}
+
+func TestPreSend_PlaceholderEditSuccessDismissesResolvedTrackedToolFeedback(t *testing.T) {
+	m := newTestManager()
+
+	ch := &mockResolvedToolFeedbackEditor{
+		mockMessageEditor: mockMessageEditor{
+			editFn: func(_ context.Context, chatID, messageID, content string) error {
+				if chatID != "-100123" || messageID != "456" || content != "done" {
+					t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+				}
+				return nil
+			},
+		},
+		resolveChatIDFn: func(chatID string, outboundCtx *bus.InboundContext) string {
+			if outboundCtx == nil || outboundCtx.TopicID != "42" {
+				t.Fatalf("expected topic-aware outbound context, got %+v", outboundCtx)
+			}
+			return chatID + "/" + outboundCtx.TopicID
+		},
+	}
+
+	m.RecordPlaceholder("test", "-100123", "456")
+
+	msg := testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "-100123",
+		Content: "done",
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "-100123",
+			TopicID: "42",
+		},
+	})
+
+	_, edited := m.preSend(context.Background(), "test", msg, ch)
+	if !edited {
+		t.Fatal("expected preSend to edit placeholder")
+	}
+	if ch.dismissedChatID != "-100123/42" {
+		t.Fatalf("expected resolved tracked dismissal, got %q", ch.dismissedChatID)
+	}
+}
+
+func TestGetStreamer_FinalizeFailureDoesNotDismissTrackedToolFeedback(t *testing.T) {
+	m := newTestManager()
+	ch := &mockStreamingChannel{
+		mockMessageEditor: mockMessageEditor{},
+		streamer: &mockStreamer{
+			finalizeFn: func(context.Context, string) error {
+				return errors.New("finalize failed")
+			},
+		},
+	}
+	m.channels["test"] = ch
+
+	streamer, ok := m.GetStreamer(context.Background(), "test", "123")
+	if !ok {
+		t.Fatal("expected streamer to be available")
+	}
+	if err := streamer.Finalize(context.Background(), "final reply"); err == nil {
+		t.Fatal("expected Finalize() to fail")
+	}
+	if ch.dismissedChatID != "" {
+		t.Fatalf("expected no tool feedback dismissal on finalize failure, got %q", ch.dismissedChatID)
+	}
+	if _, ok := m.streamActive.Load("test:123"); ok {
+		t.Fatal("expected no streamActive marker after finalize failure")
+	}
+}
+
+func TestRunWorker_ToolFeedbackSkipsMarkerSplitting(t *testing.T) {
+	m := newTestManager()
+	m.config = &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				SplitOnMarker: true,
+			},
+		},
+	}
+
+	var (
+		mu       sync.Mutex
+		received []string
+	)
+	ch := &mockChannelWithLength{
+		mockChannel: mockChannel{
+			sendFn: func(_ context.Context, msg bus.OutboundMessage) error {
+				mu.Lock()
+				received = append(received, msg.Content)
+				mu.Unlock()
+				return nil
+			},
+		},
+		maxLen: 200,
+	}
+
+	w := &channelWorker{
+		ch:      ch,
+		queue:   make(chan bus.OutboundMessage, 1),
+		done:    make(chan struct{}),
+		limiter: rate.NewLimiter(rate.Inf, 1),
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	go m.runWorker(ctx, "test", w)
+
+	content := "🔧 `read_file`\nRead current config first.<|[SPLIT]|>Then update the example."
+	w.queue <- testOutboundMessage(bus.OutboundMessage{
+		Channel: "test",
+		ChatID:  "123",
+		Content: content,
+		Context: bus.InboundContext{
+			Channel: "test",
+			ChatID:  "123",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+
+	time.Sleep(100 * time.Millisecond)
+
+	mu.Lock()
+	defer mu.Unlock()
+	if len(received) != 1 {
+		t.Fatalf("len(received) = %d, want 1", len(received))
+	}
+	if received[0] != content {
+		t.Fatalf("received[0] = %q, want %q", received[0], content)
+	}
+}
+
 func TestPreSend_PlaceholderEditFails_FallsThrough(t *testing.T) {
 	m := newTestManager()
 

pkg/channels/matrix/matrix.go

@@ -46,6 +46,13 @@ const (
 
 var matrixMentionHrefRegexp = regexp.MustCompile(`(?i)<a[^>]+href=["']([^"']+)["']`)
 
+func outboundMessageIsToolFeedback(msg bus.OutboundMessage) bool {
+	if len(msg.Context.Raw) == 0 {
+		return false
+	}
+	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), "tool_feedback")
+}
+
 type roomKindCacheEntry struct {
 	isGroup   bool
 	expiresAt time.Time
@@ -192,6 +199,7 @@ type MatrixChannel struct {
 
 	cryptoHelper *cryptohelper.CryptoHelper
 	cryptoDbPath string
+	progress     *channels.ToolFeedbackAnimator
 }
 
 func NewMatrixChannel(
@@ -236,7 +244,7 @@ func NewMatrixChannel(
 		channels.WithReasoningChannelID(bc.ReasoningChannelID),
 	)
 
-	return &MatrixChannel{
+	ch := &MatrixChannel{
 		BaseChannel:       base,
 		bc:                bc,
 		client:            client,
@@ -248,7 +256,9 @@ func NewMatrixChannel(
 		localpartMentionR: localpartMentionRegexp(matrixLocalpart(client.UserID)),
 		typingMu:          sync.Mutex{},
 		cryptoDbPath:      cryptoDatabasePath,
-	}, nil
+	}
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
+	return ch, nil
 }
 
 func (c *MatrixChannel) Start(ctx context.Context) error {
@@ -297,6 +307,9 @@ func (c *MatrixChannel) Stop(ctx context.Context) error {
 		c.cancel()
 	}
 	c.stopTypingSessions(ctx)
+	if c.progress != nil {
+		c.progress.StopAll()
+	}
 
 	// Close crypto helper if initialized
 	if c.cryptoHelper != nil {
@@ -398,11 +411,36 @@ func (c *MatrixChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]st
 		return nil, nil
 	}
 
+	isToolFeedback := outboundMessageIsToolFeedback(msg)
+	if isToolFeedback {
+		if msgID, handled, err := c.progress.Update(ctx, msg.ChatID, content); handled {
+			if err != nil {
+				return nil, err
+			}
+			return []string{msgID}, nil
+		}
+	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(msg.ChatID)
+	if !isToolFeedback {
+		if msgIDs, handled := c.FinalizeToolFeedbackMessage(ctx, msg); handled {
+			return msgIDs, nil
+		}
+	}
+	if isToolFeedback {
+		content = channels.InitialAnimatedToolFeedbackContent(content)
+	}
+
 	resp, err := c.client.SendMessageEvent(ctx, roomID, event.EventMessage, c.messageContent(content))
 	if err != nil {
 		return nil, fmt.Errorf("matrix send: %w", channels.ErrTemporary)
 	}
-	return []string{resp.EventID.String()}, nil
+	msgID := resp.EventID.String()
+	if isToolFeedback {
+		c.RecordToolFeedbackMessage(msg.ChatID, msgID, msg.Content)
+	} else if hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+	}
+	return []string{msgID}, nil
 }
 
 func (c *MatrixChannel) messageContent(text string) *event.MessageEventContent {
@@ -419,6 +457,8 @@ func (c *MatrixChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMess
 	if !c.IsRunning() {
 		return nil, channels.ErrNotRunning
 	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(msg.ChatID)
+
 	sendCtx := ctx
 	if sendCtx == nil {
 		sendCtx = context.Background()
@@ -529,6 +569,10 @@ func (c *MatrixChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMess
 		}
 	}
 
+	if hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+	}
+
 	return eventIDs, nil
 }
 
@@ -612,6 +656,89 @@ func (c *MatrixChannel) EditMessage(ctx context.Context, chatID string, messageI
 	return err
 }
 
+// DeleteMessage implements channels.MessageDeleter.
+func (c *MatrixChannel) DeleteMessage(ctx context.Context, chatID string, messageID string) error {
+	roomID := id.RoomID(strings.TrimSpace(chatID))
+	if roomID == "" {
+		return fmt.Errorf("matrix room ID is empty")
+	}
+	eventID := id.EventID(strings.TrimSpace(messageID))
+	if eventID == "" {
+		return fmt.Errorf("matrix message ID is empty")
+	}
+
+	_, err := c.client.RedactEvent(ctx, roomID, eventID)
+	return err
+}
+
+func (c *MatrixChannel) currentToolFeedbackMessage(chatID string) (string, bool) {
+	if c.progress == nil {
+		return "", false
+	}
+	return c.progress.Current(chatID)
+}
+
+func (c *MatrixChannel) takeToolFeedbackMessage(chatID string) (string, string, bool) {
+	if c.progress == nil {
+		return "", "", false
+	}
+	return c.progress.Take(chatID)
+}
+
+func (c *MatrixChannel) RecordToolFeedbackMessage(chatID, messageID, content string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Record(chatID, messageID, content)
+}
+
+func (c *MatrixChannel) ClearToolFeedbackMessage(chatID string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Clear(chatID)
+}
+
+func (c *MatrixChannel) DismissToolFeedbackMessage(ctx context.Context, chatID string) {
+	msgID, ok := c.currentToolFeedbackMessage(chatID)
+	if !ok {
+		return
+	}
+	c.dismissTrackedToolFeedbackMessage(ctx, chatID, msgID)
+}
+
+func (c *MatrixChannel) dismissTrackedToolFeedbackMessage(ctx context.Context, chatID, messageID string) {
+	if strings.TrimSpace(chatID) == "" || strings.TrimSpace(messageID) == "" {
+		return
+	}
+	c.ClearToolFeedbackMessage(chatID)
+	_ = c.DeleteMessage(ctx, chatID, messageID)
+}
+
+func (c *MatrixChannel) finalizeTrackedToolFeedbackMessage(
+	ctx context.Context,
+	chatID string,
+	content string,
+	editFn func(context.Context, string, string, string) error,
+) ([]string, bool) {
+	msgID, baseContent, ok := c.takeToolFeedbackMessage(chatID)
+	if !ok || editFn == nil {
+		return nil, false
+	}
+	if err := editFn(ctx, chatID, msgID, content); err != nil {
+		c.RecordToolFeedbackMessage(chatID, msgID, baseContent)
+		return nil, false
+	}
+	return []string{msgID}, true
+}
+
+func (c *MatrixChannel) FinalizeToolFeedbackMessage(ctx context.Context, msg bus.OutboundMessage) ([]string, bool) {
+	if outboundMessageIsToolFeedback(msg) {
+		return nil, false
+	}
+	return c.finalizeTrackedToolFeedbackMessage(ctx, msg.ChatID, msg.Content, c.EditMessage)
+}
+
 func (c *MatrixChannel) handleMemberEvent(ctx context.Context, evt *event.Event) {
 	if !c.config.JoinOnInvite {
 		return

pkg/channels/matrix/matrix_test.go

@@ -14,6 +14,7 @@ import (
 	"maunium.net/go/mautrix/event"
 	"maunium.net/go/mautrix/id"
 
+	"github.com/sipeed/picoclaw/pkg/channels"
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/media"
 )
@@ -41,6 +42,34 @@ func TestMatrixLocalpartMentionRegexp(t *testing.T) {
 	}
 }
 
+func TestFinalizeTrackedToolFeedbackMessage_StopsTrackingBeforeEdit(t *testing.T) {
+	ch := &MatrixChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("!room:matrix.org", "$event1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"!room:matrix.org",
+		"final reply",
+		func(_ context.Context, chatID, messageID, content string) error {
+			if _, ok := ch.currentToolFeedbackMessage(chatID); ok {
+				t.Fatal("expected tracked tool feedback to be stopped before edit")
+			}
+			if chatID != "!room:matrix.org" || messageID != "$event1" || content != "final reply" {
+				t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+			}
+			return nil
+		},
+	)
+	if !handled {
+		t.Fatal("expected finalizeTrackedToolFeedbackMessage to handle tracked message")
+	}
+	if len(msgIDs) != 1 || msgIDs[0] != "$event1" {
+		t.Fatalf("finalizeTrackedToolFeedbackMessage() ids = %v, want [$event1]", msgIDs)
+	}
+}
+
 func TestStripUserMention(t *testing.T) {
 	userID := id.UserID("@picoclaw:matrix.org")
 

pkg/channels/pico/pico.go

@@ -50,6 +50,17 @@ func outboundMessageIsThought(msg bus.OutboundMessage) bool {
 	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), MessageKindThought)
 }
 
+func outboundMessageIsToolFeedback(msg bus.OutboundMessage) bool {
+	if len(msg.Context.Raw) == 0 {
+		return false
+	}
+	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), "tool_feedback")
+}
+
+func outboundMessageFinalizesTrackedToolFeedback(msg bus.OutboundMessage) bool {
+	return !outboundMessageIsToolFeedback(msg) && !outboundMessageIsThought(msg)
+}
+
 // writeJSON sends a JSON message to the connection with write locking.
 func (pc *picoConn) writeJSON(v any) error {
 	if pc.closed.Load() {
@@ -82,6 +93,8 @@ type PicoChannel struct {
 	connsMu            sync.RWMutex
 	ctx                context.Context
 	cancel             context.CancelFunc
+	progress           *channels.ToolFeedbackAnimator
+	deleteMessageFn    func(context.Context, string, string) error
 }
 
 // NewPicoChannel creates a new Pico Protocol channel.
@@ -110,7 +123,7 @@ func NewPicoChannel(
 		return false
 	}
 
-	return &PicoChannel{
+	ch := &PicoChannel{
 		BaseChannel: base,
 		bc:          bc,
 		config:      cfg,
@@ -121,7 +134,10 @@ func NewPicoChannel(
 		},
 		connections:        make(map[string]*picoConn),
 		sessionConnections: make(map[string]map[string]*picoConn),
-	}, nil
+	}
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
+	ch.deleteMessageFn = ch.DeleteMessage
+	return ch, nil
 }
 
 // createAndAddConnection checks MaxConnections and registers a connection atomically.
@@ -239,6 +255,9 @@ func (c *PicoChannel) Stop(ctx context.Context) error {
 	if c.cancel != nil {
 		c.cancel()
 	}
+	if c.progress != nil {
+		c.progress.StopAll()
+	}
 
 	logger.InfoC("pico", "Pico Protocol channel stopped")
 	return nil
@@ -269,26 +288,133 @@ func (c *PicoChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]stri
 		return nil, channels.ErrNotRunning
 	}
 	isThought := outboundMessageIsThought(msg)
+	isToolFeedback := outboundMessageIsToolFeedback(msg)
+	if isToolFeedback {
+		if msgID, handled, err := c.progress.Update(ctx, msg.ChatID, msg.Content); handled {
+			if err != nil {
+				return nil, err
+			}
+			return []string{msgID}, nil
+		}
+	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(msg.ChatID)
+	if outboundMessageFinalizesTrackedToolFeedback(msg) {
+		if msgIDs, handled := c.FinalizeToolFeedbackMessage(ctx, msg); handled {
+			return msgIDs, nil
+		}
+	}
+
+	content := msg.Content
+	if isToolFeedback {
+		content = channels.InitialAnimatedToolFeedbackContent(msg.Content)
+	}
+	msgID := uuid.New().String()
 
 	payload := map[string]any{
-		PayloadKeyContent: msg.Content,
+		PayloadKeyContent: content,
 		PayloadKeyThought: isThought,
+		"message_id":      msgID,
 	}
 	setContextUsagePayload(payload, msg.ContextUsage)
 	outMsg := newMessage(TypeMessageCreate, payload)
 
-	return nil, c.broadcastToSession(msg.ChatID, outMsg)
+	if err := c.broadcastToSession(msg.ChatID, outMsg); err != nil {
+		return nil, err
+	}
+	if isToolFeedback {
+		c.RecordToolFeedbackMessage(msg.ChatID, msgID, msg.Content)
+	} else if hasTrackedMsg && outboundMessageFinalizesTrackedToolFeedback(msg) {
+		c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+	}
+	return []string{msgID}, nil
 }
 
 // EditMessage implements channels.MessageEditor.
 func (c *PicoChannel) EditMessage(ctx context.Context, chatID string, messageID string, content string) error {
-	outMsg := newMessage(TypeMessageUpdate, map[string]any{
+	return c.editMessage(ctx, chatID, messageID, content, nil)
+}
+
+// DeleteMessage implements channels.MessageDeleter.
+func (c *PicoChannel) DeleteMessage(ctx context.Context, chatID string, messageID string) error {
+	outMsg := newMessage(TypeMessageDelete, map[string]any{
 		"message_id": messageID,
-		"content":    content,
 	})
 	return c.broadcastToSession(chatID, outMsg)
 }
 
+func (c *PicoChannel) currentToolFeedbackMessage(chatID string) (string, bool) {
+	if c.progress == nil {
+		return "", false
+	}
+	return c.progress.Current(chatID)
+}
+
+func (c *PicoChannel) takeToolFeedbackMessage(chatID string) (string, string, bool) {
+	if c.progress == nil {
+		return "", "", false
+	}
+	return c.progress.Take(chatID)
+}
+
+func (c *PicoChannel) RecordToolFeedbackMessage(chatID, messageID, content string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Record(chatID, messageID, content)
+}
+
+func (c *PicoChannel) ClearToolFeedbackMessage(chatID string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Clear(chatID)
+}
+
+func (c *PicoChannel) DismissToolFeedbackMessage(ctx context.Context, chatID string) {
+	msgID, ok := c.currentToolFeedbackMessage(chatID)
+	if !ok {
+		return
+	}
+	c.dismissTrackedToolFeedbackMessage(ctx, chatID, msgID)
+}
+
+func (c *PicoChannel) dismissTrackedToolFeedbackMessage(ctx context.Context, chatID, messageID string) {
+	if strings.TrimSpace(chatID) == "" || strings.TrimSpace(messageID) == "" {
+		return
+	}
+	c.ClearToolFeedbackMessage(chatID)
+	deleteFn := c.deleteMessageFn
+	if deleteFn == nil {
+		deleteFn = c.DeleteMessage
+	}
+	_ = deleteFn(ctx, chatID, messageID)
+}
+
+func (c *PicoChannel) finalizeTrackedToolFeedbackMessage(
+	ctx context.Context,
+	chatID string,
+	content string,
+	editFn func(context.Context, string, string, string, *bus.ContextUsage) error,
+	contextUsage *bus.ContextUsage,
+) ([]string, bool) {
+	msgID, baseContent, ok := c.takeToolFeedbackMessage(chatID)
+	if !ok || editFn == nil {
+		return nil, false
+	}
+	if err := editFn(ctx, chatID, msgID, content, contextUsage); err != nil {
+		c.RecordToolFeedbackMessage(chatID, msgID, baseContent)
+		return nil, false
+	}
+	return []string{msgID}, true
+}
+
+func (c *PicoChannel) FinalizeToolFeedbackMessage(ctx context.Context, msg bus.OutboundMessage) ([]string, bool) {
+	if !outboundMessageFinalizesTrackedToolFeedback(msg) {
+		return nil, false
+	}
+	return c.finalizeTrackedToolFeedbackMessage(ctx, msg.ChatID, msg.Content, c.editMessage, msg.ContextUsage)
+}
+
 // StartTyping implements channels.TypingCapable.
 func (c *PicoChannel) StartTyping(ctx context.Context, chatID string) (func(), error) {
 	startMsg := newMessage(TypeTypingStart, nil)
@@ -332,6 +458,7 @@ func (c *PicoChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessag
 	if !c.IsRunning() {
 		return nil, channels.ErrNotRunning
 	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(msg.ChatID)
 
 	store := c.GetMediaStore()
 	if store == nil {
@@ -407,6 +534,9 @@ func (c *PicoChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessag
 	if err := c.broadcastToSession(msg.ChatID, outMsg); err != nil {
 		return nil, err
 	}
+	if hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, msg.ChatID, trackedMsgID)
+	}
 
 	return []string{msgID}, nil
 }
@@ -939,3 +1069,19 @@ func setContextUsagePayload(payload map[string]any, u *bus.ContextUsage) {
 		"used_percent":       u.UsedPercent,
 	}
 }
+
+func (c *PicoChannel) editMessage(
+	ctx context.Context,
+	chatID string,
+	messageID string,
+	content string,
+	contextUsage *bus.ContextUsage,
+) error {
+	payload := map[string]any{
+		"message_id": messageID,
+		"content":    content,
+	}
+	setContextUsagePayload(payload, contextUsage)
+	outMsg := newMessage(TypeMessageUpdate, payload)
+	return c.broadcastToSession(chatID, outMsg)
+}

pkg/channels/pico/pico_test.go

@@ -4,12 +4,16 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/http"
 	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"strings"
 	"sync"
 	"testing"
+	"time"
+
+	"github.com/gorilla/websocket"
 
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/channels"
@@ -32,6 +36,163 @@ func newTestPicoChannel(t *testing.T) *PicoChannel {
 	return ch
 }
 
+func TestFinalizeTrackedToolFeedbackMessage_StopsTrackingBeforeEdit(t *testing.T) {
+	ch := &PicoChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("pico:chat-1", "msg-1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"pico:chat-1",
+		"final reply",
+		func(_ context.Context, chatID, messageID, content string, contextUsage *bus.ContextUsage) error {
+			if _, ok := ch.currentToolFeedbackMessage(chatID); ok {
+				t.Fatal("expected tracked tool feedback to be stopped before edit")
+			}
+			if chatID != "pico:chat-1" || messageID != "msg-1" || content != "final reply" {
+				t.Fatalf("unexpected edit args: %s %s %s", chatID, messageID, content)
+			}
+			if contextUsage != nil {
+				t.Fatalf("unexpected context usage: %+v", contextUsage)
+			}
+			return nil
+		},
+		nil,
+	)
+	if !handled {
+		t.Fatal("expected finalizeTrackedToolFeedbackMessage to handle tracked message")
+	}
+	if len(msgIDs) != 1 || msgIDs[0] != "msg-1" {
+		t.Fatalf("finalizeTrackedToolFeedbackMessage() ids = %v, want [msg-1]", msgIDs)
+	}
+}
+
+func TestDismissTrackedToolFeedbackMessage_DeletesProgressMessage(t *testing.T) {
+	ch := &PicoChannel{
+		progress: channels.NewToolFeedbackAnimator(nil),
+	}
+	ch.RecordToolFeedbackMessage("pico:chat-1", "msg-1", "🔧 `read_file`")
+
+	var deleted struct {
+		chatID    string
+		messageID string
+	}
+	ch.deleteMessageFn = func(_ context.Context, chatID string, messageID string) error {
+		deleted.chatID = chatID
+		deleted.messageID = messageID
+		return nil
+	}
+
+	ch.DismissToolFeedbackMessage(context.Background(), "pico:chat-1")
+
+	if deleted.chatID != "pico:chat-1" || deleted.messageID != "msg-1" {
+		t.Fatalf("unexpected delete target: %+v", deleted)
+	}
+	if _, ok := ch.currentToolFeedbackMessage("pico:chat-1"); ok {
+		t.Fatal("expected tracked tool feedback to be cleared after dismissal")
+	}
+}
+
+func TestSend_ThoughtMessageDoesNotFinalizeTrackedToolFeedback(t *testing.T) {
+	ch := newTestPicoChannel(t)
+
+	if err := ch.Start(context.Background()); err != nil {
+		t.Fatalf("Start() error = %v", err)
+	}
+	defer ch.Stop(context.Background())
+
+	clientConn, received, cleanup := newTestPicoWebSocket(t)
+	defer cleanup()
+	ch.addConnForTest(&picoConn{id: "conn-1", conn: clientConn, sessionID: "sess-1"})
+
+	ch.RecordToolFeedbackMessage("pico:sess-1", "msg-progress", "🔧 `read_file`\nReading config")
+
+	if _, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "pico:sess-1",
+		Content: "thinking trace",
+		Context: bus.InboundContext{
+			Channel: "pico",
+			ChatID:  "pico:sess-1",
+			Raw: map[string]string{
+				"message_kind": MessageKindThought,
+			},
+		},
+	}); err != nil {
+		t.Fatalf("Send(thought) error = %v", err)
+	}
+
+	select {
+	case msg := <-received:
+		if msg.Type != TypeMessageCreate {
+			t.Fatalf("thought message type = %q, want %q", msg.Type, TypeMessageCreate)
+		}
+		payload := msg.Payload
+		if got := payload[PayloadKeyContent]; got != "thinking trace" {
+			t.Fatalf("thought content = %#v, want %q", got, "thinking trace")
+		}
+		if got := payload[PayloadKeyThought]; got != true {
+			t.Fatalf("thought flag = %#v, want true", got)
+		}
+		if got := payload["message_id"]; got == "msg-progress" || got == nil || got == "" {
+			t.Fatalf("thought message_id = %#v, want new non-progress id", got)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("expected thought message to be delivered")
+	}
+
+	if msgID, ok := ch.currentToolFeedbackMessage("pico:sess-1"); !ok || msgID != "msg-progress" {
+		t.Fatalf("tracked tool feedback = (%q, %v), want (msg-progress, true)", msgID, ok)
+	}
+
+	if _, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "pico:sess-1",
+		Content: "final reply",
+		Context: bus.InboundContext{
+			Channel: "pico",
+			ChatID:  "pico:sess-1",
+		},
+		ContextUsage: &bus.ContextUsage{
+			UsedTokens:       321,
+			TotalTokens:      4096,
+			CompressAtTokens: 3072,
+			UsedPercent:      8,
+		},
+	}); err != nil {
+		t.Fatalf("Send(final) error = %v", err)
+	}
+
+	select {
+	case msg := <-received:
+		if msg.Type != TypeMessageUpdate {
+			t.Fatalf("final message type = %q, want %q", msg.Type, TypeMessageUpdate)
+		}
+		payload := msg.Payload
+		if got := payload["message_id"]; got != "msg-progress" {
+			t.Fatalf("final message_id = %#v, want %q", got, "msg-progress")
+		}
+		if got := payload[PayloadKeyContent]; got != "final reply" {
+			t.Fatalf("final content = %#v, want %q", got, "final reply")
+		}
+		rawUsage, ok := payload["context_usage"].(map[string]any)
+		if !ok {
+			t.Fatalf("final context_usage = %#v, want map payload", payload["context_usage"])
+		}
+		if got, ok := rawUsage["used_tokens"].(float64); !ok || got != 321 {
+			t.Fatalf("used_tokens = %#v, want 321", rawUsage["used_tokens"])
+		}
+		if got, ok := rawUsage["total_tokens"].(float64); !ok || got != 4096 {
+			t.Fatalf("total_tokens = %#v, want 4096", rawUsage["total_tokens"])
+		}
+	case <-time.After(time.Second):
+		t.Fatal("expected final reply to finalize tracked tool feedback")
+	}
+
+	if _, ok := ch.currentToolFeedbackMessage("pico:sess-1"); ok {
+		t.Fatal("expected tracked tool feedback to be cleared after final reply")
+	}
+}
+
 func TestCreateAndAddConnection_RespectsMaxConnectionsConcurrently(t *testing.T) {
 	ch := newTestPicoChannel(t)
 
@@ -169,6 +330,75 @@ func TestSendMedia_ResolvesMediaBeforeDelivery(t *testing.T) {
 	}
 }
 
+func TestSendMedia_DismissesTrackedToolFeedbackMessage(t *testing.T) {
+	ch := newTestPicoChannel(t)
+	store := media.NewFileMediaStore()
+	ch.SetMediaStore(store)
+
+	if err := ch.Start(context.Background()); err != nil {
+		t.Fatalf("Start() error = %v", err)
+	}
+	defer ch.Stop(context.Background())
+
+	clientConn, received, cleanup := newTestPicoWebSocket(t)
+	defer cleanup()
+	ch.addConnForTest(&picoConn{id: "conn-1", conn: clientConn, sessionID: "sess-1"})
+
+	localPath := filepath.Join(t.TempDir(), "report.txt")
+	if err := os.WriteFile(localPath, []byte("attachment body"), 0o600); err != nil {
+		t.Fatalf("WriteFile() error = %v", err)
+	}
+
+	ref, err := store.Store(localPath, media.MediaMeta{
+		Filename:    "report.txt",
+		ContentType: "text/plain",
+	}, "test-scope")
+	if err != nil {
+		t.Fatalf("Store() error = %v", err)
+	}
+
+	ch.RecordToolFeedbackMessage("pico:sess-1", "msg-progress", "🔧 `read_file`")
+
+	var deleted struct {
+		chatID    string
+		messageID string
+	}
+	ch.deleteMessageFn = func(_ context.Context, chatID string, messageID string) error {
+		deleted.chatID = chatID
+		deleted.messageID = messageID
+		return nil
+	}
+
+	_, err = ch.SendMedia(context.Background(), bus.OutboundMediaMessage{
+		ChatID: "pico:sess-1",
+		Parts: []bus.MediaPart{{
+			Ref:         ref,
+			Type:        "file",
+			Filename:    "report.txt",
+			ContentType: "text/plain",
+		}},
+	})
+	if err != nil {
+		t.Fatalf("SendMedia() error = %v", err)
+	}
+
+	select {
+	case msg := <-received:
+		if msg.Type != TypeMessageCreate {
+			t.Fatalf("message type = %q, want %q", msg.Type, TypeMessageCreate)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("expected media message to be delivered")
+	}
+
+	if deleted.chatID != "pico:sess-1" || deleted.messageID != "msg-progress" {
+		t.Fatalf("unexpected delete target: %+v", deleted)
+	}
+	if _, ok := ch.currentToolFeedbackMessage("pico:sess-1"); ok {
+		t.Fatal("expected tracked tool feedback to be cleared after media delivery")
+	}
+}
+
 func TestPicoDownloadURLForRef(t *testing.T) {
 	got, err := picoDownloadURLForRef("media://attachment-1")
 	if err != nil {
@@ -240,3 +470,39 @@ func (c *PicoChannel) addConnForTest(pc *picoConn) {
 	}
 	bySession[pc.id] = pc
 }
+
+func newTestPicoWebSocket(t *testing.T) (*websocket.Conn, <-chan PicoMessage, func()) {
+	t.Helper()
+
+	received := make(chan PicoMessage, 4)
+	upgrader := websocket.Upgrader{}
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		conn, err := upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			t.Errorf("Upgrade() error = %v", err)
+			return
+		}
+		defer conn.Close()
+		for {
+			var msg PicoMessage
+			if err := conn.ReadJSON(&msg); err != nil {
+				return
+			}
+			received <- msg
+		}
+	}))
+
+	wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
+	clientConn, resp, err := websocket.DefaultDialer.Dial(wsURL, nil)
+	if err != nil {
+		server.Close()
+		t.Fatalf("Dial() error = %v", err)
+	}
+
+	cleanup := func() {
+		clientConn.Close()
+		server.Close()
+	}
+	defer resp.Body.Close()
+	return clientConn, received, cleanup
+}

pkg/channels/pico/protocol.go

@@ -12,6 +12,7 @@ const (
 	// TypeMessageCreate is sent from server to client.
 	TypeMessageCreate = "message.create"
 	TypeMessageUpdate = "message.update"
+	TypeMessageDelete = "message.delete"
 	TypeMediaCreate   = "media.create"
 	TypeTypingStart   = "typing.start"
 	TypeTypingStop    = "typing.stop"

pkg/channels/telegram/command_registration.go

@@ -66,6 +66,10 @@ func (c *TelegramChannel) startCommandRegistration(ctx context.Context, defs []c
 	if register == nil {
 		register = c.RegisterCommands
 	}
+	delayFn := c.commandRegDelayFn
+	if delayFn == nil {
+		delayFn = commandRegistrationDelay
+	}
 
 	regCtx, cancel := context.WithCancel(ctx)
 	c.commandRegCancel = cancel
@@ -91,7 +95,7 @@ func (c *TelegramChannel) startCommandRegistration(ctx context.Context, defs []c
 				return
 			}
 
-			delay := commandRegistrationDelay(attempt)
+			delay := delayFn(attempt)
 			logger.WarnCF("telegram", "Telegram command registration failed; will retry", map[string]any{
 				"error":       err.Error(),
 				"retry_after": delay.String(),

pkg/channels/telegram/command_registration_test.go

@@ -31,14 +31,12 @@ func TestStartCommandRegistration_DoesNotBlock(t *testing.T) {
 }
 
 func TestStartCommandRegistration_RetriesUntilSuccessThenStops(t *testing.T) {
-	ch := &TelegramChannel{}
+	ch := &TelegramChannel{
+		commandRegDelayFn: func(int) time.Duration { return 5 * time.Millisecond },
+	}
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	origBackoff := commandRegistrationBackoff
-	commandRegistrationBackoff = []time.Duration{5 * time.Millisecond}
-	defer func() { commandRegistrationBackoff = origBackoff }()
-
 	var attempts atomic.Int32
 	ch.registerFunc = func(context.Context, []commands.Definition) error {
 		n := attempts.Add(1)
@@ -69,12 +67,10 @@ func TestStartCommandRegistration_RetriesUntilSuccessThenStops(t *testing.T) {
 }
 
 func TestStartCommandRegistration_StopsAfterCancel(t *testing.T) {
-	ch := &TelegramChannel{}
+	ch := &TelegramChannel{
+		commandRegDelayFn: func(int) time.Duration { return 5 * time.Millisecond },
+	}
 	ctx, cancel := context.WithCancel(context.Background())
-
-	origBackoff := commandRegistrationBackoff
-	commandRegistrationBackoff = []time.Duration{5 * time.Millisecond}
-	defer func() { commandRegistrationBackoff = origBackoff }()
 	defer cancel()
 
 	var attempts atomic.Int32

pkg/channels/telegram/telegram.go

@@ -52,8 +52,10 @@ type TelegramChannel struct {
 	ctx      context.Context
 	cancel   context.CancelFunc
 	tgCfg    *config.TelegramSettings
+	progress *channels.ToolFeedbackAnimator
 
 	registerFunc      func(context.Context, []commands.Definition) error
+	commandRegDelayFn func(int) time.Duration
 	commandRegCancel  context.CancelFunc
 }
 
@@ -104,13 +106,15 @@ func NewTelegramChannel(
 		channels.WithReasoningChannelID(bc.ReasoningChannelID),
 	)
 
-	return &TelegramChannel{
+	ch := &TelegramChannel{
 		BaseChannel: base,
 		bot:         bot,
 		bc:          bc,
 		chatIDs:     make(map[string]int64),
 		tgCfg:       telegramCfg,
-	}, nil
+	}
+	ch.progress = channels.NewToolFeedbackAnimator(ch.EditMessage)
+	return ch, nil
 }
 
 func (c *TelegramChannel) Start(ctx context.Context) error {
@@ -168,6 +172,9 @@ func (c *TelegramChannel) Stop(ctx context.Context) error {
 	if c.cancel != nil {
 		c.cancel()
 	}
+	if c.progress != nil {
+		c.progress.StopAll()
+	}
 	if c.commandRegCancel != nil {
 		c.commandRegCancel()
 	}
@@ -191,12 +198,36 @@ func (c *TelegramChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]
 		return nil, nil
 	}
 
+	isToolFeedback := outboundMessageIsToolFeedback(msg)
+	toolFeedbackContent := msg.Content
+	if isToolFeedback {
+		toolFeedbackContent = fitToolFeedbackForTelegram(msg.Content, useMarkdownV2, 4096)
+	}
+	trackedChatID := telegramToolFeedbackChatKey(msg.ChatID, &msg.Context)
+	if isToolFeedback {
+		if msgID, handled, err := c.progress.Update(ctx, trackedChatID, toolFeedbackContent); handled {
+			if err != nil {
+				return nil, err
+			}
+			return []string{msgID}, nil
+		}
+	}
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(trackedChatID)
+	if !isToolFeedback {
+		if msgIDs, handled := c.finalizeToolFeedbackMessageForChat(ctx, trackedChatID, msg); handled {
+			return msgIDs, nil
+		}
+	}
+
 	// The Manager already splits messages to ≤4000 chars (WithMaxMessageLength),
 	// so msg.Content is guaranteed to be within that limit. We still need to
 	// check if HTML expansion pushes it beyond Telegram's 4096-char API limit.
 	replyToID := msg.ReplyToMessageID
 	var messageIDs []string
 	queue := []string{msg.Content}
+	if isToolFeedback {
+		queue = []string{channels.InitialAnimatedToolFeedbackContent(toolFeedbackContent)}
+	}
 	for len(queue) > 0 {
 		chunk := queue[0]
 		queue = queue[1:]
@@ -204,6 +235,13 @@ func (c *TelegramChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]
 		content := parseContent(chunk, useMarkdownV2)
 
 		if len([]rune(content)) > 4096 {
+			if isToolFeedback {
+				fittedChunk := fitToolFeedbackForTelegram(chunk, useMarkdownV2, 4096)
+				if fittedChunk != "" && fittedChunk != chunk {
+					queue = append([]string{fittedChunk}, queue...)
+					continue
+				}
+			}
 			runeChunk := []rune(chunk)
 			ratio := float64(len(runeChunk)) / float64(len([]rune(content)))
 			smallerLen := int(float64(4096) * ratio * 0.95) // 5% safety margin
@@ -270,6 +308,12 @@ func (c *TelegramChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]
 		replyToID = ""
 	}
 
+	if isToolFeedback && len(messageIDs) > 0 {
+		c.RecordToolFeedbackMessage(trackedChatID, messageIDs[0], toolFeedbackContent)
+	} else if !isToolFeedback && hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, trackedChatID, trackedMsgID)
+	}
+
 	return messageIDs, nil
 }
 
@@ -437,6 +481,89 @@ func (c *TelegramChannel) DeleteMessage(ctx context.Context, chatID string, mess
 	})
 }
 
+func outboundMessageIsToolFeedback(msg bus.OutboundMessage) bool {
+	if len(msg.Context.Raw) == 0 {
+		return false
+	}
+	return strings.EqualFold(strings.TrimSpace(msg.Context.Raw["message_kind"]), "tool_feedback")
+}
+
+func (c *TelegramChannel) currentToolFeedbackMessage(chatID string) (string, bool) {
+	if c.progress == nil {
+		return "", false
+	}
+	return c.progress.Current(chatID)
+}
+
+func (c *TelegramChannel) takeToolFeedbackMessage(chatID string) (string, string, bool) {
+	if c.progress == nil {
+		return "", "", false
+	}
+	return c.progress.Take(chatID)
+}
+
+func (c *TelegramChannel) RecordToolFeedbackMessage(chatID, messageID, content string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Record(chatID, messageID, content)
+}
+
+func (c *TelegramChannel) ClearToolFeedbackMessage(chatID string) {
+	if c.progress == nil {
+		return
+	}
+	c.progress.Clear(chatID)
+}
+
+func (c *TelegramChannel) DismissToolFeedbackMessage(ctx context.Context, chatID string) {
+	msgID, ok := c.currentToolFeedbackMessage(chatID)
+	if !ok {
+		return
+	}
+	c.dismissTrackedToolFeedbackMessage(ctx, chatID, msgID)
+}
+
+func (c *TelegramChannel) dismissTrackedToolFeedbackMessage(ctx context.Context, chatID, messageID string) {
+	if strings.TrimSpace(chatID) == "" || strings.TrimSpace(messageID) == "" {
+		return
+	}
+	c.ClearToolFeedbackMessage(chatID)
+	_ = c.DeleteMessage(ctx, chatID, messageID)
+}
+
+func (c *TelegramChannel) finalizeTrackedToolFeedbackMessage(
+	ctx context.Context,
+	chatID string,
+	content string,
+	editFn func(context.Context, string, string, string) error,
+) ([]string, bool) {
+	msgID, baseContent, ok := c.takeToolFeedbackMessage(chatID)
+	if !ok || editFn == nil {
+		return nil, false
+	}
+	if err := editFn(ctx, chatID, msgID, content); err != nil {
+		c.RecordToolFeedbackMessage(chatID, msgID, baseContent)
+		return nil, false
+	}
+	return []string{msgID}, true
+}
+
+func (c *TelegramChannel) FinalizeToolFeedbackMessage(ctx context.Context, msg bus.OutboundMessage) ([]string, bool) {
+	if outboundMessageIsToolFeedback(msg) {
+		return nil, false
+	}
+	return c.finalizeToolFeedbackMessageForChat(ctx, telegramToolFeedbackChatKey(msg.ChatID, &msg.Context), msg)
+}
+
+func (c *TelegramChannel) finalizeToolFeedbackMessageForChat(
+	ctx context.Context,
+	chatID string,
+	msg bus.OutboundMessage,
+) ([]string, bool) {
+	return c.finalizeTrackedToolFeedbackMessage(ctx, chatID, msg.Content, c.EditMessage)
+}
+
 // SendPlaceholder implements channels.PlaceholderCapable.
 // It sends a placeholder message (e.g. "Thinking... 💭") that will later be
 // edited to the actual response via EditMessage (channels.MessageEditor).
@@ -468,6 +595,8 @@ func (c *TelegramChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMe
 	if !c.IsRunning() {
 		return nil, channels.ErrNotRunning
 	}
+	trackedChatID := telegramToolFeedbackChatKey(msg.ChatID, &msg.Context)
+	trackedMsgID, hasTrackedMsg := c.currentToolFeedbackMessage(trackedChatID)
 
 	chatID, threadID, err := resolveTelegramOutboundTarget(msg.ChatID, &msg.Context)
 	if err != nil {
@@ -576,6 +705,10 @@ func (c *TelegramChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMe
 		}
 	}
 
+	if hasTrackedMsg {
+		c.dismissTrackedToolFeedbackMessage(ctx, trackedChatID, trackedMsgID)
+	}
+
 	return messageIDs, nil
 }
 
@@ -947,6 +1080,60 @@ func parseContent(text string, useMarkdownV2 bool) string {
 	return markdownToTelegramHTML(text)
 }
 
+func fitToolFeedbackForTelegram(content string, useMarkdownV2 bool, maxParsedLen int) string {
+	content = strings.TrimSpace(content)
+	if content == "" || maxParsedLen <= 0 {
+		return ""
+	}
+	animationSafeLen := maxParsedLen - channels.MaxToolFeedbackAnimationFrameLength()
+	if animationSafeLen <= 0 {
+		animationSafeLen = maxParsedLen
+	}
+	if len([]rune(parseContent(content, useMarkdownV2))) <= animationSafeLen {
+		return content
+	}
+
+	low := 1
+	high := len([]rune(content))
+	best := utils.Truncate(content, 1)
+
+	for low <= high {
+		mid := (low + high) / 2
+		candidate := utils.FitToolFeedbackMessage(content, mid)
+		if candidate == "" {
+			high = mid - 1
+			continue
+		}
+		if len([]rune(parseContent(candidate, useMarkdownV2))) <= animationSafeLen {
+			best = candidate
+			low = mid + 1
+			continue
+		}
+		high = mid - 1
+	}
+
+	return best
+}
+
+func (c *TelegramChannel) PrepareToolFeedbackMessageContent(content string) string {
+	if c == nil || c.tgCfg == nil {
+		return strings.TrimSpace(content)
+	}
+	return fitToolFeedbackForTelegram(content, c.tgCfg.UseMarkdownV2, 4096)
+}
+
+func telegramToolFeedbackChatKey(chatID string, outboundCtx *bus.InboundContext) string {
+	resolvedChatID, threadID, err := resolveTelegramOutboundTarget(chatID, outboundCtx)
+	if err != nil || threadID == 0 {
+		return strings.TrimSpace(chatID)
+	}
+	return fmt.Sprintf("%d/%d", resolvedChatID, threadID)
+}
+
+func (c *TelegramChannel) ToolFeedbackMessageChatID(chatID string, outboundCtx *bus.InboundContext) string {
+	return telegramToolFeedbackChatKey(chatID, outboundCtx)
+}
+
 // parseTelegramChatID splits "chatID/threadID" into its components.
 // Returns threadID=0 when no "/" is present (non-forum messages).
 func parseTelegramChatID(chatID string) (int64, int, error) {
@@ -1097,7 +1284,7 @@ func (c *TelegramChannel) BeginStream(ctx context.Context, chatID string) (chann
 		return nil, fmt.Errorf("streaming disabled in config")
 	}
 
-	cid, _, err := parseTelegramChatID(chatID)
+	cid, threadID, err := parseTelegramChatID(chatID)
 	if err != nil {
 		return nil, err
 	}
@@ -1106,6 +1293,7 @@ func (c *TelegramChannel) BeginStream(ctx context.Context, chatID string) (chann
 	return &telegramStreamer{
 		bot:              c.bot,
 		chatID:           cid,
+		threadID:         threadID,
 		draftID:          cryptoRandInt(),
 		throttleInterval: time.Duration(streamCfg.ThrottleSeconds) * time.Second,
 		minGrowth:        streamCfg.MinGrowthChars,
@@ -1118,6 +1306,7 @@ func (c *TelegramChannel) BeginStream(ctx context.Context, chatID string) (chann
 type telegramStreamer struct {
 	bot              *telego.Bot
 	chatID           int64
+	threadID         int
 	draftID          int
 	throttleInterval time.Duration
 	minGrowth        int
@@ -1146,6 +1335,7 @@ func (s *telegramStreamer) Update(ctx context.Context, content string) error {
 
 	err := s.bot.SendMessageDraft(ctx, &telego.SendMessageDraftParams{
 		ChatID:          s.chatID,
+		MessageThreadID: s.threadID,
 		DraftID:         s.draftID,
 		Text:            htmlContent,
 		ParseMode:       telego.ModeHTML,
@@ -1167,6 +1357,7 @@ func (s *telegramStreamer) Update(ctx context.Context, content string) error {
 func (s *telegramStreamer) Finalize(ctx context.Context, content string) error {
 	htmlContent := markdownToTelegramHTML(content)
 	tgMsg := tu.Message(tu.ID(s.chatID), htmlContent)
+	tgMsg.MessageThreadID = s.threadID
 	tgMsg.ParseMode = telego.ModeHTML
 
 	if _, err := s.bot.SendMessage(ctx, tgMsg); err != nil {

pkg/channels/telegram/telegram_group_command_filter_test.go

@@ -108,7 +108,7 @@ func TestHandleMessage_GroupMentionOnly_BotCommandEntity(t *testing.T) {
 				t.Fatalf("handleMessage error: %v", err)
 			}
 
-			ctx, cancel := context.WithTimeout(context.Background(), 200*time.Microsecond)
+			ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
 			defer cancel()
 			select {
 			case <-ctx.Done():

pkg/channels/telegram/telegram_test.go

@@ -98,8 +98,12 @@ func (s *multipartRecordingConstructor) MultipartRequest(
 
 // successResponse returns a ta.Response that telego will treat as a successful SendMessage.
 func successResponse(t *testing.T) *ta.Response {
+	return successResponseWithMessageID(t, 1)
+}
+
+func successResponseWithMessageID(t *testing.T, messageID int) *ta.Response {
 	t.Helper()
-	msg := &telego.Message{MessageID: 1}
+	msg := &telego.Message{MessageID: messageID}
 	b, err := json.Marshal(msg)
 	require.NoError(t, err)
 	return &ta.Response{Ok: true, Result: b}
@@ -142,6 +146,7 @@ func newTestChannelWithConstructor(
 		chatIDs:     make(map[string]int64),
 		bc:          &config.Channel{Type: config.ChannelTelegram, Enabled: true},
 		tgCfg:       &config.TelegramSettings{},
+		progress:    channels.NewToolFeedbackAnimator(nil),
 	}
 }
 
@@ -266,6 +271,176 @@ func TestSend_ShortMessage_SingleCall(t *testing.T) {
 	assert.Len(t, caller.calls, 1, "short message should result in exactly one SendMessage call")
 }
 
+func TestSend_NonToolFeedbackDeletesTrackedProgressMessage(t *testing.T) {
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			switch {
+			case strings.Contains(url, "editMessageText"):
+				return successResponseWithMessageID(t, 1), nil
+			default:
+				t.Fatalf("unexpected API call: %s", url)
+				return nil, nil
+			}
+		},
+	}
+	ch := newTestChannel(t, caller)
+	ch.RecordToolFeedbackMessage("12345", "1", "🔧 `read_file`")
+
+	ids, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "12345",
+		Content: "final reply",
+	})
+
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"1"}, ids)
+	require.Len(t, caller.calls, 1)
+	assert.Contains(t, caller.calls[0].URL, "editMessageText")
+	_, ok := ch.currentToolFeedbackMessage("12345")
+	assert.False(t, ok, "tracked tool feedback should be cleared after final reply")
+}
+
+func TestSend_ToolFeedbackTrackingIsTopicScoped(t *testing.T) {
+	nextMessageID := 0
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			nextMessageID++
+			return successResponseWithMessageID(t, nextMessageID), nil
+		},
+	}
+	ch := newTestChannel(t, caller)
+
+	_, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "-1001234567890",
+		Content: "🔧 `read_file`",
+		Context: bus.InboundContext{
+			Channel: "telegram",
+			ChatID:  "-1001234567890",
+			TopicID: "42",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+	require.NoError(t, err)
+
+	_, ok := ch.currentToolFeedbackMessage("-1001234567890")
+	assert.False(t, ok, "base chat should not track topic-specific tool feedback")
+
+	msgID, ok := ch.currentToolFeedbackMessage("-1001234567890/42")
+	require.True(t, ok, "topic chat should track tool feedback")
+	assert.Equal(t, "1", msgID)
+}
+
+func TestSend_TopicReplyDoesNotFinalizeDifferentTopicToolFeedback(t *testing.T) {
+	nextMessageID := 0
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			nextMessageID++
+			return successResponseWithMessageID(t, nextMessageID), nil
+		},
+	}
+	ch := newTestChannel(t, caller)
+
+	_, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "-1001234567890",
+		Content: "🔧 `read_file`",
+		Context: bus.InboundContext{
+			Channel: "telegram",
+			ChatID:  "-1001234567890",
+			TopicID: "42",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+	require.NoError(t, err)
+
+	ids, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "-1001234567890",
+		Content: "final reply in another topic",
+		Context: bus.InboundContext{
+			Channel: "telegram",
+			ChatID:  "-1001234567890",
+			TopicID: "43",
+		},
+	})
+	require.NoError(t, err)
+	require.Len(t, caller.calls, 2)
+	assert.Equal(t, []string{"2"}, ids)
+	assert.Contains(t, caller.calls[1].URL, "sendMessage")
+	assert.NotContains(t, caller.calls[1].URL, "editMessageText")
+
+	_, ok := ch.currentToolFeedbackMessage("-1001234567890/42")
+	assert.True(t, ok, "tool feedback in the original topic should remain tracked")
+}
+
+func TestFinalizeTrackedToolFeedbackMessage_StopsTrackingBeforeEdit(t *testing.T) {
+	ch := newTestChannel(t, &stubCaller{
+		callFn: func(context.Context, string, *ta.RequestData) (*ta.Response, error) {
+			t.Fatal("unexpected API call")
+			return nil, nil
+		},
+	})
+	ch.RecordToolFeedbackMessage("12345", "1", "🔧 `read_file`")
+
+	msgIDs, handled := ch.finalizeTrackedToolFeedbackMessage(
+		context.Background(),
+		"12345",
+		"final reply",
+		func(_ context.Context, chatID, messageID, content string) error {
+			_, ok := ch.currentToolFeedbackMessage(chatID)
+			assert.False(t, ok, "tracked tool feedback should be stopped before edit")
+			assert.Equal(t, "12345", chatID)
+			assert.Equal(t, "1", messageID)
+			assert.Equal(t, "final reply", content)
+			return nil
+		},
+	)
+
+	assert.True(t, handled)
+	assert.Equal(t, []string{"1"}, msgIDs)
+}
+
+func TestSend_ToolFeedbackStaysSingleMessageAfterHTMLExpansion(t *testing.T) {
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			return successResponse(t), nil
+		},
+	}
+	ch := newTestChannel(t, caller)
+
+	_, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "12345",
+		Content: "🔧 `read_file`\n" + strings.Repeat("<", 2000),
+		Context: bus.InboundContext{
+			Channel: "telegram",
+			ChatID:  "12345",
+			Raw: map[string]string{
+				"message_kind": "tool_feedback",
+			},
+		},
+	})
+
+	assert.NoError(t, err)
+	assert.Len(t, caller.calls, 1, "tool feedback should stay a single Telegram message after HTML escaping")
+}
+
+func TestFitToolFeedbackForTelegram_ReservesAnimationFrame(t *testing.T) {
+	content := "🔧 `read_file`\n" + strings.Repeat("a", 4096)
+
+	fitted := fitToolFeedbackForTelegram(content, false, 4096)
+	animated := strings.Replace(
+		fitted,
+		"`\n",
+		strings.Repeat(".", channels.MaxToolFeedbackAnimationFrameLength())+"`\n",
+		1,
+	)
+
+	if got := len([]rune(parseContent(animated, false))); got > 4096 {
+		t.Fatalf("animated parsed length = %d, want <= 4096", got)
+	}
+}
+
 func TestSend_LongMessage_SingleCall(t *testing.T) {
 	// With WithMaxMessageLength(4000), the Manager pre-splits messages before
 	// they reach Send(). A message at exactly 4000 chars should go through
@@ -560,6 +735,58 @@ func TestSend_UsesContextTopicIDWhenChatIDDoesNotIncludeThread(t *testing.T) {
 	assert.Equal(t, "Hello from topic context", params.Text)
 }
 
+func TestBeginStream_UpdateUsesForumThreadID(t *testing.T) {
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			return &ta.Response{Ok: true, Result: []byte("true")}, nil
+		},
+	}
+	ch := newTestChannel(t, caller)
+	ch.tgCfg.Streaming.Enabled = true
+
+	streamer, err := ch.BeginStream(context.Background(), "-1001234567890/42")
+	require.NoError(t, err)
+	require.NoError(t, streamer.Update(context.Background(), "partial"))
+	require.Len(t, caller.calls, 1)
+	assert.Contains(t, caller.calls[0].URL, "sendMessageDraft")
+
+	var params struct {
+		ChatID          int64  `json:"chat_id"`
+		MessageThreadID int    `json:"message_thread_id"`
+		Text            string `json:"text"`
+	}
+	require.NoError(t, json.Unmarshal(caller.calls[0].Data.BodyRaw, &params))
+	assert.Equal(t, int64(-1001234567890), params.ChatID)
+	assert.Equal(t, 42, params.MessageThreadID)
+	assert.Equal(t, "partial", params.Text)
+}
+
+func TestBeginStream_FinalizeUsesForumThreadID(t *testing.T) {
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			return successResponse(t), nil
+		},
+	}
+	ch := newTestChannel(t, caller)
+	ch.tgCfg.Streaming.Enabled = true
+
+	streamer, err := ch.BeginStream(context.Background(), "-1001234567890/42")
+	require.NoError(t, err)
+	require.NoError(t, streamer.Finalize(context.Background(), "final"))
+	require.Len(t, caller.calls, 1)
+	assert.Contains(t, caller.calls[0].URL, "sendMessage")
+
+	var params struct {
+		ChatID          int64  `json:"chat_id"`
+		MessageThreadID int    `json:"message_thread_id"`
+		Text            string `json:"text"`
+	}
+	require.NoError(t, json.Unmarshal(caller.calls[0].Data.BodyRaw, &params))
+	assert.Equal(t, int64(-1001234567890), params.ChatID)
+	assert.Equal(t, 42, params.MessageThreadID)
+	assert.Equal(t, "final", params.Text)
+}
+
 func TestHandleMessage_ForumTopic_SetsMetadata(t *testing.T) {
 	messageBus := bus.NewMessageBus()
 	ch := &TelegramChannel{

pkg/channels/tool_feedback_animator.go

@@ -0,0 +1,240 @@
+package channels
+
+import (
+	"context"
+	"strings"
+	"sync"
+	"time"
+)
+
+const toolFeedbackAnimationInterval = 3 * time.Second
+
+const initialToolFeedbackAnimationFrame = ""
+
+var toolFeedbackAnimationFrames = []string{"..", "."}
+
+// MaxToolFeedbackAnimationFrameLength returns the largest frame suffix length
+// so callers can reserve room before sending messages to length-limited APIs.
+func MaxToolFeedbackAnimationFrameLength() int {
+	maxLen := len([]rune(initialToolFeedbackAnimationFrame))
+	for _, frame := range toolFeedbackAnimationFrames {
+		if frameLen := len([]rune(frame)); frameLen > maxLen {
+			maxLen = frameLen
+		}
+	}
+	return maxLen
+}
+
+type toolFeedbackAnimationState struct {
+	messageID   string
+	baseContent string
+	stop        chan struct{}
+	done        chan struct{}
+}
+
+type ToolFeedbackAnimator struct {
+	mu      sync.Mutex
+	editFn  func(ctx context.Context, chatID, messageID, content string) error
+	entries map[string]*toolFeedbackAnimationState
+}
+
+func NewToolFeedbackAnimator(
+	editFn func(ctx context.Context, chatID, messageID, content string) error,
+) *ToolFeedbackAnimator {
+	return &ToolFeedbackAnimator{
+		editFn:  editFn,
+		entries: make(map[string]*toolFeedbackAnimationState),
+	}
+}
+
+func (a *ToolFeedbackAnimator) Current(chatID string) (string, bool) {
+	if a == nil || strings.TrimSpace(chatID) == "" {
+		return "", false
+	}
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	entry, ok := a.entries[chatID]
+	if !ok || strings.TrimSpace(entry.messageID) == "" {
+		return "", false
+	}
+	return entry.messageID, true
+}
+
+func (a *ToolFeedbackAnimator) Record(chatID, messageID, content string) {
+	if a == nil {
+		return
+	}
+	chatID = strings.TrimSpace(chatID)
+	messageID = strings.TrimSpace(messageID)
+	content = strings.TrimSpace(content)
+	if chatID == "" || messageID == "" || content == "" {
+		return
+	}
+
+	entry := &toolFeedbackAnimationState{
+		messageID:   messageID,
+		baseContent: content,
+		stop:        make(chan struct{}),
+		done:        make(chan struct{}),
+	}
+
+	var previous *toolFeedbackAnimationState
+	a.mu.Lock()
+	if old, ok := a.entries[chatID]; ok {
+		previous = old
+	}
+	a.entries[chatID] = entry
+	a.mu.Unlock()
+
+	stopToolFeedbackAnimation(previous)
+	go a.run(chatID, entry)
+}
+
+func (a *ToolFeedbackAnimator) Clear(chatID string) {
+	if a == nil || strings.TrimSpace(chatID) == "" {
+		return
+	}
+	entry := a.detach(chatID)
+	stopToolFeedbackAnimation(entry)
+}
+
+func (a *ToolFeedbackAnimator) Take(chatID string) (string, string, bool) {
+	if a == nil || strings.TrimSpace(chatID) == "" {
+		return "", "", false
+	}
+	entry := a.detach(chatID)
+	if entry == nil || strings.TrimSpace(entry.messageID) == "" {
+		return "", "", false
+	}
+	stopToolFeedbackAnimation(entry)
+	return entry.messageID, entry.baseContent, true
+}
+
+// Update edits an existing tracked feedback message. If the edit fails, the
+// previous feedback state is restored so callers can retry without orphaning
+// the old progress message.
+func (a *ToolFeedbackAnimator) Update(ctx context.Context, chatID, content string) (string, bool, error) {
+	if a == nil || a.editFn == nil {
+		return "", false, nil
+	}
+	msgID, baseContent, ok := a.Take(chatID)
+	if !ok {
+		return "", false, nil
+	}
+
+	animatedContent := InitialAnimatedToolFeedbackContent(content)
+	if err := a.editFn(ctx, strings.TrimSpace(chatID), msgID, animatedContent); err != nil {
+		a.Record(chatID, msgID, baseContent)
+		return "", true, err
+	}
+
+	a.Record(chatID, msgID, content)
+	return msgID, true, nil
+}
+
+func (a *ToolFeedbackAnimator) StopAll() {
+	if a == nil {
+		return
+	}
+	a.mu.Lock()
+	entries := make([]*toolFeedbackAnimationState, 0, len(a.entries))
+	for chatID, entry := range a.entries {
+		entries = append(entries, entry)
+		delete(a.entries, chatID)
+	}
+	a.mu.Unlock()
+
+	for _, entry := range entries {
+		stopToolFeedbackAnimation(entry)
+	}
+}
+
+func (a *ToolFeedbackAnimator) detach(chatID string) *toolFeedbackAnimationState {
+	if a == nil || strings.TrimSpace(chatID) == "" {
+		return nil
+	}
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	entry := a.entries[chatID]
+	delete(a.entries, chatID)
+	return entry
+}
+
+func (a *ToolFeedbackAnimator) run(chatID string, entry *toolFeedbackAnimationState) {
+	defer close(entry.done)
+
+	ticker := time.NewTicker(toolFeedbackAnimationInterval)
+	defer ticker.Stop()
+
+	frameIdx := 1
+
+	for {
+		select {
+		case <-entry.stop:
+			return
+		case <-ticker.C:
+			if a.editFn == nil {
+				continue
+			}
+			frame := toolFeedbackAnimationFrames[frameIdx%len(toolFeedbackAnimationFrames)]
+			content := formatAnimatedToolFeedbackContent(entry.baseContent, frame)
+			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+			_ = a.editFn(ctx, chatID, entry.messageID, content)
+			cancel()
+			frameIdx++
+		}
+	}
+}
+
+func InitialAnimatedToolFeedbackContent(baseContent string) string {
+	return formatAnimatedToolFeedbackContent(baseContent, initialToolFeedbackAnimationFrame)
+}
+
+func formatAnimatedToolFeedbackContent(baseContent, frame string) string {
+	baseContent = strings.TrimSpace(baseContent)
+	frame = strings.TrimSpace(frame)
+	if baseContent == "" {
+		return ""
+	}
+	if frame == "" {
+		return baseContent
+	}
+	lineBreak := strings.IndexByte(baseContent, '\n')
+	if lineBreak < 0 {
+		return appendToolFeedbackFrame(baseContent, frame)
+	}
+	return appendToolFeedbackFrame(baseContent[:lineBreak], frame) + baseContent[lineBreak:]
+}
+
+func appendToolFeedbackFrame(firstLine, frame string) string {
+	firstLine = strings.TrimSpace(firstLine)
+	frame = strings.TrimSpace(frame)
+	if firstLine == "" {
+		return ""
+	}
+	if frame == "" {
+		return firstLine
+	}
+
+	openTick := strings.IndexByte(firstLine, '`')
+	if openTick >= 0 {
+		if closeOffset := strings.IndexByte(firstLine[openTick+1:], '`'); closeOffset >= 0 {
+			closeTick := openTick + 1 + closeOffset
+			return firstLine[:closeTick] + frame + firstLine[closeTick:]
+		}
+	}
+
+	return firstLine + frame
+}
+
+func stopToolFeedbackAnimation(entry *toolFeedbackAnimationState) {
+	if entry == nil {
+		return
+	}
+	select {
+	case <-entry.stop:
+	default:
+		close(entry.stop)
+	}
+	<-entry.done
+}

pkg/channels/tool_feedback_animator_test.go

@@ -0,0 +1,121 @@
+package channels
+
+import (
+	"context"
+	"errors"
+	"testing"
+)
+
+func TestFormatAnimatedToolFeedbackContent(t *testing.T) {
+	got := formatAnimatedToolFeedbackContent("🔧 `read_file`\nReading config file", "running..")
+	want := "🔧 `read_filerunning..`\nReading config file"
+	if got != want {
+		t.Fatalf("formatAnimatedToolFeedbackContent() = %q, want %q", got, want)
+	}
+}
+
+func TestInitialAnimatedToolFeedbackContent(t *testing.T) {
+	got := InitialAnimatedToolFeedbackContent("🔧 `exec`\nRunning command")
+	want := "🔧 `exec`\nRunning command"
+	if got != want {
+		t.Fatalf("InitialAnimatedToolFeedbackContent() = %q, want %q", got, want)
+	}
+}
+
+func TestFormatAnimatedToolFeedbackContent_WithoutCodeSpan(t *testing.T) {
+	got := formatAnimatedToolFeedbackContent("hello", "running..")
+	want := "hellorunning.."
+	if got != want {
+		t.Fatalf("formatAnimatedToolFeedbackContent() without code span = %q, want %q", got, want)
+	}
+}
+
+func TestToolFeedbackAnimator_RecordCurrentAndClear(t *testing.T) {
+	animator := NewToolFeedbackAnimator(nil)
+	animator.Record("chat-1", "msg-1", "🔧 `read_file`")
+
+	msgID, ok := animator.Current("chat-1")
+	if !ok || msgID != "msg-1" {
+		t.Fatalf("Current() = (%q, %v), want (msg-1, true)", msgID, ok)
+	}
+
+	animator.Clear("chat-1")
+
+	msgID, ok = animator.Current("chat-1")
+	if ok || msgID != "" {
+		t.Fatalf("Current() after Clear = (%q, %v), want (\"\", false)", msgID, ok)
+	}
+}
+
+func TestToolFeedbackAnimator_TakeStopsTrackingAndReturnsState(t *testing.T) {
+	animator := NewToolFeedbackAnimator(nil)
+	animator.Record("chat-1", "msg-1", "🔧 `read_file`\nChecking config")
+
+	msgID, baseContent, ok := animator.Take("chat-1")
+	if !ok {
+		t.Fatal("Take() = not found, want tracked message")
+	}
+	if msgID != "msg-1" {
+		t.Fatalf("Take() msgID = %q, want msg-1", msgID)
+	}
+	if baseContent != "🔧 `read_file`\nChecking config" {
+		t.Fatalf("Take() baseContent = %q", baseContent)
+	}
+	if _, ok := animator.Current("chat-1"); ok {
+		t.Fatal("expected tracked message to be removed after Take()")
+	}
+}
+
+func TestToolFeedbackAnimator_UpdateStopsTrackingBeforeEdit(t *testing.T) {
+	var animator *ToolFeedbackAnimator
+	animator = NewToolFeedbackAnimator(func(_ context.Context, chatID, messageID, content string) error {
+		if _, ok := animator.Current(chatID); ok {
+			t.Fatal("expected tracked tool feedback to be stopped before edit")
+		}
+		if messageID != "msg-1" {
+			t.Fatalf("messageID = %q, want msg-1", messageID)
+		}
+		if content != "🔧 `write_file`\nUpdating config" {
+			t.Fatalf("content = %q, want updated animated content", content)
+		}
+		return nil
+	})
+	defer animator.StopAll()
+
+	animator.Record("chat-1", "msg-1", "🔧 `read_file`\nChecking config")
+
+	msgID, handled, err := animator.Update(context.Background(), "chat-1", "🔧 `write_file`\nUpdating config")
+	if err != nil {
+		t.Fatalf("Update() error = %v", err)
+	}
+	if !handled {
+		t.Fatal("Update() handled = false, want true")
+	}
+	if msgID != "msg-1" {
+		t.Fatalf("Update() msgID = %q, want msg-1", msgID)
+	}
+}
+
+func TestToolFeedbackAnimator_UpdateFailureRestoresTracking(t *testing.T) {
+	editErr := errors.New("edit failed")
+	animator := NewToolFeedbackAnimator(func(context.Context, string, string, string) error {
+		return editErr
+	})
+	defer animator.StopAll()
+
+	animator.Record("chat-1", "msg-1", "🔧 `read_file`\nChecking config")
+
+	msgID, handled, err := animator.Update(context.Background(), "chat-1", "🔧 `write_file`\nUpdating config")
+	if !handled {
+		t.Fatal("Update() handled = false, want true")
+	}
+	if !errors.Is(err, editErr) {
+		t.Fatalf("Update() error = %v, want editErr", err)
+	}
+	if msgID != "" {
+		t.Fatalf("Update() msgID = %q, want empty on failed edit", msgID)
+	}
+	if currentID, ok := animator.Current("chat-1"); !ok || currentID != "msg-1" {
+		t.Fatalf("Current() after failed Update = (%q, %v), want (msg-1, true)", currentID, ok)
+	}
+}

pkg/config/config.go

@@ -286,7 +286,7 @@ func (d *AgentDefaults) GetMaxMediaSize() int {
 	return DefaultMaxMediaSize
 }
 
-// GetToolFeedbackMaxArgsLength returns the max args preview length for tool feedback messages.
+// GetToolFeedbackMaxArgsLength returns the max visible text length for tool feedback messages.
 func (d *AgentDefaults) GetToolFeedbackMaxArgsLength() int {
 	if d.ToolFeedback.MaxArgsLength > 0 {
 		return d.ToolFeedback.MaxArgsLength

pkg/providers/cli/toolcall_utils.go

@@ -55,6 +55,12 @@ func buildCLIToolsPrompt(tools []ToolDefinition) string {
 func NormalizeToolCall(tc ToolCall) ToolCall {
 	normalized := tc
 
+	if normalized.ThoughtSignature == "" &&
+		normalized.ExtraContent != nil &&
+		normalized.ExtraContent.Google != nil {
+		normalized.ThoughtSignature = normalized.ExtraContent.Google.ThoughtSignature
+	}
+
 	// Ensure Name is populated from Function if not set
 	if normalized.Name == "" && normalized.Function != nil {
 		normalized.Name = normalized.Function.Name
@@ -79,6 +85,7 @@ func NormalizeToolCall(tc ToolCall) ToolCall {
 		normalized.Function = &FunctionCall{
 			Name:             normalized.Name,
 			Arguments:        string(argsJSON),
+			ThoughtSignature: normalized.ThoughtSignature,
 		}
 	} else {
 		if normalized.Function.Name == "" {
@@ -90,6 +97,12 @@ func NormalizeToolCall(tc ToolCall) ToolCall {
 		if normalized.Function.Arguments == "" {
 			normalized.Function.Arguments = string(argsJSON)
 		}
+		if normalized.Function.ThoughtSignature == "" {
+			normalized.Function.ThoughtSignature = normalized.ThoughtSignature
+		}
+		if normalized.ThoughtSignature == "" {
+			normalized.ThoughtSignature = normalized.Function.ThoughtSignature
+		}
 	}
 
 	return normalized

pkg/providers/common/common.go

@@ -73,10 +73,22 @@ type openaiMessage struct {
 	Role             string           `json:"role"`
 	Content          string           `json:"content"`
 	ReasoningContent string           `json:"reasoning_content,omitempty"`
-	ToolCalls        []ToolCall `json:"tool_calls,omitempty"`
+	ToolCalls        []openaiToolCall `json:"tool_calls,omitempty"`
 	ToolCallID       string           `json:"tool_call_id,omitempty"`
 }
 
+type openaiToolCall struct {
+	ID       string              `json:"id"`
+	Type     string              `json:"type,omitempty"`
+	Function *openaiFunctionCall `json:"function,omitempty"`
+}
+
+type openaiFunctionCall struct {
+	Name             string `json:"name"`
+	Arguments        string `json:"arguments"`
+	ThoughtSignature string `json:"thought_signature,omitempty"`
+}
+
 // SerializeMessages converts internal Message structs to the OpenAI wire format.
 //   - Strips SystemParts (unknown to third-party endpoints)
 //   - Converts messages with Media to multipart content format (text + image_url parts)
@@ -84,12 +96,13 @@ type openaiMessage struct {
 func SerializeMessages(messages []Message) []any {
 	out := make([]any, 0, len(messages))
 	for _, m := range messages {
+		toolCalls := serializeToolCalls(m.ToolCalls)
 		if len(m.Media) == 0 {
 			out = append(out, openaiMessage{
 				Role:             m.Role,
 				Content:          m.Content,
 				ReasoningContent: m.ReasoningContent,
-				ToolCalls:        m.ToolCalls,
+				ToolCalls:        toolCalls,
 				ToolCallID:       m.ToolCallID,
 			})
 			continue
@@ -132,8 +145,8 @@ func SerializeMessages(messages []Message) []any {
 		if m.ToolCallID != "" {
 			msg["tool_call_id"] = m.ToolCallID
 		}
-		if len(m.ToolCalls) > 0 {
+		if len(toolCalls) > 0 {
-			msg["tool_calls"] = m.ToolCalls
+			msg["tool_calls"] = toolCalls
 		}
 		if m.ReasoningContent != "" {
 			msg["reasoning_content"] = m.ReasoningContent
@@ -143,6 +156,55 @@ func SerializeMessages(messages []Message) []any {
 	return out
 }
 
+func serializeToolCalls(toolCalls []ToolCall) []openaiToolCall {
+	if len(toolCalls) == 0 {
+		return nil
+	}
+
+	out := make([]openaiToolCall, 0, len(toolCalls))
+	for _, tc := range toolCalls {
+		wireCall := openaiToolCall{
+			ID:   tc.ID,
+			Type: tc.Type,
+		}
+
+		if tc.Function != nil {
+			thoughtSignature := tc.Function.ThoughtSignature
+			if thoughtSignature == "" {
+				thoughtSignature = tc.ThoughtSignature
+			}
+			if thoughtSignature == "" && tc.ExtraContent != nil && tc.ExtraContent.Google != nil {
+				thoughtSignature = tc.ExtraContent.Google.ThoughtSignature
+			}
+			wireCall.Function = &openaiFunctionCall{
+				Name:             tc.Function.Name,
+				Arguments:        tc.Function.Arguments,
+				ThoughtSignature: thoughtSignature,
+			}
+		} else if tc.Name != "" || len(tc.Arguments) > 0 || tc.ThoughtSignature != "" {
+			thoughtSignature := tc.ThoughtSignature
+			if thoughtSignature == "" && tc.ExtraContent != nil && tc.ExtraContent.Google != nil {
+				thoughtSignature = tc.ExtraContent.Google.ThoughtSignature
+			}
+			argsJSON := "{}"
+			if len(tc.Arguments) > 0 {
+				if encoded, err := json.Marshal(tc.Arguments); err == nil {
+					argsJSON = string(encoded)
+				}
+			}
+			wireCall.Function = &openaiFunctionCall{
+				Name:             tc.Name,
+				Arguments:        argsJSON,
+				ThoughtSignature: thoughtSignature,
+			}
+		}
+
+		out = append(out, wireCall)
+	}
+
+	return out
+}
+
 func parseDataAudioURL(mediaURL string) (format, data string, ok bool) {
 	if !strings.HasPrefix(mediaURL, "data:audio/") {
 		return "", "", false
@@ -180,11 +242,13 @@ func ParseResponse(body io.Reader) (*LLMResponse, error) {
 					Function *struct {
 						Name             string          `json:"name"`
 						Arguments        json.RawMessage `json:"arguments"`
+						ThoughtSignature string          `json:"thought_signature"`
 					} `json:"function"`
 					ExtraContent *struct {
 						Google *struct {
 							ThoughtSignature string `json:"thought_signature"`
 						} `json:"google"`
+						ToolFeedbackExplanation string `json:"tool_feedback_explanation"`
 					} `json:"extra_content"`
 				} `json:"tool_calls"`
 			} `json:"message"`
@@ -210,9 +274,11 @@ func ParseResponse(body io.Reader) (*LLMResponse, error) {
 		arguments := make(map[string]any)
 		name := ""
 
-		// Extract thought_signature from Gemini/Google-specific extra content
 		thoughtSignature := ""
-		if tc.ExtraContent != nil && tc.ExtraContent.Google != nil {
+		if tc.Function != nil {
+			thoughtSignature = tc.Function.ThoughtSignature
+		}
+		if thoughtSignature == "" && tc.ExtraContent != nil && tc.ExtraContent.Google != nil {
 			thoughtSignature = tc.ExtraContent.Google.ThoughtSignature
 		}
 
@@ -228,11 +294,20 @@ func ParseResponse(body io.Reader) (*LLMResponse, error) {
 			ThoughtSignature: thoughtSignature,
 		}
 
+		if thoughtSignature != "" || tc.ExtraContent != nil {
+			extraContent := &ExtraContent{
+				ToolFeedbackExplanation: "",
+			}
+			if tc.ExtraContent != nil {
+				extraContent.ToolFeedbackExplanation = tc.ExtraContent.ToolFeedbackExplanation
+			}
 			if thoughtSignature != "" {
-			toolCall.ExtraContent = &ExtraContent{
+				extraContent.Google = &GoogleExtra{
-				Google: &GoogleExtra{
 					ThoughtSignature: thoughtSignature,
-				},
+				}
+			}
+			if extraContent.Google != nil || strings.TrimSpace(extraContent.ToolFeedbackExplanation) != "" {
+				toolCall.ExtraContent = extraContent
 			}
 		}
 

pkg/providers/common/common_test.go

@@ -162,6 +162,104 @@ func TestSerializeMessages_StripsSystemParts(t *testing.T) {
 	}
 }
 
+func TestSerializeMessages_StripsInternalToolCallExtraContent(t *testing.T) {
+	messages := []Message{
+		{
+			Role: "assistant",
+			ToolCalls: []ToolCall{{
+				ID:   "call_1",
+				Type: "function",
+				Function: &FunctionCall{
+					Name:             "read_file",
+					Arguments:        `{"path":"README.md"}`,
+					ThoughtSignature: "sig-1",
+				},
+				ExtraContent: &ExtraContent{
+					Google: &GoogleExtra{
+						ThoughtSignature: "sig-ignored-here",
+					},
+					ToolFeedbackExplanation: "Read README.md first.",
+				},
+			}},
+		},
+	}
+
+	result := SerializeMessages(messages)
+
+	data, err := json.Marshal(result)
+	if err != nil {
+		t.Fatalf("json.Marshal() error = %v", err)
+	}
+	payload := string(data)
+	if strings.Contains(payload, "extra_content") {
+		t.Fatalf("serialized payload should not include internal extra_content: %s", payload)
+	}
+	if !strings.Contains(payload, "thought_signature") {
+		t.Fatalf("serialized payload should preserve function thought_signature: %s", payload)
+	}
+}
+
+func TestSerializeMessages_PreservesTopLevelThoughtSignature(t *testing.T) {
+	messages := []Message{
+		{
+			Role: "assistant",
+			ToolCalls: []ToolCall{{
+				ID:               "call_1",
+				Type:             "function",
+				ThoughtSignature: "sig-1",
+				Function: &FunctionCall{
+					Name:      "read_file",
+					Arguments: `{"path":"README.md"}`,
+				},
+			}},
+		},
+	}
+
+	result := SerializeMessages(messages)
+
+	data, err := json.Marshal(result)
+	if err != nil {
+		t.Fatalf("json.Marshal() error = %v", err)
+	}
+	payload := string(data)
+	if !strings.Contains(payload, `"thought_signature":"sig-1"`) {
+		t.Fatalf("serialized payload should preserve top-level thought signature: %s", payload)
+	}
+}
+
+func TestSerializeMessages_PreservesGoogleExtraThoughtSignature(t *testing.T) {
+	messages := []Message{
+		{
+			Role: "assistant",
+			ToolCalls: []ToolCall{{
+				ID:   "call_1",
+				Type: "function",
+				Function: &FunctionCall{
+					Name:      "read_file",
+					Arguments: `{"path":"README.md"}`,
+				},
+				ExtraContent: &ExtraContent{
+					Google: &GoogleExtra{ThoughtSignature: "sig-1"},
+				},
+			}},
+		},
+	}
+
+	result := SerializeMessages(messages)
+
+	data, err := json.Marshal(result)
+	if err != nil {
+		t.Fatalf("json.Marshal() error = %v", err)
+	}
+	payload := string(data)
+	if strings.Contains(payload, "extra_content") {
+		t.Fatalf("serialized payload should not include extra_content: %s", payload)
+	}
+	if !strings.Contains(payload, `"thought_signature":"sig-1"`) {
+		t.Fatalf("serialized payload should preserve google thought signature: %s", payload)
+	}
+}
+
 // --- ParseResponse tests ---
 
 func TestParseResponse_BasicContent(t *testing.T) {
@@ -234,6 +332,27 @@ func TestParseResponse_WithReasoningContent(t *testing.T) {
 	}
 }
 
+func TestParseResponse_WithToolFeedbackExplanationExtraContent(t *testing.T) {
+	body := `{"choices":[{"message":{"content":"","tool_calls":[{"id":"call_1","type":"function","function":{"name":"test_tool","arguments":"{}"},"extra_content":{"tool_feedback_explanation":"Check the current config before editing."}}]},"finish_reason":"tool_calls"}]}`
+	out, err := ParseResponse(strings.NewReader(body))
+	if err != nil {
+		t.Fatalf("ParseResponse() error = %v", err)
+	}
+	if len(out.ToolCalls) != 1 {
+		t.Fatalf("len(ToolCalls) = %d, want 1", len(out.ToolCalls))
+	}
+	if out.ToolCalls[0].ExtraContent == nil {
+		t.Fatal("ExtraContent is nil")
+	}
+	if out.ToolCalls[0].ExtraContent.ToolFeedbackExplanation != "Check the current config before editing." {
+		t.Fatalf(
+			"ToolFeedbackExplanation = %q, want %q",
+			out.ToolCalls[0].ExtraContent.ToolFeedbackExplanation,
+			"Check the current config before editing.",
+		)
+	}
+}
+
 func TestParseResponse_InvalidJSON(t *testing.T) {
 	_, err := ParseResponse(strings.NewReader("not json"))
 	if err == nil {
@@ -626,3 +745,27 @@ func TestParseResponse_WithThoughtSignature(t *testing.T) {
 			out.ToolCalls[0].ExtraContent.Google.ThoughtSignature, "sig123")
 	}
 }
+
+func TestParseResponse_WithFunctionThoughtSignature(t *testing.T) {
+	body := `{"choices":[{"message":{"content":"","tool_calls":[{"id":"call_1","type":"function","function":{"name":"test_tool","arguments":"{}","thought_signature":"sig456"}}]},"finish_reason":"tool_calls"}]}`
+	out, err := ParseResponse(strings.NewReader(body))
+	if err != nil {
+		t.Fatalf("ParseResponse() error = %v", err)
+	}
+	if len(out.ToolCalls) != 1 {
+		t.Fatalf("len(ToolCalls) = %d, want 1", len(out.ToolCalls))
+	}
+	if out.ToolCalls[0].ThoughtSignature != "sig456" {
+		t.Fatalf("ThoughtSignature = %q, want %q", out.ToolCalls[0].ThoughtSignature, "sig456")
+	}
+	if out.ToolCalls[0].ExtraContent == nil || out.ToolCalls[0].ExtraContent.Google == nil {
+		t.Fatal("ExtraContent.Google is nil")
+	}
+	if out.ToolCalls[0].ExtraContent.Google.ThoughtSignature != "sig456" {
+		t.Fatalf(
+			"ExtraContent.Google.ThoughtSignature = %q, want %q",
+			out.ToolCalls[0].ExtraContent.Google.ThoughtSignature,
+			"sig456",
+		)
+	}
+}

pkg/providers/protocoltypes/types.go

@@ -12,6 +12,7 @@ type ToolCall struct {
 
 type ExtraContent struct {
 	Google                  *GoogleExtra `json:"google,omitempty"`
+	ToolFeedbackExplanation string       `json:"tool_feedback_explanation,omitempty"`
 }
 
 type GoogleExtra struct {

pkg/providers/toolcall_utils_test.go

@@ -0,0 +1,24 @@
+package providers
+
+import "testing"
+
+func TestNormalizeToolCall_PreservesExtraContentGoogleThoughtSignature(t *testing.T) {
+	tc := NormalizeToolCall(ToolCall{
+		ID:        "call_1",
+		Name:      "search",
+		Arguments: map[string]any{"q": "pico"},
+		ExtraContent: &ExtraContent{
+			Google: &GoogleExtra{ThoughtSignature: "sig-1"},
+		},
+	})
+
+	if tc.ThoughtSignature != "sig-1" {
+		t.Fatalf("ThoughtSignature = %q, want sig-1", tc.ThoughtSignature)
+	}
+	if tc.Function == nil {
+		t.Fatal("Function is nil")
+	}
+	if tc.Function.ThoughtSignature != "sig-1" {
+		t.Fatalf("Function.ThoughtSignature = %q, want sig-1", tc.Function.ThoughtSignature)
+	}
+}

pkg/utils/tool_feedback.go

@@ -1,9 +1,57 @@
 package utils
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
-// FormatToolFeedbackMessage renders the tool name and arguments preview in the
+const ToolFeedbackContinuationHint = "Continuing the current task."
-// same markdown shape used by live tool feedback and session reconstruction.
+
-func FormatToolFeedbackMessage(toolName, argsPreview string) string {
+// FormatToolFeedbackMessage renders the model-provided explanation for why a
-	return fmt.Sprintf("\U0001f527 `%s`\n```\n%s\n```", toolName, argsPreview)
+// tool is being executed. When the model does not provide one, it keeps only
+// the tool line and does not expose raw arguments or fallback text.
+func FormatToolFeedbackMessage(toolName, explanation string) string {
+	toolName = strings.TrimSpace(toolName)
+	explanation = strings.TrimSpace(explanation)
+
+	if toolName == "" {
+		return explanation
+	}
+	if explanation == "" {
+		return fmt.Sprintf("\U0001f527 `%s`", toolName)
+	}
+
+	return fmt.Sprintf("\U0001f527 `%s`\n%s", toolName, explanation)
+}
+
+// FitToolFeedbackMessage keeps tool feedback within a single outbound message.
+// It preserves the first line when possible and truncates the explanation body
+// instead of letting the message be split into multiple chunks.
+func FitToolFeedbackMessage(content string, maxLen int) string {
+	content = strings.TrimSpace(content)
+	if content == "" || maxLen <= 0 {
+		return ""
+	}
+	if len([]rune(content)) <= maxLen {
+		return content
+	}
+
+	firstLine, rest, hasRest := strings.Cut(content, "\n")
+	firstLine = strings.TrimSpace(firstLine)
+	rest = strings.TrimSpace(rest)
+
+	if !hasRest || rest == "" {
+		return Truncate(firstLine, maxLen)
+	}
+
+	if len([]rune(firstLine)) >= maxLen {
+		return Truncate(firstLine, maxLen)
+	}
+
+	remaining := maxLen - len([]rune(firstLine)) - 1
+	if remaining <= 0 {
+		return Truncate(firstLine, maxLen)
+	}
+
+	return firstLine + "\n" + Truncate(rest, remaining)
 }

pkg/utils/tool_feedback_test.go

@@ -3,9 +3,47 @@ package utils
 import "testing"
 
 func TestFormatToolFeedbackMessage(t *testing.T) {
-	got := FormatToolFeedbackMessage("read_file", "{\"path\":\"README.md\"}")
+	got := FormatToolFeedbackMessage(
-	want := "\U0001f527 `read_file`\n```\n{\"path\":\"README.md\"}\n```"
+		"read_file",
+		"I will read README.md first to confirm the current project structure.",
+	)
+	want := "\U0001f527 `read_file`\nI will read README.md first to confirm the current project structure."
 	if got != want {
 		t.Fatalf("FormatToolFeedbackMessage() = %q, want %q", got, want)
 	}
 }
+
+func TestFormatToolFeedbackMessage_EmptyExplanationKeepsOnlyToolLine(t *testing.T) {
+	got := FormatToolFeedbackMessage("read_file", "")
+	want := "\U0001f527 `read_file`"
+	if got != want {
+		t.Fatalf("FormatToolFeedbackMessage() = %q, want %q", got, want)
+	}
+}
+
+func TestFormatToolFeedbackMessage_EmptyToolNameOmitsToolLine(t *testing.T) {
+	got := FormatToolFeedbackMessage("", "Continue drafting the final response.")
+	want := "Continue drafting the final response."
+	if got != want {
+		t.Fatalf("FormatToolFeedbackMessage() = %q, want %q", got, want)
+	}
+}
+
+func TestFitToolFeedbackMessage_TruncatesBodyWithinSingleMessage(t *testing.T) {
+	got := FitToolFeedbackMessage(
+		"\U0001f527 `read_file`\nRead README.md first to confirm the current project structure.",
+		40,
+	)
+	want := "\U0001f527 `read_file`\nRead README.md first to..."
+	if got != want {
+		t.Fatalf("FitToolFeedbackMessage() = %q, want %q", got, want)
+	}
+}
+
+func TestFitToolFeedbackMessage_TruncatesSingleLineMessage(t *testing.T) {
+	got := FitToolFeedbackMessage("\U0001f527 `read_file`", 10)
+	want := "\U0001f527 `read..."
+	if got != want {
+		t.Fatalf("FitToolFeedbackMessage() = %q, want %q", got, want)
+	}
+}

web/backend/api/pico.go

@@ -233,6 +233,10 @@ func (h *Handler) handleRegenPicoToken(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	gateway.mu.Lock()
+	gateway.picoToken = token
+	gateway.mu.Unlock()
+
 	h.writePicoInfoResponse(w, r, cfg, nil)
 }
 

web/backend/api/pico_test.go

@@ -393,6 +393,58 @@ func TestHandleGetPicoInfo_OmitsToken(t *testing.T) {
 	}
 }
 
+func TestHandleRegenPicoToken_RefreshesGatewayTokenCache(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "config.json")
+	h := NewHandler(configPath)
+
+	if _, err := h.EnsurePicoChannel(); err != nil {
+		t.Fatalf("EnsurePicoChannel() error = %v", err)
+	}
+
+	origPicoToken := gateway.picoToken
+	t.Cleanup(func() {
+		gateway.mu.Lock()
+		gateway.picoToken = origPicoToken
+		gateway.mu.Unlock()
+	})
+
+	gateway.mu.Lock()
+	gateway.picoToken = "stale-token"
+	gateway.mu.Unlock()
+
+	req := httptest.NewRequest(http.MethodPost, "http://launcher.local/api/pico/token", nil)
+	rec := httptest.NewRecorder()
+	h.handleRegenPicoToken(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
+	}
+
+	cfg, err := config.LoadConfig(configPath)
+	if err != nil {
+		t.Fatalf("LoadConfig() error = %v", err)
+	}
+
+	bc := cfg.Channels["pico"]
+	decoded, err := bc.GetDecoded()
+	if err != nil {
+		t.Fatalf("GetDecoded() error = %v", err)
+	}
+	token := decoded.(*config.PicoSettings).Token.String()
+	if token == "" {
+		t.Fatal("expected regenerated pico token to be persisted")
+	}
+	if token == "stale-token" {
+		t.Fatal("expected regenerated pico token to differ from stale cache")
+	}
+
+	gateway.mu.Lock()
+	defer gateway.mu.Unlock()
+	if gateway.picoToken != token {
+		t.Fatalf("gateway.picoToken = %q, want %q", gateway.picoToken, token)
+	}
+}
+
 func TestHandleWebSocketProxyReloadsGatewayTargetFromConfig(t *testing.T) {
 	origMatcher := gatewayProcessMatcher
 	gatewayProcessMatcher = func(int) (bool, bool) { return true, true }

web/backend/api/session.go

@@ -510,6 +510,16 @@ func visibleSessionMessages(messages []providers.Message, toolFeedbackMaxArgsLen
 				transcript = append(transcript, visibleToolMessages...)
 			}
 
+			// When assistant content exactly matches the rendered tool summary or
+			// tool-delivered message, skip it to avoid duplicates. Distinct content
+			// must remain visible in restored session history.
+			if len(msg.ToolCalls) > 0 &&
+				len(msg.Media) == 0 &&
+				len(attachments) == 0 &&
+				assistantToolCallContentDuplicated(msg.Content, toolSummaryMessages, visibleToolMessages) {
+				continue
+			}
+
 			// Pico web chat can persist both visible `message` tool output and a
 			// later plain assistant reply in the same turn. Hide only the fixed
 			// internal summary that marks handled tool delivery.
@@ -549,6 +559,43 @@ func filterSessionChatMessages(messages []sessionChatMessage) []sessionChatMessa
 	return filtered
 }
 
+func assistantToolCallContentDuplicated(
+	content string,
+	toolSummaryMessages []sessionChatMessage,
+	visibleToolMessages []sessionChatMessage,
+) bool {
+	content = strings.TrimSpace(content)
+	if content == "" {
+		return false
+	}
+
+	for _, msg := range toolSummaryMessages {
+		if toolSummaryContainsContent(msg.Content, content) {
+			return true
+		}
+	}
+	for _, msg := range visibleToolMessages {
+		if strings.TrimSpace(msg.Content) == content {
+			return true
+		}
+	}
+	return false
+}
+
+func toolSummaryContainsContent(summary, content string) bool {
+	summary = strings.TrimSpace(summary)
+	content = strings.TrimSpace(content)
+	if summary == "" || content == "" {
+		return false
+	}
+	if summary == content {
+		return true
+	}
+
+	_, body, hasBody := strings.Cut(summary, "\n")
+	return hasBody && strings.TrimSpace(body) == content
+}
+
 func sessionAttachments(msg providers.Message) []sessionChatAttachment {
 	if len(msg.Attachments) == 0 {
 		return nil
@@ -663,20 +710,41 @@ func visibleAssistantToolSummaryMessages(
 			}
 		}
 
-		argsPreview := strings.TrimSpace(argsJSON)
-		if argsPreview == "" {
-			argsPreview = "{}"
-		}
-
 		messages = append(messages, sessionChatMessage{
 			Role: "assistant",
-			Content: utils.FormatToolFeedbackMessage(name, utils.Truncate(argsPreview, toolFeedbackMaxArgsLength)),
+			Content: utils.FormatToolFeedbackMessage(
+				name,
+				visibleAssistantToolSummaryText(tc, toolFeedbackMaxArgsLength),
+			),
 		})
 	}
 
 	return messages
 }
 
+func visibleAssistantToolSummaryText(
+	tc providers.ToolCall,
+	toolFeedbackMaxArgsLength int,
+) string {
+	if tc.ExtraContent != nil {
+		if explanation := strings.TrimSpace(tc.ExtraContent.ToolFeedbackExplanation); explanation != "" {
+			return utils.Truncate(explanation, toolFeedbackMaxArgsLength)
+		}
+	}
+
+	argsJSON := ""
+	if tc.Function != nil {
+		argsJSON = tc.Function.Arguments
+	}
+	if strings.TrimSpace(argsJSON) == "" && len(tc.Arguments) > 0 {
+		if encodedArgs, err := json.Marshal(tc.Arguments); err == nil {
+			argsJSON = string(encodedArgs)
+		}
+	}
+
+	return utils.Truncate(strings.TrimSpace(argsJSON), toolFeedbackMaxArgsLength)
+}
+
 func visibleAssistantToolMessages(toolCalls []providers.ToolCall) []sessionChatMessage {
 	if len(toolCalls) == 0 {
 		return nil

web/backend/api/session_test.go

@@ -675,7 +675,7 @@ func TestHandleListSessions_MessageCountUsesVisibleTranscript(t *testing.T) {
 	}
 }
 
-func TestHandleGetSession_PreservesToolSummaryAndAssistantContent(t *testing.T) {
+func TestHandleGetSession_DoesNotDuplicateAssistantToolCallContent(t *testing.T) {
 	configPath, cleanup := setupOAuthTestEnv(t)
 	defer cleanup()
 
@@ -690,7 +690,7 @@ func TestHandleGetSession_PreservesToolSummaryAndAssistantContent(t *testing.T)
 		{Role: "user", Content: "check file"},
 		{
 			Role:    "assistant",
-			Content: "model final reply",
+			Content: "Read the file before replying.",
 			ToolCalls: []providers.ToolCall{
 				{
 					ID:   "call_1",
@@ -699,6 +699,9 @@ func TestHandleGetSession_PreservesToolSummaryAndAssistantContent(t *testing.T)
 						Name:      "read_file",
 						Arguments: `{"path":"README.md","start_line":1,"end_line":10}`,
 					},
+					ExtraContent: &providers.ExtraContent{
+						ToolFeedbackExplanation: "Read the file before replying.",
+					},
 				},
 			},
 		},
@@ -730,8 +733,8 @@ func TestHandleGetSession_PreservesToolSummaryAndAssistantContent(t *testing.T)
 	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
 		t.Fatalf("Unmarshal() error = %v", err)
 	}
-	if len(resp.Messages) != 3 {
+	if len(resp.Messages) != 2 {
-		t.Fatalf("len(resp.Messages) = %d, want 3", len(resp.Messages))
+		t.Fatalf("len(resp.Messages) = %d, want 2", len(resp.Messages))
 	}
 	if resp.Messages[0].Role != "user" || resp.Messages[0].Content != "check file" {
 		t.Fatalf("first message = %#v, want user/check file", resp.Messages[0])
@@ -739,8 +742,153 @@ func TestHandleGetSession_PreservesToolSummaryAndAssistantContent(t *testing.T)
 	if !strings.Contains(resp.Messages[1].Content, "`read_file`") {
 		t.Fatalf("tool summary message = %#v, want read_file summary", resp.Messages[1])
 	}
-	if resp.Messages[2].Role != "assistant" || resp.Messages[2].Content != "model final reply" {
+	if !strings.Contains(resp.Messages[1].Content, "Read the file before replying.") {
-		t.Fatalf("assistant message = %#v, want model final reply", resp.Messages[2])
+		t.Fatalf("tool summary message = %#v, want tool explanation", resp.Messages[1])
+	}
+}
+
+func TestHandleGetSession_PreservesDistinctAssistantToolCallContent(t *testing.T) {
+	configPath, cleanup := setupOAuthTestEnv(t)
+	defer cleanup()
+
+	dir := sessionsTestDir(t, configPath)
+	store, err := memory.NewJSONLStore(dir)
+	if err != nil {
+		t.Fatalf("NewJSONLStore() error = %v", err)
+	}
+
+	sessionKey := picoSessionPrefix + "detail-tool-summary-distinct-content"
+	for _, msg := range []providers.Message{
+		{Role: "user", Content: "check file"},
+		{
+			Role:    "assistant",
+			Content: "I will summarize the findings after reading the file.",
+			ToolCalls: []providers.ToolCall{
+				{
+					ID:   "call_1",
+					Type: "function",
+					Function: &providers.FunctionCall{
+						Name:      "read_file",
+						Arguments: `{"path":"README.md","start_line":1,"end_line":10}`,
+					},
+					ExtraContent: &providers.ExtraContent{
+						ToolFeedbackExplanation: "Read the file before replying.",
+					},
+				},
+			},
+		},
+	} {
+		if err := store.AddFullMessage(nil, sessionKey, msg); err != nil {
+			t.Fatalf("AddFullMessage() error = %v", err)
+		}
+	}
+
+	h := NewHandler(configPath)
+	mux := http.NewServeMux()
+	h.RegisterRoutes(mux)
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/api/sessions/detail-tool-summary-distinct-content", nil)
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want %d, body=%s", rec.Code, http.StatusOK, rec.Body.String())
+	}
+
+	var resp struct {
+		Messages []struct {
+			Role    string `json:"role"`
+			Content string `json:"content"`
+		} `json:"messages"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+	if len(resp.Messages) != 3 {
+		t.Fatalf("len(resp.Messages) = %d, want 3", len(resp.Messages))
+	}
+	if !strings.Contains(resp.Messages[1].Content, "`read_file`") {
+		t.Fatalf("tool summary message = %#v, want read_file summary", resp.Messages[1])
+	}
+	if resp.Messages[2].Role != "assistant" ||
+		resp.Messages[2].Content != "I will summarize the findings after reading the file." {
+		t.Fatalf("assistant content = %#v, want preserved distinct content", resp.Messages[2])
+	}
+}
+
+func TestHandleGetSession_PreservesMediaWhenAssistantToolCallContentDuplicatesSummary(t *testing.T) {
+	configPath, cleanup := setupOAuthTestEnv(t)
+	defer cleanup()
+
+	dir := sessionsTestDir(t, configPath)
+	store, err := memory.NewJSONLStore(dir)
+	if err != nil {
+		t.Fatalf("NewJSONLStore() error = %v", err)
+	}
+
+	sessionKey := picoSessionPrefix + "detail-tool-summary-duplicate-content-with-media"
+	for _, msg := range []providers.Message{
+		{Role: "user", Content: "check screenshot"},
+		{
+			Role:    "assistant",
+			Content: "Reviewing the generated screenshot.",
+			Media:   []string{"data:image/png;base64,abc123"},
+			ToolCalls: []providers.ToolCall{
+				{
+					ID:   "call_1",
+					Type: "function",
+					Function: &providers.FunctionCall{
+						Name:      "view_image",
+						Arguments: `{"path":"artifact.png"}`,
+					},
+					ExtraContent: &providers.ExtraContent{
+						ToolFeedbackExplanation: "Reviewing the generated screenshot.",
+					},
+				},
+			},
+		},
+	} {
+		if err := store.AddFullMessage(nil, sessionKey, msg); err != nil {
+			t.Fatalf("AddFullMessage() error = %v", err)
+		}
+	}
+
+	h := NewHandler(configPath)
+	mux := http.NewServeMux()
+	h.RegisterRoutes(mux)
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/api/sessions/detail-tool-summary-duplicate-content-with-media", nil)
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want %d, body=%s", rec.Code, http.StatusOK, rec.Body.String())
+	}
+
+	var resp struct {
+		Messages []struct {
+			Role    string   `json:"role"`
+			Content string   `json:"content"`
+			Media   []string `json:"media"`
+		} `json:"messages"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+	if len(resp.Messages) != 3 {
+		t.Fatalf("len(resp.Messages) = %d, want 3", len(resp.Messages))
+	}
+	if !strings.Contains(resp.Messages[1].Content, "`view_image`") {
+		t.Fatalf("tool summary message = %#v, want view_image summary", resp.Messages[1])
+	}
+	if resp.Messages[2].Role != "assistant" {
+		t.Fatalf("assistant message role = %q, want assistant", resp.Messages[2].Role)
+	}
+	if resp.Messages[2].Content != "Reviewing the generated screenshot." {
+		t.Fatalf("assistant content = %q, want preserved duplicated content with media", resp.Messages[2].Content)
+	}
+	if len(resp.Messages[2].Media) != 1 || resp.Messages[2].Media[0] != "data:image/png;base64,abc123" {
+		t.Fatalf("assistant media = %#v, want preserved media", resp.Messages[2].Media)
 	}
 	for _, msg := range resp.Messages {
 		if msg.Role == "tool" || strings.Contains(msg.Content, "raw read_file result") {
@@ -749,6 +897,90 @@ func TestHandleGetSession_PreservesToolSummaryAndAssistantContent(t *testing.T)
 	}
 }
 
+func TestHandleGetSession_PreservesAttachmentsWhenAssistantToolCallContentDuplicatesSummary(t *testing.T) {
+	configPath, cleanup := setupOAuthTestEnv(t)
+	defer cleanup()
+
+	dir := sessionsTestDir(t, configPath)
+	store, err := memory.NewJSONLStore(dir)
+	if err != nil {
+		t.Fatalf("NewJSONLStore() error = %v", err)
+	}
+
+	sessionKey := picoSessionPrefix + "detail-tool-summary-duplicate-content-with-attachments"
+	for _, msg := range []providers.Message{
+		{Role: "user", Content: "check report"},
+		{
+			Role:    "assistant",
+			Content: "Reviewing the generated report.",
+			Attachments: []providers.Attachment{{
+				Type:        "file",
+				URL:         "https://example.com/report.txt",
+				Filename:    "report.txt",
+				ContentType: "text/plain",
+			}},
+			ToolCalls: []providers.ToolCall{
+				{
+					ID:   "call_1",
+					Type: "function",
+					Function: &providers.FunctionCall{
+						Name:      "read_file",
+						Arguments: `{"path":"report.txt"}`,
+					},
+					ExtraContent: &providers.ExtraContent{
+						ToolFeedbackExplanation: "Reviewing the generated report.",
+					},
+				},
+			},
+		},
+	} {
+		if err := store.AddFullMessage(nil, sessionKey, msg); err != nil {
+			t.Fatalf("AddFullMessage() error = %v", err)
+		}
+	}
+
+	h := NewHandler(configPath)
+	mux := http.NewServeMux()
+	h.RegisterRoutes(mux)
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(
+		http.MethodGet,
+		"/api/sessions/detail-tool-summary-duplicate-content-with-attachments",
+		nil,
+	)
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want %d, body=%s", rec.Code, http.StatusOK, rec.Body.String())
+	}
+
+	var resp struct {
+		Messages []sessionChatMessage `json:"messages"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+	if len(resp.Messages) != 3 {
+		t.Fatalf("len(resp.Messages) = %d, want 3", len(resp.Messages))
+	}
+	if !strings.Contains(resp.Messages[1].Content, "`read_file`") {
+		t.Fatalf("tool summary message = %#v, want read_file summary", resp.Messages[1])
+	}
+	if resp.Messages[2].Role != "assistant" {
+		t.Fatalf("assistant message role = %q, want assistant", resp.Messages[2].Role)
+	}
+	if resp.Messages[2].Content != "Reviewing the generated report." {
+		t.Fatalf("assistant content = %q, want preserved duplicated content", resp.Messages[2].Content)
+	}
+	if len(resp.Messages[2].Attachments) != 1 {
+		t.Fatalf("len(assistant.Attachments) = %d, want 1", len(resp.Messages[2].Attachments))
+	}
+	if resp.Messages[2].Attachments[0].URL != "https://example.com/report.txt" {
+		t.Fatalf("attachment url = %q, want report URL", resp.Messages[2].Attachments[0].URL)
+	}
+}
+
 func TestHandleGetSession_UsesConfiguredToolFeedbackMaxArgsLength(t *testing.T) {
 	configPath, cleanup := setupOAuthTestEnv(t)
 	defer cleanup()
@@ -770,6 +1002,7 @@ func TestHandleGetSession_UsesConfiguredToolFeedbackMaxArgsLength(t *testing.T)
 	}
 
 	argsJSON := `{"path":"README.md","start_line":1,"end_line":10,"extra":"abcdefghijklmnopqrstuvwxyz"}`
+	explanation := "Read README.md first to confirm the current project structure before editing the config example."
 	sessionKey := picoSessionPrefix + "detail-tool-summary-max-args"
 	err = store.AddFullMessage(nil, sessionKey, providers.Message{Role: "user", Content: "check file"})
 	if err != nil {
@@ -784,6 +1017,9 @@ func TestHandleGetSession_UsesConfiguredToolFeedbackMaxArgsLength(t *testing.T)
 				Name:      "read_file",
 				Arguments: argsJSON,
 			},
+			ExtraContent: &providers.ExtraContent{
+				ToolFeedbackExplanation: explanation,
+			},
 		}},
 	})
 	if err != nil {
@@ -816,13 +1052,93 @@ func TestHandleGetSession_UsesConfiguredToolFeedbackMaxArgsLength(t *testing.T)
 		t.Fatalf("len(resp.Messages) = %d, want at least 2", len(resp.Messages))
 	}
 
-	wantPreview := utils.Truncate(argsJSON, 20)
+	wantPreview := utils.Truncate(explanation, 20)
 	if !strings.Contains(resp.Messages[1].Content, wantPreview) {
 		t.Fatalf("tool summary = %q, want preview %q", resp.Messages[1].Content, wantPreview)
 	}
 	if strings.Contains(resp.Messages[1].Content, argsJSON) {
 		t.Fatalf("tool summary = %q, expected configured truncation", resp.Messages[1].Content)
 	}
+	if !strings.Contains(resp.Messages[1].Content, "`read_file`") {
+		t.Fatalf("tool summary = %q, want read_file summary", resp.Messages[1].Content)
+	}
+}
+
+func TestHandleGetSession_FallsBackToLegacyToolArgumentsWhenExplanationMissing(t *testing.T) {
+	configPath, cleanup := setupOAuthTestEnv(t)
+	defer cleanup()
+
+	cfg, err := config.LoadConfig(configPath)
+	if err != nil {
+		t.Fatalf("LoadConfig() error = %v", err)
+	}
+	cfg.Agents.Defaults.ToolFeedback.MaxArgsLength = 20
+	err = config.SaveConfig(configPath, cfg)
+	if err != nil {
+		t.Fatalf("SaveConfig() error = %v", err)
+	}
+
+	dir := sessionsTestDir(t, configPath)
+	store, err := memory.NewJSONLStore(dir)
+	if err != nil {
+		t.Fatalf("NewJSONLStore() error = %v", err)
+	}
+
+	argsJSON := `{"path":"README.md","start_line":1,"end_line":10,"extra":"abcdefghijklmnopqrstuvwxyz"}`
+	sessionKey := picoSessionPrefix + "detail-tool-summary-legacy-args"
+	if err := store.AddFullMessage(
+		nil,
+		sessionKey,
+		providers.Message{Role: "user", Content: "check file"},
+	); err != nil {
+		t.Fatalf("AddFullMessage(user) error = %v", err)
+	}
+	if err := store.AddFullMessage(nil, sessionKey, providers.Message{
+		Role: "assistant",
+		ToolCalls: []providers.ToolCall{{
+			ID:   "call_1",
+			Type: "function",
+			Function: &providers.FunctionCall{
+				Name:      "read_file",
+				Arguments: argsJSON,
+			},
+		}},
+	}); err != nil {
+		t.Fatalf("AddFullMessage(assistant) error = %v", err)
+	}
+
+	h := NewHandler(configPath)
+	mux := http.NewServeMux()
+	h.RegisterRoutes(mux)
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/api/sessions/detail-tool-summary-legacy-args", nil)
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want %d, body=%s", rec.Code, http.StatusOK, rec.Body.String())
+	}
+
+	var resp struct {
+		Messages []struct {
+			Role    string `json:"role"`
+			Content string `json:"content"`
+		} `json:"messages"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+	if len(resp.Messages) < 2 {
+		t.Fatalf("len(resp.Messages) = %d, want at least 2", len(resp.Messages))
+	}
+
+	wantPreview := utils.Truncate(argsJSON, 20)
+	if !strings.Contains(resp.Messages[1].Content, "`read_file`") {
+		t.Fatalf("tool summary = %q, want read_file summary", resp.Messages[1].Content)
+	}
+	if !strings.Contains(resp.Messages[1].Content, wantPreview) {
+		t.Fatalf("tool summary = %q, want legacy args preview %q", resp.Messages[1].Content, wantPreview)
+	}
 }
 
 func TestHandleGetSession_IncludesMediaOnlyMessages(t *testing.T) {

web/frontend/src/components/chat/assistant-message.tsx

@@ -100,8 +100,8 @@ export function AssistantMessage({
               className={cn(
                 "prose dark:prose-invert prose-pre:my-2 prose-pre:overflow-x-auto prose-pre:rounded-lg prose-pre:border prose-pre:bg-zinc-100 prose-pre:p-0 prose-pre:text-zinc-900 dark:prose-pre:bg-zinc-950 dark:prose-pre:text-zinc-100 max-w-none [overflow-wrap:anywhere] break-words",
                 isThought
-                  ? "prose-p:my-1.5 px-3 pt-0 pb-3 text-[13px] leading-relaxed opacity-70"
+                  ? "prose-p:my-1.5 prose-p:whitespace-pre-wrap px-3 pt-0 pb-3 text-[13px] leading-relaxed opacity-70"
-                  : "prose-p:my-2 p-4 text-[15px] leading-relaxed",
+                  : "prose-p:my-2 prose-p:whitespace-pre-wrap p-4 text-[15px] leading-relaxed",
               )}
             >
               <ReactMarkdown

web/frontend/src/features/chat/protocol.ts

@@ -4,6 +4,7 @@ import { normalizeUnixTimestamp } from "@/features/chat/state"
 import {
   type AssistantMessageKind,
   type ChatAttachment,
+  type ChatMessage,
   type ContextUsage,
   updateChatStore,
 } from "@/store/chat"
@@ -90,6 +91,35 @@ function parseContextUsage(
   }
 }
 
+function isToolFeedbackMessage(message: ChatMessage): boolean {
+  if (message.role !== "assistant") {
+    return false
+  }
+
+  const firstLine = message.content.split("\n", 1)[0]?.trim() ?? ""
+  return /^🔧\s+`[^`]+`/.test(firstLine)
+}
+
+function findToolFeedbackMessageIndex(messages: ChatMessage[]): number {
+  let lastUserIndex = -1
+  for (let i = messages.length - 1; i >= 0; i -= 1) {
+    if (messages[i].role === "user") {
+      lastUserIndex = i
+      break
+    }
+  }
+
+  for (let i = messages.length - 1; i >= 0; i -= 1) {
+    if (i <= lastUserIndex) {
+      break
+    }
+    if (isToolFeedbackMessage(messages[i])) {
+      return i
+    }
+  }
+  return -1
+}
+
 export function handlePicoMessage(
   message: PicoMessage,
   expectedSessionId: string,
@@ -138,21 +168,88 @@ export function handlePicoMessage(
       const hasKind = hasAssistantKindPayload(payload)
       const kind = parseAssistantMessageKind(payload)
       const attachments = parseAttachments(payload)
+      const contextUsage = parseContextUsage(payload)
+      const timestamp =
+        message.timestamp !== undefined &&
+        Number.isFinite(Number(message.timestamp))
+          ? normalizeUnixTimestamp(Number(message.timestamp))
+          : Date.now()
       if (!messageId) {
         break
       }
 
       updateChatStore((prev) => ({
-        messages: prev.messages.map((msg) =>
+        messages: (() => {
-          msg.id === messageId
+          let found = false
+          const messages = prev.messages.map((msg) => {
+            if (msg.id !== messageId) {
+              return msg
+            }
+            found = true
+            return {
+              ...msg,
+              id: messageId,
+              content,
+              ...(hasKind ? { kind } : {}),
+              ...(attachments ? { attachments } : {}),
+            }
+          })
+          if (found) {
+            return messages
+          }
+
+          const fallbackIndex = findToolFeedbackMessageIndex(messages)
+          if (fallbackIndex >= 0) {
+            return messages.map((msg, index) =>
+              index === fallbackIndex
                 ? {
                     ...msg,
+                    id: messageId,
                     content,
                     ...(hasKind ? { kind } : {}),
                     ...(attachments ? { attachments } : {}),
                   }
                 : msg,
-        ),
+            )
+          }
+
+          return [
+            ...messages,
+            {
+              id: messageId,
+              role: "assistant" as const,
+              content,
+              ...(hasKind ? { kind } : {}),
+              ...(attachments ? { attachments } : {}),
+              timestamp,
+            },
+          ]
+        })(),
+        ...(contextUsage ? { contextUsage } : {}),
+      }))
+      break
+    }
+
+    case "message.delete": {
+      const messageId = payload.message_id as string
+      if (!messageId) {
+        break
+      }
+
+      updateChatStore((prev) => ({
+        messages: (() => {
+          const exactMessages = prev.messages.filter((msg) => msg.id !== messageId)
+          if (exactMessages.length !== prev.messages.length) {
+            return exactMessages
+          }
+
+          const fallbackIndex = findToolFeedbackMessageIndex(prev.messages)
+          if (fallbackIndex < 0) {
+            return prev.messages
+          }
+
+          return prev.messages.filter((_, index) => index !== fallbackIndex)
+        })(),
       }))
       break
     }

web/frontend/src/i18n/locales/en.json

@@ -605,9 +605,9 @@
       "split_on_marker": "Chatty Mode",
       "split_on_marker_hint": "Split long messages into short ones like real human chatting.",
       "tool_feedback_enabled": "Tool Feedback",
-      "tool_feedback_enabled_hint": "Send a short tool-call preview into the current chat before each tool execution.",
+      "tool_feedback_enabled_hint": "Send a short execution note into the current chat before each tool runs.",
-      "tool_feedback_max_args_length": "Tool Feedback Args Preview Length",
+      "tool_feedback_max_args_length": "Tool Feedback Length",
-      "tool_feedback_max_args_length_hint": "Maximum number of argument characters shown in each tool feedback message. Set to 0 to use the default.",
+      "tool_feedback_max_args_length_hint": "Maximum number of characters shown in each tool feedback message. Set to 0 to use the default.",
       "exec_enabled": "Allow Commands",
       "exec_enabled_hint": "Enable or disable command execution for the app. When disabled, no command requests will run.",
       "allow_remote": "Allow Remote Commands",

web/frontend/src/i18n/locales/zh.json

@@ -605,9 +605,9 @@
       "split_on_marker": "连续短消息",
       "split_on_marker_hint": "像真人聊天一样，把长难句拆成多条短消息快速发出",
       "tool_feedback_enabled": "工具反馈",
-      "tool_feedback_enabled_hint": "在每次执行工具前，先向当前会话发送一条简短的工具调用预览",
+      "tool_feedback_enabled_hint": "在每次执行工具前，先向当前会话发送一条简短的执行说明",
-      "tool_feedback_max_args_length": "工具反馈参数预览长度",
+      "tool_feedback_max_args_length": "工具反馈长度",
-      "tool_feedback_max_args_length_hint": "每条工具反馈消息中展示的参数字符上限。设为 0 时使用默认值",
+      "tool_feedback_max_args_length_hint": "每条工具反馈消息中展示的字符上限。设为 0 时使用默认值",
       "exec_enabled": "允许命令执行",
       "exec_enabled_hint": "控制应用是否允许执行命令。关闭后，所有命令请求都不会执行",
       "allow_remote": "允许远程命令执行",